Troubleshooting - Casio SF-7900E Service Manual & Parts List

TROUBLESHOOTING

Before the following solutions will be done, save data if possible.
SYMPTOM
No power
No display at all or wrong
display
No key input at all
CAUSE
Battery shortage
Poor soldering of the power supply
circuit
Defective LSI-1 or LSI-2
Defective TAB LSI
Defective heat seal
Defective LCD
Poor soldering LSI-1 or LSI-2
Defective LSI-1 or LSI-2
— 21 —
SOLUTION
Replace batteries
Resolder
Replace it
Replace it
Replace it
Replace it
Resolder
Replace it