Re: 820-00165-02 missing PP3V3_S4SW_SNS rail
U8080 and U7600 both have enables from U8180. Since U8180´s output is 5V on both P5V_S0_EN (U8080) and P1VP5S0_EN (U7600) this might be why they get hot? U8180 being a logic gate should just output the 3,3 V from PP3V3_S5 right? However the board seems to be in S0 state since all S0 rails are present and stable except PPVCC_S0_CPU. Not sure how to proceed....
cj_002
New Member
Last Activity: 07-21-2018, 06:29 AM
Joined: 07-10-2018
Location: Uppsala
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Re: 820-00165-02 missing PP3V3_S4SW_SNS rail
Hi,
Thanks for your input! On U8180 i have:
Pin 1&2: 3 V
Pin 5: 3.3 V
Pin 4: 5 V (is this to high?)
I also checked the resistors and caps you asked for: C8186= 4.98 V however I'm missing R8180, C8185 and C8187, it seems as if they were never placed on the board ill attach image:...Leave a comment:
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Re: 820-00165-02 missing PP3V3_S4SW_SNS rail
Unfortunately i don' t have this tools for that at the moment. However I just noticed that U7600 and U8080 gets really hot to the touch when i plug in charger, but i cant see how this could impact the 1.05 V rails as they come from the PP3v3_S4SW_SNS rail right?Leave a comment:
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Re: 820-00165-02 missing PP3V3_S4SW_SNS rail
Also Vcore=0 VLeave a comment:
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Re: 820-00165-02 missing PP3V3_S4SW_SNS rail
Thank for your reply!
Cant see much corrosion anywhere.
Resistance: SMC_SENSOR_PWR_EN to ground = 600 ohms.
Voltage U1950:
pin1: 0,1 V
Pin2: 3,3 V
Pin3: 0 V
Pin5: 0 V
Pin6: 0 V
Pin7: 0 V
pin8: 3.42 VLeave a comment:
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820-00165-02 missing PP3V3_S4SW_SNS rail
Hey there,
Prologue:
I'm 4 days into component level repairs, still on my fist board an 820-00165-02 (coffee damage), no severe corrosion anywhere. I have (to the best of my knowledge) many of the "basic" rails present (see list below). However I'm failing at PP3V3_S4SW_SNS which is just showing 0,2 V (No short in diode-mode unplugged). According to schematics for 820-00165-[B]A[/B] PP3V3_S4SW_SNS comes from U8050, however i´m missing the enable SMC_SENSOR_PWR_EN (no short in diode-mode unplugged).
Question(s):
1. As I'm following... -
Re: New Members - please post your introductions here
Oh, I see all before me have posted such nice presentations so i must as well i guess. I´m new to the topic of component level repair but i really feel this might be for me. I live in Sweden, 29 years old, PhD student researching on additive manufacturing of Ni-based super alloys.Leave a comment:
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Re: New Members - please post your introductions here
Thanks for the welcome!
/cj_002Leave a comment:
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