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JohnB8812 have you had any situation like that?? or anyone have a problem like that ?? i heat the Graphic chip a bit and nothing change!! i need to be sure..

Ya you right!! i will replace the chip u1800 and reprogram again the bios with a clean me if don't solve i will leave this machine!! thank you !! you can close the post!!

OK !!! Problem Solved!! i Have a working board here and test all testing points around MUX and i notice pin129 (MUX) have a diferent resistence!! i turn on the board and i gets only 1.5V compare a working board 3.3V!!! i follow the line in schematic and i found a R9600 burned!! But don´t solve...

already test all caps and i have similar values on every data lines pair!!! yes it's very similar!! values around 1.091M - 94K Pair... GPU don't get's Warm!! i hear the tipical sound and pen drive blink but no image and no external video!

already replace a bios with one fresh clean me.. replace the IC bios for a other one, same history! i check again for missing components but it seems okay.. After 60-80sec shut down .. For turn on again i need to unplug the charge and put them again!

No, GPU it's good! Before reablling GMUX, i test with Heaven benchmark 10min and the machine didn't turn OFF! Usually if they have a problem with VRAM or Graphic chip the machine goes off 3 - 4 sec with heaven benchmark .. It's my way of testing these models! 2informaticos, i noticed that i...

Hey, this board before the problem mentioned in topic, works well but showing problem's like tipical GMUX on mac15 - 2009 boards. First i put the board in other mac pro 15 who knew it was good.. don't solve the problem.. next replace a connector for new one and don't solve again the problem...

Working on 3208 board, without any liquid damage or corrosion.. this board was been in another store and some asshole heat the U1800!! i already replace the bios, and cooler but same history!! i already double check for knockout components but seems to me everything is ok ! what can it be...

Smiba Greetings!!! ty for your reply!! I already solve the problem!! the problem was on U8902!!! Pin 1 was not connect to the board because the liquid! only see under Scoope!! i was only have 0.345V on PP1V8_S0SW_SSD_HOT !! Resolder the component, now i have 1.78V and SSD work's Fine Thank you...

Thank you for your reply Aprendiz But same history!! tried 5 times x5PRAM!!! after losing more than 3 days to repair this shit!!! I solve the problem, everything work's excepted SSD! =(

any suggestion ??

Forget the 1.33Gb part... is the online recovery... the disk are not listed in diskutil.

Working on this board with liquid damage around q7155, u8902, q5510. q4700. Needed to replace, q7155, u7100, r7104 and u8990. This board working fine but can't boot to SSD!! https://drive.google.com/file/d/10ChDky5zCeRrAASbXSCjbT-88qv7HWUK/view?usp=sharing Suggestions ?? Thank you

short on C6622 !! this post can be closed!! Thank you

hey guys, working on this board, and i have green light but unstable: PPBUS 12.60 - 12.35, PPVRTC_G3H, PP5V_S5, PP5V_SUS, PP5V_S3, PP5V_S0. PP3V3_S4 and PP3V3_SUS - OK! already replace isl 6259, and little reflow on SMC! no changes! ideas??

Ok 2informaticos!! thank you for your's reply's! i will resolder and double check on dead spots if missing any trace!! i will pos the results!!

3.4v on pins 12/13 . SMC_BC_ACOK - 0.606V and also check RTC signals- 3.4V and 32kHz OK!

3V42 - 3.42V SMC_RESET_L - 3.4V SMC_PM_G2_EN - 0.200V when you say basic signals for you Which are they?

Hey guy's working on 820 2936 with water damage around SMC, q5300, Q5310, U6990 and u2800 ! Trace already fixed: Pin1 R5301 to pin4 Q4260, U6990 and pin2 q3200 to pin2 r2578. i already replace ISL6259 and Replace SMC from donor board!! No changes, 12.32V on PPBus, SMC not running.. what...

Ya you right!! GPU problem!! But i already try reballing processor in other board and the processor was a little bent and the reballing goes bad!! you already try to reballing a processor like that?? anyone know to reballing this processor without bent?? i will appreciate any suggestion ...