Search results

Would you recommend using the CMI Zapper "Clean ME region" function in this case? I have backed up the MAC ROM to the CMI Zapper and to a PC (.BIN file). I am reading: https://ghostlyhaks.com/blog/apple-efi/25-clean-me-region but is there another tutorial source and where can I find a clean ME...

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?

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.

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

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...

cleaned pads and resoldered U7100 Machine now boots and charges trackpad works and keyboard works Thanks!

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...

you were correct repeated voltage injection 1.2 v magic smoke C7540 replaced it and board works, short gone Do you US boards to clean them up after working or just use an alcohol bath?

Injected 1V Q7520 gets very hot but when removed it, short remains PIN 1 Q7520: 0.2 O to ground Suspect PPBUS_S5_HS_OTHER_ISNS is short

Resistance L7630: 280 L7430: 336 L7560: 60kO L7520: 530 L7130: 1.4MO L7310: 11O L7320: 11O L7701: 33kO Voltage injection on pin 2 of 7140 fuse? 5V? 1A

OK I was wrong, which means I f'd up the report above. 0V on pin 2 of F7140 Took out F7140 8.6 V on pin 1 when F7140 out put it back, 0 volts and short to ground on both 1&2 of 7140 7140 has continuity PPBUS_G3H is short to ground after the fuse R5440 or U5450 pulling the G3H rail to ground...

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...

Replaced U7701 Machine now boots and works

BKLT_PLT_RST_L present ----> 3.32V No spill, Initially, no fan spin. Corrosion was noted at C7400 and C7425 Both replaced. Now fan spin with dim back light. PRAM rest no improvement change U7701?

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...

No

UPDATE: BAD TRACE BETWEEN 5110 and C5111 Rebuilt the trace and now have green light, still no fan spin PPBUS_G3H now 8.60 V

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...

U7560 6,7,8: 0 V 1: 8.60V U7501 4: 0 V 12: 3.40 13: 0 21: 3.39 22: 0 23: 1.07 25: 0.62 V 26: 1.06 29: 1.23 DIODE 22: .55V 29: 0.45V L7520: .426V L7560: 0.36V NOTICED C7581 and C7583 missing endcaps replaced them FAN SPIN!!

replaced D7012. Now have green light. No fan spin PPBUS_G3H now at 8.60V USB PORT is working. U7400 PIN 12: PP5V_S5: 1.22V DIODE MODE, pin 12 here is 0.447V