Need help with this 14 year old (but still has excellent picture quality) Toshiba 27" TV CX2780A, chasis no. TAC9160. After TV on for about 30~45 mins., pictures from off air reception starts to roll and break up, however, pictures from composite video or S video input is not affected and of excellent quality. Appears to be a bad solder joint but could not pin point problem area. Help from anyone who has worked on this set with similar problem will be appreciated. Have service manual.
What I have done so far with no success:
- Check ESR of electrolytics near tuner module (such as C065, C062, C063), replace all caps with marginal ESR reading
- Re-solder all joints around tuner module
- Check Q201, no problem with this transistor
- Remove and open tuner module, re-solder all suspected joints
Could it be tuner module has gone bad, or there is still a poor solder joint or bad cap somewhere? Please remove _nospam from email address if direct reply.
Thanks