Burnt chip on Samsung X-buffer

[runeazn]

Anyone an idea which high low rectifier it is?
At least I think it is one.

[drussell]

Re: Burnt chip on Samsung X-buffer

That looks more like some sort of controller IC and there are probably shorted transistors downstream of it. Trace out where it goes and check all the large IGBT transistors for shorts and everything in between if there are small surface mount ones connected off that chip they are probably blown also.

[Ltank]

Re: Burnt chip on Samsung X-buffer

Give us Make and Model and IC part#. This way maybe it can be located by schematic or techs that have access to a board.

[popeye]

Re: Burnt chip on Samsung X-buffer

Anyone an idea which high low rectifier it is?
At least I think it is one.

You will most likly have to replace both buffers

[runeazn]

Re: Burnt chip on Samsung X-buffer

That sucks, tv still turns on btw. Havent taken a look but I think its still showing normal picture.
Also I'll post all information ill be able to find soon.

[tom66]

Re: Burnt chip on Samsung X-buffer

Hmm, that looks like Ve-bias circuit so it would cause dim/underdischarged image or sometimes pink tint.

[runeazn]

Re: Burnt chip on Samsung X-buffer

Hmm, that looks like Ve-bias circuit so it would cause dim/underdischarged image or sometimes pink tint.

you are compeltely right, when it was burning it had purpleish glow with a dim image! I left the xbuffer connector on the pdp display? This somehow got the IC burning.

The make of this tv is philips.
model : 42PF7320/10
PDP s42SD-yd07

and the model xbuffer is shown in the picture.

[tw2005]

Re: Burnt chip on Samsung X-buffer

It's a FET driver, I had a couple of guesses at it already. possibly one of them will work maybe you guys can work out from the cct which type of driver. both rated at 600v

https://www.badcaps.net/forum/showthread.php?t=43613

[runeazn]

Re: Burnt chip on Samsung X-buffer

Isn't the same chip findable on the ybuffer or something? As that is still working.

[tom66]

Re: Burnt chip on Samsung X-buffer

This is part of Ve(bias) so probably not...

[runeazn]

Re: Burnt chip on Samsung X-buffer

I guess, I'm going to need to buy a used xbuffer? As no1 can indetify the FET driver?

[tw2005]

Re: Burnt chip on Samsung X-buffer

I guess, I'm going to need to buy a used xbuffer? As no1 can indetify the FET driver?

found this, looks like different part number but board looks same and off the same panel,

http://www.shopjimmy.com/samsung-lj9...main-board.htm

[runeazn]

Re: Burnt chip on Samsung X-buffer

Yeah looks similar problem is. I can't identify the chip on their picture

[tom66]

Re: Burnt chip on Samsung X-buffer

$21 isn't bad, you can't get board cheaper in Europe somewhere?

[runeazn]

Re: Burnt chip on Samsung X-buffer

They go for 80$ here.
I tried to buy my x-main on Alibaba.com not sure if it will arrive, but I paid with creditcard so it should be fine.