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PB287Q Partial backlight

KNP
Level 7

Hello Community,

I have this monitor with a backlight problem that I'd like to revive. When the monitor is cold, only parts of the backlight lights up. After maybe 30 minutes when the monitor has time to heat up, if I power cycle multiple times using the power button the backlight is sometimes restored fully.

I opened the monitor to inspect the power supply board, and even thought none of the capacitors where bulged, I replaced them anyway. But that did not fix the problem.

Any idea what might be the problem?IMG_20230131_083401.jpg

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1 REPLY 1

KNP
Level 7

I did a bunch of probing with a multimeter and the problem is either the OZ9998HGN (4-led strip controller) or one of the led strips themselves.

I'll order first the IC and replace it to see if that fixes the problem.