ACER monitor screen fading to black/grey - likely hardware culprit?

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Repair guides for displays (or monitors) for computers or other devices with video output.

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JonKen @jonken5092

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Postato: 5 dic 2023

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ACER monitor screen fading to black/grey - likely hardware culprit?

I have an ACER XV340CK monitor which has developed an issue where, after some hours use, the screen fades to black/grey. This fading begins at the edges of the screen and moves to the centre of the screen. It takes maybe 1 second to fade completely,

The blue power LED remains on even when the screen has faded, and Windows still sees that the screen is connected and is attempting to send data to it.

The issue can be resolved by turning the monitor off for a few minutes, then back on. It is starting to happen more frequently - several times a day.

I've tried drivers and different cables, so 99.9% sure this is a hardware issue. It's out of warranty though and the cost of repair via a service centre is likely uneconomical.

Is this symptom commonly associated with a certain component - e.g. a power board, or TCOM - both boards are available on ebay so could be replaced? The power board in particular looks quite simple on the ebay pictures, so if the issue is commonly power board related, is there even a fix for that (e.g. is this be a sign of failing capacitors on that power board, etc).

I have the soldering equipment to do phone board repairs so could easily do part replacements on these boards if needed and could follow troubleshooting instructions with a multimeter if anyone experienced and competent has any ideas.

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jayeff @jayeff Rep: 450,9k 11 367 1,4k · Answer 1 · 2023-12-05T00:23:23-07:00

Hi @jonken5092

Try shining a flashlight at an angle close to the screen and check if you can see any images at all on the screen.

They will be very faint if they are there so trying this in a darkened room may help to see them.

If you can see images then there's a backlight problem with the display.

It could be a faulty LED that fails as it warms up, but given that the LED lights are usually connected in strips in an LCD display the other strips would stay on and there would be dark areas rather than the whole screen, but it might depend on the circuit design I suppose.

You could try using a backlight tester (examples only) and connect it to the LED strips power leads i.e. disconnect the LEDs from the power board and connect the tester directly to each LED strip circuit, to see if it is a strip or strips or the power board. The tester supplies the power for the LEDs and not the power board.

It could be either the LED backlights or the power board, but to test the LEDs individually, without a LED tester to be sure where it is, you would have to disassemble the monitor more than you would need to just replace the power board. Also if it is a faulty LED (or LEDs) sourcing individual LEDs is not easy as there may be a "brightness" difference between the original LED and the replacement, giving bright spots in the display. A quick search online didn't find any LED strips either, but it was only a quick look. If it is a strip then maybe replace the lot as if one has gone then the others may not be far away from failing either. Perhaps there is a part number on the strip which may make it easier to locate a replacement.

The monitor seems to be a fairly new model and a search online indicates that Acer have a 2 year warranty on monitors but this may be different where you are. If your monitor is still under warranty, get it repaired/replaced that way rather than opening it up to find out what's wrong and voiding the warranty.

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ACER monitor screen fading to black/grey - likely hardware culprit?

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