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Replaced caps on the psu / inverter board, but backlights only power up for 2 seconds and then off. The LCD is powered and can see it just faintly. I have replaced the backlights, tested them on a test inverter board from a different monitor and they work. Any Ideas?
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This does not seem to be a power supply issue but rather an issue with the backlight inverter board. When the screen goes black, take a flash light and focus it on the screen from a close distance and several angles. See if you notice a very faint image. Try changing the channels to make it more noticeable. Try it and let me know
That is often an inverter failure. Try turning off the room light, and point a flashlight sticking to the dark screen. If you can see a very faint picture, then the inverter has failed. Before replacing the inverter, the PSU must also be tested. If the PSU does not supply power to inverter, then the PSU and not the inverter is the part to be tested.
If the screen is not dark, but there is backlight and no picture, then the problem is not the inverter. In that case check the source and the connection cable. If the cable is OK, then it is usually the main controller board inside the monitor. Once again the part must be tested.
What do you mean you replaced the video card? that is impossible, you would have had to replace the whole mainboard.
Okay you replaced the inverter, I suppose it was a tested and known good condition working inverter? does it work on another machine?
The lcd display, same with inverter? Has it been tested that its backlights work properly?
Then aslong as the small cable between mainboard and inverterboard is connected properly, it should work. But if it does not you have 3 possible causes.
1, Faulty display backlights 2, Faulty inverter board 3, bad cable / inserted wrong or motherboard is not providing the required electricity to the inverterboard.
This might be a sign of a faulty LCD cable or screen inverter board. The
LCD cable transfers data signal from the motherboard & video card
to the LCD screen. It also supplies high voltage DC power to the screen
inverter board. The screen inverter board works as a power supply for
the backlight lamp mounted inside the LCD screen. It converts low
voltage DC power to high voltage AC power needed for the backlight lamp.
Ur LCD inverter backlight board is dead.Replaced this LCD inverter backlight board.U will get ur picture back.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter backlight board for the replacement.It a long board in shape.
Ur LCD inverter backlight board is dead.Replaced the inverter board will get ur picture back.It a long board in shape.Tries Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter board.
Its Your lcd control board or inverter boards causing this problem. Either board(s) need to be replaced, if the LCD control board developes a fault condition it will cause the inverters to strobe which in turn causes the backlight lamps to flicker .... if the dc-to-dc converters on the inverter board or series resistors open up this will also cause the same affect.....
There are a few things that can cause this fault, but the most common is the High Voltage Capacitors that feed the backlights going bad. The invertor and power supply are on the same board (Vestel 17IPS01-2)
The caps are on the power supply board and are C355 & C356 (12pf 3kv) and C354 (4.7pf 3kv). If you replace these caps it will solve the problem in 99% of cases.
If replacing these three caps do not solve the problem then it may be easier to replace the power supply board... as fixing means replacing a tiny surface mount chip with loads of legs.
WARNING: The Power Supply/Invertor board can contain LETHAL VOLTAGES even when turned off and unplugged. if you are not sure, Pay someone to do it for you!
Your inverter board is bad. They run anywhere from $30 - $80. They are very easy to replace. I have had this problem with three monitors and replacing the inverter board fixed the problem. Hard to say where you will find the part. Just do a search for 'inverter board' with your model # on any search engine.
Good Luck!
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