Question about Televison & Video
I suspect this is a standard malady for CRTs but here are the specifics of the set:
RCA 31" Home Theatre F31700GG chassis #CTC169JS5.
The thin white horizontal lines (slightly sloped) are across the entire picture and are spaced about 1 inch apart with some compression of spacing towards the top of the screen and expansion of spacing as towards the bottom of the screen (I suspect vertical scan related). The desired image is barely visible with a pinkish-grey cast. When I adjust the Screen potentiometer the TV shuts down.
I can replicate the lines on two other sets, a similar year model GE 27" and a really old RCA 19", by adjusting the Screen potentiometers.
I have all the schematics for the 31", a 275 MHz oscilloscope with built-in time interval multimeter, and two analog VOMs. Unfortunately I don't have a high voltage probe, power supply, or frequency generator.
Look for bad capacitors in the vertical deflection amp, and in the pin amp sections. This is common on most of these types of TV sets.
The caps tend to go high in ESR with age. It is best to use an ESR meter to find the bad caps. It will be a lot faster than workign out waveforms with a scope.
Wikipedia explanation about capacitor ESR:
Posted on Apr 24, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Mar 18, 2013 | Toshiba 27DF47 27" TV
Jan 26, 2010 | RCA F27442 27" TV
Aug 16, 2009 | RCA TruFlat 27F520T 27" TV
Jun 30, 2009 | Sanyo DS31590 31" TV
Oct 19, 2008 | Televison & Video
Apr 01, 2008 | Sanyo DS31590 31" TV
Sep 11, 2007 | RCA F32650 32" TV
Mar 08, 2007 | Sanyo DS31590 31" TV
2,957 people viewed this question
Usually answered in minutes!