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8-3-8. Touch Key(Back, Search) Part
Touch Keys do not work
Check touch key connector
Is the touch key working?
Check VTKEY_3.3V = 3.3V?
Check VTKEY_2.6V = 2.6V?
Yes
Yes
Yes
(TP: C468)
Yes
(TP: C429)
Yes
END
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No
Reconnect the touch key module
No
Change the touch key module
No
Re-solder U407
Check TOUCHKEY_EN = 2.
(TP: U407 Pin 3)
No
8-19
Level 3 Repair
(HEA701)
Yes
6V?
No
Change PBA
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