820-2532 - A green light but wont turn on

[menatwork]

1. PPBUS_G3H - Yes
2. PP3V42_G3H - Yes
3. PP5V_S3 - no
4. PP5V_S0 - no

External 5V - works

I have no 5v on the board.
Where I start to measure?

Thank you

 

[D_R]

I'd start digging around U7201 / TPS51125

 

[aprendiz]

Do you have PP3V3_S5_REG? If it is there, check if you have a working keyboard or use power pads on the board

 

[larossmann]

Ignore U7201/TPS51125 and do not touch it.

PP1V05_S5_MCP is measuring what voltage? 0.316v, or 1.05v? Ifit is 1.05v, does it drop when you try to turn it on?

 

[menatwork]

Thank you guys, I will try do that.

 

[menatwork]

Louis, i have on PP1V05_S5_MCP 1.17v

 

[menatwork]

PP1V05_S5_MCP 1.17v

 

[larossmann]

PM_SLP_S4_L going up when you hit the power button?

 

[dukefawks]

My first question would be if PP3V3_S5 from TPS51125 is present.

 

[menatwork]

Yes, PP3V3_S5 is present, Duke.

 

[menatwork]

No, I don't get nothing.

 

[menatwork]

Yes, PP3V3_S5 is present, Duke.

 

[larossmann]

When you hit the power button does pm_pwrbtn_l change?

 

[dukefawks]

Also important on 15" models is that you use a known good 85W charger. Check on a working macbook if it really is recognized as 85W and not a Chinese fake one!

 

[menatwork]

Nothing, Louis.

 

[menatwork]

Yes, the charge is 85W (original)

 

[Crizz]

I got the same board with same symptoms here, no liquid damage:

PP5V_S3 - no
PP5V_S0 - no
PP3V3_S5 - present
PP1V05_S5_MCP - 1.16v
pm_slp_s4_l - missing
no shorts to GND

what could it be?
Maybe a clock issue?

 

[dukefawks]

Please no thread hijacking, first want to solve the OP problem.
Is SMC_ADAPTER_EN high?

 

[Crizz]

So if you put 5V with your external power supply it works??

 

[menatwork]

Yes, works!