Aller au contenu 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?

Répondre à cette question J'ai le même problème

Cette question est-elle utile ?

Indice 0

Commentaires:

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

par

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

par

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

par

Ajouter un commentaire

4 solutions

Réponse la plus utile

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

Cette réponse a-t-elle été utile ?

Indice 1

Commentaires:

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

par

Ajouter un commentaire

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

Cette réponse a-t-elle été utile ?

Indice 1
Ajouter un commentaire

Hi friend, this is the Q9 component.

https://imgur.com/RCT0Wpo

Cette réponse a-t-elle été utile ?

Indice 0

Commentaires:

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.

par

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!

par

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

par

@cabe94 Power supply board defective perhaps?

par

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

par

Ajouter un commentaire

Hi,

This might be the component that you are looking for.

Block Image

Cette réponse a-t-elle été utile ?

Indice 0
Ajouter un commentaire

Ajouter une réponse

moybryan3 sera éternellement reconnaissant.
Afficher les statistiques:

Dernières 24 heures : 1

7 derniers jours : 9

30 derniers jours : 23

Total : 421