Samsung SM-G975F Service Manual page 105

8. Level 3 Repair
8-4-16. Display
LCD is still off after PWR ON
Check the connection of
VDD_DDI_3P0 = 3.0V (C12027)
VDD_DDI_1P8 = 1.8V (C12028)
VDD_DDR_1P6 = 1.6V (C12037)
ELVDD_4P6 = 4.6V (C12039)
ELVSS_-4P4 = - 5.4 ~ - 1.4V (C12029)
ELAVDD_7P6 = 7.6V (C12036)
Replace the Display module
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Yes
No
HEA12000
Yes
No
Check
Yes
No
Check
Yes
No
Yes
No
END
No
Reconnect the HEA12000
No
Resolder or Replace the U12000
No
Resolder or Replace the U12000