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No Picture on screen

Found screen off. Powered on and it worked for awhile, then went off again. Now it wont come on at all. I cant see any movement at all on the screen. Is there a schematic for this monitor to help me with trouble shooting, checking for voltages. Do you have any ideas about what might be wrong. I checked AC to the bridge rectifier, and voltage coming out seems OK.


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SOURCE: have a viewsonic va720 screen on and picture on and back off just as quick

thanks Mr. Weather; your instructions made the job easy... got the back off and accessed the inverter...any suggestions as the best place to get a repacement inverter?

Posted on Jan 15, 2008

  • 3 Answers

SOURCE: Dell 1704FPT Display Problem

It is your inverter/power supply board. Costs around $62.00 with shipping. Not a hard replacement if you have electronic maintenance experience.

Posted on Jan 29, 2008

  • 1554 Answers

SOURCE: lcd 17"monitor phillips 170b4bb

that video input board will have to be replaced.
been there , done that.

Posted on Apr 25, 2008

  • 14 Answers

SOURCE: Dell 1800FP Dark, No Power but power supply seems fine. Help!

I just repaired 3 1800FP's - all dead, no lights.
Firstly a dead 2AS01 is 95% of the problem, because some fool designer left out the protective zener diode - cheapness.
Mouser Electronics does not have this part, but lists it at 37 cents in lots of 2500, and gettable at $2.66 somewhere else.
You must also replace the two small value electrolytics near this IC, as some had an ESR of 40 where <0.5 is where it should be.
I suppose as the electro's dry out, the spikes can zap the IC. The quacks on ebay flogging 2sa01's alone, probably hope to sell you another one down the track (at a fat markup).

There are 2 'Sam Young 2200uf' electros that really should be replaced, with ESR or 2-30 ! Ideally replace ALL electros, as the others will be off - but those 4 as a minimum and using a jewelers loupe, resolder other joints on the transformer and anything that looks more dull silverish, than the rest. A 1 inch used and worn paint scraper will get the case open easy.

DANGER, CAUTION : Finally when refitting the inverter board, ensure the steel tab is over the TOP middle of the board facing away from the power socket (SO YOU CAN SEE IT) . The board sides in flat. It is possible to scew the board down with a slight bend, with the tab pressing over the pcb tracks - very , very bad!

Now all I need is for some kind soul to improve the fix by stating what the value of the missing zener should be.

PS. Just because the caps are not bulging does not mean they should be OK. Most wrecked 10 year old power supplies have better ESR's, so the electronics must be hot under the cover.
I have seen bulging caps with a GOOD ESR, and non bulging ones with an ESR of 47.


Posted on Aug 28, 2008

  • 286 Answers

SOURCE: viewsonic ve150m problem white screen

Are you still using the same computer that was set to 200Hz? If so, start Windoze in safe mode and reset the display properties to 1024 x 768 60Hz. Reboot the computer and everything should be OK.

Does this model use an external ac adapter or an internal power supply? Twice I have seen a white screen caused by bad capacitors in the power supply. They may look good, but you should replace them anyway. Look in the 2ndary circuit of the power supply, you should see some capacitors that are (for example) 220uF 16 to 25V, 470uF 16 to 25V, 1000 uF 16 to 25V (all those capacitors could be 16V or 25V). Replace them and try the monitor again.
If it uses an ac adapter, try a different 12V adapter. Make sure it has the same or higher amperage rating. If you can't find one, you will have to measure the power going onto the board inside the unit while the adapter is plugged in and the monitor turned on. If it is less than 12V you need a new adapter.
If none of this helps, the panel or main board may be damaged. In most cases these two parts cannot be repaired.

Posted on Jan 22, 2009

  • 47 Answers

SOURCE: blue power button flashing with blank screen

This is most likely the power inverter board in the monitor - this is common in many monitors. If it started taking longer and longer to display an image, and the power light is blinking on-and-off, that's the problem. You can confirm that it's the monitor and not your computer or the cable by plugging in another monitor if you have one to try.

If it's under warranty, send it back, if not, there are inverter boards for many common models of LCD monitors that are replaceable. The board can run anywhere from $50 on up. Depending on how old it is, you may find it better to just replace it with a gently used one from ebay.

Posted on Jun 06, 2009

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I had this similar problem. I found out that there was a bad 1000uf, 16V cap on the power supply board. The cap is too close to a heat sink and over heated. I bought the cap at radio shack for $2, installed it so that it is far away from the heat sink. Monitor now stays on when powered up.

These monitors are difficult to open.

After removing the stand, you need to insert a flat screw driver at the bottom of the screen where two slots are located. Then work the screw driver around until the two plastic pieces are separated. Remove the cover plate and unscrew the push buttons. Unplug the monitor cords from the driver board. Unscrew the mounting screws from the power supply board and remove. You will need to pinch the plastic support in the middle of the board to remove. Unsolder the cap. It is located near a copper heat sink and the value will be on the cap. It will be buldged up on the top. You will see burn marks on the board surrounding the cap. Install the new cap and solder. Be careful not to solder across joints.

Reassemble and turn on. Should solve the problem

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Zenith 13in flat screen tv has no picture...

Welcome to FIXya

did you try to unplug it and plug it back in
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Power but no picture

Try to re-solder the inverter part of the board. You may recognize that part where the 4 connectors from the backlight tubes can be found.... usually the small transformators (sorry, my technical English is not good) have bad soldering eyes after longer use. This may work if backlight turns on for a few seconds, then the power led is still alight but screen goes dark.... the inverter then "thinks" one of the tubes might be defective and turns power off. Hope this helps a little...

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Hi you can inspect that what's wrong with your monitors. After you turned it on and the screen went black, you have to check that if you can see the image on the screen or not by shining a flashlight into the screen, not directly but find the best angle to the screen and take a look very closely. If you can see the icons or any image, there will be a minor problem. This is because of the lamps inside screen. Some of them were broken and it is very easy to replace. If you cannot see anything on the screen, there'll be some problems with inverter board. If you have soldering tool and want to fix it by yourself, check the caps first. It may cause this problem. Some caps might show leaking or burn spot on the board because of too high temp. If you don't have soldering tool, you better go get a technician to do so. Hope this help!! If anything I can help you with, feel free to let me know.
Thank you,

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