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  1. rob777

    820-00164 strange charging issues

    I’m stuck, need some advice please. This board works fine on charger with no battery installed. With a charged battery and no charger it also boots and works fine. When battery is installed and you plug charger in, the icon says not charging the battery briefly then shows no charger connected...
  2. rob777

    820-3476 no trackpad/keyboard

    Changed trackpad and flex already. Was minor water damage but not there trackpad or keyboard areas. keyboard has 3.3v at pin 30 and 3.4v at pin 4 trackpad has 5v pin 4 and 3.3v at pin 1 at one stage when testing pin1 on trackpad I touched ground too and it shorted and I had to replace r4808...
  3. rob777

    [SOLVED]820-3476 PPBUS_G3H = 4v

    Board had liquid damaged exclusively around U7100, cannot find evidence elsewhere. Board gets orange and green lights on charger but not power on. PPBUS_G3H measures a fluctuating 3.9 - 4.1v, removed F7140 and PPVBAT_G3H_CHRG_REG measures the same fluctuation. Changed U7100 numerous times...
  4. rob777

    820-2396 dead smc?

    820-2396 has green light. Seemed to of charged a dead battery. Zero evidence of liquid damage. Won't turn on. Ppbus g3h is 12.4v smc_reset_l is high at 3.4v im guessing this is why we are not turning on. I tried shorting it to ground as I assume that would be like doing an smc reset but no...
  5. rob777

    820-00163 no chime

    ok been working on this 820-00163 for a couple days now. It has orange and green lights on charger. fans spin but no chime and no display. Have checked with working display just in case it didn't chime or something in this model. History is i I replaced the display 12months ago. It has now...
  6. rob777

    [SOLVED]820-3536 Backlight

    Need some help please sorry.. ok so pin 1 at LCD connector I have 0v U7700 has pp5v__s0 going in. Ppvin_s0sw_lcdbklt_r is present going into u7700 and q7700. lcdbklt_sw is missing along with ppvin_s0sw_lcdbklt i have replace q7700 and reballed a used u7700 from donor board. Could the u7700...
  7. rob777

    iMac 820-3481 a1412

    Firstly does anyone have schematics for this model iMac? I can't find anywhere. Does anyone know the diagnostic leds mean on this model. I have the bottom one on, the next one up flashs on button push and the rest don't light up. Imac does not boot. Have gone though board, no liquid damage or...
  8. rob777

    [SOLVED]820-00045 no keyboard

    Hi Duke.. So I replaced the LCD today on the 2015 12in MacBook. Forgot to plug trackpad to motherboard in. Opened it and did it last however battery was still connected and I made smoke. Trackpad would then get really hot. And there was a burn mark on trackpad motherboard flex cable. Took...
  9. rob777

    [solved]820-3437

    Looking for help here. Works perfect until lid gets closed upon which I guess an smc reset keeps happening. When the lid is closed for a short while you hear the chime and it reboots and either comes back on or stays off. Then power button to get going again. Sometimes I have to do another smc...
  10. rob777

    [SOLVED]820-00165 no g3h

    just need some confirmation that my brain is working correctly here please. U7090 had very minor liquid damaged. Cleaned and still can't get ppbus_g3h. So no light on charger. After repairing u7090 the charger is very dim for a second only. So I tested for shorts on ppbus g3h. Can't find any...
  11. rob777

    iMac 27in Mid 2010 backlight

    Thanks Louis and Duke, haven't been on here in ages which means somebody is building up his repotoire of knowledge and skill! Anyway am stumped and looking for advice today. Mid 2010 IMac 27in. Backlight is gone however it does randomly come back on for no apparent reason. Then goes off again...
  12. rob777

    820-3209-a

    got a 820-3209 MacBook Air. Doing the 3 sos beeps. Ive spent 30mins measuring all the power rails for ram.. all there. Is this a common problem? I'm stuck again sorry hence the post.
  13. rob777

    820-2850 No power. Green light only

    hey guys. Been a while since posting. Must of learnt something! Am now stuck on a old 820-2580 board. Seconds away from giving up and this post is my last resort. PPBUS_G3H is not holding and is always changing values. From around 8v to 12.6v. F7040 is fine and I even changed U7000 off a...
  14. rob777

    [solved]820-00164

    Got a 820-00164 liquid damaged laptop off eBay that I'm trying to fix now. Super close to completion but of course I'm stuck somewhere. Laptop was sold not booting liquid damaged as is. I have it booting again and when connected to charger it now works perfect however it will not see any...
  15. rob777

    [SOLVED]820-3462 doesn't see battery

    I'm stuck here. I don't know what to measure. Got a 820-3462 board with not a sceric of water damage to be found under the microscope. Laptop works fine on cord but battery is always showing an X. Tried a new battery and a working second hand battery. Same prob. Power rails exist obviously...
  16. rob777

    [SOLVED]820-3209 pp3v3_s3

    Laptop would power on and got a screen on external monitor. No screen on laptop and no trackpad but keyboard does smc resets. Started measuring power rails, found pp3v3_s3 is only 1.5v wherever I measured. Obviously. Ended up at R7811, looked shit. Changed it. Laptop worked screen came on...
  17. rob777

    820-3023 U6100 Help

    Hey guys, bought myself another laptop to try and repair. Board doesn't chime, found some corrosion around u6100. Have my important power rails and have green/orange light on charger. Removed u6100, pads still ok put it back on as have nothing to change it with. Same readings before hand and...
  18. rob777

    [SOLVED] 820-3476 Help a beginner

    Hey guys, just diving in to board level laptop repairs here, I purchased a dead water damaged Macbook Air and also this Retina 13in to begin my learning quest. Macbook Air was repaired after hours and hours of watching Louis's videos which I'm absolutely stoked about! Thanks Louis! But now this...
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