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SAMSUNG Proprietary-Contents may change without notice
6-3
Troubleshooting
6-1-3 Abnormal Backlight Operation
Press and button on the phone
‘H’ level output from
U104 pin 7L?
‘H’ level input from
U104 pin7L drive U209?
The voltage applied to
LCD(U207) pins31?
Backlight
LED on
Check Q206, L202
and its neighboring circuits.
Check U209 and its
neighboring circuits.
Replace if required
Check U104 pin7L.
Replace if required.
Yes
No
Yes
No
Yes
No
Summary of Contents for SCH 620
Page 75: ...9 Block Diagrams SAMSUNG Proprietary Contents may change without notice 9 1 9 1 Main Diagram ...
Page 77: ...SAMSUNG Proprietary Contents may change without notice 9 3 MEMO MEMO ...
Page 79: ...PCB diagrams Samsung Electronics 10 2 10 2 Main PCB Bottom Diagram ...
Page 80: ...PCB diagrams Samsung Electronics 10 3 10 3 CLC PCB Top Diagram 10 4 CLC PCB Bottom Diagram ...
Page 81: ...PCB diagrams Samsung Electronics 10 4 10 5 Hands free Kit PCB Top Diagram ...
Page 84: ...Samsung Electronics 11 3 Circuit diagrams 11 3 CLC Circuit Diagram ...
Page 85: ... Samsung Electronics Co Ltd APRIL 2000 Printed in Korea Code No GH68 00669A BASIC ELECTRONICS ...