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Hi , never knew about dfu mode , ok ive got the laptop saying its in dfu mode , i go to actions but "restore" is greyed out , i did notice a padlock icon before the dfu picture , now this laptop belongs to a bank so im guessing it has security on it , could that be the reason i cant select...

Hi ive got an 820-00150 that came in totally dead , (charger faulty) had to replace 4 usb controllers and isl9240 , now board working apart from if you close the lid the laptop will not wake the screen, same on battery power or mains power , you have to hold your finger on the power button to...

no nothing

mmm didnt think of that , thought if i could hear the charger being plugged in and out the board was powering on but yep no usb activity , also cant find power rails page on the schematic , has it been replaced by the functional test points page ??

Hi , ive got an 820--01598 with no display, no signs of any liquid spill at all , board is very clean , ive tried 2 new screens . I can hear the charger being put in and out . not sure what voltages i should have without the screen connected but i have 5V on PP5V_SOSW_LCD_R and 0v ON...

OK it has a dead hardrive and a faulty battery pack , starts up fine in another housing with another drive, im a bit confusssed , will these boards not power on from just the mains with no battery plugged in ?

yes i have another drive booting into os

dosnt start with battery and charger connected, it will display apple logo in smc bypass mode and gets to about 3/4 the way along the progress bar then goes to a white circle with a line through it, when its off with the battery connected it sits at 19.7v and draws .35 - .37 amp for approx 12...

Hi ive got an 820-00875 turning on and straight off, with board connected when you plug the charger in you will get the battery icon , with an amp meter connected it shows it goes to 19.6v and draws an amperage of .6a then goes down to .26a then off but stays at 19.6v , when measuring cpu vcore...

ok , dont know how this is possible but the problem was the trackpad cable in the end, very slight corrosion on the cable but why this stopped the laptop from turning on via battery power is a mystery

yes tried all of that :-( think im going mad

yes you got it :-)

bit of an odd one which im sure im missing something but banging my head so thought id put it out there, 820-00165 will not power on with battery power, now its not the keyboard the laptop will switch on and off fine with the mains connected , will even run from the battery once on, will even...

Hi finally got hold of some u8400 chips, changed it but also r8445 blown , now have an image , many thanks

Hi i have a water damaged 820-00850 that came in with back right usb not working but everthing else ok , it had water damage around u3200 so changed it and now usb working , i did knock off L3200 next to it but put it back on, before i started i did have a display and now i dont :-( , i have...

thanks to you both, although lio connector looked good, i removed it to find a bad 3v42 trace underneath, fixed the trace and replaced the connector and now green light plus backlight both working :-) , guess thats a lesson learnt and thats fix green light issue first before anything else

ok thats me being stupiud, i take it i should see around 3v but i get between .7 and .9v , doide readinmg is .502 so i dont think its a short, it looks like smc_lid comes from the smc ??

Hi john , think you could be right , i didnt mention it because i didnt think it was relevent but although the board powers on and to the user logon screen all be it without backlight but it also has no green or orange charge light , thought this would be a simple fix after getting the display...

Hi ive got an 820-00165 with a backlight issue, the problem is backlight does come on for a sec then goes off , it did have a liquid pill but only very light, ive change led driver just incase and c7796, c7797, c7799 just to be sure , i am getting 8.5v at L7701 so voltage is getting there

cant see any corrosion anywhere on this board but reflowed the smc just incase, tried without lio flex connected, i do get 3v42 without charger connected, get 3.3v at SMC_ONOFF_L and PM_PWRBTN_L does get a slight milliamp draw when i short SMC_ONOFF_L, could it be the smc is faulty somehow ...