820-00840 no boot

[Sr. Robot]

820-00840 with no signs of damage.

PPBUS_G3H is 13v.

board is missing PP3V3_S0 and PP5V_S0.

PM_EN_S0_SW is 0v.

R7889 and R7827 have correct values.
PMIC_PGH is missing

 

[2informaticos]

What about 3V3_S5/SUS?

 

[Sr. Robot]

3V3_S5 present

PP3V3_S5G not present

 

[2informaticos]

Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L.
Be sure PM_RSMRST_L is always high.

 

[Sr. Robot]

PM_RSMRST_L is 0v.

PM_PWRBTN_L is 3.3v and drops when triggering SMC_ONOFF_L. On the third trigger ppbus goes down to 1.6v

 

[2informaticos]

Check diode mode to ground on all coils; compare with good board.
Also check at all power rails from page 64.

 

[Sr. Robot]

	Bad board	Good Board
L8030	0.100	0.160
L7960	0.016	0.040
L7900	0.000	0.016
L8060	0.000	0.016
L7370	0.002	0.002
L7220	0.001	0.003
L7210	0.001	0.003
L7420	0.001	0.001
L7410	0.000	0.001
L7430	0.001	0.001
L7730	0.125	0.121
L7030	0.407	0.417
L8410	0.734	0.774
L7690	0.329	0.324
L7670	0.393	0.394

I didn't see any notable except maybe on L8030

bad board/good board
PP1V_S5GTD = 0.000 / 0.0017
PP1V_S5G_FUSE = 0.413 / 0.417
PP1V_S3 = 0.145 / 0.190
PP1V_S0G = 0.101 / 0.157
PP1V2_S0G = 0.100 / 0.170
PP1V2_S3 = 0.100 / 0.170
PP1V8_S3 =1.92 / 0.256
PP1V8_S0 = 0.298 / 0.310

 

[2informaticos]

"I didn't see any notable"
Apart of L7900 and L8060???
Dead PCH...