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820-02020 fan, ambient light sensor, touch bar diagnostics error

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Donlan78

Member
have 2020 m1 13" works great, but fan runs full blast, with fan disconnected MacBook seems to work perfect, I ran apple diagnostics, which reports issue with fan, ambient light sensor, and touchpad, all 3 work but system is detecting issue and causing fan to go full blast, there is no liquid damage, fan connector is clean,
error codes PPF003,PPF004(FAN) ALS001(LIGHT SENSOR DFR001(TOUCHBAR) any suggestions?
 
2informaticos

2informaticos

Administrator
Staff member
No liquid, but some history fault may have.

Did you try disconnecting camera flex from T-CON?
Also try known good trackpad board and flex.
 
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Donlan78

Member
sorry, there was some corrosion around uc300, very minor, cleaned up components and reflowed, nothing that stands out , original keyboard wasn't working , but it works fine now, possible bad connection someone had removed logic board previous to me getting, manifest says fan was replaced
 
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Donlan78

Member
the area looks clean for ud120,140,200,201, I'm not seeing a short on any of the surrounding resistors, i don't have another m1 her to compare can you tell me what to look for, sorry I'm not very good at troubleshooting,
 
2informaticos

2informaticos

Administrator
Staff member
Having more than one sensor error, the problem is not a particular sensor.
One interface blocks the common bus used by these sensors.

Be sure trackpad flex/board both good.
Be aware of new chinese flex, try more than one.
Touchbar itself, or its connector may be faulty.

Inspect for knocked off components, or broken trace.
 
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