LCD Monitor Repair DIY Question

May 18, 2010 at 00:06:34
Specs: Windows XP Pro SP3
I'm trying to repair my 20" Fujitsu/Siemens ScenicView P20-2 LCD monitor. It seems to have just quit. Tearing it apart, I found a blown fuse. I replaced it and, pop, another blows. So, I found a ceramic capacitor with a short circuit. I replaced it and now when I turn the power switch on, I get a faint clicking from the DC Transformer which coincides with the power LED on the front, which blinks. Checking the output voltages, I'm getting roughly 4.5V at the 5V output and anywhere from 4-9.5V at the 12V output. It seems like the components are trying to power up, and then run out of power, and the cycle starts over and over again. I ran 12V directly to the inputs on the Digital/Analog board, and the CCFL's light up, but nothing else. (Mind you, I wasn't pumping 5V or any other signal into the board)

I've checked for leaking and bulging capacitors, but haven't found one yet. I've changed a few out that I had on hand. What would be the next step to diagnosing this problem? I'll be recapping the whole power board later this week... Could the problem be with the transformer? Thanks, Nick

Happy Trails

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May 18, 2010 at 12:57:01
More likely you fried the voltage regulator/s. check the caps for shorts, if you don't find any shorts look at the voltage regulators. Are they simple 7805 and 7812 regulators or is it more complex than that?

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