Hi! I've got a problem... My LCD monitor is a Dell E151FPp, and does not power on. I opened it and found a shortcut in the power board. I replace the transistor STP6NC60FP and the integrated circuit L5991, that's where the shorcut was, I have already checked all components but even when I did it, the board does not give me any level of voltage in the outputs, it does not work. What could be wrong?? Help me please! I'm desperate!
Did you check the fuse PF751, it should be less than 1 Ohm?
Also look for cold solder joints.
http://s807.photobucket.com/home/budm/allalbums
Can you please provide good pictures of the board, there are so many different version of the boards, my email is [email protected]. Not very likely to be the main switch mode power supply transformer. We need to find out if the problem is in the Primary side (main AC that converted into DC (about 170vdc) and converted back to AC to feed the main switch mode transformer.
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SOURCE: Power Board Dell E151FPp
Check these links:
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.lcdrepair.us/e151fpp-pwr.html
http://www.electronicrepairguide.com/dell-E151Fpb-lcd-monitor-repair.html
Service manual: http://elektrotanya.com/?q=showresult&megnev=dell&megnev2=e151&kategoria=&kat2=all
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
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Yes, I've already done that... Everything is ok.. Well, it does not work, but about what you said, yes, everything is ok XD.
Now, I've found there is current just in the first part of the circuit, from the AC inlet to the second transformator, but after that, the board is dead... Could the transformator be wrong? Or the optocoupler?
BtW... Thanks for your help!
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