Author Topic: Repair of Acer H223HQ monitor.  (Read 1591 times)

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Offline ZaXaZ

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Repair of Acer H223HQ monitor.
« on: May 31, 2016, 01:10:07 pm »
My monitor keeps "rebooting" some times a lot sometimes not that many times. but i don't see anything screaming dead component on the power supply.
i'm assuming its the power supply sins it's turning fully off and on, showing acer logo.

Top of board
[img=https://s33.postimg.org/l0sstlcy7/DSC00424.jpg]pictures upload
underside of board
[img=https://s33.postimg.org/kljp3gnz3/DSC00426.jpg]image hosting free
is it worth bothering with or just buy this replacement?
eBay auction: #http://www.ebay.com/itm/New-LCD-Power-Supply-Board-Acer-4H-0K302-A02-NO-repair-KIT-/291776931669?hash=item43ef42a755:g:8wMAAOSwKIpWC8Fm
 

Offline wraper

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Re: Repair of Acer H223HQ monitor.
« Reply #1 on: May 31, 2016, 01:44:31 pm »
Please explain what you mean by rebooting. Does it show splash screen on each "boot"?
 

Offline ZaXaZ

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Re: Repair of Acer H223HQ monitor.
« Reply #2 on: May 31, 2016, 08:54:52 pm »
It atc as if i would turn if off, and on. but with no interaction from my side.
 

Offline wraper

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Re: Repair of Acer H223HQ monitor.
« Reply #3 on: May 31, 2016, 09:03:59 pm »
Probably some of the few smallest electrolytic caps is faulty, however IMO it might be something as stupid as faulty power switch. Tact switches tend to become conductive between contacts and start acting weirdly. Try to disconnect the board with power switch and see if it stops switching off/on.
« Last Edit: May 31, 2016, 09:07:10 pm by wraper »
 

Offline samnmax

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Re: Repair of Acer H223HQ monitor.
« Reply #4 on: June 01, 2016, 08:37:54 am »
I have a Benq monitor with the same problem, sometimes it starts turning off and on without touching it.
The issue is that they use an ADC pin in the microcontroller for all the buttons, using a resistive divider. With time, buttons become slightly conductive (in the order of kOhms), and this screws up the voltages read by the ADC, triggering spurious button presses. As wraper said, try disconnecting the button board to see if that's the problem.
 

Offline ZaXaZ

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Re: Repair of Acer H223HQ monitor.
« Reply #5 on: June 02, 2016, 07:45:49 am »
Probably some of the few smallest electrolytic caps is faulty, however IMO it might be something as stupid as faulty power switch. Tact switches tend to become conductive between contacts and start acting weirdly. Try to disconnect the board with power switch and see if it stops switching off/on.

Sounds like a cheaper solution if it works :D will try it out
 


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