Question about HP Pavilion F1503 15" LCD Flat Panel Monitor

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Screen flickers, turns on and off

When tested the monitor originally appeared to function correctly. I was turning the contrast up (holding the button) when the screen turned off. When the image came back (a few seconds later) the screen was flickering (like a CRT on a low refresh rate) then started turning off then back on every few seconds.

Upon disassembly of the monitor it became evident it had been repaired previously. Two legs on the transformer have been resoldered, presumably due to the common dry solder joint problem i've read about on this board. The two capacitors (C111, C112) that lead directly to the backlight power ouputs have either been resoldered or replaced. The capacitors currently in place both read "22J 3KV". There doesn't appear to be any dry solder joints present on the board.

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Normally this kind of problem needs only the dry soder, cause theres some loose components some where on the main board. Try to resolder any visiual suspicious terminals of components.Try to see carefully if any of the capacitor has any buldgy appearence on top of them. If there is try replacing them.cheers

Posted on Nov 23, 2008

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Hi, My name is Kevin and I may suggest that the inverter be replaced. Usually when you replace the tubes the inverter should be replace also. It is hard to find replacement parts for some of them but they do make universal ones that work with most monitors. Now we need to know if it is bad or the tubes are now bad. The tubes last on an average of 33,000 hours. They are not easy to replace if you have never done this before. Here is a link to the same type of solution. When you get to the tubes they will be black on the ends like a normal florescent bulb if they are bad or hook them ut to the new inverter to see if they light. http://www.fixya.com/support/t859266-koss_kld2700_lcd_tv_no_picture All lcd monitors work somewhat the same , as I can see from your measurements , you seem to now something about electronics so you can try this yourself. It will cost about $50.00 to DIY or $100.00 for someone else.
I have purchased from the site in hong kong and lcd parts.com and they are reliable. You can take the screen apart , on the top and bottom of the LCD you will find encased in a aluminum frame a long cf tube that looks like a long tube florescent light bulb but the thickness of less than a ball point pen refill and averages in lenght of the screen size. They are VERY fragile and does not take much to break in half.....I hope you can get it going again and as always you really feel good when you do it yourself. You learn allot about it . I know purchase only Samsung with the built in LED lights , last longer then the tubes by far . When you tear into the monitor, set up a static work station with a wrist strap and plenty of light , paper, pens, notes and even take step by step photos works well. Good luck and I hope this helped you some.
Kevin

Posted on Nov 23, 2008

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