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Old 07-26-2021, 03:59 AM   #4
mattie47
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Join Date: Jul 2021
City & State: Christchurch
My Country: New Zealand
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Posts: 5
Default Re: Dead Dell P2416db - No standby/power LED detected

Okay, some more thoughts towards a next step.


1. There's an ldo with marking GH16D. A google says this is really a AZ1117 - http://www.wsecl.com.tw/prd6/AZ1117C...8%20121130.pdf

Interestingly, there's no voltage with this on input. I'm not quite sure where perhaps it should be getting voltage either :-/

I'm trying to understand the pcb layout but I'm more or less a determined novice.

2. There's another part (I'm not sure what it is), but it seems to be reading 3.3v on both sides of it?? This doesn't sound right does it? Update: I see other ones of these components on the board are doing a similar thing.

Update: In my last pic, I highlighted a component with 5v on 2 of the 3 pins. I see the other pin on the left of it has continuity with the LDO's input pin. That component itself has marking "N5K1" (can't find anything on google for it).

It looks like it has D B G around it, which I'm guessing are Drain, Base, Gate ? In which case, this is a transistor. If that's correct, does it make sense that the Gate and Base are both seeing 5v?


Appreciate any thoughts on what I should consider doing next.

Thanks,

Matt
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Last edited by mattie47; 07-26-2021 at 04:35 AM..
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