Tcl pdp42u3h

[Amraks]

Re: Tcl pdp42u3h

Made a big mistake just blew 2x450v 680uF caps on the sustain board.
lucky for me there was a rail for the tv stand to mount to in the way.
them caps are loud when they go off.

Not sure why this happened but I was probing the right connections I'm sure.

maybe it was because my multimeter was in the off position.

Oh well checked over everything else around that area seems fine so now I will be buying some expensive caps.

might recap that power board to rule it out all together.

Just realized too LG make half of this tv.

[tom66]

Re: Tcl pdp42u3h

Made a big mistake just blew 2x450v 680uF caps on the sustain board.
lucky for me there was a rail for the tv stand to mount to in the way.
them caps are loud when they go off.

Not sure why this happened but I was probing the right connections I'm sure.

maybe it was because my multimeter was in the off position.

Oh well checked over everything else around that area seems fine so now I will be buying some expensive caps.

might recap that power board to rule it out all together.

Just realized too LG make half of this tv.

I can't figure out how you could "blow" some caps? Did you short them out? That would make a bang, it wouldn't be good for the caps, but they would probably survive to work another day. However the fuse is almost certainly blown and the bridge rectifier and PFC diode are probably not too happy.

[Amraks]

Re: Tcl pdp42u3h

I was probing the Va just plugged into the ground and BANG.
Multimeter was in off position at the time.

the protector covers on the caps have blew off.

No fuse blew.

[tom66]

Re: Tcl pdp42u3h

I was probing the Va just plugged into the ground and BANG.
Multimeter was in off position at the time.

the protector covers on the caps have blew off.

No fuse blew.

The caps may still be okay, but does the set still power up... the PSU may be damaged... or perhaps you shorted Vs to Va (very, very bad... plasma panel is probably destroyed due to horizontal driver failure.) Vs is ~200V, Va is ~60V.

[Amraks]

Re: Tcl pdp42u3h

Plasma still powers up but the picture is crappy and looks all chrome.
I don't see any thing else damaged apart from them caps. it was a loud bang.
So I reckon they are a problem. Ill get salvage some more out of something.

[Amraks]

Re: Tcl pdp42u3h

Ok had another look when I had free time.

It was a fuse now back to square one the picture isn't very sharp.

the background picture looks a bit pix-lated.

I tested the big caps on the board that plugs into the inverter boards.

I'm unsure what the name of that board is.

[Amraks]

Re: Tcl pdp42u3h

I will explain it better how the picture looks.

everyone on tv suffers from a skin condition jaundice. thats how it looks lol.

[tom66]

Re: Tcl pdp42u3h

It could be a digital board problem, but it is hard to tell. Does the problem appear on all inputs? Does it affect OSD, menus, etc?

[Amraks]

Re: Tcl pdp42u3h

Good questions. All OSD menus look normal.
I have a set top box plugged in on the av inputs and the OSD menu looks normal on that too.

I could try vga input off the laptop watching a movie.

[tom66]

Re: Tcl pdp42u3h

So the set top box menus look normal? That is odd, are you sure problem isn't with the STB?

[Amraks]

Re: Tcl pdp42u3h

hey just checking it now and have my desktop up on the tv and the desktop looks all white. it don't stand out like it does as I'm looking at it on a laptop lcd.

the picture is dark looking and its like the tv is color blind.


Set top box works fine. I have tested several.

[tom66]

Re: Tcl pdp42u3h

Pic of fault? Maybe Z-sustain.

[Amraks]

Re: Tcl pdp42u3h

How can I test the Z sustain?

I replaced a fuse on that board to get it working to where it was.

also on that z sustain was 2 fuses.

Also the IPM is heating up as it should, But I dunno if that means anything or not to you?

Also the pot on the z-sustain does nothing to the picture when you turn it.

[tom66]

Re: Tcl pdp42u3h

Don't just turn pots randomly...

If you show a detailed picture of the fault (like with a test pattern) I will make a guess, but I cannot be certain.

[Amraks]

Re: Tcl pdp42u3h

http://flattvparts.co.uk/index.php?m...oducts_id=2116

[Amraks]

Re: Tcl pdp42u3h

Ok wheres a good place to get a test pattern?

Also I'm getting flickers on the screen.

[tom66]

Re: Tcl pdp42u3h

You can connect your PC/Laptop up to the TV and draw some horizontal and vertical lines, maybe use a grid pattern.

[Amraks]

Re: Tcl pdp42u3h

Ok I will do this tonight.

Also what is causing this to flicker after a few hours of use.

[tom66]

Re: Tcl pdp42u3h

Could be a cold solder joint, or bad caps.

[Amraks]

Re: Tcl pdp42u3h

Flashing stop when you hit the Y-sustain IPM heat sink with a screw driver..

Would that be the cause of the flickering?