Electronics > Repair

Samsung LCD - Weird Failure - Trying to Repair

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katzohki:

--- Quote from: Dave Turner on June 27, 2014, 06:52:30 pm ---Jackson Pollock eat your heart out.

On a more serious note - does the pattern vary? I don't mean the location on the screen, or its overall size. From what I can see there is a repetitive block pattern.

--- End quote ---

Yes, beside the fact that it tracks around the screen in "screensaver mode" the squares change a tad and pixels switch on and off. It doesn't seem like COMPLETELY random data, which is why I'm leaning towards the EEPROM as well...


--- Quote from: retiredcaps on June 27, 2014, 07:32:47 pm ---
--- Quote from: urbis on June 27, 2014, 10:34:44 am ---On Samsung TVs, when the caps fail, it's notorious for corrupting the EEPROM.

There may be a reset by shorting a couple of pins, but not entirely sure.

--- End quote ---
Like this?

http://www.badcaps.net/forum/showpost.php?p=305868&postcount=8

--- End quote ---

I've seen that, but when I press menu it is scrambled too. I want to try it, but I can't confirm the OSD menu! I guess maybe I can try to sort of guess my way through it...

Dave Turner:
I couldn't do it now, 'cos I don't know the system but back in the day of 8 bit micros you could sort of read the pattern in hex. Whilst more complex the same holds true now.

In this instance the question is whether a stable pattern helps point to the solution or is it irrelevant?

Rasz:
My main monitor is a Belinea 21' that does similar thing on VGA :), but works perfectly on DVI. When on DVI and with 1:1 mapping video is bypassing scaler completely. Try dvi before going further, even with corrupted flash or bad memory there is a chance it will work.

http://www.d43d.ru/forums/index.php?/gallery/image/1357-samsung-215tw/
http://img03.taobaocdn.com/bao/uploaded/i3/T1M9Y0XoNkXXaoqCvb_094912.jpg
http://remont-aud.net/_fr/86/4958775.jpg

as for the fault I dont think its flash, even solid background is corrupted on your picture. Check lvds cables, freeze/heat/tap ram chip.

tautech:
I got given a nice little widescreen 24" TV that had a similar complaint, saved from a skip on a hunch.
Problem was found when data cable to LCD was removed and re-seated.  :-DD
Still going strong 2 years later.  :-+

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