4/11/2023 0 Comments Acer s271hl monitor driver![]() Eventually or immediately the last light would go dark. The symptoms: turned on fine, but after a few minutes or less one or more backlight segments would go dark, leaving the monitor with only part of the bottom edge illuminated, as if with spotlights on a wall at night. The datasheet for the MP3394 LED controller was of great help in understanding operation. First I found that there's very little information about problems, repair, or available parts for this model. I saw this broken Acer S271HL bid monitor on craigslist for $30 and figured I'd give repairing it a shot. Fix is to run extra ground wire to that point. Via for ground to resistor divider of voltage feedback would heat up from nearby inverter components, and ground voltage would jump several tenths of a volt, triggering overvoltage and disabling LED strings until all were off. Tl dr: LED driver board's vias were faulty and would gain tens of ohms when board heated up.
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