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EDM-010 - 80800014 - TPM 2.0 chip / power failure

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jacobtc

jacobtc

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I have this EDM-010 which I know is a very low firmware, however I can't figure out the fault. It turns on blue, one sec and then off. UART gives me 80800014 - TPM 2.0 chip / power failure. I've checked VCC on the TPM and I get 0v, so not power is going there. I checked 1.8V out of the DA9065 and I get 1.8V. I just reballed the Southbridge as it looked slightly crooked since last time I worked on this machine, but still no go. I can't find any shorts on the board either.
I believe it worked shortly when I purchased it as semi defective a couple years ago, but it just stopped booting after two or three boots.

I checked following this image, and I am missing all 1.8V lines here:


I then measured around the TPS buck converter, and I measure 0.6V on the 0.04V pad:


I noticed that when I was measured this point, the system would reboot - Going from 290mah to 0mah, see the video here:
 
If you disrupt the mosfet controller and the mosfet briefly stops generating 5V, the southbridge will stop. Once the 5V is restored, the southbridge will restart.

The power input at the TPM is (at pins 8 & 22) 3.3V_SS_PG2 and only present after start button.
 
stetofix said:
If you disrupt the mosfet controller and the mosfet briefly stops generating 5V, the southbridge will stop. Once the 5V is restored, the southbridge will restart.

The power input at the TPM is (at pins 8 & 22) 3.3V_SS_PG2 and only present after start button.
Click to expand...
Yeah, I just measured and get 3.3V when DC is connected, but it stops after a couple seconds.

Not sure what to troubleshoot next. I don't get the 1.8V rails as mentioned in the OP, but should those only be present at start button press?
 
At the TPM chip the 3.3V is only present for the first check after DC connected and than after start button press.

The 1.8V rail on the back of HDMI chip are also only present after start button press.

HDMI_lines_SideB_pwr.png


Your amp readings aprox. 3 mA in the end are to low. They should read around 7-10 mA.

I would check the readings around the TPM chip:

TPM_readings.png
 
There seems to be an issue with the power line.

Pin 8 & 22 are 3.3V_SS_PG2 and pin 17 and pin20 are each connected with a 4.7 kOhm resistor to this line.
I would check the both resistors for correct readings.

tpm_ic_R5145.png


tpm_ic_backside_R5144.png
 
Both are 4.5 kohm

Also did a reflow of the TPM, but no change.

Also, I do get 3V3 on Pin 8 and 22 when applying power, but goes away after a couple seconds.
 
Last edited by jacobtc,

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