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This iMac 21,5" 2013 hat sensor issues after Ram upgrade by user. Only thing i could find was a missing CAP for ethernet (C4004) I replaced it and also U5600 (to be sure - it had scratches - from disassembely i guess) but no change. I cheched system temperatures and attached the result. Kernel...

Hello, this 820-00281 was waterdaamaged. Just J4402 and J3300 were burned (Pin 22 and 56). The rest of the machine looks fine. I replaced them and run a jumper for PP5V_S0_T139. Pin 56 on J3300 is just a Testpoint) After that i checked all pins for connection to the pads aswell as for shorts to...

Thank you for the answers. I did more research and it is 99% an error with U3900 (touchbar controller). So i measured the resistance from all pins on both connectors (in diode mode) compared these to a working one and there is no broken link or short but the reset for the display and 4 data...

This is starting to suck. I checked the liveboat and it looks perfektly fine. I reattached it and still the same error. I also noticed that it has no sound (no chime - even after PRAM Reset). And it boots fine into secure boot mode so i guess that the SSD should be fine?! Also first Aid shows no...

This A1707 was waterdamaged. I fixed all the waterdamage and it turns on again. I noticed two things: - it needs ~ 40 sec. until it shows anything but fans spin from the second i press the power button. - after a long boot time i get the same error as shown in the post on this forum (after...

I noticed that i cant do a PRAM reset. I connected the speakers (both) but cant get it to chime. But cpu is getting warm and fan is spinning... PPVCC_S0_CPU = 1.76V. I am really confuesed by this one. So maybe there cant be an image right now? Both enables (LCD_PSR_EN, EDP_PANEL_PWR) are low...

Than the problem should be U8340. 3V3_S0 is there at C8340, R8340 is <100K OHM, no shorts at Pins 1 & 4 but only 0.2V at Pin 4 and 0V at Pin 1...

Thank you for the answer. I mean that the light is blinkin when the mouse is upside down. So its searching a surface. If i move my finger close to the sensor it stays on... Its hard to see the light on my test moust if ist on the table the right way...Sorry for that.

This 820-3476 turns on and seems to work noemally. Board and also the rest of the machine look like new. CPU is getting hot, fan is spinning but no image (on internal LCD and external screen too) I checked: sys_pwrok = 3.4V, the light on an external mouse is blinkin, S0_LCDBKL = 0V. noticed no...

Ok. Thank you for the answer. I looked closly to the Bios IC and it (again) looks like i am not the first one here. I can see a little bit of flux under it. So chances are good that somebody messed with the bios already and may have causet this problems.... Also GPU looks like it has seen more...

This 820-2915 turns on but has no image. Also nothing on an external display. I also noticed that the sleep light is on all the time (SMC_LID is 3.4V) and that it wont chime (also no chime after NVRAM Reset). Next thing i noticed is that it also wont beep without ram installed. I checked...

No it was not cracked. It was just no image...

Yes it is. It beeps and the reading is always <10 Ohms

Thank you. Diode mode readings: c8320 = 0.279V c8321 = 0.280V c8322 = 0.282V c8323 = 0.282V c8324 = 0.284V c8325 = 0.282V c8326 = 0.282V c8327 = 0.285V c8328 = 0.282V c8329 = 0.283V

This 820-4924 was dropped. Now it shows nothing on the internal screen. On a external monitor it works normally and also recognizes the internal screen. If i look closely i can see that the LCD backlight is activating in the moment as the keyboard backlight turns on (same second the apple logo...

Thank you both for the help. It seems to be the cable. I unplugged it and now it seems to work fine. I keep testing it and come back to this if the problem is still there.

This 82-3115 seems to work normally but has intermitting issues. As i got it in it was booted up but everything on the screen that should be white was blue. After i disassembled it i cleaned a minor water damage and rebuild it. Now the color is normal again but it wont always allow OS Sierra to...

Thank you. This one works perfektly now even with the old IC.

I have no idea why but the link only works if you copy it and paste it manually in the browser. Sorry about that. is pulsing between 0.9 V and 1.3 V XDP_USB_EXTB_OC_L is 3.3 V XDP_USB_EXTC_OC_L is 3.3 V XDP_USB_EXTD_OC_L is 3.3 V As i was measuring i found what is shown in the attached...

I removed and saved the old Bios. After that i took a Bios IC from a china board, erased it and programmed the file you send me to it. Now the device boots up normal. I also uploaded the Bios File from the original IC here...