820-00928 stuck on 5V

[MOMOH]

hello guys , have got 820-00928 that's stuck on 5V. have got PP3V42 including PP3V3_UPC_XB_LDO, my SMC_RESET_L is high , all the i2c lines are high as well , I don't have a short to ground , the machine was not liquid damage . I have the PP1V8_UPC_XA_LDOD , I would like to know what else do I need for me to get 20V output or do I need to replace the whole CD3215? again at what point is it oaky to actually replace the CD3215, what must be present

 

[2informaticos]

First check BUF_SMC_RESET_L.
If OK, compare diode mode readings on power rails of all CD3215 chips.

Any voltage at F7000?
Check diode mode there too...

 

[MOMOH]

BUF_SMC_RESET_L is present at 3.3V , and F7000 is about 0.02V am now checking on the diode measurements

 

[MOMOH]

have got a quick question, is it possible to have a failure on a line that's already has it preset value ? for example , am comparing diode mode to ground on the power rails of the CD3215 even though these where present , so does that mean their presence does not suggest the lines being okay ? please explain to me

 

[2informaticos]

Readings on similar rails of all CD3215 chips must be almost equals.
Even if you get expected voltage, bad reading can be clue for internal problem.

 

[MOMOH]

thank you for the explanation.I compared the diode mode readings to a working board and they match,

 

[2informaticos]

Do you get similar values between all chips of non-working board?
Same I/V behaviour an all USB-C ports?

 

[MOMOH]

same in in all , compared to a working board

 

[2informaticos]

Could be CD3215, or even SMC issue.
Try replacing CD3215 chips one by one; same code termination, of course.

 

[MOMOH]

Okay , let me do that