Trouble Shooting; Baseband Part Troubleshooting - LG MG810c Service Manual

4. TROUBLE SHOOTING

4.1 Baseband Part Troubleshooting

A. Power-On Trouble Troubleshooting
• 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 plus)
- 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
4. TROUBLE SHOOTING
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