A1708 - 820-00840-A Motherboard
Issue: Charger plugged in, attempts to power up. Voltage suck at 20.334V 0.083A. CPU area starts to warm up very slowly, if the FAN is installed, it'll spin and eventually keep increasing the fan spin along with the tiny increase of Amps. No display to external using Type-C to HDMI or internal screen. Both sides of LVDS connectors look good.
Solid inspection done under Microscope and can't see bad tracks or corrosion. I have attempted to flash the BIOS Chip and the result is same. With the battery plugged in, the Amps will increase regularly above 2Amps and charges the battery perfectly fine and will stay on with battery if charger disconnected.
Device does not come up in Apple Configurator software.
Voltage measurements of some rails for your refefence with nothing connected to the motherboard. Just the charger alone without SSD, LCD, battery, daugther board, keyboard, speakers etc.
PP5V_S4 5.1063
PP3V3_S5 3.3115
PPVIN_S0SW_LCDBKLT 0.0160
PP1V_OPC_S0 1.0553
L7030: TBA_PHASE1 voltage is very strange and I have demonstrated using a video here, it could be because there is no battery installed.
VIDEO: https://youtu.be/-CY66aQ45Mk
L7370: PPVCCSA_S0G_R voltage is very strange and I have demonstrated using a video here.
VIDEO: https://youtu.be/f5UzDF6PYzw
PP1V_S5G_REG 1.08V
PPVCCPCH_S5G 1.08V
PPVCCIO_S0G 1.0V
PP1V2_S3_REG 1.24V
V3V3G3H 3.44
Issue: Charger plugged in, attempts to power up. Voltage suck at 20.334V 0.083A. CPU area starts to warm up very slowly, if the FAN is installed, it'll spin and eventually keep increasing the fan spin along with the tiny increase of Amps. No display to external using Type-C to HDMI or internal screen. Both sides of LVDS connectors look good.
Solid inspection done under Microscope and can't see bad tracks or corrosion. I have attempted to flash the BIOS Chip and the result is same. With the battery plugged in, the Amps will increase regularly above 2Amps and charges the battery perfectly fine and will stay on with battery if charger disconnected.
Device does not come up in Apple Configurator software.
Voltage measurements of some rails for your refefence with nothing connected to the motherboard. Just the charger alone without SSD, LCD, battery, daugther board, keyboard, speakers etc.
PP5V_S4 5.1063
PP3V3_S5 3.3115
PPVIN_S0SW_LCDBKLT 0.0160
PP1V_OPC_S0 1.0553
L7030: TBA_PHASE1 voltage is very strange and I have demonstrated using a video here, it could be because there is no battery installed.
VIDEO: https://youtu.be/-CY66aQ45Mk
L7370: PPVCCSA_S0G_R voltage is very strange and I have demonstrated using a video here.
VIDEO: https://youtu.be/f5UzDF6PYzw
PP1V_S5G_REG 1.08V
PPVCCPCH_S5G 1.08V
PPVCCIO_S0G 1.0V
PP1V2_S3_REG 1.24V
V3V3G3H 3.44
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