Caps discoloring

Runnerboys

Mordex

Join Date: Dec 2021

Posts: 7

Country: USA
#1

Caps discoloring

11-06-2022, 10:42 PM

Hi all,

I'm new here, trying to get some help with a repair
We found a short on the PPVDD_GPU

I want to hope it's only bad capacitors, the attached pic shows the short area
Getting 0V on all caps marked in red

Other areas of the board seem to get the correct Voltages

Can I assume the problem is with a burned cap?
Will try to send direct Voltage to a cap in the circuit and check what gets hot first

If we find a bad cap and replace / remove it, and assuming problem consists, what would be the next step for the troubleshoot?
Also sending a pic of the caps in question, some are discoloredhttps://ibb.co/tZxj2sV but I don't know if that's normal or that's an indication for bad caps

tnx in advance
Tags: None
Runnerboys

Mordex

Join Date: Dec 2021

Posts: 7

Country: USA
#2

11-06-2022, 10:49 PM

Re: Caps discoloring

please see attached pics
Attached Files
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stj

Great Sage 齊天大聖

Join Date: Dec 2009

Posts: 30993

Country: Albion
#3

11-07-2022, 05:16 AM

Re: Caps discoloring

i must have missed the part where you told us what you are repairing
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Runnerboys

Mordex

Join Date: Dec 2021

Posts: 7

Country: USA
#4

11-07-2022, 08:52 AM

Re: Caps discoloring

Sorry for that
It's for an iPad 11 2nd gen
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PeteS in CA

Badcaps Legend

Join Date: Aug 2005

Posts: 3579

Country: USA, Unsure of Planet
#5

11-07-2022, 02:53 PM

Re: Caps discoloring

Not all MLCCs are the same outer color.

PeteS in CA

Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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Runnerboys

Mordex

Join Date: Dec 2021

Posts: 7

Country: USA
#6

11-07-2022, 04:44 PM

Re: Caps discoloring

thanks,
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