I have a e152FPB monitor which doesn't work. The screen flash white once for 1 second after turning it on, and then nothing. The led is always lightning green, with no flashing. I've opened it and check the voltage on the back light power: about 180V when flashing, then nothing. I think the problem is that the power of the backlight isn't reliable.
Do I have to take transitors away? How can I be sure they are in bad or good condition?Thanks for helping.
Yes, it's this board.
Do I have to take transitors away? How can I be sure they are in bad or good condition?
In fact my board is very similar but not exactly the same. It is exactly this one: http://electronicrepairguide.com/dell%20...In fact my board is very similar but not exactly the same.
It is exactly this one:
http://electronicrepairguide.com/dell%20e152fpb%20inverter%20board.jpg
In fact my board is very similar but not exactly the same. It is exactly this one: http://electronicrepairguide.com/dell%20...In fact my board is very similar but not exactly the same.
It is exactly this one:
http://electronicrepairguide.com/dell%20e152fpb%20inverter%20board.jpg
If you have the same problem with this screen, check the fuse PF751. If there isn't about 0 ohms, replace it: there are chances it will solve the problem!I replace the fuse PF751 as said in this page:
http://www.electronicrepairguide.com/dell-e152fpb-lcd-monitor-repair.html
And the screen is back to work!
If you have the same problem with this screen, check the fuse PF751. If there isn't about 0 ohms, replace it: there are chances it will solve the problem!
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If you see power lights but nothing appears on the screen, it could be a "POST" (Power-on Self Test) problem or simply LCD problem.
Here are some steps that you can try. One of these may work on your case.
1. Remove the battery and the ac adapter then press the power button for at least 20 seconds to drain electric charges left on the system. (You may need to repeat this step to get it work.)
2. If above step doesn't work, try to plug in an external monitor and see if you get display from the external monitor.
3. If you get display from the external monitor, I'm sure your having problem with the LCD components. In this case, check and replace faulty LCD backlight, LCD cable or LCD inverter. The LCD inverter is often a culprit.
4. Try to reinsert the memory module/s (RAM) of the unit, try using one RAM at a time to see if it works. A faulty RAM will cause the laptop not to POST.
5. If reinserting the RAM doesn't help, most likely your motherboard needs to be replaced.
The backlight controler board is faulty. You can try replacing any capacitors in this board even if they look OK. If this does not work then you need to replace the inverter board with a universal inverter board - you will need to work out the wiring details though.
It is standby mode, no signal, It is possible that your computer is not POSTing.
Connect your screen to another computer/laptop, just to make sure, which component is not working. Either the Screen or the Computer.
Make sure the DVI/VGA cable is firmly connected as well as RAM modules and Graphics Card.
Please take the time to rate my expertise.
Thanks
dhowie, Monitor will need work done to internal "switch-mode-power-supply"/"CCFL inverter supply board. possible bad electrolytic filter capacitors or thermally intermittant component soldering on printed citcuit board. Your CCFL back-lit LCD display no different than any other brand in it's basic design and operation. Spend an hour in my fixya profile reading about black screen and blank n black screen stuff. Then you will know what you will do or not do to solve V71LCD problem. Follow the links to other sites for more info here on fixya and elsewhere. I will check for response from you at this same posting later.
12fixlouie
Sounds like your inverter or your backlight is failing. The inverter is an easy repair, the backlight can be replaced but it involves taking the LCD panel apart, The backlight comes installed on new screens. I can include a service manual below and possibly a generic guide to backlight replacement....
The backlight or inverter may be bad. With the monitor on and the room dark, hold a flashlight very close and shine it on the screen . If you can see the normal display the monitor is OK but the backlight or the inverter which provides proper voltage to the backlight has gone bad.
From your description your backlight is going out. The fluorescent light when it begins to burn out tries to draw too much power. Your inverter is sensing this 'too much' power draw and shuts down power to the back light. Replacing the backlight is the most technically difficult repair of an LCD, and most repair shops don't even offer this service. I recommend that you sell your LCD 'AS IS' on eBay or a similar website. The Power board and the Control Board are both usable parts that can be easily salvaged from most Dell Ultrasharp monitors.
Thanks for helping.
Yes, it's this board.
Do I have to take transitors away? How can I be sure they are in bad or good condition?
Thanks for helping.
Yes, it's this board.
Do I have to take transitors away? How can I be sure they are in bad or
good condition?
In fact my board is very similar but not exactly the same.
It is exactly this one: http://electronicrepairguide.com/dell%20...
In fact my board is very similar but not exactly the same.
It is exactly this one: http://electronicrepairguide.com/dell%20...
I replace the fuse PF751 as said in this page: http://www.electronicrepairguide.com/del...
And the screen is back to work!
If you have the same problem with this screen, check the fuse PF751. If there isn't about 0 ohms, replace it: there are chances it will solve the problem!
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