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still no progress in this case EDP_BKLT_EN = 3.35V and R8442 is 0 Ohm BKLT_SCL/SDA lines both have .529 external Display showing good 2 NEW Displays tested for working in other machine, working good, with this machine no backlight

I found another, a real 820-3299. plugged in only with power and extern display cable I get a picture

I cleaned the thunderbolt pins and the corresponding area on both sides from the MLB TBT_A/B_HPD when disconnected is 0V, if connceted is 3.24V but no display to see I check only the mainboard with RAM and extern SSD and connected extern Display, nothing more connected

ok I will check that. But the client did nothing. He only want to connect an external display and notified that it is not possible. then he used the imac normaly until he decided to have a bigger drive. he bring the device to me for replacing and pleased me to have a look during replacing for...

yes, with an MBP 2011 15" working good and the client told me the problem as well. he notified the problem when he wanted to connect another display in home office. the machine came in to replace drive and check the connector problem

device is working good but no external display possible, both ports I can connect the cable but monitor has "no signal" dont found schematic and boardview but i took the 820-3299 seems to be similar. L9400 and L9600 both sides have 3.3V U9610 pin 19/20 3.3V TBTA/BPWRSW_EN is 3.3V TBT_S0_EN...

when I start the machine and light a bright light on the screen i can see what happens. I see the apple logo and then the user account. but now i saw that there is no touchbar activities. the tb should light up when comes up the user account isnt it?

i just work on this machine, no much experience with this model. i can see the picture but no backlight I bought a new display because i thought the problem is the backlight flex cable but same problem so i measured the IPD_LID_OEPN, if closed has 0V if open has 1.8V PP3V3_S0SW_LCD has 3.3V...

thanks thats it, found now everything.

File: https://drive.google.com/file/d/1V8yLO-19G3wXIXjo8sIaIJ2FxcM0sEni/view?usp=sharing this is the original bios file and in the pic the original serial and mlb i dont find the sn in the bios file. i want to replace it with another one

hi i replaced the mainboard for a client and i want to enter him the same serial in the bios file. in the 2011 machines its easy to find just looking for "ssn" in the 2010 device i cant find it, is it coded?

ok, so the best will be to replace the lcd, thank you.

Hi, I got this device with liquid damage. Mainboard is cleaned and was not many liquid to see. The display is not working. with another display the machine is working good. The big connector looks pretty good. I found that there is a burned backlight connector. So i soldered a nice...

I checked now again PP3V3_S0 is ok there is no PP5V-S4_REG U7600 and Q7650 and Q7655 are replaced already PM_EN_REG_P5V_S4_R (EN2) is 3.3V it is lighning only the first led from the mainboard

the client gave me now his original 85w charger is there any way to test it ?

is it possible that there could be from the beginning the main problem a bad dc-in board? can to much current caused by a bad dc-in board damage the u7100 and r7121/2 ?

I tryed with my original charger , no problems. my client told me he have a good original one too, here a pic. can u imagine that it could be possible a bad dc in board?

is it possible that the dc-in was the problem ? yes, i have a original charger, will try that, had only the lab-unit tryed

I have this device here, no green/orange light, dont turn on. found short R7121 Pin 1 to ground and high resistant R7121 and R7122 after replacing u7100 there was no short anymore. So i replaced the R7121 and R7122 after that all was ok but i found there goes 6A in to the machine. So I...

yes, that was for me the intresting part as well. now i checked again and yes there is no 5V_S0, but I replaced already U7600 inbetween so I measured bad S4 or bad S5 and have now a bad U7600. I am gonna replace it again and will post the measurements after that.