Question about AOC LM729 17" LCD Monitor

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AOC LM725 Color Cycle

Im a novice in electronic repair. just researching here n there about what i need to fix. My AOC got power on/off cycle. Learning from few articles, and a book, I found s push/pull transistor (C5705) shorted and replaced it. I also replaced C945 and A733 transistors and /A431 IC. Now it did power up but only display Red Green Blue, White and Black color cycle continuously. Im suspecting an IC labeled SC68410Z KA23500506C, or something like that but can't find it from the shop I frequent. Any help out there?


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  • filmdock Jul 05, 2009

    Because the AOC LM725 I was trying to fix belongs to the studio I work for, I didn't bother to bring the video cable along because the original problem was power cycle. Now when I changed the push pull transistor (C5705) which I tested and found shorted and the precision shunt regulator IC (A431) the power came back but it just kept cycling through full-screen RGB, Black, White color display. I thought that maybe if I'll try connecting it to the cpu with the right video cable it might behave differently, so I did, and walla--it's working! I just have this OSD lock display whenever I press the menu but I've read from some articles that it could be disabled by turning off the LCD and pressing the Menu button while turning it back on again.

    I hope this helps someone else out there.



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AOC brand are disposable, now if your going repair its chips, its definitely work or not... i tell you this monitor is very deliquate to work normally.... buy a new one...

Posted on Jun 16, 2009


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No, all you need to do is reset the monitor to factory settings. I fixed mine that way.
If your monitor goes off every 3 seconds (like mine did) you have to be fast or siwtch it on/off few times between the steps to get it fixed.

- 1st. unlock the OSD if when you press 'menu' you get the message 'OSD Locked'. To do this switch off the monitor, and press 'menu' while you switch it on again.

- 2nd. Switch it on, press 'menu' and quickly 'press '<' (left) twice and 'menu' twice to get it reset.

- 3rd switch it off and on again and if still goes off after 3/4 secs, try to reset it again.

I reset mine and it is working find. Before it went blank after 3 secs.

I just tried this because I did not understand why if it was a hardware problem I could see the screen for 2/3 seconds and if pressed on/off it came back, it made no sense as a hardware problem.

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Maybe one of the volume buttons on the front panel control is randomly shorting. Check it out...

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Change the monitor and check if the PC works. If it works then the problem is with the monitor, you will have to send it to repair. If not then, the problem should be with the power supply, check whether all the cables is kept intact.

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AOC LM725 LCD Monitor

try looking for bloated caps, check all diodes... see if its not shorted/leaking and finally check the power regulator ic if its not shorted! note: some capacitors and diodes are very tiny, you should use a lens with good amount of light...

if it does not help..... well, what the hell? try pouring some gas, then light it up! that should solve the problem, at least it turned on right? hehehehe!

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Aoc lm725 display off after few seconds

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Solution #1 above fixed my problem. Turn the monitor off, then hold the left button down while turning it on again. Works like a charm!

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