Re: Dell E172fpb

Just to give another update: I replaced the logic board and now it's fine. So I guess it was the logic board that was messed up, which was causing the hissing noise and stuff. Right now I'm just testing the monitor without assembling back to the case just to monitor temperatures. The Genesis chip gets hot but still ok to touch compared to my old one. Maybe I'll put a heatsink on it. The transistors are very hot to touch, but I remember that removing resistor R750 helps. Does it really lower temperatures? I don't care if the brightness setting doesnt work, but not...

Re: Dell E172fpb

Update: Upon testing, I just realized the logical board isnt working anymore. Upon turning on, I get weird display where it's all pink and random colors. After that it shuts off. The Genesis chip gets really hot to touch, so does that shut off the inverter board too? I just ordered another one but I'm afraid that will die too after a couple of testing.

Re: Dell E172fpb

Sorry for triple posting (cant edit post?) but when i measure the voltages on diodes like D761, I can see that the voltages slowly dropping.

Re: Dell E172fpb

Also is the Genesis chip suppose to be hot or warm? And now the Power button don't even respond, like if i want to turn the monitor off.

Re: Dell E172fpb

Yes. Let me give you exact details. So I plug the cord into the board while using my extension cord switch to turn the monitor on and off. Here are the results from my observation:

The green light shuts off after 30 seconds. 50 seconds after that, that hissing noise from that area. I switch it off and wait about a minute. Turn it on and the green light lights up for 13 seconds and the hissing sound will come shorty. It green light doesnt flicker either, like it did when it first died. The only hottest component I can feel without touching is IC701,...

Re: Dell E172fpb

So I found out the hissing noise is coming from the biggest transformer (T601), or along that area. I measured the resistance of the primaries and secondaries and it seems they yield no resistance? I was measuring the voltages at the 100uf cap (biggest cap) and the voltages are at 165V. I still get 400+V at teh CCFL connection but drops to 2V after a few seconds or so. None of the trannies get hot this time, so I assume no voltage are going through them. Are those voltages normal? Am I out of luck?

Re: Dell E172fpb

Hi! I attempted to repair this by replacing the 4 trannies. It worked for one day and then it died because Q759 is burnt and discolored. The other 3 is fine. So I replaced that one. When I power it up, it would light up but after about 10 seconds, it shuts off, including the green power button. While it's on I can hear a hissing sound from the board, not sure which part it is coming from. Also I measured the outputs for the backlight and it reached up to 400V??? That's not normal right? I also get no voltages at time for the 2 diodes (D751 and D761). None of the...