Troubleshooting; Checkpoints By Error Mode - Samsung YP-P2 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. (2.5V ~ 3.1V)
Major Checklist
3 Check if the ENABLE pin signal of the DDCON IC is 'HIGH'. (2.5V ~ 3.1V)
4 Check power.
Caution
Be careful not to short anything out when checking the power line.
After insert battery to PCB,
Please TEST
Samsung Electronics
2V/div
1m/div
(L300: 2.8V(MAIN), L301: 1.07V(CORE), L302: 1.8V(MEMORY), L303: 3.1V(LCD))
The power does not turn on.
1
No
Is battery inserted to Main PCB
normally?
Does the power turn on after
recharging the battery?
A
Troubleshooting
Yes
 Refer to wave pattern
image of Table 4-1.
Yes
No
Completion
4-1