Chosen Solution
Part closeup https://imgur.com/a/IAa92ta Board itself https://imgur.com/a/d4hkzME I have an ASUS VG278Q 27" 144Hz gaming monitor that recently crapped on me. I’ve found the part that failed but am having difficulty identifying a part number. Haven’t had any luck looking up part numbers through googling. This form factor tends to be a MOSFET, voltage regulator or diode . I’m guessing transistor based on the Q9 reference designator but then it makes me wonder what kind? NFET or PFET? Or even BJT? The only things I can seem to make out are “21…” Any suggestions on how to find the replacement part?
Have you tried looking for a replacement board? There is a board number usually printed on the PCB.
Hi friend, this is the Q9 component. https://imgur.com/RCT0Wpo
Hi, Here’s a link to a supplier of mainboards and other major parts for the monitor. There are two different models i.e. VG248QE and VG248QG. Click on the appropriate model number and then click on the mainboard entry to see details regarding the Asus part number. If you search online using the part number only there are other suppliers or just use the supplier linked. Did you try searching for the board number schematics? My eyes are gone even when zoomed in I can’t make out more than 4H 3QTG4.A00 but I’m not confident that this is correct as nothing even remotely shows up when searching using that number or other close variations
Hello, I just now had success getting my 278Q working again! Here is what I did. Inspired by a youtube video (search for 278Q whitescreen) I first looked at the fuse and MOSFET on the LCD board. The fuse was not blown but the MOSFET seemed to be bad (though not visibly blown). I did not have a tiny surface mount replacement MOSFET so I instead soldered very fine wire wrap wires onto the three pads and fed that out to a large, discrete IRF540N MOSFET. This may have been necessary for the repair but was not sufficient. I tested power on the LCD board at the 12V test point and it was 1.1V. (I should have done this first.) Then I opened up the main board behind the metal shield. There was an obvious visibly blown component in the same spot as the initial post on this thread (Q9). I cleaned that away and again soldered fine wire wrap wires to the three pads and fed those to another external large IRF540N. To my great surprise, no more whitescreen of death, and the ASUS logo came up!
Hi, This might be the component that you are looking for.
