Hi everyone,
I hoping that someone could help me with this motherboard. It's had no liquid damage and just one day stopped working.
I currently have it setup on my bench using the power supply with 19v connected to PJP101 but it's showing 0A. I've checked for a short to ground on all the rails but apart from PLV3 & PLV2 nothing else shows. PLV2 & PLV3 are both showing 1.21ohms, so i removed them and now on pin 1 i get 300k on pin 2 it's still 1.2ohms.(Is this a short to ground on NVVDD1?) This still didn't solve the problem of why i'm not getting any amps into the board. It still shows 19v 0A.
I turned my attention to the 2 MOSFETS (PQB3 & PQB4) and charging controller (PUB1). At PQB3 i have 19v on Pin5 but nothing on 1-4. On the PUB1 i have 19v on PIN28 and 0v on both pin4 and 6 (ACDRV & ACDET).
I'm presuming, but could be wrong, that i need ACDET voltage to get some of the others, so i started to investigate that rail.
PRB38 has ~19v both side but PRB11 only has ~19v on pin1 0v pin2. PQB11 has 19v on pin 2 but 0v on pin1. So i'm not sure what is going on here. I also checked for a short to ground and it's fine 0.56 in diode mode.
I've check PRB7 and have 0v both sides, PCB1 has 19v on pin1 but 0v on pin2. I tried removing PQB1 to see if i would get 19v on pin 2 but nothing. Again no short to ground on this rail.
I've tried replacing PUB1, PQB3 and PQB4 just in case one of them was faulty but this hasn't made any difference.
I'm now stuck and not sure what else to try and to why at my bench power supply is showing 19v 0a. Is this correct? Why no other power rails are active at the charging controller. (ACDRV & ACDET)
Hopefully some experts on here can help me to get thisworking again or at least find the actual problem. I know at this stage that it might never work due to maybe a problem with the NVVDD1 rail.
I hoping that someone could help me with this motherboard. It's had no liquid damage and just one day stopped working.
I currently have it setup on my bench using the power supply with 19v connected to PJP101 but it's showing 0A. I've checked for a short to ground on all the rails but apart from PLV3 & PLV2 nothing else shows. PLV2 & PLV3 are both showing 1.21ohms, so i removed them and now on pin 1 i get 300k on pin 2 it's still 1.2ohms.(Is this a short to ground on NVVDD1?) This still didn't solve the problem of why i'm not getting any amps into the board. It still shows 19v 0A.
I turned my attention to the 2 MOSFETS (PQB3 & PQB4) and charging controller (PUB1). At PQB3 i have 19v on Pin5 but nothing on 1-4. On the PUB1 i have 19v on PIN28 and 0v on both pin4 and 6 (ACDRV & ACDET).
I'm presuming, but could be wrong, that i need ACDET voltage to get some of the others, so i started to investigate that rail.
PRB38 has ~19v both side but PRB11 only has ~19v on pin1 0v pin2. PQB11 has 19v on pin 2 but 0v on pin1. So i'm not sure what is going on here. I also checked for a short to ground and it's fine 0.56 in diode mode.
I've check PRB7 and have 0v both sides, PCB1 has 19v on pin1 but 0v on pin2. I tried removing PQB1 to see if i would get 19v on pin 2 but nothing. Again no short to ground on this rail.
I've tried replacing PUB1, PQB3 and PQB4 just in case one of them was faulty but this hasn't made any difference.
I'm now stuck and not sure what else to try and to why at my bench power supply is showing 19v 0a. Is this correct? Why no other power rails are active at the charging controller. (ACDRV & ACDET)
Hopefully some experts on here can help me to get thisworking again or at least find the actual problem. I know at this stage that it might never work due to maybe a problem with the NVVDD1 rail.
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