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50L1400U going dark at bottom half of screen - Televison & Video

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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board...

Posted on Apr 29, 2017

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6ya6ya
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Posted on Jan 02, 2017

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I have a 75" Samsung LED TV, and the top position of the screen is going dark, is that a power supply issue?


Samsung TV half the screen goes black or dark - YouTube

? 0:38
www.youtube.com/watch?v=Mmu5wq6LVgM
Jan 28, 2012 - Uploaded by DaReal2Face
Samsung TV half the screen goes black or dark. ... My samsung 40" - 14 months old does this on the top half of the screen. .. ****** 12 month ...

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my friend,your prossesor is not working the way it should be,thats why your half of the screen is dark and sometimes goes off, bring it repair shops and there'll get it fixed.

cheers

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1 Answer

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screen back light on the other side is busted which need replacement.

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If it has been happening slowly, it is likely from the decay of an electrolytic capacitor.
If it happened suddenly, something else in the vertical deflection section has gone bad.
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My new TV LCD Samsung LC32C530 Series 5 has one half darker and with less contrast than the other.This is noticeable now always. There is a distinct and clear division down exactly half the display which separates the dark and light sides.. Any ideas?Thank you.

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Those are the symptoms when the power supply is giving up.
Unfortunately there are not many replacement service parts around to swap the power supply assembly, but It will need to be fix to the component level instead.
I service these power supplies.
Let me know if you need more assistance.

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1 Answer

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1 Answer

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Thanks for the picture - that's a big help.
It looks you have the dreaded light tunnel collapse common to all LG1.gif DLP TV's. Inside the light engine there is a square tube made up of four mirrors. These mirrors deform and crack with the heat of the lamp. They fall down over the light aperture and cause a shadow of varying degrees. It is fixable now at a realistic price ( used to have to replace engine) as LG have made the parts available. It would take a competent tech around three hours to complete or if you are technically minded you could do it yourself. I hope this helps.
Hope Ya Fix It!

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