TVs & Home Theaters forum

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Samsung LCD LN52B750 Blank Screen

by richardcron / December 31, 2010 12:59 AM PST

The TV was about 1.5 years old, started screen would blank after 20 minutes or so, sometimes not until several hours of viewing. Only way to regain picture was to power off and back on and then usually it would be okay for another twenty min or more. Sometimes it would take several power cycles to get picture to stay on (you would see the input mode flash briefly in the upper left of screen). If the room was dark you could see that the fluorescent backlight was shutting off. Audio was always okay and acted same for any input. I had ordered a service manual and when I received it, the TV mysteriously started working fine and had for a couple months. Now it won't even power on normally. Just get audio and sometimes a brief flash of the picture and then black.

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This may be good news.
by R. Proffitt Forum moderator / December 31, 2010 10:27 AM PST

If you read the Cnet Samsung forums many are reporting one time free fixes for the bad cap plague.

PLEASE UNPLUG THIS SET TO AVOID any further damage.
Bob

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Which thread?
by richardcron / December 31, 2010 10:38 PM PST
In reply to: This may be good news.

I saw several in the Samsung forum referring to older models with slightly different symptoms - clicking, etc. One or more with my symptoms replaced capacitors or the whole power supply with no fix. The closest I think spoke of replacing the backlight controller or inverters...?
Thanks for the reply.

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Sorry.
by R. Proffitt Forum moderator / December 31, 2010 10:48 PM PST
In reply to: Which thread?

But the idea is to call it in and hope for an out of warranty one time fix. I had hoped you would follow other folk's lead as to this. Again, make the call to 1800SAMSUNG or for your country and get that all important transaction number and post your issue in the Cnet Samsung forum if you don't get too far.

At 1.5 years that's pretty close to the edge of the stock warranty even with the (sometimes) 3 months extra you get for registering the product.

Good luck,
Bob

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Update
by richardcron / January 3, 2011 7:41 AM PST

I removed the back cover, powered it on and was working okay. Removed power, reseated all interconnecting cables, powered on, second day still working with back cover off.

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Worked FINE for ten days, now back to blank screen.
by richardcron / January 12, 2011 8:39 AM PST

Worked for ten days after I removed the back cover. Now its back to blank screen, audio is still okay.

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Seems like leaving it off for atleast 24 hours
by richardcron / January 13, 2011 7:17 AM PST

Leaving it off for at least 24 hours with power cord unplugged and then a couple tries and it usually works again for a while - days. ***?

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