Samsung Yepp YP-30S, Service Manual

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5. Troubleshooting Guide
Troubleshooting Guide
Samsung Electronics 5-1
Status of Non-conforming
Poor power connection
Poor switch
No back-light ON
Poor display or No display
(forming of stripe, partial dark)
Black screen in display
of FONT and LOGO
Poor USB communication
(perform test sequentially)
Cause
Poor contact of PCB’s
b) terminal
Poor key (SW1 – SW6) contact
Poor LCD contact
Poor LCD
No initialization
Poor initialization work
Poor computer
Poor USB cable
Soldering of USB port
Point of Repair
Replace b) terminal plate.
Replace the relevant switch.
Replace LCD.
Replace LCD.
Execute initialization program.
Execute initialization program.
- Test in comparison with other YP-30S set
- Test in comparison with other computer
- Test in comparison with other USB cable
- Ensure soldering status