820-00426 restarts when trackpad is connected

[huzeafa]

hello guys , I have this machine that would wouldn't b.oot dot desktop only when I connect the trackpad, but with the trackpad disconnected , it boots okay . I have measured for a short to ground on J4801 but I could not find any , I also tried to boot the machine through safe mode , but still unable to . I have replaced a whole functional top casing that includes the trackpad and cable but no changes

 

[2informaticos]

Try desoldering F4809.
If still the same, try removing L4803.

 

[huzeafa]

With L4803 removed, the machine boots okay , but trackpad is not working since there's no power going to it

 

[2informaticos]

Resolder L4803 and post diode mode to ground w/ and w/o trackpad connected.
Inspect J4801 pins for corrosion.

Also connect trackpad and try disconnecting keyboard only.
Check if SMC_TPAD_RST_L is always high.

 

[huzeafa]

OK

 

[huzeafa]

Thank you for your time and apologies for dragging you over my mistakes . The issue was the charger I was using , the charger is an after market charger , while the battery for the client is completely bad . So the machine is unable to solely operate on the charger power only . its been resolved now