RCA L32WD22 TV dead

[smason]

I'm working on an RCA L32WD22.
The front panel LED is yellow in standby, when you press the power button the LED flashes. No codes as far as I can tell just a constant flash.

Power supply outputs:
5v is only 3.4v
12v 15v and 24v are all ok.

If I hold down the power button for abut 10 seconds, the 5v comes up to about 4.5 the led gets brighter, then turns green, and 5v goes back down to 3.4v. No other signs of life (no backlight flicker, no noise from speakers)


If I disconnect the main board from the power supply, and leave the inverter plugged in, the 5v is 4.9ish. So either the supply is weak, or something on the mainboard is bad and loading it down. Will load test the 5v line later.

Visually nothing too amiss, though someone has done some poor soldering on the power supply, particularly the caps on the 5v output.
Caps are crap Elite brand so automatically suspect, just not sure if I want to throw caps at it if it winds up being an unrepairable mainboard like the last LCD TV I worked on.

More later.

[Chriso]

Re: RCA L32WD22 TV dead

Patch in a good 5v supply.

[Wizard]

Re: RCA L32WD22 TV dead

This power supply tend to have elite caps that does not bloat for at least some of them.

Also change all small capacitors in hot side section. Inspect the 5V regulator feedback circuit and the components for 5V standby supply. You may will find none or find one or two that is leaky or off value. Need multimeter. This is advanced job to trouble shoot.

Cheers, Wizard

[kc8adu]

Re: RCA L32WD22 TV dead

that 5v section runs hot.the caps are baked.see the darkened board under those caps?
had 12 of those sets given to me.caps and solder joints fixed all.

[smason]

Re: RCA L32WD22 TV dead

Thanks for the suggestions, I should be getting back to this one this evening, after some higher priority home repair chores.

[smason]

Re: RCA L32WD22 TV dead

Finally got to it tonight.
2 Lelon 1000uf/16v caps that looked fine on the top, had pushed out bungs on the bottom, and measured quite bad.
Replaced those, and a few others, some solder touch-ups, and it's good to go.

[Philly Cheese Steak]

Re: RCA L32WD22 TV dead

Finally got to it tonight.
2 Lelon 1000uf/16v caps that looked fine on the top, had pushed out bungs on the bottom, and measured quite bad.
Replaced those, and a few others, some solder touch-ups, and it's good to go.

Thank you! I got one sitting in my closet waiting for me to get to it, mine powered off. But doesn't have the flashing light like yours does, I get nothing. Hooked it up to my computer to make sure I had nothing coming out of it. I'll do some cap examination soon.

[Philly Cheese Steak]

Re: RCA L32WD22 TV dead

Finally got to it tonight.
2 Lelon 1000uf/16v caps that looked fine on the top, had pushed out bungs on the bottom, and measured quite bad.
Replaced those, and a few others, some solder touch-ups, and it's good to go.

I replaced the caps mentioned, got a repair kit of caps for it. Only thing is I have to big 1000UF/450V "Elite" caps that have not been replaced. When I power up the unit now I get a green light "when I hit power" but then nothing, upon powering down I get flash codes 5 and 12 with a yellow light. The unit is only about two years old, very clean inside.
Any suggestions............
Thanks!

[Philly Cheese Steak]

Re: RCA L32WD22 TV dead

OK so I'll make my own posting soon, my code is 17 not 5 and 12 as thought originally...

[sidneyaks]

Re: RCA L32WD22 TV dead

Sorry to resurrect a dead thread, but I figure it's better than starting a new one on the same tv. Mine has an issue where the video just cuts out, but I still get sound.

I pulled the power board so far and see that there is a very bad scorch mark "above" the 450v elite cap on the left, and some of the little chips on the other side also have scorch marks around them. Finally, there is a plastic guard that the board sits on that seems to be a little bit melted directly under that cap.

Knowing that, would it be possible to still work with this board? I can replace the capacitors, but It's a lot of work if the board is trashed. I attached pictures, sorry their kind of blurry, but it's the best I can do so far.

[Philly Cheese Steak]

Re: RCA L32WD22 TV dead

Sidney You need better pictures or higher resolution, I'd suggest to start a new thread so as to lesson confusion with the people trying to help you out. I still have yet to finish mine as well, I put it aside for other projects I'm working on. I think my problem is I didn't get low ESR caps to replace with.