Help with fully dead CECHC04 motherboard

[N3Star]

Hello everyone, a few days ago I got myself a bunch of old PS3 and among them was a BC mobo - CECHC04. The problem is that it's totally dead. The attachment which powers on the console doesn't even show a red light when PSU is connected. I am not sure if this is it, but on the back side (opposite to bga) solder pads, which I soldered to GND when I tried SYSCON reading (welp, I thought it had some juice in it) I accidentaly connected them together.

 

[N3Star]

I managed to cut the short I created, but still no power. I also measured the voltages coming to the CSW-001 board - on the connector there seems to be no sign of 1.6V, 3.3V or 2.8V, but 5V is present.

 

[N3Star]

Upon further testing it seems that the whole board is missing 3.3V, but 1.8V is present, so looking at the schematic I guess that the IC6003 (MB39A116PFT) or any other 3.3V regulator is dead.

 

[feng_ye]

Hi have you found anything after that? Have you check if it's the flex flat cable issue? I had the exact same model and same issue after a externalised PSU testing. I don't know where to start test with. All I can find is the pinout here: https://www.psdevwiki.com/ps3/CSW-001

 

[nCadeRegal]

Have you tried asking any of the guys in the syscon thread about your particular issue? Even the Frankenstein thread has the most knowledgeable people in the ps3 scene when it comes to shorts and components on the board itself. That's where I would ask about which ic in particular is giving you issues.

 

[N3Star]

I've found what was dead - it was main 3.3V step-down converter near the power button circuitry.

 

[feng_ye]

I've found what was dead - it was main 3.3V step-down converter near the power button circuitry.

Is that IC6005? I saw your post on badcaps. My test result is IC6005 only outputting 0.66V while 5.05V input is firm on both VIN and EN pin.

Unfortunately, during the live probing, I think I just shorted the PSU by touching both the EN pin and the fat capacitor pin to the north of it, which connects to GND, after hearing a slight click, then no 5V power at all later. Re-confirmed using another PSU, but that's another story for another thread I guess.

So if you can confirm it's IC6005 then much appreciated!

 

[N3Star]

Yeah, it's IC6005, I took mine from SEM-001 motherboard. Make sure you check for blown fuses first, there aren't that many to check, 6 if I recall correctly.

 

[feng_ye]

Thank you for confirming this. I'm pretty sure there's no blown fuses as the live probing gets some voltage but just not enough for 3.3V. I'll give it a go once I got proper gears for replacing smds.