CECHC04 (COK-002) YLOD - Power problem

[aronsky]

Hi to all! Sorry for language, i can not speak german, hope you will understand.
I tried to find solution on other forums, but nobody knows solution of my problem.
I got YLOD while tried to downgrade the console.
COK-002 have NAND and shorting tristate to gnd can exclude dump problem.
So, i disasembled console and made some starts - CPU, GPU and South Bridge left cold. I made GPU reflow on station - it gives no result.
After this i started voltage measuring in test points. Found problem with +5V_MISC and the source of the problem was broken PS6001.
I replaced it, but PS3 still YLODs.
I found testplan on this forum and this is what i got after measurements:

Fuse	Voltage measured	Voltage required
JL6063	1,20V	1,20V
JL6103	1,20V
JL6114	1,20V	1,20V
JL9654	1,60V	1,70V
JX9601	0	1,50V
JL6201	3,20V
JL6208	1,30V	1,30V
JL6048	1,80V	1,80V
JL9651	0,10V	1,20V
JL9656	0	1,50V
JL6058	3,30V	3,30V
JL6060	2,50V	2,50V
JL6061	1,8V	1,8V
JL9648	0,5V	1,20V
JX9602	0	1,50V
JL9647	1,80V	1,80V
JL9652	0.10V	1,20V
JL9655	0	1,55V

As we can see, JX9601, JL9651, JL9648, JX9602, JL9652, JL9655 have incorrect voltages.
Also, i don't know about JL6103 and JL6201, but looks like there zero voltage must be.

I checked all possible fuses, but i don't know what to do next.
Thanks for help.

[Dragoon]

eh lol, warum dann nicht einfach deutsch wenn man kein englisch kann??

[aronsky]

eh lol, warum dann nicht einfach deutsch wenn man kein englisch kann??

Sorry, i mean german, not english ))
Anyway this doesn't change the question.

[Takeshi]

Hi to all! Sorry for language, i can not speak english, [...]

Hi, you're not alone


If you get the YLOD while tristate is connected to ground, this isn't a software-failure, but a hardware-failure. This means you damaged the mainboard while downgrading.

(Nearly) all voltages are activated by the syscon. If any voltage is missing, there could be an error (shortcut or something) or the syscon is shutting down the console (due to another error) before the voltage gets activated.