mbcontrol
Member
The first time i was working on this board it had kernel panic issues and was always rebooting. It was an apple refurbished board in bad condition. There was a long screw in a short hole on the left side of J8500 and the right side of J6600. The BIOS U6100 had a short to GND at pin8. I changed the BIOS and a view other bad looking parts and did a ultrasonic. After this the board was running for a view month.
Now the machine came back with randomly rebooting issue. I was testing it over days and weeks. Sometimes the machine was running over days without any problems. Sometimes it didn't wake up after closing and opening the lid. Sometimes it did nothing like dead. And then after sac-reset etc. it was working again.
I can't find any visual damage. At the moment i stuck with this board. The naked board is booting and shows the low battery symbol for 5-10 seconds on a external display, then it gets a blank screen and most of the rails are down.
Here are my measurements - measured at the time the low battery symbol is shown on the screen (ore before):
PPDCIN_G3H = 20,4V
PPBUS_G3H = 13,08V
PP5V_S5 = 5,01V
PP3V3_G3H = 3,40V
PP3V3_S4 = 3,31V
PP3V3_S0 = 3,31V
PP1V8_S3 = 1,78V
PP1V2_S3 = 1,18V
PPVTT_S0 = 0,58V
PP0V6_S3_MEM_VREFDQ_A = 0,60V
PP0V6_S3_MEM_VREFCA_A = 0,60V
PP0V6_S3_MEM_VREFDQ_B = 0,60V
CPU Rails
PPVCCCPU_S0G = 0,9 / 0,7 / 0,62V
PPVCCSA_S0G = 1,03 / 0,7 / 0,83V
PPVCCGT_S0G = ---
PP1V2_S3 = 1,18V
PPVCCIO_S0G = 0,94V
PP1V_S3 = 0,98V
PP1V_S0G = 0,98V
PP1V2_S0G = 1,18V
PCH Rails
PP3V1_RTC = 3,07V
PP3V3_S5 = 3,31V
PP3V3_S5G = 3,31V
PP1V_S5G = 0,99V
PP1V8_S5G = 1,78V
PPVCCPCH_S5G = 0,99V
PP1V_S5GTD = 0,98V
PP1V8_S0 = 1,78V
PP3V3_S0 = 3,31V
PP3V3_S4 = 3,31V
SSD Rails
PP3V3_S5_SSD_SNS = 3,31V
PP3V3_TBT_X_S0 = 3,31V
PU_VSNS_CPU_VCCGTX_TP = ---
PD_VSNS_CPU_VCCGTX_TN = ---
PP3V3_S4_WLS = 3,32V
PPBUS_G3H_TPAD = 13,09V
PP5V_S0 = 5,11V
PPBUS_G3H = 13,09V
USB-C GLOBAL POWER ALIASES
PP3V3_UPC_XA_LDO = 3,38V
PP3V3_UPC_XB_LDO = 3,38V
PP5V_S4 = 5,11V
Now the machine came back with randomly rebooting issue. I was testing it over days and weeks. Sometimes the machine was running over days without any problems. Sometimes it didn't wake up after closing and opening the lid. Sometimes it did nothing like dead. And then after sac-reset etc. it was working again.
I can't find any visual damage. At the moment i stuck with this board. The naked board is booting and shows the low battery symbol for 5-10 seconds on a external display, then it gets a blank screen and most of the rails are down.
Here are my measurements - measured at the time the low battery symbol is shown on the screen (ore before):
PPDCIN_G3H = 20,4V
PPBUS_G3H = 13,08V
PP5V_S5 = 5,01V
PP3V3_G3H = 3,40V
PP3V3_S4 = 3,31V
PP3V3_S0 = 3,31V
PP1V8_S3 = 1,78V
PP1V2_S3 = 1,18V
PPVTT_S0 = 0,58V
PP0V6_S3_MEM_VREFDQ_A = 0,60V
PP0V6_S3_MEM_VREFCA_A = 0,60V
PP0V6_S3_MEM_VREFDQ_B = 0,60V
CPU Rails
PPVCCCPU_S0G = 0,9 / 0,7 / 0,62V
PPVCCSA_S0G = 1,03 / 0,7 / 0,83V
PPVCCGT_S0G = ---
PP1V2_S3 = 1,18V
PPVCCIO_S0G = 0,94V
PP1V_S3 = 0,98V
PP1V_S0G = 0,98V
PP1V2_S0G = 1,18V
PCH Rails
PP3V1_RTC = 3,07V
PP3V3_S5 = 3,31V
PP3V3_S5G = 3,31V
PP1V_S5G = 0,99V
PP1V8_S5G = 1,78V
PPVCCPCH_S5G = 0,99V
PP1V_S5GTD = 0,98V
PP1V8_S0 = 1,78V
PP3V3_S0 = 3,31V
PP3V3_S4 = 3,31V
SSD Rails
PP3V3_S5_SSD_SNS = 3,31V
PP3V3_TBT_X_S0 = 3,31V
PU_VSNS_CPU_VCCGTX_TP = ---
PD_VSNS_CPU_VCCGTX_TN = ---
PP3V3_S4_WLS = 3,32V
PPBUS_G3H_TPAD = 13,09V
PP5V_S0 = 5,11V
PPBUS_G3H = 13,09V
USB-C GLOBAL POWER ALIASES
PP3V3_UPC_XA_LDO = 3,38V
PP3V3_UPC_XB_LDO = 3,38V
PP5V_S4 = 5,11V
