RCA G27391WK Please Help!!!

[kingshanley]

I have had my RCA G27391WK for quite some time and it has been a great set!!! However after moving several times, The bottom 1/4 of the screen has been pushed up and the picture looks as if everone has stubby little legs....ROTFLMAO!!!!! Does anyone know if there is a way to resolve this issue???????????

[Gianni]

Re: RCA G27391WK Please Help!!!

In august I repaired a TV SET 21" Mivar (italian brand) and it has the lower part of the screen completely black and images were compressed in 3/4 of the top screen.
In my case I found a 2200uF 16V ruined.

If your problem depends on the moving the TV from a place to another, I would check all internal connectors and joint/tracks: if there are heavy components like transformer or big caps maybe moving too much the TV has cause them cracking joint/tracks.
Look also if there are components/cable touching each other when they should not.

Gianni

[kingshanley]

Re: RCA G27391WK Please Help!!!

Thanks for the reply Gianni, But I am more of an auto tech, than a tv tech so obviously.......You lost me....sorry!!!! could you put that in laymans terms for me please??????????????????

[MixMasta]

Re: RCA G27391WK Please Help!!!

Roughly translated:

Open up the set and look for damaged capacitors (leaking goo at the top or bottom). Look for anything that looks burnt up, look for anything that may have some how worked itself loose.

If you can't find anything, take some digital photos of the screen problem and some close up shots of the circuit boards, post them here, and I bet someone will be able to further direct you!

[Wizard]

Re: RCA G27391WK Please Help!!!

Hold on, going to look up on that model number to determine which chassis and possibly advise you. I work on RCA often.

Cheers, Wizard

[arneson]

Re: RCA G27391WK Please Help!!!

It's like me saying use laymens terms to discuss the reasons my engine light is on.
You have to know where the verticle deflection section is.It's next to the horizontal section.
Set up mirror to watch screen while reaching in with insulated device to tap that area while watching if screen returns to normal.
No change? cold spray each component. no change? resolder everything, no change? replace cap and verticle drive IC.Well that should do it.
See how simple it is.
Piece of cake.

[Gianni]

Re: RCA G27391WK Please Help!!!

@ kingshanley: I'm sorry my explanation was too tech for you, anyway I see MixMasta has translated it.

arneson has written the way I would follow to repair TV.

Gianni

[kc8adu]

Re: RCA G27391WK Please Help!!!

a chassis number is the most helpful.
if it has slowly gotten this way its probably just a few dried out caps

[Wizard]

Re: RCA G27391WK Please Help!!!

I finally got around to look up. CTC169, very good chassis back then and high good repair rate.

This is VERY unique vertical circuit design. PWM chop with a SCR on small heatsink on the horizontal pulses power from flyback transformer (isolated from others) using a LM311 opamp. Extremely reliable. Resolder the area and replace one big cap (I bet it exploded or swollen). 2200uF 35V

LM311 samples the two ramps created from two R/C via constant current one from fly (horizontal pulses) and one vertical pulses from the jungle IC and send out PWM pulses to SCR. That all. There are two small capacitors by that big cap, change these as well just in case.

Trace the smaller plug of two on the yoke back to the chassis board, it's in the front hidden by the plate heatsink for the horizontal transistor.
You will know you are in right place when u have grey or blue giant retangular plastic capacitor near two wires for vertical wires plug.

You should know this TV is now over 15 years old or more?

Cheers, Wizard

[arneson]

Re: RCA G27391WK Please Help!!!

That is not laymans terms unless he stayed at a Holiday Inn last night.
And just maybe the network had the Oompa loompas on and the legs really were short.