[SOLVED]820-3115 Ts0P failure.

[jgraffis]

i got this 820-3115. The fans come on high after about 5 seconds. ran ASD EFI and it fails for Ts0P. the reading is showing -124c.

i understand that this sensor is in the trackpad ribbon. I changed with known good trackpad and cable, but still the same issue. thought i would check j5800 for short to ground, everything came back just fine except pin 18( pp5v_s5_cumulus) it showed .0L on the multi meter.

not sure where to go on this one, can't seem to find anything in the schematic about Ts0P. any ideas?

 

[arghhh]

Voltage on pin 2 of R5806? Trackpad must be plugged in.

 

[jgraffis]

pin 2 of r5806 18.49v trackpad plugged in.

 

[aprendiz]

Unplug webcam and try again.....

 

[jgraffis]

i unplugged everything except keyboard, trackpad, and lcd connector. Same issue.

 

[dukefawks]

What is the exact error in ASD?

 

[jgraffis]

took pictures of both the fail in asd efi and hardware profile.

 

[dukefawks]

IO failed so data line issue. Check everything connected to SMBUS_SMC_2. Corrosion in iSight connector is a common issue. Check data lines in diode mode.

 

[jgraffis]

thanks man i appreciated the help. is there something i missed in the readings, or is it just an experience thing?

 

[larossmann]

sensor reading below or above limit is usually a bad trackpad because the sensor is reading an off value. can't read the sensor means the sensor is not at fault, but the dataline itself. the trackpad sensor dataline shares a path with the isight light detector thingie which plugs into the webcam connector. If it is being interfered with, or shorted to ground, you can tell by checking diode mode to ground number on that line itself. Typically unplugging bad webcam cable solves this problem but in rare case it is the webcam connector itself - also drove me nuts on a 3437 where I couldn't see any corrosion from the outside, even with a microscope.

 

[jgraffis]

Good to know, and thanks a ton. i didn't notice any corrosion but i will do as instructed. I think these 820-3115 boards are gonna kill me. I've got a couple that do strange things and just have got to them yet.

 

[jgraffis]

Ok we can mark this as SOLVED. it was in fact and issue with pin5 on of j3502 being smashed over right in the bend of the leg. Never seen this on the web cam connector before, i've seen it on the lcd connector due to the lock.

Thanks again duke fawks and louis rossmann. SOLVED.