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Old 07-24-2021, 08:07 PM   #1
mattie47
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Join Date: Jul 2021
City & State: Christchurch
My Country: New Zealand
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Posts: 5
Default Dead Dell P2416db - No standby/power LED detected

Hi all,

I got given a dead Dell P2416db monitor, and I've been trying to see if I can fix it (and save it going to landfill).

I get no standby LED detected once power is connected, nor any other form of light out of the screen.

- Thus far, I detect 19v on the PSU output pins, however there is a high pitch scream coming from one or two caps (see image 1 - I know these should be replaced, but given).
- Numerous step down converters around the circuit are reporting voltage
- One is not, I have highlighted this in the top right of image 2.


Most stepdown converters on the board are IACEG - Google suggests MP2144: https://www.monolithicpower.com/en/d...ocument_id/436

There's one IAGCF which google suggests to be the MP2315: https://www.openhacks.com/uploadspro...tasheet_77.pdf

As mentioned above, I was surprised to not see anything on VCC (046.9mv) or SW (012.0mv), however for SW I'm guessing this could be because EN was only 1v (below 1.5v threshold).

Any ideas for how I should process next?

Edit: I've attached pics 1 and 2 in a zip file since the forum compresses them and it's hard to read the text I've written on them. There's another zip also of other raw pics.

Thanks,

Matt
Attached Images
File Type: jpg 1.jpg (658.8 KB, 12 views)
File Type: jpg 2.jpg (963.8 KB, 11 views)
Attached Files
File Type: zip screen.zip (27.97 MB, 2 views)
File Type: zip pic1and2.zip (9.36 MB, 3 views)
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