Question about HP f2105 21" LCD Monitor

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My 3 years old hp f2105 got the prolem: the power

My 3 years old hp f2105 got the prolem: the power light dose not come on no matter what.

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If this monitor has an external power supply "brick" like a laptop does then you need to test it for power output and replace it if needed. If it has just the typical PC power cord plugged into a 3 prong socket in the monitor it will be an internal power supply failure. About 3 yrs old is about the right time for it possibly to be bad electrolytic capacitors. If you have the skills to open the unit where you can see the internal boards (please unplug the unit while it's open to prevent electrical shock) you need to look at the little can shaped parts, usually with an X or K stamped into the top. If the tops are perfectly flat they are probably ok but if they are swelling up or are split and leaking a small brownish or whitish compound (dont wipe it with your finger, I have no idea what's in that leakage) then you have the problem - bad capacitors. You will need to replace them or have a shop replace them. Ideally the same uF (microfarad, measure of capacitance) and voltage rating should be used as well as the same size as most dont have much room but you can substitute with a higher voltage rating. If a capacitor is a 1000uF 25V you can use a 1000uF 35V but dont use a 16V. Many people have used close to the same uF rating and been ok but remember an electronics engineer specified that capacitance for a reason when he/she designed the circuit so it's best to use the same. Caps with both leads on one side, typical of board parts, are called radial and ones with a lead out of each end are axial. Places like Digikey, Mouser Electronics, Jameco and others have them listed by uF, V and size. Some more common ones are still stocked at Radio Shack but I prefer to use better quality at lower prices. If anything a local TV shop may have parts on hand they can sell you individually. Alternative is to replace the bad board as an assembly, or replace the monitor which is what the manufacturers want you to do so they sell more.

Posted on Jul 16, 2010


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On off button is broken on flat screen monitor f2105

Beverly, F2105 unit will need to be disassembled and new momentary tactile switch soldered in. Check out ALL the different styles and sizes to choose from at !!! at least 16 pages of switches to choose from. Then you will need a soldering iron, solder wick, solder, and know how to disassemble unit to replace a $2 to $6 switch. If contracting out the work to competent technician your looking at minimum $45.
Forget fixing the plastic button. Crazy-glue only option there.

Sep 20, 2010 | HP f2105 21" LCD Monitor

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Please check the voltages as shown in the pictures:

Alos look to see if there are any caps with leaking/bulging tops.

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Hp f2105 monitor works for about 1 minute and then blank screen. turning the monitor off and on again brings back the screen


It sounds like you have a monitor with a common problem. After a few years some LCD monitors will blow a power supply. The problem is caused by parts called capacitors overheating in the confined space of he monitor. If you are good at electronics repair/soldering you can usually fix he problem. Check out a few pictures on my web site You can take the back cover off your monitor and look for the bad parts,replace any that look like the pictures and your monitor should work fine. The capacitors do need to be installed with the correct + and -connections, note the stripe on the old one and insert the new one the same way. If you don't want to try the repair yourself we offer a repair service for $45 plus shipping. If your problem is not the capacitors then it would be the backlights and that is much more difficult to replace.

I hope this helps, if so please rate my solution.

Corporate Computer
Over 21 years of computer and printer support/repair

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Hold down the menu key on the monitor for 10 seconds. Should get rid of the lock.

My associate is an HP repair tech for 4 years.

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