HP F1503 Backlight won't stay lit.

[Chickenfloss]

I bought this smaller monitor for $2 hoping to use it as a dual display. It worked for all of 5 minutes then the screen went off, but monitor stayed powered on. No standby etc. Held my phone's light up to it and the screen is still on just no back light. If you shut the monitor off then back on they light up again but almost immediately shut back off. This also happens if you change the monitor's resolution. You see the screen for about 1 second and then back to no light.

I was hoping a capacitor just blew on the inverter, but they look fine to me. I'm very new at electronics and was hoping someone could walk me through some steps to take. I have included pictures, hopefully they are of good enough quality.

[budm]

Re: HP F1503 Backlight won't stay lit.

Try re-soldering the Three TOROID Chokes, you have to remove the old solder first, the failure is due to contamination on the legs of the TOROID. Very common with this 15" and the 17" version.
http://s807.photobucket.com/albums/y...HP/HP%20F1703/

Try that first.

[Chickenfloss]

Re: HP F1503 Backlight won't stay lit.

I appreciate the quick response. I gave it a try, removed all solder from them, replaced with some 60/40 rosin core and same thing still happening

**EDIT** I've read the glue on the Toroids(on other models) is known to eat through traces. Is that a known problem for these?

[budm]

Re: HP F1503 Backlight won't stay lit.

This monitor uses 12vdc adapter, you have already verify that its output is steady at 12v with load?
Brown glue problem will eats copper traces.

[Chickenfloss]

Re: HP F1503 Backlight won't stay lit.

*epic face palm* My multimeter had an accident with a drunk group of nerds and a taser so to test the adapter I just used another I had of the same output. After reading your comment I thought well, I will just give it a shot. 3rd adapter same model and output as the first one I tested worked. Turns out I have 2 faulty adapters... So much wasted time haha thanks for the help everyone. I appreciate.

[budm]

Re: HP F1503 Backlight won't stay lit.

Good to be simple problem.