Samsung YP-Q1 Service Manual page 24

4-1-5 Cannot Recharge
Symptom Cannot recharge the BATTERY
1 Check external input voltage: DC 5V (D300)
2 Check #FULL_CHG PIN (IC300 15PIN)
Major Checklist
3 Check #CHARGE_STOP PIN (IC300 12PIN): HIGH → STOP, LOW → CHARGING
Cannot Recharge
Does it work when
the power adapter is
connected?
Yes
(after disassembling
the unit) Is the Battery connector
connected properly?
Yes
Check power at the BATTERY
(single part).
Yes
Check external input
1
voltage: DC 5V (D300)
Yes
Check
2
#FULL_CHG PIN
(IC300 15PIN): HIGH → CHARGING,
LOW → FULL_CHARGING
Yes
Check
3
#CHARGE_STOP PIN
(IC300 12PIN): HIGH → CHARGING,
LOW → STOP
Yes
Completion
Samsung Electronics
: HIGH → FULL_CHARGING, LOW → CHARGING
No
No
No
No
 Refer to wave pattern
image of Fig. 4-5.
No
 Refer to wave pattern
image of Fig. 4-5.
No
 Refer to wave pattern
image of Fig. 4-5.
Does it work
after upgrading to the
latest firmware?
Yes
Disassemble the unit and check if
Battery connector is defective.
Recheck after replacing the
BATTERY.
Troubleshooting
No
Replace the BOARD
(needs thorough examination).
4-11