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Thank you Duke. It has continuous regular pulses on SMC_FAN_0_TACH. Diode mode to ground on SMC_FAN_O_CTL is 0.550v

Thank you duke. Diode mode to ground for SMC_FAN_0_TACH (R5665 pin 1) 0.56v Voltage on SMC_FAN_0_TACH when turned on is 3.146v (both at probe point near SMC and on R5665 pin 1) I replaced R5565, R5660 and R5661 again checked continuity round this area, no change. Thanks for any help you...

Clean machine, no signs of liquid, boots up does not feel "jerky" when booting From the moment the power button is pressed the fan runs 100%. Tried Known good Battery, SSD, DC in, Dc in flex, Track pad, track pad flex and two different fans. EFI Asd tells me : "Motor is running slower than it...

Chinese charger gets green light and machine boots. Still nothing with original 85w - worth pursuing or just supplying chinese charger ?

Q6910 pin 5/6 2.36v pin 4 0.7v pin 1/2/3 0.657v these were in the above post.

Thanks Duke, Yes R6920 was initially burnt and was replaced. q6910 pin 5/6 2.36v pin 4 0.7v pin 1/2/3 0.657v replaced q6910 again in case donor board duff - no change. R6910 99k r6911 10.1k r6912 68k all measure within spec. replaced c6912 R6910 R6911 no change I concur that Q6910 is...

Thank you duke. d6905 pin1 0.68v pin2 0v (no battery connected) pin3 0.67v d6990 pin1 0.007 pin2 0.007 pin3 0.003 pin4 0.004 pin5 0 pin6 0.635 pin7 0.044 pin8 0.635 The probe point next to C6991 looks bad so i ran a wire from D6905 to C6991 and C6992 but this didn't change anything...

820-3462 No green light. Light liquid damage. to pp3v42 area R6920 + R6905 burnt. Replaced these. PP18V5_DCIN_CONN 2.3v PPVIN_G3H_P3V42G3H 1.1v pp3v42 = 0.008v Replaced: C6992 C6991 C69901 R6995 R6996 C6994 q6910 c6995 c6999 u6990 u6900 PPVIN_G3H_P3V42G3H diode mode to ground0.35v...

Thank you Duke. It was pin 7 of J6600 - showing diode mode of 0.2v vs 1.7 on a good board. Removed C6604, DZZ602 & L6607 - still had a short at pin 1 of L6607 - which went direct to U6201. A quick reflow of U6201 solved the problem. Thank you again, may mark as closed.

Hi There, i tried removing both (L6607 / L6608) - this set it to headphone mode in software. I then tried each individually but neither allowed the internal speaker option to show up. I then replaced the headphone jack but no change. Any further thoughts ?

Had a 820-4924 with bad liquid damage, Replaced a lot of things (whole U7100 area etc) Now all working except that the speakers are not seen in software. Machine chimes on start but only gives me Digital Audio out as an option in software (if insert headphones audio plays through them). No...

Thank you Duke. Yes Vcore is also pulsing. J6100 was removed already. Board was clean apart from the damage trace and R6120 / R6121. I replaced area and ran a jumper wire. I've checked for continuity between all the termination resistors to the right of U6100 and the relevant pins. U1950...

820-3435 pp3v42 present green light damage to R6120/6121 ran wire and replaced. ppbus 8.58v PPBUS_S5_HS_COMPUTING_ISNS 8.58 PPBUS_S5_HS_OTHER_ISNS 8.58 PPVRTC_G3H 3.3v PP5V_S5 5.01v PP3V3_S5 3.28v PP3V3_SUS 3.3v SMC_PM_G2_EN 3.4v SMC_LID 3.4v PP3V3_S4 jumping high then low. PP5V_S4RS3...

yes i do (not used very often). No pulsing at all on PM_SLP_S4_L or PM_SLP_S5_L

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

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...

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...

Thank you Duke. Q7550 pin 4 was part of the problem (burnt underneath) - short follows back through Q7551 pins 1/2 - removed Q7551. Short still present on pads 7/8 - assuming CPU is very dead

Not liquid damaged (or very well cleaned) Green light and pp3v42 present. PPBUS_G3H - 1.7v with 0v volts to ground in diode mode Removed fuses F7040 / 7041 short is on PIN2 Pin 1 with fuses removed is 12.56v so generation is working Injected some voltage into pin2 got to 4.5v @ 8amp CPU...

I tried it with an external display with mirroring turned on. When waking from sleep no image on internal or external. Unit does wake up (S3 > S0) as i can turn the volume up / down and get a sound response / resume a youtube video (sound only comes through).