Monitor not turn on when hooked up to power supply only
Hi hope u can help, im new to all this, just bought this s/hand, asured it was working, using sky tronic switching power adaptor with a 12v insert, but when i press power button on monitor nothing happens, power supply shows constant red light have already hooked up to pc but no joy would appreciate any help or have i bought pig in a poke
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Re: monitor not turn on when hooked up to power supply...
The AC Adapter supposed to lite GREEN not red... Try a different AC Adapter if you got one..
If it still the same problem after changed another AC Adapter... Then it's your backlight inverter are busted. Need to replaced a new one or returned...
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Check that you hooked up all the power supply connections. Try a new motherboard battery as the old one may be dead and the bios is not working. You are evidently not getting a post beep signaling that the cpu, ram, video are good.
You just bought a new power supply for the monitor? Did you set the B+ voltage to the correct settings. Rebuilt power supplies for CRT monitors are not set correctly at the factory. Use your schematic to determine the proper B+ and then set this under load.
hi im josh in cebu phils.may i help you. Friend your 478 mainboard doesnt work.? All you have to do is to check the hardware attached on it like hard drive video card memory and most of all the power supply cable.be sure you seated it very well to avoid loose connection. this can cause no display or not working. try to check alson if your pwer supply has enough current to support the mainboard and alson the processor compatiblity with the mainboard. good luck hope i helped you.
your monitor does not support the screen resolution that your windows install is set to. hook your pc back up to your computer guys monitor, and reduce the screen resolution, then hook it back up to your monitor.
Mine would blank just 2-3 seconds after power-on.
I pulled this monitor out of the garbage - someone threw it away. I found any old 12vdc power supply I had laying around (1 from an hp scaner 1250mA, another rated at 600mA) neither could supply the current (amps) required to run the backlights, therefore backlights shutdown, monitor goes blank--monitor stilled powered on, but black.
I tried all of the disassembly, re-solder various solder joints on the LCD Inverter board and removing the heat/magnetic shield from inside the back cover of the monitor. Nothing worked.
I bought a Segate 80gb external hard disk drive that came with a 12vdc power supply, looks like a typical laptop power supply, rated at 3A (3000mA). Plugged it to the monitor, it powered up, and it works flawlessly.
Chances are that you are not hurting anything with the lower power supply. What is probably happening is most likely two fold.
1. The light bulbs in the backlight circuit may just be wearing out and need replacement, and
2. the lower current power supply may not be capable of producing al the current that the monitor needs at certain times during operation.
I would suggest getting hold of the correct power supply module and see where that gets you. If you still have the red outs,replace the light bulbs in the monitor. The only other fault than that would have to be in the video controller.
Hope this helps.
I had this exact problem with a newly bought motherboard and it turned on but the screen was black, also I noticed once it turned on it wouldn't turn off, (Am wondering if this is happening to you) the motherboard was fine as it is in the other room now working away, so dont get rid of it just yet.
Most new motherboards require additional power to the processor from the power supply, through a four pin power cable, which should be availble with the newer power supply units having (number of pins for you motherbpard power supply) + 4 (which is the 4 pin J-connector) printed on the packaging. If this is connected and you are still having problems which for me was the case, then you will have to try a different approach.
Cutting the chase, the problem I had that produced similar effects of screen being black when the motherboard was powered on, was to do with my case. It was one of those flimsy aluminium foil types. I came to this conclusion by taking my motherboard out of the case and hooking it up to the cases power supply on an insulated surface such as a cork mat. It then worked fine again. So I bought a good qulaity case with a new power supply just to be sure, hooked everything up and hey presto it was fixed. It turned out that enough power couldn't get to the board as the case was shorting its supply. Hope this helps.