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Current version by: Minho ,

Text:

When you have a tough one like this, you have to be systematic in your probing. You don’t say what lines you probed so I’ll assume the “big” ones like CPU/GPU/SOC/SDRAM/NAND etc. You also don’t say what the phone has been through prior to this issue (water, impact) so it difficult to make any specific recommendations.
 
Seeing as how you are not seeing anything obvious such as physical damage, water (?) or any heat signatures, I will suggest however that you check ALL the PMIC lines (the switcher’s and LDO’s) and then if necessary, check the BBPMU outputs as well. I would also check the secondary LDO’s such as MESA, BL, LCM etc. as they can also cause issues with boot by jamming up the I2C lines. Once you are convinced that there are no power issues, you’ll probably have to start pulling major chips until you either figure it out or call it quits :>).
 
EDIT (for funsies - I’ll delete it later!)
 
[image|1716783]

Status:

open

Edit by: Minho ,

Text:

When you have a tough one like this, you have to be systematic in your probing. You don’t say what lines you probed so I’ll assume the “big” ones like CPU/GPU/SOC/SDRAM/NAND etc. You also don’t say what the phone has been through prior to this issue (water, impact) so it difficult to make any specific recommendations.
 
Seeing as how you are not seeing anything obvious such as physical damage, water (?) or any heat signatures, I will suggest however that you check ALL the PMIC lines (the switcher’s and LDO’s) and then if necessary, check the BBPMU outputs as well. I would also check the secondary LDO’s such as MESA, BL, LCM etc. as they can also cause issues with boot by jamming up the I2C lines. Once you are convinced that there are no power issues, you’ll probably have to start pulling major chips until you either figure it out or call it quits :>).
 
EDIT (for funsies - I’ll delete it later!)
 
[image|1716783]

Status:

open

Original post by: Minho ,

Text:

When you have a tough one like this, you have to be systematic in your probing. You don’t say what lines you probed so I’ll assume the “big” ones like CPU/GPU/SOC/SDRAM/NAND etc. You also don’t say what the phone has been through prior to this issue (water, impact) so it difficult to make any specific recommendations.

Seeing as how you are not seeing anything obvious such as physical damage, water (?) or any heat signatures, I will suggest however that you check ALL the PMIC lines (the switcher’s and LDO’s) and then if necessary, check the BBPMU outputs as well. I would also check the secondary LDO’s such as MESA, BL, LCM etc. as they can also cause issues with boot by jamming up the I2C lines. Once you are convinced that there are no power issues, you’ll probably have to start pulling major chips until you either figure it out or call it quits :>).

Status:

open