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Hi all, This imac has dull black screen. means /i can see a sceen get powerd but black screen and no any postings. Board has all 4 LED on. I replaced the Grphic card, Screen, LCD power board, LCD cable, Main power board with known working parts, but still the same. So I asume this is a board...

Hi, THank you for your quick reply. Pins 18,19 of J8300 I get 3v just for a second. L8304 trace to R5670 is fine. tested with ex monitor USB's working fine. Checked the resistors around J8300 they all fine.

Hi All. Thia is liquid dmg board near LCD Connector. I have replaced the LCD connector and U8300 as it was not looking good. I dont get any voltage on data lines in R8361, R8362. Also EDP_PANEL_PWR is 0v. I cheked the LCD pins in diod mode and it seems ok with working board connector...

Hi THis is solved. I found R7005 again given me 13v. I replaced the ISL and R7005 both to gather. problem solved. Thank you so much for giving me advice where to check. You are a legend.

yes. but I dont get 5v on charger. R7005 was 40 ohms and pin 2 was 16v and pin 1 was 13v. I replaced the R7005 and C7005 now I get 15v on pin2 but still 3.7v on both side current snce resistors

Hi, THank you for your help. I get pin 19 20 5v when the battery connected. Replaced ISL 2 times.And also replaced Q7085

hi John I did replace ISL twice ..

I mean with out.

Just add this. There is no short in PPBUS_G3H. How ever ISL chip getting hot with our the battery. When the battery connected no boiling on U7000.

Hi all, THis is a liquid dmg board only near Q7030 ,Q7035, C7036,C7035,C7037. I replaced all these and still get 3.77v on R7021 & R7022 current sensing resistors. Resistance between R7021 & 21 is 21ohms and R7051/R7052 is 2.9ohms. I replaced U 7000 still the same. q7080 all pins have 16.5v...

hi, this is marked as solved. Issue was no 3.4 line coming to c5120. Thank you so mcuh for your help.

Thank you for your quick reply and helping me again. pin 1 3.4v 2,3,4 0v , pin 8/6 0v. pin 5/5 3.4 v. this is u5110 removed

Hi all, This is not a liquid damaged how ever c5120 was burnt and missing. replaced c5120/u5110/R5127/c5101/c5126/c5125/ r7100 still smc reset is 0v. Removed u5110 you get the green light and quater fan spins. Removed R7100 check SMC_RESET_L still 0v. C5126 comes 3v then gradually going down...

Hi, so sorry for not getting back for a month. I was out of the counrty for a month. I just wanted to tell you that I replaced the u9800 again and its working fine. Thank you so much for help.

all the sensor resdings on hw monitor is around 20c to 40c no anything high aran rpms are around 5500. I took the board out to check and put is back now no display again? :(

no fan issue at that time. it worked smoothly with external monitor. fan start high after replacing DPmux

yes connected everything properly. any evrything work properly including track pad. but fan goes high. when it starts left fan start first high then the righ one after few seconds. I will run HW Monitor and update you. thank you verymuch.

Geguis, Display is back:D. Thank you so much for helping me. one more issue now fan goes high from the start. but everythings works fine no slow any thing.

dp_int_hpd is 3.3v

wait. thats SMC. you recon I should replace the SMC? Coz this works fine with external monitor .