I've got an interesting fault that I could do with some help on.
I've got a HAC-CPU-20 motherboard that was received broken and it looks like someone had worked on it before. I've tried the usual chip swaps (M92, BQ and PUSB) and I've also swapped the fuel guage to no effect.
The symptoms are as follows:
Plugging a good battery (99-100% charge) and then plugging in the Nintendo charger via a volt/amp monitor I get the charge symbol come up on the screen. The unit doesn't boot after that and sits with a black screen with 15v/0.09a on the charger.
When I plug in the charger I never get the 0.3a - off - 1.5a for fast charging. I know the battery is nearly full so I know I won't get the full amperage going to the battery but I don't get the 3 part routine you usually see on a good motherboard.
With the battery and Nintendo charger connected I can hold down the power button for 20 seconds (until the amps drops on the meter) and if I press the power button again it will boot to the Nintendo logo and then sit with a black screen (no backlight) and have 15v/0.9a on the meter. I can get the same results with just the battery connected.
I did a reflow on the EMMC to no noticable effect. I've removed the crystal near the PMIC to no effect. I've removed the P3USB chip and tried booting to no effect. I've also swapped the M92 and BQ chips to no effect. If I turn the charger 180 degrees I see the voltage on CC1 and CC2 swap over.
I can get it into RCM and is detected by TegraRCMGUI but if I upload fusee-test it doesn't pass the test as it looks like the switch is patched so I can't confirm if the OS is corrupt or not.
Below are the voltages seen with the battery connected and the Nintendo charger plugged in:
I've got a HAC-CPU-20 motherboard that was received broken and it looks like someone had worked on it before. I've tried the usual chip swaps (M92, BQ and PUSB) and I've also swapped the fuel guage to no effect.
The symptoms are as follows:
Plugging a good battery (99-100% charge) and then plugging in the Nintendo charger via a volt/amp monitor I get the charge symbol come up on the screen. The unit doesn't boot after that and sits with a black screen with 15v/0.09a on the charger.
When I plug in the charger I never get the 0.3a - off - 1.5a for fast charging. I know the battery is nearly full so I know I won't get the full amperage going to the battery but I don't get the 3 part routine you usually see on a good motherboard.
With the battery and Nintendo charger connected I can hold down the power button for 20 seconds (until the amps drops on the meter) and if I press the power button again it will boot to the Nintendo logo and then sit with a black screen (no backlight) and have 15v/0.9a on the meter. I can get the same results with just the battery connected.
I did a reflow on the EMMC to no noticable effect. I've removed the crystal near the PMIC to no effect. I've removed the P3USB chip and tried booting to no effect. I've also swapped the M92 and BQ chips to no effect. If I turn the charger 180 degrees I see the voltage on CC1 and CC2 swap over.
I can get it into RCM and is detected by TegraRCMGUI but if I upload fusee-test it doesn't pass the test as it looks like the switch is patched so I can't confirm if the OS is corrupt or not.
Below are the voltages seen with the battery connected and the Nintendo charger plugged in:
