rca ptk169pgb lost video

[L. Kotney]

RCA rear projection tv looses video after about
three minutes. Maybe unrelated but the picture also
creeps up from the bottom. I also have seen three
vertical lines r,g,&b bowed across the center of the
screen...thanks for any help.

Brotherinlaws tv trying to fix before the big game.
Auburn/Alabama...Go tigers

 

[David]

How about some voltage measurements?
Are all the main SMPS voltages correct on the secondary both in standby and
run?
What about the scan derived voltages?
Is the set losing vertical sweep due to the vertical circuit, or the jungle
ic circuit area?

How much experience do you have on the ctc169 series of chassis?
Is the service manual or schematic available.

Just not nearly enough information posted yet to even hazard a guess.
Do some basic tv electronics troubleshooting and post the results and where
you get stuck.

David

L. Kotney <kotney@charter.net> wrote in message
news:vr8as4mtt8732@corp.supernews.com...

RCA rear projection tv looses video after about
three minutes. Maybe unrelated but the picture also
creeps up from the bottom. I also have seen three
vertical lines r,g,&b bowed across the center of the
screen...thanks for any help.

Brotherinlaws tv trying to fix before the big game.
Auburn/Alabama...Go tigers

 

[BWL]

Sounds like it's losing vertical sweep. Not a real common problem on 169's,
although I've seen it before. All the ones I've seen were repaired by a
thorough soldering of the entire vertical circuit area...