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820-00165 Board fan spin, but no image

N

Neil250

Member
Originally, short on PP3V42_G3H with corrosion on C5002, C5007 and C5008

These were replaced.
Short gone.
Green light on charger, fan spin. No image.
PRAM reset. Nochange.

PPBUS_G3H: 8.58V

L7310: 1.80
L7320: 1.80V

L7430: 1.20
L7560: 3.36

L7520: 5.16
L7130: 8.58

L3095:
PIN1: 0V
PIN2: 0V

C3080:
1: 8.58
2: 8.19

R3080: 465 Ohms

L7701:
1:0V
No short by ohm mesurement on L7701

F7700 Fuse is good

Q7706
4:8.58
3: 8.32
1: 0V and no short

Q7707

EDP_BKLT_EN: 0V
BKLT_PLT_RST_L: 3.2V

Replace U7701?. NO change

USB port lights up a USB hub.
 
Last edited:
N

Neil250

Member
3.35V on PLT_RESET_L
U1950 looks good

looking at Q3080:
PIN 4: 8.57
PIN 1: 8.19

PIN 2: 0V

PP5V_s5: 5.15
PP3V3_S4: 3.35
PP3V3_S3: 3.36
pp3V3_s0: 0V
PP5V_S4RS3: 5.15
PP3V3_s5: 3.35
PP3V3_SUS: 3.35
PP3V3_S4SW: 3.35
 
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2informaticos

2informaticos

Administrator
Staff member
Do you get USB actibvity?
Check it properly, not only for 5V on USB port.
Caps Lock reacts?

Try known good BIOS, just in case.
 
N

Neil250

Member
cpu is warm
how do i check the usb.
I plugged in a mouse, it does not light up and stay on but it does briefly flash when plugged in.
 
2informaticos

2informaticos

Administrator
Staff member

HOW TO collection

I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...
boards.rossmanngroup.com boards.rossmanngroup.com
 
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