Samsung SGH-i200 Service Manual page 40

Flow Chart of Troubleshooting and Circuit Diagrams
10-1-9. LCD
Back light does not work Back light does not work
Is LCD Contrast set on high Is LCD Contrast set on high
Level in the Menu ? Level in the Menu ?
Is HDC601 connector c onnected? Is HDC601 connector c onnected?
12V < V_LED < 13V 12V < V_LED < 13V
back light IC U601 back light IC U601
VLCD_1.8 =1.8V & VLCD_2.8=2.8V VLCD_1.8 =1.8V & VLCD_2.8=2.8V
Control Signal Control Signal
LCD_RS, LCD_CS, LCD WR LCD_RS, LCD_CS, LCD WR
Replace the LCD Module Replace the LCD Module
YES YES
YES YES
YES YES
YES YES
U600 U600
YES YES
F600 F600
YES YES
END END
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NO NO
Set LCD Contrast on high level Set LCD Contrast on high level
NO NO
Check the HDC601 connector Check the HDC601 connector
NO NO
Check the U601 & relation circuit Check the U601 & relation circuit
Check the U600 & relation circuit Check the U600 & relation circuit
NO NO
NO NO
Check the UCP700 Check the UCP700
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