PS3 FAT NEC/TOKIN Resistance Testing, need help interpreting values

[jkucukov]

I'm in process of diagnosing the yellow light of death symptom on my PS3 FAT console CECHG01, in process of getting the Arduino gadget to be able to access Syscon and be able to read fault codes. In the meantime, I'm trying to measure resistance of the NEC/Tokins while still attached to the board. I took the Ohm readings from each of the NEC/Tokins from front and back of the board (4 from the RSX and 4 from the CPU chips).

What I gathered in the attached pictures are values from the CPU NEC/Tokins are consistently measuring 1.6 Ohms while on the RSX they measure 3.4 Ohms except for two places where its open circuit (OL) no measurements. I understand that these are like capacitors and are hard to measure on the board. I hope somebody more experienced can tell me if what I'm seeing is a set of bad NEC/Tokins on the front side of the board or a bad RSX chip?

[stj]

[jkucukov]

Thank you for sharing, the values I was able to pull from looking at the shared diagram is as follows:
RSX_VDDIO = 85.2 Ohms
RSX_PLL = 5.78 kOhms
RSX_VDDC = 4.1 Ohms

Keeping my fingers crossed 😊

[stj]

values will be different for a "G" board because they use 65nm chips instead of 90nm

[jkucukov]

values will be different for a "G" board because they use 65nm chips instead of 90nm

I thought the board had a 90nm RSX chip per the psdevwiki site that showed all the SEM-001 boards had them, and tanks to you I realized from the back side that there are 5 rows & 6 columns of capacitors (30) behind the RSX chip which makes sense it to be a 65nm unlike the 90nm would have been 5 rows and 7 columns (35).

I'm completely guessing if that's a tell unless one was to delid the heat plate to confirm the die size:

CECHG01 CECHA01

[jkucukov]

I was completely wrong on in my previous post, the capacitor count on the back side of the mother board was of the CPU not RSX

[jkucukov]

I was able to pull internal Syscon error log both external and internal per the Psx Place tutorial from Rip-Felix.
It was very interesting process of wiring it all up and getting it all to read and work, took about 30 min of fiddling to get it to generate the output that I copied to the attached Notepad txt file.

External codes and internal codes both show 3034 indicating bad RSX chip.

The console has 100 days of operation and I also pulled data for the bringup and shutdown several times.

[stj]

it could be bad tokin's on the rsx

[jkucukov]

it could be bad tokin's on the rsx

I thought bad NEC/tokin with RSX had to have 1002 in the list, in my case I only see two codes 3034 and 4422.

[stj]

if the power isnt smooth the rsx cant run properly.
this is where a scope is handy