Saltar al contenido principal

Identifying and Replacing component "Q9" on Asus VG278Q

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?

Contesta esta pregunta Yo también tengo este problema

Es esta una buena pregunta?

Puntuación 0

Comentarios:

Hi! How did you disassembly this monitor? I am trying on mine but a black tape is hard attached to the bezel.

- de

It is really frustrating to try and disassembly it. There are some kind of tab/hooks that hold the frame together. You need to put a thin spudger to put pressure and widen the gap until the hooks undo themselves.

I'm not sure what tap you're referring to

- de

Hi moybryan3. Sorry, i meant "tape", black tape.

- de

Agregar un comentario

4 Respuestas

Respuesta Más Útil

Have you tried looking for a replacement board? There is a board number usually printed on the PCB.

Fue útil esta respuesta?

Puntuación 1

Comentarios:

Unfortunately couldn't find a single vendor that sold the board.

- de

Agregar un comentario

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

Fue útil esta respuesta?

Puntuación 1
Agregar un comentario

Hi friend, this is the Q9 component.

https://imgur.com/RCT0Wpo

Fue útil esta respuesta?

Puntuación 0

Comentarios:

Awesome that you got me that picture. Unfortunately shorting drain to source of that "FET(?)" didn't work and neither did using an alternative part so I'm out of ideas since it is two nested FETs and controlled gate by the center CPU. The power rails looked good but I just keep getting white screens.

- de

Hi moybryan, this is what I found on my board (Asus VG279Q) its almost the same layout:

https://imgur.com/a/hm9Vq1x

Q9s marking is: 21J19

Hey btw. do you still own the pcbs? Because I got a blown resistor on the power board and I can't read the marking any more... would be awesome!

- de

any luck with fixing it ? i have the same issue, got another main board and it blew again :(

- de

@cabe94 Power supply board defective perhaps?

- de

Unfortunately I wasn't able to fix it. It's sitting in storage until I have a stroke of genius or one of us figures it out. The power supply measured proper voltage on my meter. I measured the power rails on the board itself and had no luck.

I tried to just bridge the SD connection ignoring the gate but had same result. I'm expecting that something else is the cause and didn't want to go down this rabbit hole any further

- de

Agregar un comentario

Hi,

This might be the component that you are looking for.

Block Image

Fue útil esta respuesta?

Puntuación 0
Agregar un comentario

Añadir tu respuesta

moybryan3 estará eternamente agradecido.
Ver Estadísticas:

Ultimas 24 horas: 2

Ultimos 7 días: 14

Ultimos 30 días: 42

Todo El Tiempo: 506