Samsung GT-S8500 Service Manual page 49

8-3-11. TSP
"Touch Screen" does not work
connector on Main PBA
Check the TSP connector
U400 Pin 6 = 2.8V and Pin 8 =
Replace the OCTA module
1
TSP_LDO_ON
2
3
4
Yes
Check the OCTA
Yes
on OCTA Module
Yes
3.3V
Yes
END
TSP_VDD_2.8V
V_BAT
U400
8
CE1 VOUT1
VDD 7
GND
6
CE2 VOUT2
5
NC
NC
9
C409
C410
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Reconnect the OCTA Module
No
Reconnect the TSP Connector
No
Resolder or change U400
No
BH202
TSP_AVDD_3.3V
C411
8-20
Level 3 Repair
V408 V409
R518 R517
F405
HDC400
F404
F403
RESET_OUT
TP600
TP601
PDA_ACTIVE
AP_NANDCS