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  1. nik1981

    820-00928 With a power cycle issue

    I have an 820-00928 that when plugged in jumps from 5v to 20v and pulls up to 1.8a but then reboots the charger back to 0.2a. The screen shows the battery and then goes off again when the charger drops back to 0.2a Does this on all 4 ports. I've checked U3100, U3200, UB300, UB400 and the main...
  2. nik1981

    820-01700 with 5v only [SOLVED]

    Hello, I have an 820-01700 that won't power on. No signs of liquid. Just stopped charging. With the board out, on 3 of the ports I get 5.12v 0.37-0.39a and the 4th port (left side front) I get 5.14v but only 0.13a. With the 3 ports I get 12.2v constant on PPBUS but 0v on the low port. If I...
  3. nik1981

    A1708 820-00840 No backlight (SOLVED)

    I have an 820-00840 with no backlight. Tried multiple screens but no difference. Took the board out and it seems that Q8400 is getting its 12.9v PPVIN on pin 4 but the hate voltage is also 12.9v on pin 3 so isn't opening. I can't seem to figure out why pin 3 isn't dropping. The resistance...
  4. nik1981

    A1932 Keyboard replacement

    Hello, does anyone know a way around the function key mapping issue on replacement keyboards? This A1932 has a replacement keyboard but without access to the AST 2 server, I can't see a way around getting the function keys to work again. Just to be clear, the keyboard isn't faulty, its just...
  5. nik1981

    820-00928 20v 40ma

    Hello, I have an 820-00928 with 20v and only 0.04a which jumps to 0.40a and back again every 15 seconds. No obvious signs of liquid and wont start on SMC bypass Testing board on the side only with only a dc in board connected, I get: PPBUS_G3H = 12.52 PP3V3_S0 = pulsing ALL_SYS_PWRGD =...
  6. nik1981

    Not a Mac but a charging circuit issue

    I've spent the last week trying to sort my sons brand new Acer laptop for a charging issue after liquid damage. Originally it wouldn't turn on but I found shorting caps on the 19VB_CHG circuit. Replaced those with the same and the laptop fired up fine, works on charger or battery but won't...
  7. nik1981

    820-3115 No CPU Vcore

    I have an 820-3115 liquid damage around SMC. Originally no magsafe light. Removed and reballed SMC, now I get magsafe and fan spin with the fan at full speed after 5 seconds. CPU has a little heat in it after a min or so. ALL_SYS_PWRGD = 3.29v PPVCORE_S0_CPU = 0.00v I'm stuck with this one...
  8. nik1981

    820-00875 dead short on PPBUS_G3H_CPU

    Hi I have an 00875 board with an exploded C7222. Removed the capacitor and others around it on PPBUS_G3H_CPU. PPBUS_G3H_CPU is still shorting to ground with them removed but I can't locate the short anywhere. Its 0.000v on diode mode. I've tried a little voltage an some alcohol to see if...
  9. nik1981

    820-00165 liquid, no fan spin but orange light [solved]

    I have an 820-00165 with no fan spin after liquid damage. Orange light and SMC reset goes green and back to orange. Liquid damage around U5110 cleaned up. PPBUS_G3H = 8.52v PP5V_S5 = 4.98v PP3V3_S5 = 3.32v PM_SLP_S4_L = 0v SMC_PM_G2_EN = 3.4v PPVRTC_G3H = 3.3v PM_DSW_PWRGD = 3.4v PP3V3_SUS =...
  10. nik1981

    820-00165 No backlight [solved]

    Hi I have a liquid damaged Air with no display. I've changed over a slightly burnt LVDS connector, change a couple of ugly looking caps and replaced U7701 and tried another screen also. I'm still getting no backlight and I'm stuck. I'm getting a display though 8.5v on L7701 LCDBLT_BOOST 8.5v...
  11. nik1981

    A1706 SSD issue after a drink

    Hi, I have an A1706 that has been given a little drink at the side of the keyboard right where the SSD chip is. Turns on but doesn?t see the SSD I took the board out and cleaned the small amount of crap near the SSD. Put the board back in and checked it. Now it sees the SSD, boots and runs...
  12. nik1981

    820-3437 Works on charger but not battery

    Hi, I have a 820-3437 MBA that came in as not turning on. (no liquid damage but just didn't turn on one morning) Found a shorting cap C7431 (PPBUS_S5_HS_COMPUTING_ISNS) Thought it was going to be very easy as it was replaced and diode tested okay. Turns on now and boots, sees the battery serial...
  13. nik1981

    820-00875 PPBUS_G3H boosting after liquid damage

    Hi, I have a 00875 thats had liquid damage over the U7650 side of the board. After going through the UC, the laptop started from the battery and got into the OS but I walked away and came back to it turned off. Not sure if the battery is drained or something else. I don't have a spare battery...
  14. nik1981

    820-3115 Not always charging battery

    I have an 820-3115-B with a intermittent fault. It always turns on with a charged battery but doesn't always charge the battery. When it doesn't charge, theres no green or orange light. When it does charge, it shows orange light as normal. I've noticed that if its in a charging kind of mood...
  15. nik1981

    820-00687 doesn't seem to turn on

    I have an A1534 which came in with a broken screen and a flat battery. The screen assembly was replaced and it doesn't seem to have any signs of life apart from the led on the board. I've checked the basics but I'm at a loss. It was with another company first but they apparently "hadn't touched...
  16. nik1981

    820-00165 No fan spin - Pulses nearly everywhere

    Yet another 820-00165 and this one came from a bent mac air. Looks like its only bent down the SMC end so hopefully not another dead CPU PPBUS_G3H = sits at 8.59v and drops to 8.3v every 2 seconds PP3v42_G3H = 3.42v stable PP5V_S5 = 5v pulses PP3v3_S5 = 3.3v pulses SMC_PM_G2_EN = 3.3v pulses...
  17. nik1981

    00165 liquid - Q7310 :(

    00165 board with liquid damage MagSafe but no fan F7140 had 8.6v on pin 1 and 0.2v on pin2 but it wasn't blown Stuck 5v onto pin 2 to see if anything warmed up. U7310 was getting warm so swapped that, then I noticed Q7310 on the other side was also getting warm. Swapped it and now PPBUS is...
  18. nik1981

    [SOLVED]820-3115-B no PP3v3_S5 or PP5v_S5

    Liquid damage near rear vent SMC etc. Came from another repair place that seems to have told a blind man to brush the board with his old toothbrush. Stuck it through the UC, plugged it in and get a green light but no spin. PP3V3_S5 is 0.0v with a 0.107v diode mode PP5v_s5 is 0.995v with 0.007v...
  19. nik1981

    [SOLVED]820-00165 no fan spin but has magsafe

    Hi all, I have another 820-00165 with no fan spin after liquid damage. Traces of liquid near SMC, U7701 and U3210. Ultrasonic cleaned, jump wire from C3286 pin 1 to pin 18 of U3210 as the test point between them had nearly vanished. U7701 removed and replaced as it looked bad and I couldn't...
  20. nik1981

    [SOLVED]820-00165 No magsafe, missing 5v & 3.3v

    Hi, I have another 00165 board that has had liquid damage. Cleaned and had magsafe light for a while but wouldn't spin the fan. I left it for a few days while I repaired others, but when I came back to it, its back to no magsafe again. PPBUS_G3H = 8.2v PP3v42_G3H = 3.4v PPBUS_S5_HS_COMP_ISNS...
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