Hello,
I am currently working on the Lenovo ThinkPad E14 Gen 2 with a GE4B0 motherboard.
Issue: The laptop runs on battery power, but it fails to recognize the charger. The LED1 indicator does not illuminate in white or orange when the charger is connected.
My investigation:
1. LB4709 and LB4708 both register 20V.
2. UE1:
Pin 34 ACIN_LED measures 0V at R31.
Pin 11 VCC_LPC_ESPI registers 0.27V.
3. +3VL_EC at R42532 and various other locations, following the schematics, measures 1.7V.
Charging IC: BQ25710
Measurements without battery connected only charger.
The Boardview and Schematics are attached. But from very similar boards.
MOD Edit - Link to Schematic https://www.badcaps.net/forum/showth...hlight=NM-D011
Reminder: rules and organization of this section https://www.badcaps.net/forum/showthread.php?t=117483
.
I am currently working on the Lenovo ThinkPad E14 Gen 2 with a GE4B0 motherboard.
Issue: The laptop runs on battery power, but it fails to recognize the charger. The LED1 indicator does not illuminate in white or orange when the charger is connected.
My investigation:
1. LB4709 and LB4708 both register 20V.
2. UE1:
Pin 34 ACIN_LED measures 0V at R31.
Pin 11 VCC_LPC_ESPI registers 0.27V.
3. +3VL_EC at R42532 and various other locations, following the schematics, measures 1.7V.
Charging IC: BQ25710
Measurements without battery connected only charger.
The Boardview and Schematics are attached. But from very similar boards.
MOD Edit - Link to Schematic https://www.badcaps.net/forum/showth...hlight=NM-D011
Reminder: rules and organization of this section https://www.badcaps.net/forum/showthread.php?t=117483
.
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