Recent content by MUUK

Mac Pro 2013 - Fan not working. Found that the interposer cable between the fan/wifi part and the i/o board was burnt. Traced back to the reverse of the i/o board (the connector in the picture is the i/o interposer connector) and can see a burnt component. I'm suspecting its a resistor but no...

Thanks, will check it out.

Yes i know that its normally the U8900 causing problem but its not in this case. This board has been seriously fucked with (GPU replaced, badly) so want to see if i can run it on intel only. I'm just wondering if anyone has figured out how to bypass this in hardware (similar to the GMux bypass...

Fucking ultrasonic fixed it. Thanks for your help.

Thanks, Was just looking at Q7802. Replaced it (have already replaced R7860/62) Real head scratcher.

If i heat Q7860 it will boot a whole OS and run until shut off. I tried replacing Q7860 again, and all the surrounding components.

resistance to ground of 5V_S0 28k Yes 5V_S3 is present at 5v if Q7860 is removed.

ISL looks fine. 4ohm and 20.4ohm on the readings. Do get pulses at the big coils PP1V5, PP5_S3 etc. Nothing on CPU ones. No change in SMC bypass mode. Wanted to see if it was the S3 or the S0 causing the issue. Removed Q7860. With Q7860 removed PP5V_S3 is 5v. Suspected Q7860, replaced it...

Both look and measure ok (180K and 150k). On pin 2 (input) i get a totally steady 12.56v On pin 1 (both, seperatley) I get 12.33v, which jumps (very quick change on multimeter - decimal point jumps about with fan pulse)

Minor liquid damage. Fan spins for a couple of seconds then repeats. PP5V_S3 jumps from 0.2 to something as fan goes on and off PP5V_S0 jumps from 0.6 to something as fan goes on and off. Cannot see anything on either of these lines that is suspicious. Diode mode PP5V_S3 0.430 Diode mode...

Made it back to the top of the pile, went through everything again. Noticed that FL8303 was chipped replaced it and it now works. Thanks for your help.

Yes whole new assembly. Also tried new LVDS/edp cable on the old screen. Tried with phone torch and mircoscope LED ring. Cannot see anything. PWM does not change with brightness keys. If both internal and external displays attached i get the Apple logo / ALT key screens on the external (as if...

Yes, 2015 15" known good screen testing with. Totally don't get it at all.

Seems like this has a much similar eDP/LVDS area to the 820-00163 which i do have boardview / donor for. With LCD attached and machine powered i do get (pin 5) PP3V3_S0_EDP_SW = 3.3v (pin 8 ) LCD_BKLT_PWM_R = 2.4v (pin 9) LCD_HPD_CONN = 3.3v (pins 28-30) PP5VR3V3_SW_LCD = 5v. comparing all...

My apologies that sentence was not clear. PPVOUT_S0_LCDBKLT is 0v when machine running with LCD attached. diode mode (LCD attached) 1.195 diode mode (LCD NOT attached) same 1.195