Power-On Trouble; Charging Trouble - LG T5100 Service Manual

3. BASEBAND PART TROUBLE SHOOTING

3.4 Power-On Trouble

Power-On Sequence
- Connecting Battery
- Power-On Key Detection
- PWON signal goes to ABB and then ABB resets DBB by ONNOFF signal
- ONNOFF turns low(0V) to High(2.8V) and it resets DBB(Calypso)
- All LDOs(internal LDOs of ABB and external LDOs) are turned on
Check Points
- Battery Voltage
- Power-On Key Detection(PWON signal)
- Output of LDOs
Trouble Shooting Setup
- Connect PIF-UNION Jig to the phone
- Set the TI-Remote switch at PIF-UNION Jig off
Trouble Shooting Procedure
- Check Battery Voltage
- END Key Dome switch condition
- Check the output voltage of all LDOs

3.5 Charging Trouble

Charging method : CC-CV
Charger Detection Voltage : over 4.0V
Charging Time : About 2.5Hours
Charging Current : 550mA
Cut-off Current : 50mA
Low Battery Alarm
- Talk mode : 3.62 ± 0.03
- Standby mode : 3.50 ± 0.03
Switch-Off Voltage
Charging Temperature ADC Range
- ~ -20°C : No Charging operation
- -20°C ~ 60°C : Charging
- 60°C ~ : No Charging operation
3.88V 3.87V~3.74V
STB : Standby mode ( When talk mode, the battery icon starts blinking below 3.62V level)
3.74V~3.68V 3.68V~3.62V
Figure 24. Battery Block Icon
- 40 -
Blinking
3.62V~3.5V(STB) 3.5V~3.35V