Coby TFTV4025

[kf4rca]

Anybody know anything about this roadside find? Appears to be fairly new.
Screen appears to be intact.
Its a 40 inch that sold for about $140 when new.
Would not turn on, easy fix, bad caps.
Changed all the puffed ones, now it turns on, only to shut off after a few seconds. Probably need to change the remaining caps.
Unlike most sets, the modules mount to the plastic rear cover.

[JohnCT]

The *fastest* way to triage one of these video toilets is to take a heat gun and flood the boards with heat for about 5 minutes. Get them good and hot but don't melt anything...

If it starts and stays on, about a 95% probability a lazy (high ESR) electrolytic cap(s) is causing the problem.

We can't spend any real time on these so we need to get in and out and be accurate with our estimate. Heat works wonders.

John

[Titan1a]

I have a smaller Coby that needs a new mercury light. It works but the color balance is awful. Is it replaceable?

[JohnCT]

Originally Posted by Titan1a

I have a smaller Coby that needs a new mercury light. It works but the color balance is awful. Is it replaceable?

Are you sure the CCFLs are bad? Even smaller LCD tvs will have at least 5 CCLF tubes, not a single tube.

Generally speaking, they don't all go bad at the same time, and while I've seen a bunch of bad tubes, they generally show up as a reddish band across the area where the tube is. If the entire display shows poor color balance, I'm thinking it's not a bad CCFL tube(s).

Also, most CCFL tubes will reach a point where the voltage to maintain conduction rises to the point where it trips the controller IC and shuts down the back light.

If you post a model number, I can check on it. I've seen TCON boards cause weird color and gamma issues.

John