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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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Backlight Inverter Repalced still not working


dim the lights in the room, turn on the set, and shine a bright flash light on the screen. Do you see a faint picture? Also be advised that there are a lot of bad parts floating around on EBay. No backlight condition could be cause by a bad main board, power supply, inverter board, high voltage short on the inverter output, or a bad backlight bulb.

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Have a vizio 42plasma about 4yrs old. a lil bit ago i started to get red an green flashes thru the pic then the other day i herd a pop an the screen went black. when i turn it on now the pic/image comes...


The main tv Tuner signal board is dead.That the board,where the incomming broadcasting signal cable plug into it.Try website like Ebay.com to buy a refurbish tv Tuner signal board for the replacement.

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Black screen


You may either have bad DC filer caps for the 12~18vdc power supply section that supply the power to the backlight inverter board, or the inverter board is bad, worst case will be bad lamps. Check the 12~18vdc first.

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Jun 25, 2010 | TruTech PM1919BXA1 19 in. LCD TV

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Black screen no video no audio suddenly now


This set is a 50" plasma. first check the AC power fuse on the filter board then: if it is bad: check the power supply by marking and, removing all the cables; (so you can put them back in the correct spot) except the filter board to power supply cable; that connects to the Power supply board. Then: replace the blown AC fuse and, re-power: If the power supply blows the fuse: again, the power supply is bad and, must be replaced or, repaired. If the fuse does not blow: turn off the set then: on again, reconnecting and, disconnecting each board cable in turn, untill the fuse blows again this cable leads to the bad board; replace or, repair the board that blows the AC fuse every time the bad board is connected, irregardless of which other cable to the power supply may be connected also; or, not.

Jun 05, 2010 | Toshiba 50HP66 50 in. Plasma Television

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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.

Dec 16, 2009 | Vizio VX32L Television

2 Answers

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.

Nov 17, 2009 | Proview PA40JK1A 40 in. LCD Television

1 Answer

Tv screen went black and no sound


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.

Sep 25, 2009 | Audiovox FPE3206 32 in. LCD Television

1 Answer

Sound only with a black screen.


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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1 Answer

Black screen on my hitachi ultravision 55 inch plasma tv


With a black screen, it could be any number of things. You cold have a bad Y sustain brd, Z sustain brd, digital brd, etc. As the tv powers on it develops turn on signals to the power supply. If there are any bad drive boards, these signals will not be developed thus not allowing the power supply to fully energize. This repair will probably require a qualified technician.

Nov 26, 2008 | Flat Panel Televisions

3 Answers

Westington LTV-27w7 HD black screen


ICheck the power supply connections make shure tht the plugs are seated correctly. The power supply isreplaceable as a complete uitand you have to return a repairable unit.
loumargo
Allied electronics
loumargo@verizon.net

Dec 25, 2007 | Westinghouse LTV-27w7 7 in. LCD HDTV

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