Question about Daewoo L700C 17" Flat Panel LCD Monitor

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It dosen´t turn on

Hi, The problem that I have is that the way to switch is broken, I put a patch betwen the switch and another component but the problem is the same. Coul you want tell me , what components that I have to check please?


Tulia Castillo
The problem is in Daewoo L700C

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Re: It dosen´t turn on

You mention that a switch is broken? I am assuming that you mean the power switch for the monitor? If so, then you can probably get the manufacturer and model, look it up on the web and order a new knob or switch from manufacturer. If this is not an option, then you will probably have to take the monitor apart to see what part of your substitute button is not touching, b/c what a button does it activate a special area on a circuit board that connects or disconnects power to its specificed area (where the button is sitting)

Posted on Nov 25, 2007

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Mine board dosen't work. I redo the solderein of the main ac power and the ones of the 100uF\450V condenser. It work good for 2 hours than it turn off.....and it appaer dead.... what can i do?!?!?!

That caps is for the Main AC side of the switching power supply which supplies about 160vdc (you can measure that voltage on the caps legs) to the MOSFET that drive the step down switching transformer that produces the 5v for logic board and the 12v for the backlights inverter circuits. The power supply is always running even if the power switch (soft switch (momentary)).
So you need to check those two DC voltages without hitting the power on switch, they shoud be present. You can also hook up the lamps to test the power supply function.
Please read my guides to learn more.
Basic troubleshooting guide here:
Failed TV and Monitors pictures:
Learn about bad caps:
Capacitors kit: he can make you a set of caps.
Or just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series

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warc619, Maybe the "button" is only thing broken. Maybe the "switch" is broken. Yoyu will need to see if you can view some video clips of monitor disassembly and repair at YOUTUBE first. Then you will need to "teardown" your unit and determine exactly what component(s) have failed and if you can get new exact same size unit from "Digikey" or "Radio Shack" or "Mouser".... WOW! you may even need to learn how to carefully desolder the bad switch and solder in the new one. Good luck with the repair. You didn't tell us what type of monitor you own!! CRT or CCFL back-lit LCD???? 12fixlouie

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Most likely a power supply component has aged and thus changed value and/or failed. Take it to a reputable repair person.

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Have the same problem and not a single one manage

yamakasi86, This could really be nothing more than ONE POOR quality solder joint on a printed circuit board on the lead of a power transistor in the CCFL inverter circuit. Go to YOUTUBE and learn how other's have learned to deal with poor quality soldering of printed circuit boards. Yes, it sure seems like a "thermally intermittant" solder connection of some component. Have a tech open it if unit is out of warranty, to check visually with microscope for frosty looking solder joints. You KNOW they don't fix them with keystrokes or software patches, don't you know!! 12fixlouie PS could also be bad filter capacitors!

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Check the cabling, to ensure it,s not damaged-broken-kinked et,c. by carefully moving the cable gently side to side and up and down.
If it puts itself right for a second or two. you can assume its a broken internal wire, within the lead.
Or a dry soldered joint-Connection.

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