SAMSUNG Proprietary-Contents may change without notice
Level 3 Repair
8-19
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8-3-8. Touch Key(Back, Search) Part
Touch Keys do not work
Yes
Check touch key connector
Reconnect the touch key module
(HEA701)
No
Yes
Check VTKEY_3.3V = 3.3V?
(TP: C468)
Re-solder U407
No
Is the touch key working?
No
Change the touch key module
Yes
Yes
END
Check TOUCHKEY_EN = 2.
6V?
(TP: U407 Pin 3)
Check VTKEY_2.6V = 2.6V?
(TP: C429)
Yes
Yes
Change PBA
No
No