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Hello Everybody I'm working on 820-3437-B. Machine came my desk doesn't turn on and not fan spining, when i check board too little corrosion around r7520 . after cleaned fan turns on but not chine and nothing screen. When checked voltage PPVCC_S0_CPU = 0 v CPU_VR_EN = 0.99 v ALL_SYS_PWRGD =...

Thank you for suggestion dukefawks after your post checked SMC_LID and its shorted ground... Replaced SMC solved problem now working keyboard and trackpad without problem.

Yes i tried PRAM and SMC reset doesnt change... Is it could be cause by SMC ( machine came liquid damaged SMC are but working every things with out keyboard and trackpad) I was reflow SMC didint change.. I spoke few pc notebook repair tech. , they suggest I/O controller replace (they called ENE...

Sorry Duke i try it but same thing fan start to high speed and keyboard also doesnt work:( My brain burned i cant understand what is happening... When i start to mac os in verbose mode and hitting caps lock key ( for led status) capslock led turning on and off until bluetooth driver load after...

Yes in system profile shows in usb device...

When i checked trackpad connector to U5701 every line OK, 18.5V and 3.42V OK. Replaced U5701,U5750,Q5701 nothing changed. When i press option key at start up trackpad and keyboard working at this screen(trackpad click doesnt work also its interesting) but after select disk for startup ( tried...

Hello Everybody I'm working on liquid damaged around EFI macbook PRO, Cleaned and replaced few resistors and capacitors looking bad . Machine starting with out problem but when loaded OS stop working keyboard and trackpad. For example when i push down alt key when starting machine shows boot...