820-3115 - No trackpad

kronos23

New member
Working on a 820-3115 with no trackpad. Found that PP18V5_Z2 is missing on the connector, confirmed PP3V3_S4_TPAD is present. Traced it to U5805 and found the following readings.

1 - 0.053
2 - 5.07
3 - 0.000
4 - 0.185
5 - 0.001
6 - 0.000
7 - 0.000
8 - 0.037



So I replaced it but having the same results. Any ideas ?
 

aprendiz

Moderator
PP5V_S5_CUMULUS is present???' If yes, try another trackpad..... Z2_BOOST_EN should be high but it wont if trackpad is not detected...
 

kronos23

New member
On L5800 I have 5V on pin 1 but nothing on pin 2 Based on schematics and board view I should have a filter there however these just look like test points ? Im confused.
 

aprendiz

Moderator
Sorry my mistake, schematic says pin 18 not connected for Z2 Flex, try another trackpad and flex cable.........
 

dukefawks

Administrator
I'd first try a known good trackpad+cable. After that you need to check all connections from the connector to U5701, could be corroded trace.
 
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