Question about Mag Innovision LT765b 17" Flat Panel LCD Monitor

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What is the safest way to seperate the monitor and cover to get to the power board to check for bad capacitors?

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Best way is to use thin flat blade screw driver to crack it open after all screws are removed, starting at the bottom edge and work your way around. Some will have slot to put the screw driver in but most of them do not.

Basic LCD monitor troubleshooting guide:

Failed TV and Monitors:
Capacitors kit: he can make you a set of caps for you.
Please post back what you find.

Posted on Oct 07, 2010


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ACER AL 1717 monitor.The on/off button is flashing green and orange, but the monitor is not turning on. I have checked all the connections.It blinks even if the connection from CPU is not given to it.

It sounds like you have a bad capacitor on your power circuit board located inside the monitor.If you take the cover off the monitor,you will see a circuit board where the power cord plugs in.On the board,look for 1 or 2 capacitors that are swollen or opening at their tops.They will usually be black in color with silver on top and round in shape.If you see any bad ones and have a solder iron and solder removal hardware,you can easily replace the capacitor(s) yourself,which you will find replacements at Radio shack or your nearest electronics repair shop.......good luck :)

Jul 05, 2015 | Acer Computers & Internet

1 Answer

Hp monitor wont turn on.


First, remove the power cord from the wall, insert it into another outlet. Also, change the power cord, in case it is bad. Sometimes a bad power cord may not pass current into the monitor. But if problem persist, then it means the monitor is having a power problem.

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The monitor is receiving current but cannot circulate or transfer the current to other necessary part of the monitor because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your monitor not to power on.

All these can be checked on the power supply board.

But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like ""(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about monitor repairers, take the monitor to the nearest repairman to fix the fault for you. Also, note that monitor stores a lot of current, so wait a while before opening the monitor back cover.

I hope this helps.


Sep 13, 2011 | HP Pavilion F1703 17" LCD Monitor

3 Answers

Monitor will not startup just blinks a few times

Remove the back of the monitor, there will a few screws to undo. Gently prise the back cover away, it is only held by a few plastic clips around the sides, once off look for the power board, if unsure just follow where the power cord plugs into the monitor. On the power board check for any blown capacitors, they are barrel like in shape and have silver tops, check for any dark liquid resadues on the capacitors or on the surrounding board, also check the caps for any domed or slightly pretruding tops, look down the board at an angle to see them, the top of the capacitors should be completly flat, if not they will need to changed. Changing them should fix your problem, if you need any further assistance post back.thanks.

Feb 12, 2010 | Samsung 226BW Monitor

1 Answer

I have a dell e173fp monitor taht is have

Use the dell monitor on another computer, if its having the same issues on another computer then you know the monitor is bad. If its not having the same issues on another computer then you know its a problem with the original computer.

With the monitor turning on and off, if the problem is the monitor for sure then it could either be the lcd screen is starting to go bad or puffy capacitors on either the main board or the power board.

Best way to find out if you can do it. Take the back off of the monitor you will then see a metal shielding cover, take the screws out of that and it will expose the power board which is where you normally would connect the power cord to and the main board that controls the voltages and how info is displayed onto the screen.

A good capacitor has a nice flat silver top on it. A bad capacitor has a silver top that looks puffy or pregnant. It will look like its bulging.

If you find any bad ones, you would need to take a soldering iron and get the bad ones out and make sure you replace them with new ones that have the same UF rating and the same or more in voltage, you can get the numbers off of the capacitor.

The striped side of the capacitor needs to face the marked side on the board.

Again keep in mind if you don't find any bad capacitors on either board then that means the screen is going bad and it would be more cost efficient to replace the monitor then to repair it at that point.

Jan 27, 2010 | Dell Computers & Internet

1 Answer

Hp w2207h screen in blank but flashlight shows icons are

The power supply-inverter board is probably at fault. Remove the back cover and locate the standard ac power cord connector. The board that the power input connector is soldered to is your power supply - inverter board. Check the electrolytic capacitors on the board. They probably went bad. A visual inspection is usually enough to find out which ones are bad. They will be either bulging or cracked at the top and leaking fluid. I usually replace all of the capacitors that have the same rating whether they look bad or not. Will save you another repair later. If the caps don't look bad, you can take the board to your local tv repair shop and have the caps checked with a esr tester. It's more accurate and they can be tested with the caps in place. Hope this helps.

Oct 10, 2009 | HP Computers & Internet

1 Answer

After three seconds power it on the back light goes off. At this point if the display is turned off and on again, the image gets back and gets dark again after three seconds

There seems to be bad solder connections either on the power supply or the inverter Board. You may even have a bad capacitor on the power supply board. When caps go bad sometimes the yswell at the top of them, if you take off the back cover look for swollen capacitors in the power supply. The inverter board has small inverter transformers on it, check for bad connections on it, caution tho this board has high voltage on it. One good way to check the inverter board is while you have the back off. Darken the room as much as possible, even total darkness is good and turn on the monitor while looking at the inverter board for small arching or sparks, if you see any then this is your problem area.

Oct 01, 2009 | NEC AccuSync LCD71VM 17" LCD Monitor

2 Answers

I have an old Princeton monitor. The screen is black and the blue power button keeps blinking. Has anyone had this problem before?

There is a field of capacitors on the power board that usually goes bad. I believe that there is a total of 6. When you look at the power board you should notice them. I have the capacitors if you need them. $2 each. Just check to confirm that they are swollen. and let me know the voltage and uF. good Luck. David

Mar 10, 2009 | Princeton Digital VL1919 19" Monitor

3 Answers

Viewsonic vx800

I have repaired several Viewsonic VX800 monitors. The symptoms include a power light that flickers or flashed on and off or a screen that flashes on briefly or stays off. The problem is bad electrolytic capacitors on the power supply board. These bad capacitors do not look bad and do not swell but they do develop a high ESR (Equivalent Series Resistance). You need a ESR meter to check them. But if you have these problems, you should assume the capacitors are bad and just go ahead and replace them.
First you must open the monitor and gain access to the power supply board.
1. Remove the stand: It is held with 6 screws on the back. Also on the back are 2 black screws that must also be removed.
2. Remove the button bar from the front, bottom: It is pried off. This will expose the 2 screws holding the front plastic bezel.
3. Remove the silver plastic bezel from the front: First remove the 2 screws holding it, then you can pry the rest off. This will expose the 2 screws holding the screen to the plastic back.
4. Remove the screen and electronics from the plastic back: Remove the 2 screws holding it. The 2 speakers are glued to the plastic case. Cut the glue with a knife. The screen and electronics and speakers should lift out of the plastic back.
5. Remove the metal cover to expose the electronics: There are 2 screws holding the VGA connector and 2 screws holding the DMI connector. There are 9 screws holding the cover. These must all be removed. There is a black plastic sheet glued to the lower edge of the cover. It must be lifted. The cover should now come off.
6. Replace the bad capacitors. The power supply and signal processor are on the same board. It is marked VG800-2. The bad capacitors are surfaced mounted 100UF 25V. The bad capacitors are CM16, CM17, CM2 and CM165. The two most critical are CM16 and CM17, but they all read high ESR, so I just replace them all as long as I have them exposed.
Reassemble in reverse order.


Feb 10, 2009 | ViewSonic VG800 18" LCD Monitor

2 Answers

Display goes out

I had a problem with my 1916w monitor where it came on and the monitor began to squeal, the screen went black and the noise stopped. The monitor power indicator whent from green to orange. It turned out to be two bad (domed) CapXon 1000 microfard 25v dc capacitors on the power board. This brand of capacitor has been a known cause of problems in various makers monitors. Replace these two capacitors and any others that have domed tops with a good brand of capacitor of the same rating. Replacing these two capacitors fixed my problem. I have disassembly instuctions for this monitor in answer to another persons problem in FixYa where he inquired how to get the covers off the monitor. Good luck and have a merry Christmas.

Oct 30, 2008 | Computers & Internet

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