Toshiba TV CX2780A help needed

[I_service]

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

 

[Max Harding vk3jin]

check the electro's inside the tuner..........i have had these do go faulty
at times.

 

[I_service]

Don't remember seeing any electrolytic cap inside tuner module but a bunch
of tiny surface mount caps, coils, a xtal and an IC. Do you mean IF module?
I have not looked inside the IF module yet.

Thanks.