I had a similar problem: the backlight on my Benq T701 only functioned for a couple of seconds every time a turned the monitor on and then the backlight switched off (sometimes in two stages). An electronics guru at work said with those symptoms the transistors rarely were the problem and I just needed to resolder the connections of the high voltage coils onto the PCB. On visual inspection those solder connections seemed ok, but when I tried to reflow the existing solder at one connection I spotted the problem: just a thin surface layer of solder was present and I had to add solder to fix the problem. The 4 coils each have 6 leads on one side and 2 on the other. I only soldered the connections on the side with 2 leads. In just 30 minutes and without buying parts the monitor is now up and running again.
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The green light usually indicates that the monitor is getting a signal. The lack of a picture is an indication that the monitor itself is having a problem. I would test the signal with another monitor if you can get one. I suspect that the monitor backlight has gone bad (if so, you can see the screen very faintly if you shine a light on it). Or, the screen circuitry has gone bad.
My VX924 did the same thing but now displays nothing and power switch light just blinks. According to an answer listed on previous page, it may have bad capacitors. I may have to take a look at them. Viewsonic repair facility examination of this monitor runs $70.
If the monitor remains black when you try to reboot, the CCFL (backlight) in the monitor has probably failed. If your look at the monitor from a sideways angle, you may be able to make out some graphics when the computer is on. If this is the case, you need to replace the CCFL or the whole LCD assembly. If you are uncertain, you should check the ribbon connectors going from the main case to the screen. If you get different results when on AC power, this could be a shorted battery or a bad power supply board. If your laptop has an output for an external monitor, you could use this to determine if the problem is with the monitor only, or with the graphics card and/or motherboard.
I have just had this same problem. The problem mostlikely is a blown fuse on the inverter board. Mine was blown on the board and also a Capacitor (470nF/25V) was bad beside the Fuse.
I replaced both and monitor is working now again. After install the picture was a little grainy with little artifacts. In another post i found that the Power Supply board needs to be cleaned for unwanted residue. After that picture was fine again.
BEWARE that you need a soldering iron and a steady hand to replace these parts. If you are unfamiliar with soldering at all have an expert take a look at this. The Power boards uses 220v so DO NOT connect it to the Power when opened.
The green power light would indicate that it knows it is hooked up to a computer, this is even more true if it turns yellow when you power down your computer. Can you plug this into another computer, or plug another working monitor into your computer? This will eliminate your computer as the problem.
Check you video cable, have you had it off before the monitor quit?
If it is still not working, at best you are looking at a cold solder joint, I have seen many monitors taken out by them and have fixed a few. I would sugest this to you only if you are aware of the high voltages that can be found in crt devices, even when not plugged in.
If you have not worked with highvoltage circuits I would suggest looking for a new or used one. Used CRT's are give them away cheap now. Check your local want ads and craigslist.
We have a dis-assebly and repair guide posted on our web site at: www.ccl-la.com/monitor_repair.htm The problem is usually the driver transistors, our guide shows where they are and what to replace to get your monitor back running again.
check both your power and video connections to the monitor, sounds more like a monitor power issue.
if the connections appear ok, but screen still blank, try connecting a known good working monitor from somewhere else and see if it works with your pc, if it does, your original monitor is faulty, if it doesn't, you have a pc video issue.