ps5 edm-010 blue light + beep but missing 1.8v and 3.3v standby voltages at hdmi IC

[hellomyps5isded]

Hi can someone help me diagnose further than I have. I am confused why I am missing 1.8v + 3.3v rails around the hdmi.

PS5 has 12v, 5, 3.3v 1.8v and various other rails but is unable to complete post. No blown fuses, no shorted rails, no visual damage, some work has been done to the board previously.


front hdmi - missing multiple 1.8v and 3.3v

rear hdmi - again missing 1.8v, 3.3v

top left southbridge - these standby voltages are missing

lower left southbridge - weird, reading 0.2v but should be 0v standby and very bottom 3.254v expected but reading 0.995v

Post automatically merged: Mar 11, 2023

@jkyoho sorry to summon you, do you see anything here I am missing?
I have tested multiple step down ICs PMICs around the board, all are testing ok, inline with known good standby voltages from a working board. I do not understand the logic of this hdmi ic circuit.

 

[numbug]

Didi you find a solution? I have the exact same issue!

 

[frostieff]

Game Console Repair Legion on facebook group has a whole bunch of repair people who can help you with this

 

[jkyoho]

Hi can someone help me diagnose further than I have. I am confused why I am missing 1.8v + 3.3v rails around the hdmi.

PS5 has 12v, 5, 3.3v 1.8v and various other rails but is unable to complete post. No blown fuses, no shorted rails, no visual damage, some work has been done to the board previously.


front hdmi - missing multiple 1.8v and 3.3v
View attachment 358385

rear hdmi - again missing 1.8v, 3.3v
View attachment 358386

top left southbridge - these standby voltages are missing
View attachment 358387

lower left southbridge - weird, reading 0.2v but should be 0v standby and very bottom 3.254v expected but reading 0.995v
View attachment 358388

Post automatically merged: Mar 11, 2023

@jkyoho sorry to summon you, do you see anything here I am missing?
I have tested multiple step down ICs PMICs around the board, all are testing ok, inline with known good standby voltages from a working board. I do not understand the logic of this hdmi ic circuit.

Sorry for coming on reply late, my notification alert spoiled with pFly these days.
Do you see 3.3v and 5V on other fuse area like F7002, F7502, F7003 ETC?

 

[rambonz]

I have almost the exact same symptoms on my boards.

 

[Greyffm]

Hello, I have the same problem, is there a solution now?

 

[rambonz]

Yes. It will most likely be the south bridge.

Long story short, the 3.3v line to the right of the HDMI encoder is an enable line. This comes from the SB. The input 1.8v to the y09k2 also comes from the SB It will impact many if not all of the missing voltages. I mapped out some of the pad readings a little while back as I was trying to solve this and replacing SB and resetting the crystal oscillator fixed this for me.

 

[MaxCaps]

Hi all. I have two boards that are presenting themselves with the same failure mode (missing south bridge standby voltage, 1.8v and 3.3v along the hdmi circuit). One of the boards has a dead short on the APU, the other can’t find any shorts. I changed the hdmi encoder on the board with no shorts even though it didn’t appear to be faulty, no change. Is it possible the south bridge is shutting down the PS5 prior to enabling the hdmi circuit? I do not have a known good south bridge to try

 

[bramo]

how can i test a SB ????

 

[Johnny_debt]

how can i test a SB ????

Check initialization current when applying 12v.

 

[bramo]

it go tio 292 mamps then go back to 0.07 mamps

is dat good boot

 

[Johnny_debt]

it go tio 292 mamps then go back to 0.07 mamps

is dat good boot

Sounds good. Do you get blue light when hitting power?

 

[bramo]

yes 1 beep 1 second blue light then noting

 

[Johnny_debt]

yes 1 beep 1 second blue light then noting

You have a general power failure somewhere, could also be ram. These are hard to fix if you don't find any obvious shorts.