20 Most Recent HP Compaq 1720 (Carbon, Silver) 17" LCD Monitor Questions & Answers

Try set down the vertical frequency to 50 or 60

HP Compaq 1720... | Answered on Sep 08, 2014


The power supply is 12v. There are two different versions of that model monitor and the plug connector for the power is different. One version has 4 pins on the power connector on the other has just a center pin and barrel. You need to check the connection on the back of your monitor before you order that adapter to be sure and get the correct one that you need. You can get both type here:

HP Compaq 1720... | Answered on Mar 13, 2013

make sure you have a wall-mounted rack which suits your monitor. Contact your PC dealer for details ..

HP Compaq 1720... | Answered on Oct 29, 2011

Failing Power capacitors. The capacitors hold the charge necessary to build up the voltage that lights the screen. When they leak or fail to hold the charge, the screen will cut out. It could also be a fault in the switch circuitry. Really needs looking at by a qualified technician.

HP Compaq 1720... | Answered on Jul 21, 2011

There are two pairs on the connector: one pair for 12vd, one pair for Ground return.
I did not work on one of this model for a couple of years, but I use Ohm meter to find out by check for 0 Ohm between the Monitor metal chassis which is ground, tow of the four pins should read 0 Ohm, that will be the Negative, the other 2 will be +12vdc (it should read 0 Ohm between these two 12vdc pins).

Please post back what you find.
Please leave rating if it helps.

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors: 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 Compaq 1720... | Answered on Jan 28, 2011


In regards to your issue with your monitor if you have changed out the VGA cord and tried the monitor on another computer but still have the problem this is a sign of a short in the monitor its self.

Note with modern electronics they have contact switches. What this means is means is you close the same circuit to turn a item on or off. The problem with these switches is that if there is a short that is not properly going to ground this can cause a charge to build up on the mainboard to a point where is starts turn on or off things on its own. If not fix this can damage the device more.

So you can try to take the monitor to a electronic repair shop but in most cases if maybe cheaper to replace the monitor. Another thing you can try is making sure that monitor is plugged in to a properly grounded plug. Less than 50% of house that were built over 10 years ago have properly grounded plugs. If you are not sure you can get a tester at your local hardware store. It looks like a 3 pronge plug with lights and it will let you know if the plug is grounded. Once you get the monitor plugged into a ground plug this may fix the problem for the time being.

Let me know if you have any more problems or questions


HP Compaq 1720... | Answered on Jan 08, 2011

Looks like a component failure in the monitor, the backlight or inverter box has problems.

Its a common fault.

HP Compaq 1720... | Answered on Nov 13, 2010

Not very likely to be the switch itself, the switch is a tactile momentary switch, more likely to have failed power supply due to bad caps just like the rest of failed monitors here, check to see if your adapter is putting out 12vdc, then we need to find out if it is getting 12vdc all the way to the main board and the inverter board:
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Please post back what you find.

HP Compaq 1720... | Answered on Sep 03, 2010

You need to find out if the power supply is still putting out 12vdc, you may have to test it with a load (use 12v car bulb such as the brake lamp). It is getting hot can be due to bad power supply or too much load because of short circuits in the monitor. Please post back what you find about the power supply first.

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

HP Compaq 1720... | Answered on Sep 03, 2010

hi im josh in cebu phils. Maureen may i help you? If it happened yesterday that the contrast box keep on coming. there's a problem in your monitor.so try to check the buttons if covered with dust cleaning may solved the problem.Maureen if you have the manual use it in adjusting the resolution and if you dont have try to press the button mark + or increase just press both of the to the brightnest as posible so that you may be able to proceed another action. thats all for now.hope i helped you.good luck.

HP Compaq 1720... | Answered on Feb 26, 2009

Maximum resolution for this monitor is 1280 x 1024 .

Rate this solution as fixya if the above answers your question !



HP Compaq 1720... | Answered on Feb 22, 2009

researched online for cord.

HP Compaq 1720... | Answered on Dec 06, 2008

I checked your monitor and judging by the picture, it requires an specific ac adapter. see photo below to see if this is what you see:

2edb0f8.jpg I show the spare part for this ac adapter is 308573-001. it runs approx $45 on google. Hope this helps.

HP Compaq 1720... | Answered on Jun 08, 2008

You may need an adapter plug. They come with new monitors so ask around to see if anyone has one you can borrow.

HP Compaq 1720... | Answered on May 11, 2008

You can get replacement buying at any computer stall.

HP Compaq 1720... | Answered on Apr 21, 2008

Your actually thinking about it the wrong way.
Replacing the screen in LCD's is more expensive then replacing the monitor. Stupid I know, but that is how they ensure you have to keep upgrading. Same thing applies to a laptop motherboard for the same reason.

You do still have one small light at the end of the tunnel though.
Check around on eBay or similar and you maybe able to find a complete monitor with a dead power board that you can salvage the screen from. Do a search for words like Faulty, broiken, not working in the computer section.

Hope that helps. =)

HP Compaq 1720... | Answered on Apr 11, 2008

Ok yet one more bad monitor post, ever search here, or at HP real>
teal as in the DUCK?
why not just plug this old monitor in to know good PC
and end all the drama? guessing HW/ then Software?
NO OS stated
NO PC stated.
all we know is TEal /pink boxes. as clue to any of this.
no photo post of the bad screens.
it just shuts off?(if that means the monitor turns off)
then it is bad monitor. if does it on 2 PC.
for sure, monitors can go to sleep. sure. amber power LED.

if the PC signals go dead it tells you, lost sig /lost signal , going to sleep or out of range errors on the monitor (the monitor has its own brain inside that does that, the PC could blow to bits and do that)

but the power lamp does not go dead, it changes led color
as your manual states. (lost it, its free, and easy to find)
sure it ran before all did before, but not now. all things fail.
nothing is immune to failure for sure Entropy and more.
this monitor is 10 to 12 years old today(carbon dated by me)

here is the free manual

what will be , will be, can't change fate after the fact.
not me, only GAWD.(your deity)
All i can do is tests, find the truth and state it.

so does the power lamp self turn off?
and in the OSD manuals all power savers and timers set to off
when monitor goes dead (inside)
turn it and fast and hit the MENU botton and get the OSD screen.?
if not the MONITOR IS Bad.
if yes, but the OSD is pink the Monitor is bad.
OSD + is the monitor brain menu's , on screen display.

this monitor is oldest is NOT LED monitor
and has those nasty , CCFL lamps inside that fail
they turn yellow or pink.
the go dim
they go dead.
they go intermittent (per above ways)

I think you tried, HTML on TV.??? and that failed.?
then the monitor is bad.
the as-is value is $9 on the street.

find LED monitor, and it will last long.
so vga cable fails and HDMI fails so its not cable issues,
and is not PC issues if the power dies, and is not amber or green led. or aqua-white color,
black LED for power ,is power supplies inside bad or shorts inside.

that is it., If you test it on 2nd PC and fails, it is bad the old monitor.
btw most are this old. due to the CCFL never ever lasts.

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