20 Most Recent AOC LM729 17" LCD Monitor Questions & Answers

1280 x 1024 @75Hz made 2003 a real relic, gee it ran for 14 long hard years. amazing. the CCFL tubes are dead , or dim, all CCFL this old are dead. or weak or intermittent and all are bad. the background lamps died in a dim room point flashlight to lcd see, data, bingo for dead CCFL. the MON will fail on all PC connected to. for sure. best reso and max is 1280 X 1024 @ 60Hz it does not do all resolutions below that, see the manual for the few it does, AOC LM729 https://www.manualslib.com/manual/689817/Aoc-Lm-729.html?page=7&term=ccfl&selected=3#manual CCFL bad 99% or 1% bad inverter 600v

Connect rf modulator to aoc monitor? This trouble maybe power supply or inverter boards is defective. first you can test the voltage of the multr,and then check which part is defective.From Wisiny.com can find those parts if you have any question,please let us know email:[email protected],we sincerely hope we can help you! you can also check this boards whether suit you: 715L1103 AOC IDPC7425A3 Power Supply for TFT1780PSA LM729

check RAM or replace it

Hai Ejor,

You need to replace the front panel menu buttons,

Regards
Aby

This is an old post but maybe this will help someone else......

I have sold a lot of these LM729's a few years back and now, out of warranty, they are starting to show these same symptoms. I was stumped at first but finally did some real testing on them and found that in every case it it the 1000uF capacitors that are faulty. Look at the board and you will see 2 capicitors, the barrel shaped components, that have 1000uF printed down the sides of them. Both of these should be replaced even if only one is bad because chances are the other will go soon as well. You can usually pick these up for under 2 bucks each at your local Radio Shack. Get ones rated for 35 volts (35V), the ones on the board are 16vols but I usually try to go a bit more robust when I replace capacitors. The rating is just how high the voltage can go so it's okay. They are usually more durable since they are to handle higher voltages. Just take the LM729 apart, remove the power board, desolder the capacitors, clean up the holes, (Be gentle in desoldering them, you don''t want to pull the things, you will pull off and possibly tear the copper foil pad that you need to solder the new cap to) Install the new capicitors minding the polarity, as in there is a MINUS sign on the capicitor and this must go in the hold with the matching MINUS sign. Solder the leads, clip the excess off. Reassemble and you'll probably find that LM729 working just fine! These are very good monitors and very rugged. AOC isn;t at fault for this failure. The Chinese have been making scads of bad capicitors for a few years now. Anymore, if there is an electronic failure it can be traced back to bad capicitors.

ang problema jan ay power supply mo bka mababa masyado ang kuryente marunong ka na bang mag set up ng PC
sana natulungan kita

If some of the pins inside the monitor cable are bent or broken you can losr primary colors and cause this. Check them. If they seem OK try reseating both ends of the cable. If no go, then try the monitor of a differnt computer to see wether its the videocard or the monitor thats defective.

the inverter needs to be replaced
not real hard, but must have some knowledge of the process

repalce data cable

You just lost a pixel..

Your resolution is too high or too low try changing it.

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

Hi...there,
It's seems your backlight inverter are busted...Need to replaced a new one or repaired it.

Here is the service manual: http://elektrotanya.com/?q=showresult&megnev=AOC%20&megnev2=LM729%20&kategoria=&kat2=all

You will need test lamp to verify if it is the inverter or the lamp assemblies.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

my 3 aoc tft1560ps 15inch back light is off plsss help me capacitor replace already

You can get the drivers from www.driversguide.com

Hi,

To my understanding, an AOC LM729 is capable of 1280 x 1024 and therefore should be able to display your preferred 1024x768 .

Perhaps you need to set the PC's Display Screen Refresh Rate to 75 Hz or lower (DisplayProperties/Settings/Advanced/Monitor).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

I've had a very similar issue on many Dell Monitors. Mine have been under warranty and they usually send me a new monitor, but I believe the issue lies with the power supply within the monitor.

just change the 4 bloated caps on the board (2)100mfd 16v and (2) 470mfd 16v

ur video cable should be replace
if helpful then rate me