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I have a 65" lg plasma tv and I recently replaced s few capacitors that were bad and the tv worked beautifully, yesteddy morning I was watching and suddenly the tv went dim and fuzzy like snow but I still had colol and a fuzzy picture? This darkened fuzzy picture stays on all inputs, channels etc., so must be internal? Any advice?

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Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
After replacement of the power board, Va&VS voltages are to be set according to the silk screen; can be located at the display panel, and it is a must for plasma displays.

Posted on Nov 06, 2014

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SOURCE: 42 inch LG Plasma TV - Lost picture

sounds like it may be a software upgrade

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SOURCE: 42 inch LG Plasma TV - Lost picture

ysus pcb that supplies voltage to the panel is faulty

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SOURCE: 42 inch LG Plasma TV - Lost picture

Our LG 50" plasma tv screen went black after a popping noise but still had sound, after great diliberations decided to take the back off and have a peek!
We unplugged the tv and tested the fuses (there were three we could see) one had blown, the one on the left as you look at the back of the tv it also has one above it. We wrote the code/seriel number down and took the fuse to the electrical wholesalers Maplin and bought a pack of 10 fuses for £1.29 replaced the fuse in the tv and everything now fine!!!!!!
Hope this might be of use to anyone whose lost the picture after a loud popping/snacking noise but still has sound.

Posted on Jan 17, 2008

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SOURCE: Samsung plasma all black screen

Black Screen come from three areas. 1- Power Supply Board 2- Inverter Board 3- Processing Board on the LCD. Since the Power Supply Board was replace, it easy to troubleshoot where the problem. lies If you cannot get the backlight, then its the inverter board. If you can use a flash light on the TV screen and can barely see the images, then the problem is indeed the inverter board. If you cannot see any images when using a flash light, then the problem comes from the LCD processing board. Let me know if you have any success. Mike

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SOURCE: Sanyo Vizon 42' Plasma TV has lost its picture after 2 years

the bulb of your tv is dead. replace it

Posted on Mar 08, 2009

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I have an LG 60PV400 plasma TV. While watching TV the screen goes black but the sound keeps playing. Sometimes the sound will just keep playing. Sometimes the TV while shut off.


Hi Joseph

Not sure what the LED codes will be. LG Tech support would know.
Is it under warranty still? If so, then get it to a service centre.

If not, Then you might want to check for leaky Electrolitic Capacitors.
This is the biggest ploblem with modern Digital (computer) Flat Panel TV's
Might be a little early to spot the "Bulging" or leaking until it gets worse.
If your up to it & you can spot the bad caps & unsolder & replace for a few bucks.

Good Luck

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1 Answer

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If your LCD TV or monitor has stopped working, or is displaying one of the following symptoms, then it's a candidate for some new capacitors
- Flickering screen
- Screen image disappears after several seconds
- Dim screen
- Slow start
- Power LED on, but no picture
- Unusual colors and/or lines
The primary cause of LCD TV and monitor failure is caused by faulty capacitors. You can examine the capacitors in your LCD TV or monitor and actually see if they are bad.
If they appear bulged on top, then they need to be replaced.
New capacitors will solve a host of problems in LCD monitors and TV's and will extend the life of your monitor or TV by several years.
Check the cables, connectors and connections.
Take it to a repair shop.
https://www.youtube.com/watch?v=TR2iWN6b-LY
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If your LCD TV or monitor has stopped working, or is displaying one of the following symptoms, then it's a candidate for some new capacitors
- Flickering screen
- Screen image disappears after several seconds
- Dim screen
- Slow start
- Power LED on, but no picture
- Unusual colors and/or lines
The primary cause of LCD TV and monitor failure is caused by faulty capacitors. You can examine the capacitors in your LCD TV or monitor and actually see if they are bad.
If they appear bulged on top, then they need to be replaced.
New capacitors will solve a host of problems in LCD monitors and TV's and will extend the life of your monitor or TV by several years.
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This tv seem to have two problems.The problems that the tv take a long time the tv to turn on,the tv power supply board have dying capacitors most likely.That the board where the power a/c cord plug into it.The picture flickers badly this problems is harder to determine because this causes by two backlight buffers boards X,Z buffers boards could be either one it is dying.This tv should get an estamate by a shop or shops and repair it by them,bcause the tv must have to be doing replacing x munbers capacitors components to the tv power supply board and alot more work to trouble shoot and to detrmine which of the buffers boards it is the causes of to the picture screen to be badly flickers and replacing it.

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Hello,

The problem is that there is a bad capacitor inside the unit, it is either on the main panel or the power panel. The popping sound you got was due to the fact that the lead on the capacitor was bridging, therefore causing some electrical popping sound.

Run a check on the main panel and the power panel for any bad capacitor and replace it with a new one. That way, your television will be in good condition once again.

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