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ok so after replacing r7021 and r7022 with good ones from another board i plugged it in and instantly they blown and went bad again.. i pulled everything on the line between pins 27 and 28 and the short was still there so finally it was clear, the ISL is bad! i replaced the ISL with a new one...

ok after some more measuring r7021 and r7022 reading o.l and 37k ohms bad resistors? need to go along with the isl or just those? could make sense that this the problem? btw, the reason for not having green light is probably because the dc in board. couldn't get another dc in board but...

i have no u5110 on this boardview or schematic for 820-3332 on u7000 pin 1 = 0.028v pin 2 = 16.41v pin 3 = 1.51v pin 19 = 5.39v pin 20 = 5.43v pin 9 = 0.033v pin 15 = 0.060v pin 27 = 0.031v pin 28 = 0.032v resistance between pin 17 and 18 of the isl (u7000) is 4.1 ohm resistance between pin...

hello working on a 820-3332-a logic board looks very clean, no liquid damage, under the microscope couldn’t find anything that looks bad… the board is dead, no light on the charger.. on F6905 i get around 16.73v on each side ppbus_g3h is 3.295v PP3V42_G3H is 3.393v resistance to ground...

strange enough looks like the board is in s0 state, the little led on the bottom is glowing when connected also, having 1.69v cpu vcore... but no image on display (connected the display and charger only) and also no chime on speaker... this is the first time working on this board is it suppose...

hello working on a a1543 820-00045 logicboard no liquid damage anywhere inside the machine when connected to charger does not power on, no response to keyboard trackpad is putting out force touch feedback when connected to the charger but no other sign of life.. pulled out the logicboard and...

ok looks like working very good! missing mic. connector but will get to that later.. any tips for soldering it? thank you!

i'm such a noob :) thank you duke, will update after testing it...

ok managed to reset pram with an external keyboard now i get a chime on the speaker connected but still the fan spinning fast install to a case and reset smc? should be ok now?

hello working on a liquid damaged 820-3476 a1502 board get a light on the charger and the fan is spinning. the fan is starting normally and after a few seconds increase speed almost to full speed... the board has cpu vcore 1.8v and usb mouse light up the liquid was around the dcin connector...

thanks both... is that the case in any PPBUS_G3H short involving the cpu mosfet?

hi john actually the one that was making the short was the other mosfet - Q7320, when i pulled him out the short was gone.. i replaced q7310 just in case.. does that make any diffrence? or still RIP for the cpu? also, i notice now that when i plug in the charger i get PM_SLP_S3 3.3v for a few...

hello having a strange thing with a 820-4924 (diffrent one from the one solved a few days ago) after liquid damage, had a hard short to ground on PPBUS_G3H the short to ground was solved by replacing the two mosfets - Q7310 and Q7320 from a donor board.. now i get 12.54v on PPBUS_G3H. still...

update: i replaced u8080 again, seems like the one from the donor board was probably no good like duke said - wasn't pulling the EN signal as it should.. i got the fan spinning and board is back to life! SOLVED! thanks to duke and JohnB...!

i can't read resistance to ground on P5VS0_EN, i think it's 0 (tried from pin 2 of u8080 and also from the c8187 pin) but didn't get resistance to ground.. is it worth trying to replacing the cap \ resistors on this line? i figure the EN signal will be created by those.. or try another u8080...

on L7520 i get pulsing between 5.08v - 5.11v on L7560 3.32v on pin1 and pulsing on pin2 2.96-2.99 when i got it there was a little corrosion in the battery connector area other than that it was pretty clean...

it's around 60-74K ohms

measuring on the fan connector and also pin 1 on r1845 with the with multimeter on 2000k resistance mode i get 074 (black probe to the fan and the red to ground)...

Hello there friends... working on a 820-4924 liquid damaged board got it cleaned so no visible signs on corrosion.. measuring around the board, appears to be getting 1.04v on pp5v_s0 s3 and s5 are there reading 5.10v looking at u8080 is getting the input on pin 3 from s3 (5.10v) but the en...