Sharp GX20 Service Manual - Page 60
LED401, LED402 or Q403 defective.
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GX20 H (From page 2-53) CONFIDENTIAL Is the external display back light set to ON? YES Voltage of 3 V applied to Q403 gate (G) terminal? YES LED401, LED402 or Q403 defective. NO ON Setting by the following menu. Settings → Phone settings → External display → Back light NO Does the back light turn on? YES Nondefective. NO Defective connection between IC104 112 pin and Q403 gate (G) or IC104 defective. 2 - 54
GX20
2 – 54
CONFIDENTIAL
(From page 2-53)
Is the external display back light set to ON?
ON Setting by the following menu.
Settings
→
Phone settings
→
External display
→
Back light
Does the back light turn on?
Nondefective.
Voltage of 3 V applied to Q403 gate (G) terminal?
Defective connection between IC104 112 pin and Q403 gate
(G) or IC104 defective.
LED401, LED402 or Q403 defective.
H
NO
YES
NO
YES
NO
YES