CTC 203 again.

[Skype_man]

Thanks for thr input, but I checked all that. Did the L14104
coil, unit runs perfect, just shut off,& on so quick, when you
turn your head, it's back on. replaced the Gemstar module
with two ribbons, as micro is in there, & could be getting
corrupt. Anything I missed? Unit hasn't been worked on
before. Did the arcing IHVT damage something, & make
it weak? Sky.

Flyback was arcing badly, replaced, works, & looks perfect,
but momentarily shuts off, & right back on, even before you
can look back at the set. may work for hours, or happen twice
in a half hour. Unplugged the customer controls on top of the set,
to make sure the "tact" switches aren't "leaky". Anything common
here? Nothing on the Thomson B2B website. Sky.

 

[[email protected]]

Sounds like it is time to hook up a 4 channel DSO to key points in the
set in order to find the problem.

It is the Thomson intermittents like this that pretty much require any
servicer invest in a 4 channel 100MHz DSO if they want to actually
diagnose the problem and fix it. So many times I found problem with
surface mount capacitors and conductive glue in this manner.

 

[Jason D.]

Sounds like it is time to hook up a 4 channel DSO to key points in the
set in order to find the problem.

It is the Thomson intermittents like this that pretty much require any
servicer invest in a 4 channel 100MHz DSO if they want to actually
diagnose the problem and fix it. So many times I found problem with
surface mount capacitors and conductive glue in this manner.

Does this TV have PIP feature? Pull the A/V module and resolder 2
SMD resistors one small and big for trimming voltage for 3.3V on LM317
regulator on small heatsink. This will do the 3 strike and out thing
if PIP/AV switch IC lose 3.3V.

Cheers, Wizard

 

[RonKZ650]

Also look for glue around the 2 crystals near the LA7612 IC. Causes bad
connections on the crystals. Nobody else seems to ever see this. I see
it often.