Question about LG Studioworks 700S 17" CRT Monitor

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Blinking of moniter 700e lg

I have a LG 700E (Ic - LGM148-03C-007) and after switching on
LG 700E monitor's power LED blinking continueously and there is no display and no relay sound at startup, but inplace another monitor working properly. Sometime it automatically wakeup, but take 20 to 30 minute, sometime more. Please tell me how can i resolve this problem and how can i get service manual for this monitor.

Posted by sanjugalande on

  • Todd Soden May 11, 2010

    what could be the issue, is if for some reason the monitor was connected to a computer with a resolution set higher than the monitor supports. Does this monitor have the same issues when used on a different computer?

  •  binay biswas
    binay biswas Feb 08, 2012

    brother......... change capacitor ..main filter 220mfd/450v....1000mfd/10v (5v line capacitor)......1000mfd/10v (6.3v line capacitor).problem so cont- [email protected]



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I think that two capacitors in the powers supply circuitry(incise the monitor) has gone bad. Just open and you'll see them.
This should solve your problem.Best of Luck.Please rank me appropriately. If you want any clarification, Please get back to me

Posted on Jul 27, 2009


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SOURCE: LG 700E monitor's power LED blinking continueously, no display

I had a similar post about an LG 505G. Just bought a new LCD monitor and decided to open the monitor before putting it on permanent storage. I noticed a bloated capacitor in the control board just adjacent to the low voltage power supply. It was a 1,000 mFd 10V cap. So what the heck I desoldered it and replaced it with a spare 50V capacitor of the same rating I had lying around. I assembled the unit plugged it in and VOILA!!! the monitor was working again. Hope this helps.

Posted on May 09, 2009


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LG 700E monitor's power LED blinking continueously, no display

The monitor is probably on protection.

To start unplug monitor from power and from computer and test computer with different monitor to find out if it is monitor or computer fault.

If it is computer fault and no video signal , then test:

  • Video cable.
  • Video adapter on PC (sometimes integrated on motherboard)
  • Motherboard.

If it is monitor fault , then the monitor is on protection.

When on protection you keep having a flashing led on front of the monitor , and monitor turning off by itself after a while, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or a broken contact, identified an internal fault and kicked in , starting the flashing light.

If you are in situation one, then the monitor will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occurr are a blown capacitor on power board, faulty inverter board, faulty input board, or a fault on LCD Digital Controller board.

Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.

Try moving the video cable, and if the cable is not built in, then also try a replacement cable.

If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

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