| Brand |
Model |
CHASSIS |
Keyword |
SYMPTOM |
CURE |
| Zen |
SR2738RK |
C11 |
arcing |
SR2738RK 581-46173214 Unit is arcing in the neck and caused the main deflection to
fail. |
CRT
A68AGD00XX is defective also the main board Note: It has been
discovered the cause of the arcing has been attributed to the Dag coating
coming off inside the picture tube. This coating is conductive and if it
migrates to the neck off the tube it will cause cause arcing back through the
low level video drive circuits. |
| ZEN |
SL2722LK |
C2 |
arcing |
SL2722LK 381-22302030 The television was dead but when the tech installed the Main
deflection board the Tube violently arced over and took out the Main module
again |
.Tech
will need to replace the main module and the CRT A68ACT00X Note: It has been discovered the
cause of the arcing has been attributed to the Dag coating coming off inside
the picture tube. This coating is conductive and if it migrates to the neck
off the tube it will cause cause arcing back through the low level video
drive circuits. |
| ZEN |
SL2722RK |
C2 |
arcing |
SL2722LK
Arcing in the Neck of CRT at turn on. Also no green |
Whit
the arcing symptom it will be necessary to replace the CRT A68ACT00X Note: It has been discovered the cause of the arcing has been
attributed to the Dag coating coming off inside the picture tube. This
coating is conductive and if it migrates to the neck off the tube it will
cause cause arcing back through the low level video drive circuits. |
| ZEN |
Z27X22D |
GZ |
arcing |
Z27X22D
721-45467024. Unit has an arcing in
the neck of the CRT. Shorted the video output drivers. |
Unit
will need the CRT A68AGD02X ----Note: It has been discovered the cause of the
arcing has been attributed to the Dag coating coming off inside the picture
tube. This coating is conductive and if it migrates to the neck off the tube
it will cause cause arcing back through the low level video drive circuits. |
| Zenith |
SD2789 |
B3 |
Audio |
SD2769
. Unit has audio but audio gets distorted when the volume is in the higher
range. Seems to mute the audio on voice peaks Power supply voltage |
Problem
not in audio circuit, problem in Power Supply module. Replace Power supply
and restored normal operation. I was able to help Shop tech on the repair of
this unit. It is a 1983 model television. Unit had power supply defect
causing the 26 vdc supply to be only 11 vdc. The tech needs to check the
filter capacitors in the stand by power supply. |
| Zenith |
SD2789 |
B3 |
Audio |
SD2769
. Unit has audio but audio gets distorted when the volume is in the higher
range. Seems to mute the audio on voice peaks Power supply voltage |
Problem
not in audio circuit, problem in Power Supply module. Replace Power supply
and restored normal operation. I was able to help Shop tech on the repair of
this unit. It is a 1983 model television. Unit had power supply defect
causing the 26 vdc supply to be only 11 vdc. The tech needs to check the
filter capacitors in the stand by power supply. |
| Zenith |
A25A11D |
GA |
Audio |
Unit
has low audio when adjusted to max volume |
replace
r833 and R853 with 1.2k ohms |
| Zenith |
A27A12D |
GA |
Audio |
Unit
has low audio when adjusted to max volume |
replace r833 and R853 with 1.2k ohms |
| Zenith |
Z20A21D |
GA |
Audio |
Zenith
Z20A21D. Unit has no audio. All boards are repair only items. Boards must be
serviced to component level. |
Unit
has several problems in the configuration mode. Level was set to 1 when it
should be at 2. Also 25 C Type of chassis was at 0 when it should have been
at 5. Resetting the parameters corrected the fault. |
| Zenith |
Z20A21D |
GA |
Audio |
Zenith
Z20A21D. Unit has no audio. All boards are repair only items. Boards must be
serviced to component level. |
Unit
has several problems in the configuration mode. Level was set to 1 when it
should be at 2. Also 25 C Type of chassis was at 0 when it should have been
at 5. Resetting the parameters corrected the fault. |
| Zenith |
Z25A02G |
GA |
Audio |
Zenith
Z25A02G serial # 821-23020089. Unit has raspy buzz in audio when receiving
specific television stations |
Buzz
or impulse noise is coincident to the VITS/VIR signals that are broadcast in
the vertical blanking interval. At the instant of the impulse noise there is
a pulse on or near Line 17 ~ 21 of the composite video measured at Q1203(E)
The problem was C121 |
| Zenith |
Z25A11S |
GA |
Audio |
Customer
complained about the low level audio from speakers. Cannot get high enough
audio from set. |
I
had tech get into alignment parameter 14 and increase level from 42 to 58.
This is used for the composite audio level adjustment. The audio output is
only 1 watt per channel, not a power house. It should not be expected to have
a big sound from these low output devices. |
| Zenith |
SY2588S |
GX |
Audio |
Unit
has intermittent audio loss in 1 channel. |
Recommend
to replace the audio MTS decoder board. Replacement of the MTS board
corrected fault. PN# 9-1589-01. |
| Zenith |
H3241DT |
GXC |
Auxillery
Inputs |
Computer
input not working |
make
sure that plug 9P4 is plugged into scan converter Circuit board and not the
R.F. module check service menu item 14 is set to 1 |
| Zenith |
IQB56W10G |
ND-991A |
Auxillery
Inputs |
When
using a DVD player the customer may complain of a ghosting on trailing edges
of some items |
Tech
needs to enter the service mode and change the change C-trap to 0 |
| Zenith |
IQB64W10W, |
ND-991A |
Auxillery
Inputs |
When
using a DVD player the customer may complain of a ghosting on trailing edges
of some items |
Tech
needs to enter the service mode and change the change C-trap to 0 |
| Zenith |
A27B35W |
GA2 |
Bright
screen |
Unit
has bright screen with retrace lines. Unit only has 56 volts at the cathode
of the CRT. Monitoring the voltage at CX3296(+) we found only 61 volts. |
Checking
the source of the 200 vdc B+ we found
that R3277 a 2.2 1/2 watt ohm resistor was open. It was replaced where it
promptly open even though ther was no apparent shorts on it's cathode. Diode DX3287 pn# 103-326A was replaced
even when it checked good, along with the resistor and everything was
restored to normal. |
| Zenith |
PV4663RK |
C8 |
Colored Spots |
PV4663RK…yellow
spot on lower right hand side of screen. Tubes changed earlier in year for
same trouble |
Tech
wondering what else would cause this defect. I asked if any video games are
played on this TV. Yes there is. Removal of screen and viewing inside lens of
CRT shows a burned square in the blue CRT. |
| Zenith |
PV4663RK |
C8 |
Colored
Spots |
PV4663RK…yellow
spot on lower right hand side of screen. Tubes changed earlier in year for
same trouble |
Tech
wondering what else would cause this defect. I asked if any video games are
played on this TV. Yes there is. Removal of screen and viewing inside lens of
CRT shows a burned square in the blue CRT. |
| Zenith |
PVR4663RK |
C8 |
convergence |
This
television has no convergence
correction. Missing 16vdc at connector
7C3 pin 6. |
replace RX3210(open) and CR3206 ( shorted) |
| Zenith |
PVR4663RK |
C8 |
convergence |
This
television has no convergence correction. Missing 16vdc at connector 7C3 pin
6. |
replace
RX3210(open) and CR3206 ( shorted) |
| Zen |
A56M91W |
GZ |
convergence |
Unit
has slight convevergence mis alingnment. Tech calling in to find out how to get into the dynamic convergence
alignment mode. |
Tech
needs to hold the menu button down and when the screen changes after 4 to 6
second press 9999 the Enter. It will now be in the Dynamic Convergence setup
mode. |
| Zenith |
PVY5265 |
GZ |
convergence |
Dark
Raster, top looks like rainbow.no video, no OSD, slick raster with three (R,
G, B) bowed lines across the top of screen. |
open
resistor, R3243 (100k, 1/2w) located just behind the HOT, under a larger
power resistor. |
| Zenith |
PVY5265 |
GZ |
convergence |
Dark
Raster, top looks like rainbow.no video, no OSD, slick raster with three (R,
G, B) bowed lines across the top of screen. |
open
resistor, R3243 (100k, 1/2w) located just behind the HOT, under a larger
power resistor. |
| ZEN |
Z60Z83D |
GZ |
convergence |
Z60Z83D
781-16351245 Unit was way out of conergence. Replacing the Converrgence
output & Convergence power supply
module did not correct the symptom. Instead R4163 & R4160 burned open
again. |
R4163
and R4160 are burned. These resistors are in the B+ supply for the
convergence output supply. An over current situation must have occurred in
order to burn these devices out. Since the convergence output board and convergence power supply
are new, and the new resistors are burning up the only thing that makes sence
is that one of the sub deflection yokes (convergence yokes) may be damaged
causing this over current situation to exhist. Suggest the tech measure the
DC resistance of all the windings in the sub deflection circuit. All like
windings should measure the same exact resistance. All vertical windings
should measure the same and so should the horizontal. |
| Zen |
Z60Z83D |
GZ |
convergence |
Z60Z83D
Unit was dead until the 9-1674 was replaced now the unit operates
put has a east/west convergence error. |
Suggest the tech |
| Zenith |
PVY5265 |
GZP |
convergence |
Tech
changed main module and now has to completely adjust convergence and other
adjustment on chassis |
Tech
looking for a quicker way to do these adjustments. Recommend the tech remove
the CPU and EPROM module from board assembly and install the old original CPU
and EPROM on main module. The memory is still retained in the old EPROM and
can be easily transferred by removing old the microprocessor board and
installing it to the new board. |
| Zen |
PVY5265 |
GZ |
CRT
leaking |
Blue
CRT leaking coolant on main deflection board |
Unit
will need replacement Blue CRT and main circuit board |
| Zenith |
H3246DT |
CS |
cycling
on an off |
Unit
would cycle on/off for 15 min or so and stay for the rest of the day. This
symptom would only occur when set was cold. |
Replace C4103 with a 22-07759-30 |
| Zenith |
H3246DT |
CS |
cycling
on an off |
Unit
would cycle on/off for 15 min or so and stay for the rest of the day. This
symptom would only occur when set was cold. |
Replace
C4103 with a 22-07759-30 |
| ZEN |
SMS1935S |
C6 |
dead |
SMS1935S. Unit is dead. Main module has shorted
Horizontal output transistor. |
Suggest
the Main board be replaced … 009-01244 |
| Zenith |
PVR4660 |
C8 |
Dead |
Unit
is dead. Deflection board 9-1302-07 is burned around the fllyback transformer
area. |
The
tech will have to replace the flyback or board. It is more economical to
replace the deflection board assembly. |
| Zenith |
PVR4660 |
C8 |
Dead |
Unit
is dead. Deflection board 9-1302-07 is burned around the fllyback transformer
area. |
The
tech will have to replace the flyback or board. It is more economical to
replace the deflection board assembly. |
| ZEN |
IQ3557CC |
GX |
dead |
IQ3557CC.
Unit is dead |
Needs
the power deflection module. 9-1673-01 |
| Zenith |
SY2768 |
GX |
Dead |
Dead
set! Fuse FX3402 open or opens when main module is replaced. |
On
jack pack look for a shorted IC804 check between pin 9 and ground if
resistance is low or 0 ohms replace IC804 |
| ZEN |
Z32X31D |
GX |
Dead |
Unit
has no life at all. We have had several of these all having no power / no
click from the ON/OFF relay or the Degausing Relay
|
Using
STR53041 Regulator Always replace: CX3413 =
22mf 63V, CX3416 = 100mf,
25V, RX3404 180k (use 1/2W). Also check: RX3407 = 47 ohm,1W, Rx3408 22 ohm, 1/2W
QX3401 121-1348 (use ECG184 or one of
many other transistors with similar spec's listed in the ECG guide under
TO-220 and TO-220J case styles 4 only (A 1Amp rating is required). If that
doesn't do it replace ICX3431 - STR53041. |
| Zenith |
Z36X31D |
GX |
Dead |
Zenith
SY2518RK. Unit was dead. Tech replace the main module, a 9-1584 and now has
no audio |
This
module will not allow the tech to change the level settings to Level (2) when
the Factory mode is turned on and the Jumper is on 4G3 pins 3 and 4. This
chassis requires the module to be set to Level (2) |
| Zenith |
Z36X31D |
GX |
Dead |
Zenith
SY2518RK. Unit was dead. Tech replace the main module, a 9-1584 and now has
no audio |
This
module will not allow the tech to change the level settings to Level (2) when
the Factory mode is turned on and the Jumper is on 4G3 pins 3 and 4. This
chassis requires the module to be set to Level (2) |
| ZEN |
Z32X31D |
GZ |
Dead |
NO RELAY CLICK. Checking RX3407= 47-1W, RX3408= 22-1/2W, QX3401= 121-1348 all defective |
Suggest
also replacing CX3413(22/63V), CX3416(100/25V), RX3404(180K-1/2W) along with
the regulator STR53041 |
| ZEN |
SM2789BT |
C8 |
Focus |
SM2789BT8
serial 421-00327074 Blurry picture when adjusting the focus the brightness
will fluctuate |
Unit
has defective CRT A68ADG00XX |
| Zenith |
PV4660VK |
C8 |
Horizontal smear |
Projection
Television. Unit has red and blue horizontal smear Like a comet tail. CRT's
replace just less than 1 year ago which corrected the fault. |
Appears
the tubes may be bad again. Unit runs about 18 hours a day every day. This
puts a lot hours on these tubes. These tubes will run about 2000 hours then
begin burning phosphor, and requiring more drive to produce the same amount
of light. As long as the G2 voltage maintains the same voltage throughout the
tube life, the flare should not occur This is not an unusual situation |
| Zenith |
PV4660VK |
C8 |
Horizontal
smear |
Projection
Television. Unit has red and blue horizontal smear Like a comet tail. CRT's
replace just less than 1 year ago which corrected the fault. |
Appears
the tubes may be bad again. Unit runs about 18 hours a day every day. This
puts a lot hours on these tubes. These tubes will run about 2000 hours then
begin burning phosphor, and requiring more drive to produce the same amount
of light. As long as the G2 voltage maintains the same voltage throughout the
tube life, the flare should not occur This is not an unusual situation |
| Zenith |
PVY4665RK |
GZ |
menu |
PVY4665RK.
After setting the convergence the "STAR" button was hit
accidentally instead of "QUIT" . Once this was done tech could not
get into the tech menu to set convergence again. All normal key entries do
not gain access to the convergence |
In
order for the tech to gain access t the tech menu again the tech must push
"SURF", "TV", "QUIT". Then access can be made
to gain access to the tech menu through normal means. |
| Zenith |
PVY4665RK |
GZP |
menu |
PVY4665RK.
After setting the convergence the "STAR" button was hit
accidentally instead of "QUIT" . Once this was done tech could not
get into the tech menu to set convergence again. All normal key entries do
not gain access to the convergence |
In
order for the tech to gain access t the tech menu again the tech must push
"SURF", "TV", "QUIT". Then access can be made
to gain access to the tech menu through normal means. |
| ZEN |
SM2722RK |
C10 |
Missing
color |
SM2722RK
serial 481-22515088. Unit has no green Shorting all three CRT cathodes will
not achieve a black and white picture |
TV
needs replacement CRT A68ACT00X |
| Zen |
SS2733LK |
C11 |
Missing
color |
SS2733LK
481-23081115 Unit will not produce blue on the CRT face place. Jumping all
three CRT cathodes together will not achieve a B/W picture Just a pink
picture. |
Unit
has a defective CRT A68ACT00X |
| ZEN |
SJ2722LK |
C2 |
Missing
color |
SJ2722LK5
serial 381-16091450 Unit has no blue on the CRT face place. Jumping all three
CRT cathodes together will not achieve a B/W picture |
This
set has a defective CRT ….A68ACT07X |
| Zen |
SL2743LK |
C8 |
Missing
color |
SL2743LK
no serial . Unit has no Blue or red. Also the tube is dark |
Checking
the cathodes of the Set will need a new CRT A68ADG00XX |
| Zenith |
ZB2797P |
Digital |
no
audio no video |
no
audio or video, normal raster also you can view the customer's menu but
not the service menu |
Replace IC3 on the ZCU BD |
| Zenith |
SM2745MK8 |
C8 |
No
Highvoltage |
Unit
had no high voltage and would not turn on at all. After the main and
power/deflection modules were replaced the set still would not turn on but a
distinctive "click" was heard that was not present before. |
I
had tech check the B+ at the horizontal output transistor which was fine. I
then had tech inspect both boards had all the connectors filled. After
inspecting the top side of the board and checking the foils side of the board
it was discovered the connections to the base of the Horizontal output was
not touching the foil. Resoldering this connection corrected this television. |
| Zenith |
SM2745MK8 |
C8 |
No
Highvoltage |
Unit
had no high voltage and would not turn on at all. After the main and
power/deflection modules were replaced the set still would not turn on but a
distinctive "click" was heard that was not present before. |
I
had tech check the B+ at the horizontal output transistor which was fine. I
then had tech inspect both boards had all the connectors filled. After
inspecting the top side of the board and checking the foils side of the board
it was discovered the connections to the base of the Horizontal output was
not touching the foil. Resoldering this connection corrected this television. |
| Zenith |
SY2768 |
GX |
no
startup |
Units
using the 9-1583 & 9-1612 Series
modules possible no start up of power supplies at low temperatures: |
Replace
RX3299 62 ohm resistor with a 47 ohm 1/2 watt resistor |
| ZEN |
Z48Z83D |
GZ |
no
turn on |
Z48Z83D
Unit will not turn. Tech replaced power supply/deflection and signal modules
but still cannot get the set to turn on. |
Was
it happening when the power is turned on is the set is tring to turn on, It
has B+ and Drive at the horizontal output transistor but the power supply is
going into ocer current shut down. Suggest the tech remove the high voltage
lead from the HV block ad stick thhe high voltage end of it in a glass coke
bottle or equivelent to prevent it rom arcing to stratigic areas on the
chassis. We found that high voltage returned . Unit has a
defective HV block. A-17196-05 |
| ZEN |
PVY5265 |
GZ |
No
Video |
Unit
has no video, no OSD, and a slick rasterwith an Red Green and blue horizontal
lines at the top of the screen |
Unit
has an open R3242 100K 1/2 watt resistor located behind behind the flyback
under a Large power resistior. |
| Zenith |
B50M88W |
ZP88 |
OSD |
Random
characters appear in OSD when adjusting the volume controls and possibly under other conditions. |
Install
software upgrade kit part
number 800-01210 this includes a EPROM main CPU and OSD CPU |
| Zenith |
B50M88WA |
ZP88 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly under other conditions. |
Install
software upgrade kit part
number 800-01210 this includes a EPROM main CPU and OSD CPU |
| Zenith |
IQB60M92W |
ZP88 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly under other conditions. |
Install
software upgrade kit part
number 800-01210 this includes a EPROM main CPU and OSD CPU |
| Zenith |
IQB60M90WA |
ZP90 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly under other conditions. |
Install
software upgrade kit part
number 800-01210 this includes a EPROM main CPU and OSD CPU |
| Zenith |
SY2768 |
GX |
OSD |
Symptom:
customer menu breaks up or tears set turns off within 30 sec set turn on but
will turn off if given a command from either keyboard or remote. |
Replace
D6003 on main module |
| Zenith |
IQB50M90W |
ZP90 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly
under other conditions. |
Install
software upgrade kit part number 800-01210 this includes a EPROM main CPU and
OSD CPU |
| Zenith |
IQB50M90WA |
ZP90 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly
under other conditions. |
Install
software upgrade kit part number 800-01210 this includes a EPROM main CPU and
OSD CPU |
| Zenith |
IQB50M92w |
ZP90 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly
under other conditions. |
Install
software upgrade kit part number 800-01210 this includes a EPROM main CPU and
OSD CPU |
| Zenith |
IQB55M90W |
ZP90 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly
under other conditions. |
Install
software upgrade kit part number 800-01210 this includes a EPROM main CPU and
OSD CPU |
| Zenith |
IQB55M92W |
ZP90 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly
under other conditions. |
Install
software upgrade kit part number 800-01210 this includes a EPROM main CPU and
OSD CPU |
| Zenith |
IQB60M90W |
ZP90 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly
under other conditions. |
Install
software upgrade kit part number 800-01210 this includes a EPROM main CPU and
OSD CPU |
| Zenith |
IQB60M90WA |
ZP90 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly
under other conditions. |
Install
software upgrade kit part number 800-01210 this includes a EPROM main CPU and
OSD CPU |
| Zenith |
IQB60M92W |
ZP90 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly
under other conditions. |
Install
software upgrade kit part number 800-01210 this includes a EPROM main CPU and
OSD CPU |
| Zenith |
RB50M88WA |
ZP90 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly
under other conditions. |
Install
software upgrade kit part number 800-01210 this includes a EPROM main CPU and
OSD CPU |
| Zenith |
RB60M90W |
ZP90 |
OSD |
'Random
characters appear in OSD when adjusting the volume controls and possibly
under other conditions. |
Install
software upgrade kit part number 800-01210 this includes a EPROM main CPU and
OSD CPU |
| Zen |
SR2738RK |
C11 |
Picture
Washed out |
Poor
washed out pix, "Milky". . Looks like bad CRT at first. |
RX3237
had increased in resistance from 2.2 to 4 ohms. Causing the Filament voltage
to be about 2 volts. Replacing the device with the a new 2.2 at 3 watt
corrected the symptom. Thanks to Bill Arnold, Manticia, Cal. |
| Zenith |
B27B40Z |
CB |
PIP |
Loss
of pip for sets made weeks 25-32 of
1999 |
Order
a new pip module 9-2110 Or repair it
by rerouting the grounding as per instructions |
| Zen |
Z60Z83D |
GZ |
PIP |
Z60Z83D
unit has no chroma in the PIP mode. Unit functioned fine up until the signal
module was replaced . Now after 1 year the customer noticed the PIP has no
chroma. Customer never used before this time. |
Tech
needs to order the PIP module. |
| ZEN |
SL2784BT |
C8 |
Poor B/W tracking |
SL2784BT
black and white tracking of off. Shorting the cathode |
Unit
will need CRT # A68AGD00xzx |
| Zen |
SY2549 |
GX |
Poor B/W tracking |
SY2549S
serial 721-42250498 Unit has poor black and white tracking Tech calling in
for CRT replacement. |
Asked
tech to check all the voltages at the CRT socket. All voltages are within
normal constraints with the exception of the G1 voltage at the CRT which was
at 130 vdc instead of 18 vdc. Unit had a open Q2205 |
| Zenith |
A19A20D |
GA1 |
Power
Supply |
Unit
keeps on blowing the main line fuse FX4301 opens as soon as power is attached
to the unit |
Unit
had defective DX3409, DX3408, DX3407, AND DX3406. All diodes shorted in power
supply. Replacing diodes returned the set to normal operation. |
| Zenith |
A19A20D |
GA1 |
Power
Supply |
Unit
keeps on blowing the main line fuse FX4301 opens as soon as power is attached
to the unit |
Unit
had defective DX3409, DX3408, DX3407, AND DX3406. All diodes shorted in power
supply. Replacing diodes returned the set to normal operation. |
| ZEN |
SR2773DT |
C11 |
purity |
SR2573DT
Serial 522-62390044 Unit has a loose shadow mask Tube was replaced 3 months
ago. |
This
tube will be under warranty. A63ACT001X |
| ZEN |
SY2788DT |
GZ |
purity |
SY2788DT
serial Unit has a sever purity distortion on the left side of the screen. |
Tech
did not elaborate about the type of video that he saw on the screen. Whether
it has bright areas of the screen or if it was not related to high brightness
conditions. Tech is asking for CRT replacement approval. |
| Zenith |
PV4663RK |
C8 |
Raster |
Unit
fades to black with a no raster symptom then will fade back on |
This
condition took about 40 seconds for the picture to completely disappear. The
problem was a loose filament supply for the CRT's on the Deflection/ power
supply board. |
| Zenith |
PV4663RK |
C8 |
Raster |
Unit
fades to black with a no raster symptom then will fade back on |
This
condition took about 40 seconds for the picture to completely disappear. The
problem was a loose filament supply for the CRT's on the Deflection/ power
supply board. |
| ZEN |
SY2522RK |
GX |
raster |
SY2722RK
serial # 681-32431171 Unit has a green raster. |
The
video outputs were replaced 2SC5147
original number. Parts sent out a
2SC3229 |
| Zen |
PVY5265RK |
GZ |
raster |
PVY5265RK
Unit has no raster. When the G2 is rasied up the CRT will illuminate with 2
horizontal lines near the center of the picture |
When
monitoring the B+'s on the deflection board it was discovered all the
supplies are normal. But after checking the input for vertical drive to the
deflection board on connector 3G2(2) we found no vertical drive. This should
be a 5 volt p eak to peak narrow pulse at 16.6666 ms. Tech will have to
replace the 9-1713 module. This module only comes with all the all of the
daughter boards attached. |
| ZEN |
SY3288DT |
GZ |
Raster |
The
set had good sound and no raster or OSD. Has high voltage and deflection.
Unit will get full raster if G2 is increased |
R3234
a 110k resistor off pin3 of the ihvt was open. |
| Zen |
Z27X22D |
|
Raster
missing |
I had a dark screen only when I use the
tuner input, no screen or speaker noise of any kind. Everything else in the TV worked just fine
like input from the A/V jacks, OSD, menu etc... Tuner voltages were fine too.
I suspected the tuner and replaced it...big mistake ! That did not solve the problem. So I went back to basics and started
taking voltage measurements. |
To
my surprise, I found that video processing ICX2200 marked TA1242N had very low voltages all over its pins
! I checked the B+ to the IC and it
was zero ! That basically solved the
problem. I traced that B+ back and
found C1233 470uf/10v leaky. I replaced it with a 470uf/16v (I thought
a 10v cap is too low to filter a 9v supply).
However that did not bring the voltage back. I tested L1208 which is connected to C1233 and to the 9v
regulator IC3441 and it was open ! I
forgot to mention that my first test was actually on that 9v regulator which
was fine. I bridged L1208 with a very
low value resistor just for testing and viola !! Thanks for all the help :) Bill |
| ZEN |
B27A24Z5 |
CA |
Regulation |
Unit
has narrow raster with blooming if a bright screen appears or one operates
the Brightness control. |
Regulated B+ not very stsable. Ranges from
130 volts to 103 volts. Replace CX3416 primary side of smps |
| Zenith |
IQ5270DT |
C8 |
Remote |
Zenith
IQ5270DT. Does not respond to any functions from remote. |
Replacement
module not in correct vendor mode. Stuck in factory mode. |
| Zenith |
H2733DT |
GXC |
Remote |
poor
short distance operation of remote caused by energy efficient lighting. |
Replace
I.R. receiver with p# 162-00041 |
| Zenith |
SD2735 |
DIGITAL |
retrace
lines |
Unit has colored retrace lines at the top
of the picture. |
These
are not retrace lines, but the Auto CRT Bias pulses. There is a Capacitor
that needs to be removed from the 9-605 module to correct this problem . IF
capacitor is removed the condition stops. |
| Zenith |
SD2735 |
DIGITAL |
retrace
lines |
Unit
has colored retrace lines at the top of the picture. |
These
are not retrace lines, but the Auto CRT Bias pulses. There is a Capacitor
that needs to be removed from the 9-605 module to correct this problem
.REMOVE C2113 LOCATED NEXT TO 3K4 CONNECTOR. IF capacitor is removed the
condition stops. |
| Zenith |
A27B35W |
GA2 |
Retrace
lines |
Unit
has heavy retrace lines then shuts down Unit only has 44 volts at the cathode
of the CRT. CX3296(+) had only 77 volts. |
Looking
at CX3296 on the top of board there was some staining around the capacitor.
It's ESR was over 1000 ohms. In otherwords open. Replacing CX3277 corrected
the symptom. 10 mdf @ 250 vdc |
| ZEN |
Z27X22D |
GX |
retrace
lines |
Z27X22D
Unit has excessive green screen with retrace lines. Tech calling in for CRT
approval. |
I
had tech check the Q5102 and compare reading to te other two transistors
Q5101, Q5103. Q5102 has a F/B reading on 0.1 on a fluke 77 meter in the diode
mode. This reading indicates the transistor is leaky and does not have the
typical 0.6xx F/B reading like the other transistors. Tech replaced the Q5102
but still had green screen with retrace lines. After checking the three RGB
drive signals The tech found the R & B drives at connector 2C5(1&3)
had 2.2 volts on them where as 2C5(2) had 3.7 vdc. Measuring the RGB output
pins of ICX2200(19,20,21) had all the same voltages on them. Each of these
test points should be the same voltage if a all snow pix is displayed. Unit
also had a open Q2205 |
| Zen |
SM2745MK |
C8 |
RGB (only missing 1) |
The
set will have a haze to the picture that will mimic a defective CRT. In this
case the picture was a Red haze on the screen. Could not achieve good black
and white tracking. |
In
this case the tube was replaced but the symptom remained the same. If a
crosshatch pattern were put on the screen the vertical lines would be absent.
Suggest the tech check the following resistors; R5110, R5111, R5112 all 120K
ohm 1/2 watt. Replacing them corrected the symptom |
| Zen |
SM2745MK |
C8 |
RGB (only missing 1) |
The
set will have a haze to the picture that will mimic a defective CRT. In this
case the picture was a Red haze on the screen. Could not achieve good black
and white tracking. |
In
this case the tube was replaced but the symptom remained the same. If a
crosshatch pattern were put on the screen the vertical lines would be absent.
Suggest the tech check the following resistors; R5110, R5111, R5112 all 120K
ohm 1/2 watt. Replacing them corrected the symptom |
| Zenith |
IQB27B44W |
CB |
shut
down |
CB
Chassis set and in models intermittent shutdown problems |
Replace
bead Inductor TX3415 with new part number 149-549 |
| Zenith |
IQB32B42W |
CB |
shut
down |
CB
Chassis set and in models intermittent shutdown problems |
Replace
bead Inductor TX3415 with new part
number 149-549 |
| Zenith |
IQB32B44 |
CB |
shut
down |
CB
Chassis set and in models intermittent shutdown problems |
Replace
bead Inductor TX3415 with new part
number 149-549 |
| Zenith |
IQB36B42W |
CB |
shut
down |
CB
Chassis set and in models intermittent shutdown problems |
Replace
bead Inductor TX3415 with new part number 149-549 |
| Zen |
Z20A11 |
GZ |
shut
down |
Z20A11 Unit will not turn on. Unit will shut down
immediately |
Checking
the out vertical output we found that we did not have any vertical output.
Only a horizontal line across the screen. The tech needs to check the power
supply voltages at the power inputs of ICX2200 Pins 9, 26, 46, & 48, It was discovered that we only had 9 volts
on pin 26. Pins9, 46 & 48 were low. Checking the 9 volt switched supply
we found the 15 volt switched supply was OK on IC3441(IN) but nothing at the
o IC3441(OUT) It should have been the SW9 volts supply. Defective IC3441
221-166-09 |
| Zenith |
B50M88W |
ZP88 |
shut
down |
This
is a B-line projection set (made by Hitachi) if set cycles on/off when
plugged in, look at the 32vdc led for the audio supply if not lit with the
rest of the leds |
Check
IC401 pin 9 Vcc for shorted condition also check E997 fuse for a open replace
IC401 |
| ZEN |
Z32X31D |
GX |
shutdown |
Z27X22D
Unit has a symptom of a pulsing picture. Unit has an intermittent symptom of
loosiong horizontal sweep then the picture goes dark then on again. Unit will
not stay on long enough for 1 complete field to be displayed. Tech monitors
the Horizontal output B+ and finds it fluctuated from 130 volts. Horizontal
Driver |
The power supply is stable. Unit has had a
defective CPU ICX6000. |
| Zenith |
PVY5265 |
GZ |
Smeared video |
Unit
has smeary blue registration and tracking. Blue CRT is the only one with the
defect. Moving the Green socket to the blue CRT give a clear blue
registration. |
The
set also had smeary blue which had the (very common) open R5103 120K resistor
on the blue CRT board. This condition
could happen on any ane of the CRT boards. |
| Zen |
PVY4665RK |
GZ |
Star
Site / GemStar |
PVY4665RK
serial 621-15451192. Customer had subscribed to StarSight whereas the TV had
the StarSight decoder built in to allow the viewing of a type of TV Guide
information. The customer has now discontinued the servvice, but cannot keep
the clock from reverting to Eastern time After the clock reaches 11:59PM the
set will indicate 3:00 AM automatically. |
Customer
needs to turn off the StarSight function. In the clock ment the customer
needs to set the Time to Pacific time, and turn auto clock to "OFF"
Reset the time. I had tech try setting the clock to 11:59 PM and wait for a
few minutes and see if the clock reads the correct time after these few
minutes after 11:59 pm. The clock did indicate 1:03 am and appeard that it
will operate normally. The tech will put in the correct time and will call
customer tommorrow. |
| Zenith |
Z32X31D |
GX |
system
control |
Zenith
Z32X31D. Unit stuck in the wrong level mode, and cannot adjust the |
Set
to Level 1 Zenith label and set the vertical parameter 11 from 35 to 40 |
| Zenith |
Z36X31D |
GX |
system
control |
Zenith
Z36X31D Unit will not turn off, unit is always on. A 9-1813N was replaced for
a dead set symptom. |
Cannot
set the level adjustment to level 2. Unit only has level 0 and 1. This may
only be a minor problem. I had tech go into the tech menu and set the Factory
mode to 1. And look at the parameter of A.C on/off feature. It was set to
"0". This feature needs to be set at "1". It is used only
when the television is switched on and off by an external AC switched source. |
| Zenith |
Z25A11S |
GA |
tuning |
All
television using modules 9-1789, 9-1790, 9-1827, 9-1829,9-1831, 9-1832,
9-1833 and after replacing the original 175-2721 tuner with a new 175-2721
tuner and the picture is snowy or black |
Change
RX3417 from 680ohm to 220ohm 1/2 watt the new tuners have slightly different
operational parameters in the AGC circuit. |
| Zenith |
Z25A11S |
GA |
tuning |
All
television using modules 9-1789, 9-1790, 9-1827, 9-1829,9-1831, 9-1832,
9-1833 and after replacing the original 175-2721 tuner with a new 175-2721
tuner and the picture is snowy or black |
Change
RX3417 from 680ohm to 220ohm 1/2 watt the new tuners have slightly different
operational parameters in the AGC circuit. |
| Zenith |
SY2788DT |
GX |
tuning |
SY2788DT.
Unit looses AFT lock on channels 16, 42, 48, & 55. Customer is on CATV |
Problem
is caused by the setting of AFT hold parameter is not high enough. The
parameter has a range of 1 through 7. This set had to be placed on 7 in order
for it to correctly tune these no standard signals |
| Zenith |
SY2788DT |
GX |
tuning |
SY2788DT
/unit does not have proper AFT correction . Unit is running into a AFT search
instead of locking into the channel immediately. |
Tech
had to get into the factory menu mode and setup the AFC and Band settings. |
| ZEN |
PVY5265RK |
GZ |
tuning |
PV5265RK
Unit looses the tuning of several channels. Extremely intermittent |
Suggest
the tech replace the main CBA 009 |
| Zenith |
A27A23W |
GA |
vertical |
Zenith
A27A23W Unit. Unit has an intermittent loss of vertical sync during specific
scenes that have explosions or bright flashes in the screen. |
A
cap need to be changed at ICX2200 pin 39 from a 10 mfd to a 1 mfd. This is
the video input to this IC and too much capacity was chosen for this input |
| Zen |
C32A24T |
CA |
Vertical
sync |
When
playing a video or a DVD in the composite or S-video input the set will loose
vertical during a high brightness display. Like when an explosion is being
played back |
Problem
can be seen at C2224(minus side) The luminance is compressed during the high
white portions of the picture. When freezing the DVD during the explosion
scene video and sync flatten. Where at C2224(+) side the video is not
compressed. Replacement of C2224 a 1mfd@35vdc cured the trouble. |
| Zen |
C32A24T |
CA |
Vertical
sync |
When
playing a video or a DVD in the composite or S-video input the set will loose
vertical during a high brightness display. Like when an explosion is being
played back |
Problem
can be seen at C2224(minus side) The luminance is compressed during the high
white portions of the picture. When freezing the DVD during the explosion
scene video and sync flatten. Where at C2224(+) side the video is not
compressed. Replacement of C2224 a 1mfd@35vdc cured the trouble. |
| Zenith |
SG5245Y |
C1 |
will
not turn on |
Unit
won't fire up. B+ is ok ,12 v standby ok.. Pressing switch nothing happens.
model no SG5245y. chassis no 9-592-4. SMPS seems to be working ok. |
CX3439
a 4.7mfd @ 35 vdc was open. |
| Zenith |
Z48Z83D |
GZ |
will
not turn on |
Z48Z83D
Unit will not turn. Tech replaced power supply/deflection and signal modules
but still cannot get the set to turn on. |
Was
it happening when the power is turned on is the set is trying to turn on, It
has B+ and Drive at the horizontal output transistor but the power supply is
going into over current shut down. Suggest the tech remove the high voltage
lead from the High voltage block ad stick the high voltage end of it in a
glass coke bottle or equivalent to prevent it ROM arcing to strategic areas
on the chassis. We found that high voltage returned . Unit
has a defective HIGH VOLTAGE block. A-17196-05 |
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