Question about HP f2105 21" LCD Monitor

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Hp f2105 only stays of for 2 seconds

I recently found someone who was throwing one of these out so i figued i could fix it. it only stays on for 2 seconds and screen goes black. when you go to turn it back on again it does it again. and help me out. i could really use the moniter

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  • Rob Land Jan 22, 2009

    Monitor will come on for 2-3 seconds then shuts off. Changed the inverter board, Power Supply and the circuit board containing the switches, tried changing the video board swapped out the audio board. So every circuit board mounted on the back has been changed, still have the same problem. Does anyone have any ideas? Thank you

  • Rob Land Jan 22, 2009

    I have the same problem. I have changed all circuit boards that are visible with the back off. Inverter, Power supply, Video, Audio, and Switch circuit board. Any Ideas?
    Thank You

  • Lou Ebert May 11, 2010

    Hellrazin, look to see some of the stuff I have already written to others with same symptom of having lcd with <2second on time. then goes to black. First thing get the back off monitor. look for bad solder connections on top & bottoms of pwr supply and the cfl tube inverter board. goto web and search for FIF1942-02A Frontek Inverter to see typical example of 55Khz Cold Cathode Fluorescent 4 tube inverter board. look at solder connections under inspection microscope to check for frosted and or vibration caused fracture of solder to the throughhole component on top of can also go check photos of monitor boards at Jestine Yong's site. he only wants to sell ebooks for repair of lcd monitors, but you can look at the site and see some inverter bds & ac to dc switch mode pwr supply boards and learn names of some components that are on those boards. Also go to this web page.It's called www. ! Check out the tabs onleft side of screen. Hope you have some luck in finding out what exactly is the problem. I'm louie12fix at fixya other email address is lmistyrel@ BYE



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Hi there mate i have a hp f2105 with the benq power supply in it which as gone faulty could u look at your power supply and tell me the numbers on the power ic which is ic651 thanks.

Posted on May 02, 2009


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My hp f2105 monitor stays on for only 2 seconds and blacks out again how can i fix it?

The light comes from 4 luminiscent tubes. They are empowered by high-voltage power suppy. There is a circuit, that continuously monitor the lamps and the quality of the power from the low-voltage power supply. Either there is a faulty light tube, or there are inflated capacitors on the LVPS. First one is hard to repair due to need to open the LCD itself, which is hard and dangerous, the light tubes are hard to find and LCD is hard to clean perfectly when closing and appear dirty spots on the screen. The second one is easy - visually inspect the capacitors and if their top is not flat, then replace all of them with the relevant capacitance. I suggest to use capacitors for higher voltage (35V) thus making the PS lasting forever.

Apr 07, 2012 | HP f2105 21" LCD Monitor

1 Answer

My monitor won't stay on it will go black after a sec. If you turn it off then on the monitor will work for a second the it goes off again. I have unplugged cords and it still does it. I have a hp f2105

It is "normal" for a monitor to "go black" when it is NOT connected to a computer.

Connect it to a different computer, to see if the video-card on your computer has failed, and to see if the LCD monitor works at all.

Dec 15, 2010 | HP f2105 21" LCD Monitor

2 Answers

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

1 Answer

F2105 hp monitor went to sleep and cannot wake.

i cannot help you its either your moniter or the vga port at the back of you tower there the only things i can figue out

Jun 01, 2010 | HP f2105 21" LCD Monitor

1 Answer

It shuts off after 5 seconds

Is it connected to a computer?
If not, then it _should_ go to "power-save" mode,
and the lamp will go from GREEN to ORANGE.

If the lamp _totally_ goes off, then you have a problem with the HP monitor.

If it's still under warranty with HP, telephone HP, and get them to trouble-shoot and/or replace it.

Apr 03, 2010 | HP f2105 21" LCD Monitor

1 Answer

Hp f2105 21" LCD monitor "OSD LOCKOUT" how to fix it without spending any money

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.

Jun 06, 2009 | HP f2105 21" LCD Monitor

2 Answers

No light at all at the power button

You will need to check your cable as well as fuse inseide the monitor. Checking the cable will reuire certain electronics equipments.


May 18, 2008 | HP f2105 21" LCD Monitor

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