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yes, just now tryed a bios from vinafix (https://vinafix.com/threads/j110-820-00164-051-00384.20625/) but same, but i dont know if the bios is good i have the board only with the dcin connected on the desk, no lio flex

820-00164 board dont show a display no dong i have the usb tester A4551 from chipmunk shows 2 red leds but the green one is not do anything BT_PWRRESET_L 3.3V PM_PCH_SYS_PWROK 3.41V PM_PCH_PWROK 3.41 RTC_RESET_L is 3.31V PPVRTC_G3H is 3.33V PCH_CLK32K_RTCX1 has a nice 32.7 puls under infrared...

ok. so i soldered now 2 cables on C8553 and C8554 build in the board and signals are there scl has a clock and sda has data signals

i disconnected the display and checked pin 26 and 24 on the flex cable both 5.01V but on scope no communication to see may be because display is not connected

checked now PPVIN_S0SW_LCDBKLT_R is 12.93V, is ok in my opinion LCDBKLT_EN_L is as well 12.93V should be zero i think? ah ok, just read your post 2informaticos so I checked R8450 and R8451 both 0 Ohm and R8452 and R8453 both 1.8Ohm

so, if PPVOUT_S0_LCD_BKLT is 0V then 8400 is not switching on or PPVOUT_S0_LCD_BKLT is short to GND in diode mode PPVOUT_S0_LCD_BKLT to GND is .804 F8400 is ok maybe LCDBKLT_EN_L is not working, how it is switching from U8400 SD-Pin? should be Low if turned on isnt it?

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