Samsung SM-T520 Service Manual page 54

8-3-9. LCD
LCD is still off after PWR ON
Check the connection of
DISPLAY_3.3V_LCD=3.3V
VCC_1.8V_AP=1.8V(C542)
VLED_A_21V(C850)
LCD_PWM_IN_1.8V ( R 818)
LCD_PWM_OUT ( R 819)
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Yes
HDC 801
Yes
Check
(C847, C853),
Check
Yes
Check
Yes
Replace LCD
Module
Yes
END
No
Reconnect the HDC801
No
Resolder or Replace the DCDC(U812)
No
Resolder or Replace the PMIC(U500)
No
Resolder or Replace the DCDC(U802)
8-26
Level 3 Repair