Monitor turns on then shuts off

dd
yh

I agree with Tumlegutt. There can also be an issue with blown capacitors. I had the same VX715 monitor I bought with the same issues from a seller for $30. The display would shut down after 3 seconds and the screen was black. I used a flashlight on the screen and could still see the image. Right away I knew that the power supply wasnt the problem because if it was I wouldnt have an image on the screen. I also knew it couldnt be the backlights because it is highly unlikely that both backlights would be out at the same time. I narrowed it down to the inverter transformers. I opened the monitor and scanned them with my eyes. I also checked the backside of the board for dry joints. The soldering looked fine. I was still convinced that the issue existed in and around the inverter. I then scanned the board with my eyes and noticed 2 1000uf 16V bulged caps near the inverter side of the board. Lucky for me I had 2 esr capacitors of the same value made by Sanyo. I went ahead and removed the blown caps and soldered the new ones onto the board. I proceeded to reinstall the metal cover at the back and then I closed up the monitor.

I then hooked it up to my PC and powered it on. The monitor turned on and guess what...the screen stayed on! I tested this for 5 days and there were no issues. I already had a 19" Dell monitor so I re-sold the Viewsonic monitor 7 days later for $120. Not bad huh? I just saved a good monitor from going to the landfill.

Now back to topic, I suggest scanning the board with your eyes first. If you need to solder and you arent comfortable or dont know how to do it, I suggest sending your monitor to a professional or an electronic repair shop. Good luck.

One thing you could try, does not cost anything.... Be aware that voltages might be present inside monitor also after turning off!!! Open monitor back side plastic cover, open metallic shield. Locate power supply / inverter board, take the board out so yo can inspect it (have to take off three cables and some screws). Locate the inductors on the inverter side of the board(they are round and you can see copper coloured wire). Check soldering on the backside of the board.

Have seen many vx715 monitors this with this fault. The soldering is bad, making symptoms as you describe.

Electr. Engineer SF

Find and replace the ccfl inverter board. Usually internal on the rear of the lcd panel under an aluminum shield.


srich