CTC185

Brand	CHASSIS	Model	Keyword	SYMPTOM	CURE
RCA	P61310	P61310	Convergence	When unit it turned on the TV has an obvious mis-converged picture. Heat sinks on the convergence power supply, and output board. Are running cold.	P19304(9) is the 12 volt source that turns on the convergence power supply. This was normal. Raw B+ OK at Q19701(D) measuring 155 VDC. When checking the components in the primary of T19702 nothing was shorted. Unit had a open soft start resistor R19701 390K 1/2 watt.
RCA	P61310	DTV306GC	CONVERGENCE	Unit has no convergence correction. When feeling the heat sink of the convergence power supply we discover it was cold after the TV was running for under 5 minutes. All heat sinks should have been warm to the touch.	CR19710/CR19713 were shorted. However a problem was found when trying to get the replacement part. A bulletin TV 02-002 indicates the part number as 227066 but as of 6-20-2002 is on national back order. The new part number is changed to 234048 (part number 227066 has been discontinued)
RCA	P61310	DTV307GA	DEAD	P61310 DTV307GA U14102 Power Supply Dead Set, Fans start up and then shut down.	Found U14102 shorted pin 1 to 2 in run power supply. Replaced the photo coupler
RCA	P61310	DTV307	DEAD	Dead, AC fuse blown (F14200)	Troubleshooting Hint: Check for a shorted Q19701 on the convergence power supply and repair if necessary. Check for a shorted CR14611 which supplies the 33v to the PIP tuner. Check ALL parts listed below and replace if necessary. Common Defective components involved: Q14601 201152 Q14602 248597 Q14603 232218 R14604 241313 (15ohm 1/2watt flameproof) CR14615 227887 (5.1v zener 1.3watt) CR14613 236168 (12v zener 1.3 watt) CR14611 227066 (More reliable) F14200 243853 (6A mini fuse) R14606 215212 (3ohm 3watt)
RCA	P61310	DTV307	Dead	Repeat failures of Q14601, or the transistor overheats after replacement.	Gate voltage of transistor reads higher than nornal. check or replace C14601 2.2MFD. Part number 242026 Thanks to Yakov Budilov@45
RCA	P61310	DTV307	Dead	Unit had failure in power supply. Tech replaced the Q14601 and F14200, but when power was reapplied the transistor instantly shorted and fuse opened again.	Further checking found that Q14603, Q14601, CR14613, R14604, CR14615, & CR14611 were also defective.
RCA	P52310	DTV307	Dead	Unit will not turn on. Standby voltages at the DM-1 module is OK but the Chassis standby is low and chirping. The area around Q14601 circuitry is chirping. All standby voltages are about 10% of normal except CR14611 where we have no voltage.	Tech found the shorted CR14611 on the secondary of T14600. Replaced the diode and the set operated again. NOTE: This resistor supplies the +33 vdc to the PIP tuner. In this case the current limiting resistor should be checked. It is located under T14600. It's value is 10 ohms 1/2 watt. It is possible that this resistor is burned and if so it will compromise it's reliability. If burned, change it! part # 241259
RCA	P61310	DTV307	High voltage	PS65000 DTV307 CR14608 Power Supply On plug in the high voltage would come up without turning on the set.	Went to micro and found pin 4 at 5 volts checking pin 16 it had .3 vdc went to standby supply and cr14608 was at .6 volts. The diode checked good, replaced and got the 5 volts back, but Replace CR14608
RCA	P61310	DTV307	Horizontal Sweep	Unit has insufficient horizontal sweep. Deflection B+ was running correctly at 67 vdc. This is the normal B+ here at T14800(14). The Horizontal width would vary in the tech menu. It just did not seem to have enough range. Checking around Q14803(E) found it to be 4 volts instead of 5.1	These components are located in the Width reference circuit. CR14802 appears to be leaky, Replacing the device corrected the symptom. This was a 5.1 volt zener diode.
RCA	P61310	P61310	No Turn on	No turn on of the Television. The . DM-1 power supply module not be running.	We are seeing an increased failure of C14115 and C14113 (P/N 248988) on the DM-1 module. Until part orders are completed some techs have been using generic replacements ( typically 4700MFD@25Vdc) in order to get the customers set up and running. Please note that this is a critical safety component. The temperature rating of the mfg cap is 105degrees C and the generic is generally the standard 85degrees C. You must install a cap with the proper temperature coefficient. The new capacitor must have the proper temperature rating of (105C). RCA New style capacitor is a a gold color with a blue stripe.
RCA	P61310JX2	DTV307	ON but no control	When the TV is plugged in the TV turn on with high voltage but no vertical sweep but have only 4 inches of horizontal sweep.	When checking the Microprocessor U13101 B+ we found that the voltages were only 2.2 volts. In fact all stand by voltages were approximately 50% of their normal values. Further checking the secondary of T14601 tech found CR14602 is shorted. Part# 234048
RCA	P61310	DTV307	PIP	No PIP from the second tuner. PIP operates correctly if the PIP source is composite or S-video.	This TV was a "call back" The previous symptom was a dead set. Tech found a shorted CR14611, but did not see the burned resistor caused by the shorted diode R14609. This device is located underneath T14600. You will have to remove the transformer to gain access to it. Tech replaced the resistor and corrected the no PIP from PIP tuner symptom. part is a 10 ohm 1/2 watt resistor. Part# 241259
RCA	P61310	DTV307	Power not turning on	This unit acts as though it is not turning on. But if the tech turned up the screen control the CRT there is no Horizontal sweep. Also the TV is actually "ON" It never shuts down.	Unit has shorted -12 volt rectfier CR14602
RCA	P52310	DTV307	Raster, Sound missing	Unit has no raster or sound in any input but in HDTV 1080i. All other inputs are inoperative. OSD is fine	Checking around the DM1 module we found the (Minus)5 volts at the output of U14103 was only (minus)2 volts where the input was the same. This was caused by CR1408 Part #234048 which had broken down.
RCA	P61310	DTV307	SATELLITE RECEIVER NOT WORKING	No satellite reception. Found output from DM-1 was at 25vdc when measured at the satellite cable input connector. It should have been switching from 13 to 18.	Checking U24502 on DM-1 power supply we found pins 2 and 4 shorted, removed short and unit started working properly removed short between pins 2 & 4 of U24502
RCA	P61310	DTV307	SATELLITE RECEIVER NOT WORKING	No Sattelite reception. Unit does not have the 13 to 18 vdc out of the DM-1 modules on the Satellite input connector. It was "0" volts.	Checking U24502(7) had "0" volts on it, and there was a direct short to ground. CR24501 was shorted pn# 232244
RCA	p61310	DTV307	Shutdown	Unit will not power up the high voltage system. Shuts down instantly	checking the secondaries of T14100 the tech found all secondaries would ramp up then turn off except the -30 vdc source. Closer inspection find that coil L14601 had a ring fracture around the pin preventing the pulses to be rectified by CR14602. Resolder connection and the trouble was solved.
RCA	P61310JX2	DTV307	TUNER IN OPERATIVE	P61310JX2 DTV307GA CR14109 Power Supply The tuner failed to work in the antenna mode. The Dish and video inputs did work. The DM1 checked out.	We found the 33-volt supply down to 16- VDC. CR14109 (33-volt zener), located on the DM-1 module power supply, was leaky. Replacement restored normal operation. replaced CR14109