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820-3330 - Green light no power missing SUS

M

MUUK

Member
820-3330

LVDS area damage (from end user forcing on a 2011 panel)
Blown BKL fuse.
Green light, no fan spin.
Charges battery, no power on with battery.
CPU cold,

PPBUS_G3H 12.56
PPVIN_S5_HS_COMPUTING_ISNS 12.56
PPVIN_S5_HS_GPU_ISNS 12.56v
PPVIN_S5_HS_OTHER_ISNS 12.56v
PP3V42_G3H 3.416
PPVRTC_G3H 3.279
PP5V_S5 5.01v
PP3V3_S5 3.3

PP5V_S3 0v
PP5V_S5 0v

SMC_ADAPTER_EN = 3.4v
SMC_PM_G2_EN 3.4v
S5_PWRGD 3.386v
SMC_LID 3.386v
SMC_BATLOW_L =3.3v


PM_SLP_S4_L = 0v
PM_SLP_S5_l =0v
PM_SLP_SUS_L 0v
P5VSUS_EN =0

U7940
PIN5 VCC 3.32v
PIN6 0v (PM_SLP_SUS_L)
SMC_BATLOW_L =3.3v

R1923 ( for PM_SLP_SUS_L) 0v

Lost on this one, would you have any suggestions please ?
 
smiba

smiba

New member
Is PP5V_S5 5.01V or 0V? You specify it twice in your post

S5_PWRGD high? PM_DSW_PWRGD high?
 
Last edited:
D

dukefawks

Administrator
Forcing a wrong connector can only really affect power on if 3v3_S0 gets shorted. But if that happened the backlight fuse could never have blown as it needs to boot to do that.
After that it could be anything as it is probably some random component knocked off.
 
M

MUUK

Member
Thanks for your replies, this apparently was at another shop before (joy).

Apologies PP5V_S5 is 5.01v, PP5V_S3 is 0v (copy paste went wrong)

S5_PWRGD = 3.3v
PM_DSW_PWRGD 3.4v


Checking for shorts on S3/S0 rails
PP5V_S3 diode mode 0.395 drop to ground.
PP3V3_S3 0.330 diode mode
PP3V3_S4 0.386 diode mode

PP5V_S0 0.375 diode mode
PP3V3_S0 0.283 diode mode



PP3V3_S4 is 0.54v - significant ?
 
smiba

smiba

New member
PP3V3_S4 is that voltage drop in diode mode or trace voltage?
Resistance to ground in Ohms?

Honestly no idea what this could be, check the board for any ugliness or missing parts. Take your time with this as they're sometimes hard to find
 
Last edited:
M

MUUK

Member
Thank you for the reply.
PP3V3_S4 has trace voltage of 0.54v (unit powered on voltage mode multimeter)
Resistance to ground on PP3V3_S4 measured at U5750 pin 4 is 7Kohm diode mode voltage drop to ground is 0.356v
PP3V3_S4_EN 0v
 
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