With out any previous problems, my AL712 will no longer power up. I've checked all the usual with changing cables for ones that are definitely OK and I've taken it apart and checked the power supply fuse. With the case off, toggling the mains on off rocker switch does give a small result. There is the small click on the in built speakers as they receive power and a little bit of gass/static type noise from the monitor. And if plugged in as a second monitor on a laptop it is still seen. Any suggestions?
Hi tafkab, Sounds like it's probably the backlight inverter board. Try the test I have at the bottom to see. It's a very common problem. LCD's use four small Cold Compact Fluorescent bulbs to back light the display. (thats what gives the LCD it's brightness allowing you to see it) The inverter board runs these lights and when they go bad they will typically show symptoms like you have or the monitor power light comes on and you have either no display or a very dim display. If you ever have one that has no display but the power light is on you can check by shining a flashlight directly into the LCD from the front (right into the screen) if you can see an image then it's either the inverter board (most likely) or the CCFL bulbs have gone bad. The inverter board and CCFL's are replaceable. Good Luck, Dude
Posted on Nov 26, 2006
1. Check to make sure your monitor is on! Some monitors have more than one power button or switch - check to make sure they're all switched on.Check for disconnected monitor power cable connections. Your monitor might be working fine and your only problem may be a loose or unplugged monitor power cable.Note: A disconnected monitor power cable could be the cause of your problem if your monitor's power light is completely off.Check for disconnected monitor data cable connections. Again, your monitor might be turning on without a problem but no information can get to it because the cable that connects your monitor to your computer is disconnected or loose.Note: A disconnected monitor data cable could be the cause of your problem if your monitor's power light is on but is amber or yellow instead of green.Turn the monitor's brightness and contrast settings completely up. Your monitor might be showing information but you just can't see it because these display settings are too dark.Note: Most monitors today have a single onscreen interface for all settings, including brightness and contrast. If it turns out that your monitor isn't working at all then you'll likely not have access to this interface. An older monitor might have manual knobs for adjusting these settings.Test that your computer is working correctly by connecting a different monitor that you are certain is working properly to your PC. Your monitor may be working fine but your computer might not be sending information to it.If the new monitor you connected does not show anything either, proceed to Step 6.If the new monitor you connected does show information from your computer, proceed to Step 7.Important: When testing with the new monitor, make sure you use the data cable that came with it and not the one from your original monitor.Determine why your computer isn't sending information to your monitor. Since neither monitor works, you now know that the computer is not sending information to the monitor. In other words, you've proven that your computer is the reason that nothing shows up on your monitor.Chances are your original monitor is working fine.Test your original monitor with a monitor data cable that you know is working. It's possible that the monitor itself is working properly but it can't receive information from the computer because the cable that connects the monitor to the PC is no longer working.Note: If possible, test using the data cable from the monitor that you successfully tested with in Step 5. If not, purchase a replacement monitor data cable to test with.Note: The data cable on some older monitors are permanently connected to the monitor and are not replaceable. In these cases, you'll have to skip this step and proceed to Step 8 Replace the monitor.
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I had the same problems with a PE171 monitor. The circuit board is pwb276. Is anyone familiar with what U920 and U960 are? I can't find their brand on the web. They are marked L26CA and L31CA. The problem was U920 had a hole blown in the top of the plastic and U960 overheated and discolored the ciruit board, evaporated solder. I'm not sure if this was the cause of the original problem. Since turning the monitor off meant cycling the power until it remained on, my son left the monitor on 24/7. At night he put a jacket over it and that may have overheated the board and caused the problems with U920 and U960. Anyway if I can find u920/u960 then I'll replace them and go from there. Or where can these boards be bought?
I have the same problem... I cannot fix it, and it is the inverter board... Anyone know which chips commonly die on these?? The power goes on, BL is on for a second then goes out... HELP!
The board is also labelled pk10v000710 jm777y
thanks
In the power supply part, U801 and 4 SMD resistors(R819,R819A, R820, R820A) were blown out in my AL712 LCD Monitor. Can anyone tell me the numbers/letters on U801 and the SMD resistors?
In the power supply part, U801 and 4 SMD resistors(R819,R819A, R820, R820A) were blown out in my AL712 LCD Monitor. Can anyone tell me the numbers/letters on U801 and the SMD resistors?
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