20 Most Recent HP f2105 21" LCD Monitor Questions & Answers


If the lines are running top to bottom and are perfectly straight then your panel is failing.
The only repair is to have it replaced. It can be sent off and have the driver tabs repaired, but the sheer cost of that operation is far more expensive then a new monitor.
The next best option is to look for another monitor on a certain online auction site with a failed power supply and salvage the panel from that.
Even buying just a panel (new) will be more expensive or as expensive as a replacment monitor.

Sorry, it's just the way technology moves.
If it has any warranty left, then return it under that warranty. Most LCD's have a 3 year warranty, so it is worth checking up on. Look for the "Date of manufacture" on the sticker on the back of the monitor.

HP f2105 21" LCD... • Answered on Dec 11, 2018


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HP f2105 21" LCD... • Answered on Dec 21, 2017


this is not HP.com sorry, its a BULLsession blog, mostly guessing QUESTION TO YOU. no computer stated, 10000s exist, 1981 to now, endlessl.... we get you have a display connected to what>? who knows. I hate guessing but is display connected to a desk top PC? that it. so if you barrow and other display does it work ok? it has 2 cable (not power) one is DVI other is VGA which one are you using. ok i see your confusiong yes, the monitor has its one menu's and the bad designers dont tell you that, all pop up windows need to say who is talking to you in this case "F2105" is not in the window. geeks design it and this is what you get. even windows 10 does this inane acts,, it pops up and forget to say , I'm W10, only the blue color dark is the clue) so dont feel bad, its the lame geek disease there. what does this mean that you need o learn the buttons on your monitor one is to clear those screens its in the manual. best is dont use those buttons. if possible. on side of monitor the monitor has its own tiny computer brain that is helping you. avoid it. the button on most monitors (mine has 5) menu button,. press one to get menu press again to exit some have an exit button push it. lost your manuals>? hp.com has them, ask. http://support.hp.com/us-en your monitor has speakers, those need to be connected. to the PC. http://support.hp.com/us-en/product/HP-Pavilion-21-inch-Monitors/81806/model/461641/document/c00665777/ the screen box is called, clear it now using manuals above. On-screen display (OSD)

HP f2105 21" LCD... • Answered on Mar 10, 2017


Sounds like one of the front panel buttons is stuck in - possibly the volume down button. If no buttons work, this could be the reason why. Just a guess. If they all feel OK, it may still be worth pulling the back off, (Without electricuting yourself -DISCONNECT POWER!) remove the PCB board that has the buttons on it, and see if it turns on without the menu. If so, check all buttons, rare but I have seen one that looked fine but with a multimeter it showed it wasnt working. If the screen still displays the menu, Id say there is a bigger problem... HTH

HP f2105 21" LCD... • Answered on Feb 20, 2017


haha, been there. This ones a little tricky. Hope you have strong fingers. start by removing the base. There are 3 screws. First pull the base plate off. Then remove 2 screws. Next remove the little rubber insert in the center of the base bracket. You will need a long phillips to get to the 3rd screw. Slide out the base bracket. Flip the panel over and stare at the lcd with the buttons side on the top. Grab a small flat head screw driver. Look at an angle in each of the corners between the inner black lcd trim and the silver outside trim. There is a ****. Shove the flathead in there and pry outward toward the silver trim while lifting on the black inner trim vertically. The trick is to flex the black trim toward the silver and then pull up. There are 6 plastic snaps on the top and bottom, and 4 snaps on the left and right. If you've taken laptop screens apart, you'll feel the similarity.

Once you pry the black trim off the front. Disconnect the LCD Menu button assembly and power button. Then flip over the LCD and lift off the back shell. Looking at the back, remove the 2 connectors for the speakers. Use a small flathead to pry the 4 Inverter power connectors. These 4 connectors have a clip on them and are usually hard to pull out using the wire. Once thoses 6 connectors are removed, remove the 2 phillips screws holding the AC power plug to the case. Also remove the 4 3/16 posts for the VGA and DVI ports. Next remove 4 screws, 2 screws from each side of the LCD assembly. Hold the panel face down with the aluminum tape in the bottom left. Lift the shield and guide the 6 wires through the cage. While opening, look inside and disconnect the flat ribbon cable as soon as you can. Put the LCD to the side. Remove 2 screws from the Video processing board, and 5 screws from the power supply. Note: 1 of the 5 screws is longer. Rotate/slide the power PCB away from the cage to clear the speaker and AC plug, Then rotate towards the Video board. Disaconnect 1 plug. The OTHER plug is SOLDERED and must be disconnected from the video processing board.

There you have it. It stumped me for about a half hour. No pry marks. Barely noticed the 2 slits in between the trims. Well, good luck. Happy Soldering.

PS: I opened mine because I assumed it had bad capacitors. It only powers on for a short short period of time.

HP f2105 21" LCD... • Answered on Dec 01, 2014


Go to www.ebay.com Type: make and model of monitor, refine search to power supply.

HP f2105 21" LCD... • Answered on May 16, 2012


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.

HP f2105 21" LCD... • Answered on Apr 08, 2012


If the monitor works fine when tested on another device like if you have a desktop or a friend will let you hook it up to theirs, etc. then I suspect the laptop does not have a compatible driver or just cannot drive the monitor with the onboard video card. That monitor may be too much work for the laptop. Also, have you looked into how much just the lcd would be then maybe see if you can get help installing it yourself?

HP f2105 21" LCD... • Answered on Nov 22, 2011


try press f4 or shift f4 on your keyboard or Alt+cntrlhope it helps

HP f2105 21" LCD... • Answered on Nov 08, 2011


Simply open the set and cut that GRAY WIRE ON THE SET OF WIRES THAT CONNECTS THE POWER SUPPLY TO THE INVERTER CIRCUIT. 100 PERCENT WORKING AND TESTED BY ME. (hardwareman25 @ www.gsmhosting.com or email me @ [email protected] )

HP f2105 21" LCD... • Answered on Sep 24, 2011


Get something pointy and sharp. Gently lift the button up with it.

HP f2105 21" LCD... • Answered on Jul 02, 2011


You need to open it up and check the caps, fuses, and voltages:
http://s807.photobucket.com/albums/yy352/budm/HP/HP%20F2105/

If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on: Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/ Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor and TV troubleshooting guide: http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide http://www.fixya.com/support/r7406380-tv_training_manuals Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you. Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

HP f2105 21" LCD... • Answered on Jun 12, 2011

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