Troubleshooting; Checkpoints By Error Mode - Samsung YP-T10 Service Manual

4. Troubleshooting

4-1 Checkpoints by Error Mode
Oscilloscope Setting Values
Voltage/DIV
TIME/DIV
4-1-1 No Power
Symptom
Power does not turn on.
1 Check the power terminal connection (battery, adapter).
2 Check if the key signal is 'HIGH' when the POWER key is pressed. (More than 2.5V)
Major Checklist
3 Check if the ENABLE pin signal of the DDCON IC is 'HIGH'. (More than 2.5V)
4 Check power. (L300: 1.08V(CORE), L301: 3.0V(MAIN), L302: 1.8V(MEMORY))
Caution Be careful not to short anything out when checking the power line.
After insert battery to PCB,
Please TEST
Samsung Electronics
1V/div
10ms/div
The power does not turn on.
No
Is battery inserted to Main PCB
normally?
Does the power turn on after
recharging the battery?
A
Troubleshooting
Yes
Yes
No
Completion
4-1