Re: Dell E172fpb
Those blue high voltage capacitors say "27J 3KV" Any idea where I can find a few of those?
Also, if the transformer was bad would there be visible evidence?
juane414
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Last Activity: 05-30-2008, 01:05 AM
Joined: 05-08-2008
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Last edited by juane414; 05-24-2008, 10:28 PM. -
Re: Dell E172fpb
Actually I didn't re solder anything other than what I replaced. I will get a new high voltage capacitor to replace that blue one and replace those two burnt out transistors and then re solder everything again. If it goes out again then I'll assume its a transformer.
BTW thanks for all the great help guys...Leave a comment:
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Re: Dell E172fpb
I'd say! Well, physically, that blue capacitor looked to be fine before replacing the transistors. So if the transformer is bad, why didn't it kill that capacitor before and what made it die this time?Leave a comment:
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Re: Dell E172fpb
I just noticed something new... Check this out.
If you look at the blue thing circled in red, you'll see that its bulging badly compared to the others. The transistors that died are circled in blue, and are slightly browned from shorting. What do you make of the blue thing?
Would the transformer right next to that be the bad one? It seems that each transformer has its own blue capacitor thing.Last edited by juane414; 05-24-2008, 02:13 AM.Leave a comment:
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Re: Dell E172fpb
how do i know which transformer it is, and where do i find one?Leave a comment:
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Re: Dell E172fpb
Well I opened it up again and it looks like 2 of the transistors that I replaced burnt out already. Any reason why this would happen? What else could have caused the transistors to fail so suddenly?
The transistors that failed again are circled in red....Leave a comment:
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Re: Dell E172fpb
hmmm... my monitor actually just fried itself i think. Image faded out, smells like something melted... I'll have to check it out.Leave a comment:
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Re: Dell E172fpb
Well, I originally replaced the 4 lower transistors, but there seemed to be no change in the original problem of the monitor. It would light up briefly to display "BenQ" and then briefly again to display the image of the desktop before going off indefinitely. So, I figured remaining top 2 transistors were bad, and after replacing those the monitor lit up and stayed on.
I'm assuming its the smaller driver transistors that are bad.Leave a comment:
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Re: Dell E172fpb
yea they are C5707
I also just realized that the capacitors I used were 85C, while the originals were 105C... They might not last long
that wouldn't cause the problem would it?
Last edited by juane414; 05-23-2008, 03:27 PM.Leave a comment:
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Re: Dell E172fpb
Interesting, thanks for the information krankshaft! I will look into replacing those as well. Its annoying having to unplug the monitor when I'm not using it.
Here is a shot of my inverter board. Its actually a BenQ monitor, not a Dell, but the inverter board is similar to the Dell boards I've seen. I replaced SIX transistors, which are circled in red. I also replace two capacitors that were bulging.
Krankshaft, can you tell me which MOSFETs you are referring to in this picture?...Last edited by juane414; 05-23-2008, 03:21 PM.Leave a comment:
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Re: Dell E172fpb
Well, after replacing the bad transistors the monitor works again. But after I turn it off the lcd goes off, but the backlights stay on. Anyone know what would cause this?Leave a comment:
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Re: Dell E172fpb
Hey all,
I'm new to these forums but have some questions. I have a BenQ FP757 that I saved from a dump heap at college. I does the same on for 2 seconds off again deal that the Dell's do. The power/inverter board in this one is extremely similar to the one in the Dell monitors. I was thinking about replacing the transistors and two capacitors that are bulging, but I noticed that this board actually has 6 transistors. Should I replace all of them? Also the capacitors are 470uF 35v and 105C. Where is the best place to get a couple of those?
...Leave a comment:
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