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Power supply problems


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My viewsonic lcd has no power. What seems to be the problem? thanks in advance.

Look for bad caps first and main AC fuse, yours is very similar to VA702.
If you are going to DIY 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 VIEWSONIC monitors to get some ideas what to look for:
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Capacitors kit: he can make you a set of caps for you.

Sep 16, 2010 | ViewSonic VA703B LCD Monitor

2 Answers

LED blinks in milli seconds and the images appear too late.

If your lcd comes with ac adapter open this and check for blown or bulge capacitors, replace this with same value.

If your monitor comes with plug cable, open your monitor (too risky to do it by yourself) check the power supply section, check and replace blown and bulge caps.

Jul 09, 2010 | Samsung SyncMaster 740N 17" LCD Monitor

1 Answer

Monitor light blinks no picture

(Please be advise that if you don't have the knowledge, the proper skills and the right tools to open the back cover of your monitor and replace its part...don't risk it...
Otherwise, bring your unit to a credible technician and avail of warranty if there is any.....) If you have guts.. then do the following steps..

You said your monitor will blink but no picture display... well, there are possible reasons why this problem occur..

1. Open the back cover of your monitor..Check the power supply section for possible loose connections and blown capacitors.. Resolder any loose terminal connection on the pcb. Check for any blown capacitor, replace the capacitor with exact value, and also replace any bulging capacitor..If you have successfully replace the parts you can try to turn it on and connect the vga cable in it to the video card of your computer. Turn on also the cpu, if the monitor led turn green and the display came out..that fixed it.

2. In case you have successfully repaired the power supply section and the led of the monitor stays green.. then the problem will be in the inverter board section....Turn off your monitor... open the back cover...on the inverter board section.. check and replaced burnt or overheating high voltage transformer..if one or more of this overheats, it is enough to affect the supply current from the power supply section and that may cause to blow your capacitor...If the ballast transformer is working fine the last thing to check is the backlight inverter (the light that illuminate causing display in your monitor) Replace any busted lamp.. that should fix the black screen on your monitor. ..

If you find this information very useful..please be kind to rate this solution and vote for this on the help below...thanks..

Much appreciated if you rate this help...thanks...

Jun 02, 2010 | Dell UltraSharp 1800FP 18.1" LCD Flat...

1 Answer

Monitor on/off button flickers

The reason why the button of your monitor flickers is because the 12 volts output supply for your inverter board is not stable..
If you have the skills and the right tools for this, Here's what you need to do
1. If your monitor comes with a power supply adapter, open it..check and replace blown capacitor with same value..
2. If your monitor is using a cable power the back cover of your lcd..on the power supply section.. check and replace blown capacitor.
3. Check and resolder the terminals for fixing possible loose connections.
4. On the inverter board section...check and resolder the terminals for fixing possible loose connections, the high voltage inverter usually loose connections when overheat.
5. Other things to check if step 1 to 4 did not resolve your problem. Check and replace burnt high voltage transformer.. Check and replace busted backlight inverter..

Hope this fix your problems..

thanks.. much appreciated if you rate this help.

May 29, 2010 | Samsung SyncMaster 204B 20.1" LCD Monitor

1 Answer

Startup trouble

this is cause by deffective power supply.

Jun 26, 2008 | Samsung SyncMaster 540N 15" LCD Monitor

2 Answers

Monitor wont power-up

It is usually the Large Value Caps around any heatsinks etc. in the Power Supply.. I usually simply replace ALL Large Value Electrolytic Capacitors, with same or better temperature ratings. This often fixes any problems.

Jul 01, 2007 | CTX F973 19 in. Flat Panel LCD Monitor

1 Answer

Monitor problem- colour changes to white appearance to yellow appearance


Mar 18, 2007 | SAMTRON 55V 15" CRT Monitor

1 Answer

Monitor switching to standby - CV735 monitor with Presario 5000 series desktop

my compaq crt monitor not showing color. its shows only blue, green colors . u please tell me. what is the problem to solve it.
is the monitor fault or any other.

Oct 30, 2006 | Compaq CV735 17" CRT Monitor

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