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820-02536 - No Trackpad

J

jamiehorn1

Member
Machine came in originally with no keyboard and no trackpad after liquid spill.

Using known good Topcase and trackpad, same issue.

I found a level shift that was not outputting 3.3v and after changing keyboard works but trackpad still doesn’t.

Unsure what to check next as everything is checking out, driving me crazy lol.

Voltages:
LT20x - all OK
LT400 - 12.00v
LT403/02 - all OK
IPD_PWR_EN_GATE - 1.8v
PP3V3_S2SW_IPD - 3.3v
PP5V_S2SW_IPD - 5.2v
PPBUS_AONSW_TPAD - 12v
PP1V8_S2SW - 1.8v
IPD_OCP_FLT - 0v

UT350 SPI_IPD_TOUCH_CS_CONN_L - 3.3v - should this be low?

UT340 IPD_MCU_INT_L - 1.25v - should this be low?

UT3A0 TPAD_KBD_WAKE_L - 1.8v - should this be low?

UT370 IPD_TOUCH_INT_L - 0v

UT390 missing on my board - no stuff?

UT320 IPD_SYS_AWAKE_CONN - 3.3v

UT330 IPD_MTP_FUNC_1_CONN - 3.3v

UT380 IPD_MCU & IPD_TOUCH - both 3.3v - should they be low?
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
Which area has been affected by liquid?

For the level shifters from page 86, you should give the same logic level on output as input.
Just differ the voltage; you may have 3.3V as input and 1.8V, or 1.25V as output.
 
2informaticos

2informaticos

Administrator
Staff member
"_L" marked signals mean active low.
Depending of what signal is, you must interpret if its actual state is High (disabled), or Low (enabled).
 
J

jamiehorn1

Member
Ah ok thanks so a lot of the trackpad signals I mentioned originally are high and therefore disabled. I will change UT350 due to the heat coming off it and then report back. Should have a working donor in next few days to compare
 
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