820-00165 No Image/Chime No USB

[tlough75]

So I have another 820-00165 with no image. PP3V3_ SUS is 3.3V. I'm getting voltages on coils. The CPU on this board does get warm but I get no USB activity what so ever. Board is on bench with nothing else plugged in.

 

[2informaticos]

Do you get even VCORE?
Check all voltages from pages 57/58.
Also check voltage on the L/C blocks between CPU and board edge.

Do you get PLT_RESET_L and PLT_RST_BUF_L too?
Did you try known good BIOS?

 

[tlough75]

I get 1.8v on vcore. Will post back with results of tests of all power rails. Have not tried new bios.

 

[tlough75]

I got 3.3V on both PLT_RESET_L and PLT_RST_BUF_L.

 

[tlough75]

I checked every rail from pages 57, 58 & 62. All are present. the only thing "missing" was for PPHV_S0SW_LCDBKLT which I assume is not present due to the board not posting. I am going to reflash BIOS next...

 

[tlough75]

Pretty sure BIOS is corrupt. I have 4 more 820-00165 boards and the Medusa can copy bios to it but the board in question got stuck at 67% and then I tried it again and it won't even start. At that point do you just take a known good BIOS from another board with the same model number and then just change serial, FSYS and ME region?

 

[2informaticos]

You can re-use original ME region if was not already f***d off; just try.
If you cannot read/write SPI chip onboard, remove it and do it with normal programmer.

I bet few clean ME files are already posted on the forum.

 

[tlough75]

Tried to clean original ME, did not work. Medusa gives me error. Will try normal programmer.