Hello,
I'm trying to diagnose this board with no power.
The board was originally brought in for water damage. Corrosion was not very bad and the board was successfully repaired by a quick ultrasonic cleaning. All corrosion was very surface level and no solder repair was needed at all. No oxidized components can be seen. Customer took the laptop home and it worked fine until it was brought back for warranty. Customer was watching youtube when it suddenly shut down. Customer says last time she tried turning it on it would turn on after a very long while but gave some kind of error. During my own testing I THINK i saw the board try to power on once but have not been able to replicate the customers claim that it would sometimes try to turn on after a long while of waiting
I tried DFU restore but got error 9xFCA (4042) "Gave up waiting for device to transistion from DFU state to DFU state".
I am unsure of the most efficient workflow to test voltages on these boards so I went off the sequencing diagram from 820-01598.
Current consumption
Starts at 5V .245A when plugging into charger-seems normal
Then transitions to 20V 0.054A and just sits there, no boot.
On occasion the current "dips" and it seems like the board trying to boot.
It will go: 20V 0.00A then 20V 0.035A then 20V 0.075 then it will go back to 20V at 0.054A like at the beginning and sit there again. The cycle repeats every 15 seconds or so.
Same behavior on all ports.
Sequencing Diagram
PPBUS_G3H 12.59
PP3v3_G3H 3.37
PP3V3_G3H_RTC 3.38
PP5V_G3S 5.15
PP3V3_S5 0V
PP5V_S4 0V
PP1V8_SLPS2R 1.8
PP1V8_AWAKE 1.8
PP1V8_SLPS2R_PMUGPIO 1.8
PP1V1_SLPS2R 1.1
PP0V8_SLPS2R 0.79
PP0V82_SLPS2R 0.82
PP3V3_AWAKE 3.36
PPVDDCPUSRAM_AWAKE 0.80
PP0V9_SLPDDR 0.9
P1V1_SLPDDR_SOCKET_EN 1.1
PP1V1_SLPDDR 1.1
PP1V2_AWAKE
PPVDD_CPU_AWAKE 0.75
PMU_SYS_ALIVE 1.78
PMU_ACTIVE_READY 1.78
PMU_COLD_RESET_L 1.79
PMU_PVDDMAIN_EN 3.38
P3V3MAIN_PGOOD 3.25
PP3V_G3H_RTC 3.00
PMU_CLK3K_PCH (unkown)
PCH_RTC_RESET_L 3.00
P5VG3S_EN 3.38
PP5V_G3S 5.15
P3V3G3S_EN 1.8
PP3V3_G3S 3.38
P1V8G3S_EN 1.8
PP1V8_G3S 1.8
P5VG3S_PGOOD 1.78
PMU_CLK (unkown)
Any help is appreciated!
I'm trying to diagnose this board with no power.
The board was originally brought in for water damage. Corrosion was not very bad and the board was successfully repaired by a quick ultrasonic cleaning. All corrosion was very surface level and no solder repair was needed at all. No oxidized components can be seen. Customer took the laptop home and it worked fine until it was brought back for warranty. Customer was watching youtube when it suddenly shut down. Customer says last time she tried turning it on it would turn on after a very long while but gave some kind of error. During my own testing I THINK i saw the board try to power on once but have not been able to replicate the customers claim that it would sometimes try to turn on after a long while of waiting
I tried DFU restore but got error 9xFCA (4042) "Gave up waiting for device to transistion from DFU state to DFU state".
I am unsure of the most efficient workflow to test voltages on these boards so I went off the sequencing diagram from 820-01598.
Current consumption
Starts at 5V .245A when plugging into charger-seems normal
Then transitions to 20V 0.054A and just sits there, no boot.
On occasion the current "dips" and it seems like the board trying to boot.
It will go: 20V 0.00A then 20V 0.035A then 20V 0.075 then it will go back to 20V at 0.054A like at the beginning and sit there again. The cycle repeats every 15 seconds or so.
Same behavior on all ports.
Sequencing Diagram
PPBUS_G3H 12.59
PP3v3_G3H 3.37
PP3V3_G3H_RTC 3.38
PP5V_G3S 5.15
PP3V3_S5 0V
PP5V_S4 0V
PP1V8_SLPS2R 1.8
PP1V8_AWAKE 1.8
PP1V8_SLPS2R_PMUGPIO 1.8
PP1V1_SLPS2R 1.1
PP0V8_SLPS2R 0.79
PP0V82_SLPS2R 0.82
PP3V3_AWAKE 3.36
PPVDDCPUSRAM_AWAKE 0.80
PP0V9_SLPDDR 0.9
P1V1_SLPDDR_SOCKET_EN 1.1
PP1V1_SLPDDR 1.1
PP1V2_AWAKE
PPVDD_CPU_AWAKE 0.75
PMU_SYS_ALIVE 1.78
PMU_ACTIVE_READY 1.78
PMU_COLD_RESET_L 1.79
PMU_PVDDMAIN_EN 3.38
P3V3MAIN_PGOOD 3.25
PP3V_G3H_RTC 3.00
PMU_CLK3K_PCH (unkown)
PCH_RTC_RESET_L 3.00
P5VG3S_EN 3.38
PP5V_G3S 5.15
P3V3G3S_EN 1.8
PP3V3_G3S 3.38
P1V8G3S_EN 1.8
PP1V8_G3S 1.8
P5VG3S_PGOOD 1.78
PMU_CLK (unkown)
Any help is appreciated!
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