AOC 2219VG 22” LCD Monitor with No Display Repaired
I obtain this AOC 2219VG 22” LCD monitor from my friend during a university friends reunion held few months ago. The monitor does not power up and he intended to discard it into the trash bin. Since he is discarding it, I stopped him from throwing it and I took this monitor home hoping to revive it.
I went back home and power the monitor from my pc. The power light is in standby mode (orange) but upon pressing power button the light turns yellow and nothing shown on the screen.
When shine torchlight directly to the screen, at certain angle, I was able to see a glimpse of AOC logo but very dim. The below is the illustration I did similar to my observation as it is too dim to snap through camera.
Initially I suspected the backlight inverter must be faulty as the AOC logo was very dim but I need to look into it to see what went wrong. In order to reach the pcb boards, the whole monitor bezel are required to be removed. The plastic bezel is pretty tricky to remove. You may refer to this link on how to remove the bezel, similar model from AOC.
https://www.youtube.com/watch?v=FfbmQRuqDD0
I’m using flat metal pry bar to open the bezel up. It is a vital to have a pry bar as nowadays more and more appliances are assembled using plastic bezel which may be fragile and easily damaged when using traditional flat tip screwdriver.
Once the bezel is removed, the whole unit is shielded with aluminium casing.
On the left, there are 4 wires needs to be disconnected before removing the aluminium casing. These are the CFC backlight power wires.
Upon lifting up the aluminium casing, further remove the flex cable & button control board. From there, look like there are two boards only. Further unscrew the two boards from the casing.
On the power board, two bulge capacitors was spotted, 1000uF 16v rating.
Both capacitors removed and measure are indeed bad value capacitors. Way out the values, no wonder it does not power up properly.
I replaced both faulty capacitors with 1000uF at higher rating 25v. As long space is not a constrain on the board, it is good to put a higher rating capacitor into it.
I plug everything back together to try on a power up again but without mounting on the casing. I place a piece of cardboard below the PCB to avoid getting shorted by the LCD panel body.
The unit is able to power up with a bright AOC logo compared to initially was very dim. I assemble back the aluminium casing and the bezel. Assembling bezel was much easier than disassembling it. It should be a good sign!
And yes, the LCD monitor is revived with a minor repair. Although it’s good but now it is paired up as my extended monitor (secondary monitor) on my desktop. In conclusion, do not throw anything first, inspect and put a bit of effort that might revive it.
YH Wong is from Malaysia with a degree in Computer Engineering. Currently, work as a test engineer in semiconductor industry. Avid in troubleshooting & repairing electronic gadgets related.
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Note: You can check out his previous repair article in the link below:
https://jestineyong.com/panasonic-national-remote-control-fan-no-power-symptom/
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PARASURAMAN
November 28, 2016 at 8:52 am
Yes, I really appreciate your attitude! By throwing away things, we are abusing the toils of many fellow human beings! It is equivalent to throwing sick, handicapped or elderly people to a dump yard! Like human beings, these things should also be given as much attention as possible to revive it! Good job!
Robert Calk
November 28, 2016 at 11:15 am
Good job, YH. Too bad people are so quick to throw away devices.
Mark
November 28, 2016 at 11:40 am
Well done YH!
It is a shame that most things at the recycling depot or in landfill could be simply fixed and bought back into service. We really do live in a throw away society.
Keep up the good work!
Cheers
Mark
suranga Electronics
November 28, 2016 at 1:39 pm
Hi Mr. YH Wong
Very Nice This Repair job.
And Common Fault For The LCD / LED Power Supply.
Yogesh Panchal
November 28, 2016 at 3:12 pm
Congratulations!
for finding the culprit on opening the door.
Phil Kafesu
November 28, 2016 at 4:12 pm
Hi YH
Excellent job well done. Let's keep on saving gadgets from the dump.
Albert van Bemmelen
November 28, 2016 at 5:46 pm
Good repair YH. And replacing both faulty capacitors with higher 25V rating ones no doubt makes this repair longer lasting!
Ross Wedding
November 28, 2016 at 7:04 pm
Well done YH Wong Electos can be so trouble some
Humberto
November 29, 2016 at 12:56 am
Good repair. By the way, did you select the e-cap 1000/25v with the same temperature of the faulty e-cap?
Bulent NUR
November 29, 2016 at 3:38 am
God job and cheap repair. Thanks.
Rich Beinlich
November 29, 2016 at 3:53 am
Well done YH,
To make sure the monitor doesn't fail again I would of checked and replaced all the electrolytic capacitors on the power supply because I have been bitten before after making a repair and the capacitors that I checked to be good failed within in 6 months of the repair.
Raju varghese
November 29, 2016 at 3:32 pm
Hai Wong,
Good job well done ,
Victor Mash
November 30, 2016 at 3:08 pm
Good job sir cheers
Debirt Maynard
December 1, 2016 at 7:29 am
Good job YH. Like Rich Beinlich I would suggest changing all the suspect caps on the board.