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4hv.org :: Forums :: General Chatting
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110v flat screen anyone?

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Conundrum
Wed Jan 23 2008, 10:04AM Print
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
Hi all.
Just acquired a 110v samsung 20" panel here, with a power supply fault.

Obviously this makes repairing it a little difficult, so does anyone here have a use for it? Its just over a year old and the panel looks fine.

Regards, -A
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Steve Conner
Wed Jan 23 2008, 10:43AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
What is it, a complete LCD TV, or just a pile of guts? Any idea what native resolution it is or what inputs it's got?
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Conundrum
Thu Jan 24 2008, 11:13AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
COmplete LCD, with HDMI, composite and VGA. AFAIK the guts are intact, the customer bought it over here from the 'States and it worked for a while then gave up.

the postage would probably suck however.. i have quite a few other TVs including tubes and inverter boards if you can use them :)

will test it and get back to you.

UPDATE:- it does power up, but there is random garbage that looks like fixed pattern noise on the LCD. It briefly clears on changing modes then comes back.

However, it looks a bit like the on screen display (OSD) chip may be responsible, so if I can kill its outputs then it might yet work.

someone suggested it may be the panel itself, but i'd need another samsung TV to test this theory. it has the standard LVDS connector so it might be feasible to do a board swap.


regards, -A
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Electroholic
Thu Jan 24 2008, 05:28PM
Electroholic Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
could it be thermal cycling problem with some bga chips?
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Conundrum
Fri Jan 25 2008, 10:40AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
This had occurred to me. I tried freezing chips and so far no sign of anything bad. It *looks* like it may be related to the panel itself but I won't know for sure until I try opening up the shielding over the connector.

Apparently this is a common problem with Samsungs, usually it isnt this bad though (random dots not continuous snow). One thing I did notice is when it switches modes vertical bars of the screen look perfect, interspersed with bad areas, then the whole screen goes fuzzy. Maybe a clue?

I've had a TFT monitor do this before as something heated up.

regards, -A

btw to add an incentive, if anyone can give advice that get this beastie going I'll send them an HV parts goodie box :)

This also applies to that g**dam Philips plasma that I have here with the "starts for one second then shuts down" fault.

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Dr. Dark Current
Fri Jan 25 2008, 10:55AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Conundrum wrote ...

This also applies to that g**dam Philips plasma that I have here with the "starts for one second then shuts down" fault.

We had this problem with a CRT TV, it was a bad capacitor in the power supply (some ceramic I think).

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Conundrum
Fri Jan 25 2008, 07:01PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
interesting.. /me goes to try this.

Can you remember which capacitor it was?

regards, -A

"Bother" said Pooh, as the wormhole crushed him into neutrons...
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