Electronics > Repair

Dell monitor died after power trip, comes back alive after a few weeks

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stan001:
Dear all,

I have this strange behaviors of an old Dell monitor ( Dell U2312HM ) that died ( totally no power ) after a sudden power trip ... and comes back alive a few weeks later...

The 1st time this happens, I ordered replacement parts for the display board ( the board have 2 boards - a power supply board and display board taking in various voltages from the power supply board )
I can confirm it was NOT the power supply board that died.

Anyone knows why this happens ?

Are there some type of "special fuse" that prevent it from powering up like PTC ??? And after a few weeks of discharged ... comes back alive again ???

How do I speed up the "discharged" to bring back the monitor alive again ?

Image of the display driver board..
Dell U2312hm

Thanks


Runco990:
Are you SURE about the power supply?  I have fixed a lot of dell monitors and it's pretty much ALWAYS capacitors.  I'd suspect the kick start capacitor on the power supply.  It's usually a small value one. 

RayRay:
Uh, how exactly can you "confirm" it's not the power board? Correct me if I'm wrong, but it is my understanding from your post that you've only replaced the display board (and not the power one too!) and it's very likely that the issue is on the power board. And FYI, this particular model has a common fault with the 3.3V voltage regulator (G1084-33) so that's prob the first thing you'd wanna check.

perieanuo:

--- Quote from: stan001 on June 13, 2021, 05:40:58 am ---Dear all,

I have this strange behaviors of an old Dell monitor ( Dell U2312HM ) that died ( totally no power ) after a sudden power trip ... and comes back alive a few weeks later...

The 1st time this happens, I ordered replacement parts for the display board ( the board have 2 boards - a power supply board and display board taking in various voltages from the power supply board )
I can confirm it was NOT the power supply board that died.

Anyone knows why this happens ?

Are there some type of "special fuse" that prevent it from powering up like PTC ??? And after a few weeks of discharged ... comes back alive again ???

How do I speed up the "discharged" to bring back the monitor alive again ?

Image of the display driver board..
Dell U2312hm

Thanks

--- End quote ---
no you can't unless you scoped your voltage rails
like others, my bet is on caps or some cold junction

stan001:

--- Quote from: RayRay on June 16, 2021, 07:49:32 pm ---Uh, how exactly can you "confirm" it's not the power board? Correct me if I'm wrong, but it is my understanding from your post that you've only replaced the display board (and not the power one too!) and it's very likely that the issue is on the power board. And FYI, this particular model has a common fault with the 3.3V voltage regulator (G1084-33) so that's prob the first thing you'd wanna check.

--- End quote ---

Previously I ordered both the power board and the display board, the power board was fine, I replaced both the display board.

Yes, I will order and swap out both the vreg ( G1084-33 ) first...

Thanks

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