Re: Dell 22" monitor backlight goes out right away.
I switched the lights and got the same results. Then I got some lights from a monitor that has a broken screen and plugged those in and still the same results.
indyracer
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Last Activity: 02-01-2012, 10:15 PM
Joined: 12-31-2009
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Re: Dell 22" monitor backlight goes out right away.
Yep, I am going to look for an ESR meter. That is the one that sounds like would be helpful with this.
TonyLeave a comment:
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Re: Dell 22" monitor backlight goes out right away.
The caps say Elite on them.
I think I will try to find a meter to test the caps. That sounds like something useful to have anyway if you do many of these monitors.
I will try switching the lights and see what happens.
Thanks,
TonyLeave a comment:
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Re: Dell 22" monitor backlight goes out right away.
Well, I tried to measure the voltage at the points suggested. I was measuring on the 20V DC scale for all of these. Point A climbed to .20 before the light went out and it settled at .15. Actually all points settled at .15 after the lights went out. Point B climbed to .20 several times and .18 a couple times. Points C & D went to .30 to .35.
My guess is it isn't getting to the voltage it should before the lights go out. So I guess the next step is to replace some caps?
Thanks,
TonyLeave a comment:
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Re: Dell 22" monitor backlight goes out right away.
Here is the updated picture.
Thanks,
Tony...Leave a comment:
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Re: Dell 22" monitor backlight goes out right away.
Okay, I measured the resistance across the legs of the blue caps near the transformers. The resistance is 474 for both.
Model number of the monitor is Dell E228WFPc
IC has the following on it:
83AREEM
TL4941 G4
I will attach a better picture shortly.
Thanks for all the help.
TonyLeave a comment:
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Dell 22" monitor backlight goes out right away.
I have another monitor that I am trying to fix. This is a Dell 22" widescreen and the backlight goes out about 1 or 2 seconds after turning it on. Usually I see caps that need replaced right away, but this one has no bulging caps. I am stumped on where to look to repair this one. Any help about where to start would be great. I have pictures below.
Thanks,
Tony... -
Re: Tyris Monitors turn on then shut off within 1 second
I will check for shorts tomorrow.
The part number on the transistors is C5706. I will have to get the number off the ICs tomorrow.
Part number on original capacitor is F .33J PMD 250V
Part number on replacement capacitor is F334K K 250MPP1.
I sent a picture of the original to Mouser and the replacement is what they gave me as a replacement.
I will get the other information in the morning.
Thanks so much,
Tony...Leave a comment:
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Re: Tyris Monitors turn on then shut off within 1 second
Thanks for the quick reply.
You are correct. When you power on the monitor, the screen and green power light comes one for about 1 second then go out. About 2 or 3 seconds later they come back on and the process just repeats until you unplug the monitor. I have pressed the power button during this process and the monitor stays off, but as soon as I turn it back on it just continues with the on off cycle.
I have attached a photo of the bottom of the board.
Thanks so much for your help....Leave a comment:
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Tyris Monitors turn on then shut off within 1 second
I have 2 monitors (same make and model) that started having the same problem in the same week. When you plug them in, they turn on for about 1 second and turn back off. They will continue to do that until you hit the power button or unplug the power cable. I took them both apart and the same capacitor was split down the sides. I have included a picture with the part circled that I replaced. After replacing these parts, both monitors still have the same behavior. What else should I be looking at? I can get more pictures if needed.
Thanks for the help..
Tony
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