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Power supply problem

I have a 42plasma with a bad power supply. Screen was just black when I turn it on, so I was advised to get another power supply. I did and just swapped them out and now I am getting a real dim picture.

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Power supplies, while one of the most unreliable Asian electronic assemblies, generally are OK when new,

The previous supply may well have failed because of a more serious internal problem, likely related to the high voltage supply plasmas need.
Your new supply may fail very soon if this is the case and you will need a hands-on tech to diagnose the problem.

Posted on May 29, 2008

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Black screen no video no audio suddenly now


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Sounds like a bad LCD Power Supply... once warm is shut off... I'm not qualified to fix or advise... but this should point you in the right direction...

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I have a Vizio VX32L and when I turn it on the screen flashes and goes black. The power light comes on and the vizio sign lights up and turns white. But the screen flashes real fast and goes black again.


There are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
Parts: http://www.shopjimmy.com/catalogsearch/result/?q=Vizio+VX32L+
Please post back what you find.

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ProView PA40JK1A screen just went black one day.


No, There are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find.

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Look at the power supply first; look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find. It sounds like at least you do have the 5V standby power supply working but the main supply is not getting the 'ON' command from the main board, or the power supply is gettin ght e 'ON' signal but failed to turn on.

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The only problem that causes the power on and off is a bad power supply. Go onto http://www.ebay.com and search for the monitor (power supply). My dad's old LCD screen had a bad power supply, but I found my old printer power cable (HP PSC 750 All-in-One Printer), and the monitor turned on successfully. It's not a bad monitor, unless the PSU hookup is like the PC ATX/Baby-AT PSU cable, then it might be the issue. Monitors before 2004 or 2005 have the ones, like the HP PSC 750 uses. The monitor is either defective, or the power supply is dead.

p.s.: check the voltage, amp usage, etc. on the PSU for the monitor for better results.

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sounds like the backlight is out, can you see a picture when shining a flashlight on the screen. if yes you have either a bad inverter power supply or bad screen (panel).
both are serious , also could be just a few bad capacitors on the power supply, if you want you can do a visual of the power board caps will appear swollen on top and are easy to solder in if you have a soldering iron

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