||AVM2528 No audio. At speaker
needs to check the source of audio to the output stage. We has audio all the
way up to the audio output transistors but not at the decoupling Capacitor at
the primary of the audio output transformer. C602 Dried out . 10MFD@ 160 VDC.
Unit is stuck in the Demo mode
and hold the menu key on the
television for 10 ~ 15 seconds or until the demo goes away
has dark raster with narrow raster. Measured B+ from IC001(4) and found it
was only 97 volts. IC001(3) was only 97 volta bit the B+ at C006(+) was 155
around main B+ regulator found that C007 was vented and R007 was open. Tech
replaced C007=4.7mfd@160vdc & R007=5.6ohm@2watt. Corrected the symptom.
tunning. When trying to change channels the numbers will change on the screen
but the tuner will not tune any channel. However when changing between
channel 6 and 7 there is a slight change in the background noise indicating
band switching has occurred.
monitoring the TB voltage at the tuner we found the voltage was always 0.1
volts. Monitoring the voltage at D502(K) we had 17 volts. Floating the TB
line on the tuner brought back our 33 vdc tuning voltage on TB. Tuner
defective. PN# 645-007-0938