Question about HP Compaq 1825 18.1" LCD Monitor

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Power light is ON when i turn it on but LCD Screen is black.

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Just to be sure, try it with another PC first, if it still does not work then you will have to inspect the power supply section first for bad caps, then also look for cold solder joints, bad transistors, etc. worst case will be bad lamp assemblies.
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Please post back what you find.

Posted on Sep 04, 2010

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Posted on Jan 02, 2017

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hi,
You have to check the back light of your lcd monitor. All lcd screen have a back light to illuminate the pixels. you can conform is the back light is faulty or not by watching the lcd screen nearby. Watch can you see any image (negative image) on the screen. you have to look very closely. if you see any image on the screen then the back light or the back light inverter is faulty.

You have to check the back light inverter board. Normally in lcd monitors you can see three circuit boards. power supply, mother board, and the inverter board. If available then try to replace the inverter board. There are high voltage transformers in this board. There is a chance for its winding get short. You will not get the transformer in open market. Try for the inverter board .
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