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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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  • ndiba07 Jan 28, 2009

    My hyundai monitor was ok untill i disconnected from the power supply now it wont turn on, no green light is showing and i have changed the power cord.

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  • 293 Answers

Hi...there,
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...

Posted on Oct 25, 2008

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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.

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It's probably your dc power supply.

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.


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PROVIEW PL-456S LCD MONITOR TURNING PINK ON ONE SIDE


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.

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Hi, Youo have zeroed in on the problem area. It looks like a power supply problem. More often than not, there is a fuse inside. If you would venture to open the unit up, do a visual check on the fuse. If it is busted: 1. Clean - no burnt/scorching/black marks inside the glass tube, then you can simply replace and hopefully the unit will be operational; 2. Dark smudges - or small burnt metal pellets inside the glass tube, then it is possible that you have other defective components that caused the fuse to blow. Normal components that are known to go bad are the big capacitor and or the power transistor regulator. Most current designs uses a switch mode power supply where your mains AC voltage is converted to DC that powers a circuit that eventually produces a lower DC voltage say 12VDC for use of the monitor. Should you venture a DIY (do-it-yourself), pls remember safety precautions when working with powered electronics. Hope this be of some help/idea. Post back how things are or should you need further information. Good luck and kind regards.

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Hi hoovs, Waves streaming normally comes from the 60 cycles hum of the AC mains. Sometimes this is caused by poor or loose grounding in the video cable or at times a weak or defective capacitor in the power supply of the monitor or at times low voltage supply to the monitor. If after checking your cables (both power and video) are not loose and are snugly fitted to their connection points and you still get the waves, then you are probably better off returning the unit for replacement. Another thing you can check is if the monitor is getting enough power. If the monitor's power supply is rated 100~240 VAC, then it should work out ok. If it's got a 240 rating and you are using it in 110, then the monitor is not getting enough juice which may cause the waves. On rare occasion, waves may be eliminated by simply plugging in the AC plug of your monitor the other way around. Hope this be of some help to you. Pls post again how things turn up. Kind regards.

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