Question about BenQ FP71G 17" LCD Monitor

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INVERTER POWER CARD

Hi there,

Not too sure where in the U.S to get replacement transistors on this board. Are there any compatible transistors that can be used? Any ideas would be appreciated.

Thanks.

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You did not specify the transistor. But this site may help. You can download a quickcross reference software that will give you the replacement parts that you need.

http://www.nteinc.com/

Posted on Sep 15, 2008

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Hi doubles,
Power on the unit in the dark room then shine with the flashlight directly in the screen, you will barely see the images. This is because your backlight is not functioning. The following reason is the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This is caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board - even the B+ is good from the power supply, if the fuse, driver transistor, driver transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - even inverter board is good but if this is busted resulting to black picture also.
Diagnosing the fault is technical and if you don't have necessary tools and test instrument and can't fix it yourself, I would advice you to look for an experienced technician to isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

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An inverter board is an electronic circuit which boosts a low voltage DC current in to high voltage. It's used to power a CCFL tube in he television, which enables the backlight. The inverter, is composed of a MOSFET transistor, acting as a switch, an a coil, which boosts the voltage. The common high voltage output of the inverter board is around 800V.
If your inverter board has gone bad, you could replace the transistor and the coil in the board. This method is the cheapest option, but involves a lot of soldering and time. I encourage you to replace the whole inverter circuit, which is far easier, and not so much expensive.
You will have to take apart the television. Unplug the TV from the power outlet-wait around 8 hours to give time to the capacitor to discharge. Unscrew all the bolts of the back panel, and then, with a plastic tool-like a credit card- pull the back of the screen. After that, you will be able to see the circuit board of the TV. Then unplug the BUS cable and every CCFL tube connectors carefully-they are easily identified with a pink and a white cable. Afterwards, unscrew the fixing bolts of the board, and change it for the new one. You can buy a new one from ebay-the inverter is integrate with the power supply:
http://cgi.ebay.com/VIEWSONIC-9OC4100200-POWER-SUPPLY-FSP410-5F01-N5230P-/260574190024?pt=LH_DefaultDomain_0&hash=item3cab6e99c8#ht_2463wt_907
All you have to do now, is to reverse your steps. Connect each CCFL tube, put the back of the television on, screw the bolts and you are done.

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Hi there,
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If your inverter board has gone bad, you could replace the transistor and the coil in the board. This method is the cheapest option, but involves a lot of soldering and time. I encourage you to replace the whole inverter circuit, which is far easier, and not so much expensive.
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Then unplug the BUS cable and every CCFL tube connectors carefully-they are easily identified with a pink and a white cable. Afterwards, unscrew the fixing bolts of the board, and change it for the new one. You can buy a new one from ebay:
http://shop.ebay.com/?_from=R40&_trksid=p5197.m570.l1313&_nkw=32AV502R+inverter&_sacat=See-All-Categories
All you have to do now, is to reverse your steps. Connect each CCFL tube, put the back of the television on, screw the bolts and you are done.

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