Question about Compaq V700 17" CRT Monitor

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Monitor won't go on when connected also the power supply is different it was supposed to be a 400 volt and the one that is installed is a 450 volt is there any difference of the voltage? and when i hook the monitor to a different computer tower the monitor comes on it blinks on and off but the picture doesn'''t appear. thank you get back to me soon

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Re: Monitor won't go on when connected also the power...

No problem with 450 instead of 400 volts..check Horizontal output transistor and Flyback!

Posted on Mar 09, 2009

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I have ac Acer S202HL LCd monitor. When I booted up one day it didnt come on.

first check with your both power supply out put is coming 19 Volts dc.
if its not coming check with multi meter primary and secondary of your adopter continuity.if no continuity replace with proper working adopter.

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Hi, I recently moved and one of my helpers dumped all of my power supplies in a box. I can't tell which one goes with my monitor, my speakers, or even my external drive dock. Help please!

your power supplies will have a brand name on them, they will also be a certain size and shape at the connecting end, eventually you will 'scooby doo' what goes where

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Power cable description


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:

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1 Answer

It shuts off by itselfs and then comes back on with the volume all the way up after a 2-3 minute span.

* Caution!!! A monitor power supply can still hurt or kill you if you touch it with the power on!! There can be 1000 volts in places for the backlight.

If this is a computer monitor and not a TV monitor, it is likely the power supply in the monitor is failing. (The monitor is resetting) The power supply is not a hard fix, but does require some soldering skills and an oscilloscope to confirm noise on the power supply lines INSIDE the monitor. Change all the ELECTROLYTIC capacitors in the power supply block. (Not the backlight power block - that's different)
Isolation rules apply. Safety first.
This repair is cheap enough to just do it and see the results. Avg parts cost: $10.

Mar 20, 2010 | RCA Computer Monitors

1 Answer

My packard bell lcd monitor shows orange then sometimes green light but has totally black screen. If power supply giving insufficient voltage would this cause above problem?

> insufficient voltage cause ?

Well, anything is possible, but other things are more likely:

1. loose connections of the "data" cable between the monitor and the computer's video-card;

2. an electrical "short" in the data-cable;

3. a "dying" video-card.

So, try the "free" stuff first:

Check the connections.
Try a different cable.
Try connecting the monitor to a different computer (laptop?).
Try connecting a different monitor to your computer's video-card.

Then, consider buying & installing a new video-card.

Nov 18, 2009 | HP Computer Monitors

1 Answer

Monitor light blinks

have you tested the power supply connection feeds? test each connector I think you will find your power supply has failed on either the 5 volt or the 12 volt side more than likely 5 volts are down' the agp adapter needs 5 volts to run. since you have changed out every thing else I would replace that or test your dads power supply in your computer, that should do the trick

Apr 28, 2008 | Samsung Syncmaster 730B 17" Flat Panel LCD...

1 Answer

Aoc 17 inch silver black monitor problem

main regulator capacitor for the hot side of the power supply may need replacement, usually value is 220uf to 400uf 400 volts..

Apr 27, 2008 | AOC CT720G 17" CRT Monitor

4 Answers

Monitor won't turn on, no led.

If the LCD has an internal power supply, then the inverter circuit should be on the board as the power supply. If the power supply is external, then the inverter circuit will have it own board.

What is the output of the Inverter circuit? It should have 12VDC going in, but around 50VAC going to the CCFL bulbs.

The "no led" should be a sign. Your getting voltage, but what about current? It still can be the power supply. All LCD monitors should have a "soft switch", or software driven switch to turn the CCFL lamps on and off.

It is hard to find literature on LCD repair, experience is the best teacher on this subject. This might take several emails or postings to help find the answer.

LCD monitors are a computer. You can break them into several parts, Power, I/O, and processing. Power is the easiest to trouble-shoot and repair. Processing is the hardest.

I fixed one LCD monitor by re-seating the software EEPROM. The process could not do its job if it can not read the software EEPROM.

If one of your IC's is shorted, you can always tell using a can of air. Get one of those cans of air and tip it upside down and spray the entire board until it all turns white. Now apply power to the system. If an IC is shorted, it generates more heat than anything else. It will be the first to loose the white condensation. Don't worry this is safe, done it several times.

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Dell E172FPb 17" LCD Monitor Problem

Your inverter power supply has gone bad. You will need to replace the whole board or replace the the 2sc5707 transistors in the inverter area. Check out this link for installation videos and how to for that model
They also sell the whole board as well as repair kits

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10 Answers

Blank screen

This problem is very often caused by dry electrolytic capacitors on the inverter board. If you have some skill with soldering you could try to change them. When buying new ones ask for LOW-ESR capacitors for switching mode power supplies (SMPS) and 105°C, they are a little bit more expensive than normal electrolytic capacitors, but are designed for this aplications so they lasts more. Normal el. caps will also works fine so when you cannot buy LOW-ESR for SMPS use normal ones.

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