Repair of Acer H223HQ monitor.

[ZaXaZ]

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

[wraper]

Please explain what you mean by rebooting. Does it show splash screen on each "boot"?

[ZaXaZ]

It atc as if i would turn if off, and on. but with no interaction from my side.

[wraper]

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.

[samnmax]

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.

[ZaXaZ]

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 will try it out

[Zorang]

I know that this topic was inactive for some time but it is spot on for my problem..
Also have Acer H223HQ with random restart problem. It appears that faulty button board is cause of restarting. When I disconnect it, no more restarts.

[wraper]

I know that this topic was inactive for some time but it is spot on for my problem..
Also have Acer H223HQ with random restart problem. It appears that faulty button board is cause of restarting. When I disconnect it, no more restarts.

Replace all switches on that board.

[MathWizard]

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.

I'll have to remember that, so far I've not worked on the button area's of anything modern, and I have stuff junk parts like control pad's from TV's/printer's that are probably way more complicated than just a few push switches.