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Has anyone here ever used a Toneohm 950 by Polar Electronics to locate a short on a macbook/apple board? If so how did it work?

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...

Machine was booting to the desktop originally, login in fine BUT would not charge battery AND WOULD not run on battery alone. Keyboard and trackpad working fine. I decided to change the ISL625 chip. Good news: the battery now appears to charge and machine continues to boot to the desktop...

820-00165 PP5V_S5 is not short to ground in diode mode F7140: 8.60 PPBUS_G3H U7501 4: 0 V 21: 3.38 23: SHORT Changed U7501 with new chip, no change Changed U7400, no change CAPS: C7500 looks good but I removed i and short still there Am I on the right track This short is an issue keeping...

U7701 looks good BKL_EN: 0V, no short to ground on BKL_EN using DIODE MODE: 0.57V F7700 good, voltage same on both sides 1: 8.58 2: 8.58 XW7720 area looks good continuity of switch good between: continuity confirmed between XW7720 pin1 test point and pin 2 of D7701 Q7706 4:8.58V 3:8.33V...

OK I have been away from board repair for 3 months so I think I am have forgotten a lot. No water damage. No green light or fan spin. U7100 1: 0V 2: 14.75 3: 3.94 V 5:1.09 7: .34-.7 8: 1.1-1.38 9: 0.03 12:3.42 13:3.40 14:3.39 15:.06 16:8.18 17:8.20 18:8.20 19:5.04 20:5.03 21:.23 22: 23: 8.20...

No green light, no fan spin. New flex cable tried and no go. U7090 looks terrible. See image below. PP3V42_G3H is 0V needless to say 0V at L7095 Tons of corrosion at U7090. I don't like to just throw a board into a US cleaner but I am considering doing so on this one. I can't even measure...

Machine boot and works fine on external monitor No water damage J83000 looks good F7700 is good (conitinous) BKL_EN at R7731 is 0V Q7706 PIN 4: 8.59V PIN 3: 8.35V Q7707 PIN: 2: 3.33V PIN 5: 0 V XW7720 No continuity between: PPVOUT_SW_LCDBLKT_FB test point and D7701 PIN 2 ??? open switch...

U3540 is severely corroded PP3V3_S5: 3.3V at C3540 but bouncing at pin 1 U3540 Dry scraped away the corrosion, no alcohol, nothing at pin 1 Plugged it back in, boot looping stopped. Damn thing booted right to desktop. U3540 is wifi? I may just replace this (but I don't want to unless I...

Board boots to desktop. I can see the log in screen but there is no backlight. F7700 fuse good, PPVIN_S0SW_LCDBKLT_FET=0v EDP_BKLT_EN=0 BKLT_PLT_RST_L=3.3v No short on Q7707 PIN 5 LED driver?

Board chimes, fan spins no display L8304 black and cracked in half replaced it..still no display now 3.3V for 1-2 seconds measured at pin 2 after power applied R8364 look a little worn so replaced it lvds J8300 connector looks good no water damage usb mouse lights up 1.8V at cpu inductors

No water damage per customer Amber light on charger PPBUS_G3H at 1.94V CPU WARM Obvious;y no fan spin U7100: 1: 0V 2: 14.59 3: 3.94 7: 1.17V 8: .326 9: .1 10: 3.43 12: 3.43 13: 3.40 14: 3.40 15: 0.06 16: 1.95 17: 1.95 18: 1.95 19: 5.01 20: 5.0 23: 1.97 24: 2.57 25: 6.52 26: 14.19 27: 14.41...

Green light on charger/ goes to orange. No fan spin. No liquid damage. PP5V_S0: 4.95V PP3V3_S0: 3.30 V PP1V5_S0: 1.5 V PP0V6_S0_DDRVTT: 0V at pin 1 C2700 U7400 PIN 13 was 0.18V to ground in diode mode but ONLY 336 Ohms in Resistance mode All the other pins (except ground pins of course) were...

Can anyone comment on the quality of aliexpress displays. I don’t think I have the skill to replace the lcd only by taking apart the whole assembly...

I have a fully working Early 2015 820-00165 running MAC OS high Sierra When I boot from my USB installer drive in an attempt to upgrade to Catalina I have noted that the CPU gets hot Fan spinning but this CPU is hot The install does not appear to be hanging but I started to get alarmed at how...

but camera seems to work. what is ndc001? thermal sensor?

This is a stupid question but I have a 820-00165 that boots to the OS but strangely loses the trackpad at the login screen. I was trying to install OS X Catalina on a repaired machine off a USB drive installer that I have used many times. The trackpad works at this point. Its when I get to the...

No green light, no fan spin. PPBUS_G3H: 8.19 V U7100 1: 0V 2: 14.71 3: 3.98 9:0.03 12: 2.76 13: 0 14: 2.65-2.73 15: 0.05 V 17: 8.19 18: 8.15 17-18 RES: 3.4 O 19: 5.10 20: 5.08 27: 14.57 28: 14.57 27-28 RES: 20 O R7180: PIN 1 14.58V No getting PP3V42_G3H so no power to SMC? U7090 6...

No green light, no fan spin. PPBUS_G3H: 8.19 V U7100 1: 0V 2: 14.71 3: 3.98 9:0.03 10: 2.74 11:2.74 12: 2.76 13: 0 14: 2.65-2.73 <--- SMC_BC_ACOK 15: 0.05 V 17: 8.19 18: 8.15 17-18 RES: 3.4 O 19: 5.10 20: 5.08 27: 14.57 28: 14.57 27-28 RES: 20 O R7180: PIN 1 14.58V Change U7100? U7090...

Green light No fan spin No water damage Board just "suddenly would not turn on" PP1V2_S3 = 0 V U7400 with lots of white corrosion L7430: 0.30 V on diode mode to ground PP5V5_S5: 5.5V change U7400?