Samsung SM-A507FN Service Manual page 92

8. Level 3 Repair
8-4-16. Display
LCD is still off after PWR ON
Replace the Display con-to-con FPCB
Check the connection of
HDC7004
Check
VDD_LCD_3P0 = 3.0V (C7048)
VDD_LCD_1P8 = 1.8V (C7049)
Check
ELVDD 4P6 = 4.6V (C7066)
ELVSS_-4P4 = - 4.4 ~ - 1.4V (C7074)
ELAVDD_7P3 = 7.6V (C7056)
Replace the Display module
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END
No
Reconnect the HDC7004
No
Resolder or Replace the U7005(3.0V)
Resolder or Replace the U7006(1.8V)
No
Resolder or Replace the U7000