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Customer states the Mac was working until the battery went dead. Was 5v on USB meter. Found short at U4700. Replaced. Now 20v. NO amp draw. Seems stuck in S5 state. Missing PM_RSMRST_L? Not sure how this would be related to the original issue.

This mac crashes and kernel panics when trying to wake from sleep after ~5 mins.Only way to get it back is to force shut off and power up. Acts normal otherwise other than when you force it to power off the fans will run up just as it dies. All values at J4802 match working board. Replaced...

Liquid damage to backlight area on board. replaced shorted cap C8462 and F8400. LCDBKLT_EN_L: =12.6V BKLT SCL/SDA= 5.1V BKLT EN R =3.3V PP5V_S0_BKLT_D/A= 5V DP_INT_HPD= goes to 3.3V R8450/1/2/3 all good resistance and diode values check out PPVOUT_S0_LCDBKLT_F = diode value is low at .12 -...

Obvious was the Hard drive but swapped to SSD, PRAM Resets, tried different ram just in case... I'm guessing it's either BIOS or CPU.. Would you be willing to see if you can fix the attached BIOS? My Medusa doesn't have the right file.

Hi there, if I let this iMac go to deep sleep, it either will not wake up from sleep or it will crash and restart. Sometimes the backlight comes on but screen stays blank. I believe I've seen this before a couple of times with this year/model and ended up with a new board and CPU to fix. Is...

This board had 6 nands but when trying to reball 2 of my donor Nands were damaged. From Iboff's video it appears I can still transfer the remaining 4 but I need to cutoff 3v3 for ocarina on the two FLP's to make them NFLP's. Would removing R5610 be the easiest way to cutoff the U9100/9200?

Hi there, had some shorts on the LDO's U3100 and U3200 Replaced both CD3215s and shorts gone and now all 4 ports are 5V and resetting. Missing LDO 1V1 on U3100, Checked resistors around it and diode check and everything looks good. Tried rom from different board and same behavior all ports act...

It does go to DFU so I tried DFU revive and restore. Board goes to 20V and draws up to about 100 mA but then back to 0. No shorts on the coils. I replaced U7400 as it was getting hot. That is no longer getting hot but Im guessing it's cpu issue if PM_SLP_SUS_L is unstable? Following the power up...

This has new battery that is reading 7300 mah and normal but when the Mac is working and I’ve been able to hammer the gpu and such the battery only lasts a little over an hour. I believe it had this issue before I changed the battery though also. It sometimes restarts during boot or just...

I was testing and saw low resistance on PP3v3_G3H_RTC at one of the CD3217 U3100_T. I thought easy problem. Swapped the CD3217, tested diode and was normal. Powered it up and nothing. Checked it again and it seemed like it was blown again same spot but then I realized that if I waited a while...

Mouse tracking is sometimes unresponsive but sometimes works normal but it is consistently noticeable that it isn’t working correctly. This acts like a bad trackpad or cable but I tried both from MacBook that work normally and issue persists. I also connected external mouse and works normal so...

Hi there, this board occassionallyy will briefly take some amperage and drop just below 20V like its going to boot but 95% of the time it just sits at 0A and 20V. PPBUS is at 13V. All S5 rails are missing when in the 20V 0A state. I have detected voltage on CPU rails on occasions when it is...

I thought this iMac had fusion drive issue or maybe was the original problem but I think there is issue with the bios. It will load mojave and big sur but has issues loaading monterey and ventura. I can boot them if drive is preloaded with ventura but it won't update and when trying to install...

Hi there,, I have a clean board that boots but is having issues reloading. When trying to recover it loads the OS through wifi and/or ethernet but after the first screen hitting continue it claims it can't communicate with the recovery servers and exits the install. I tried loading from...

I've tested this with known good screen and also different LCD cable. At first I thought simple U8400 issue so replaced. No change as LCDBKLT_EN_L is not getting pulled down. SDA/SCL lines diode tests good and resistors are good. No edp_bklt_en. Discovered cap broken but still present next to...

This iMac boots normal. It then display goes off and doesn’t come back on. When display is off only 2 LED indicators on and no external display either. Sometimes it will come back on and reboot on its own , but usually it just stays off. It will with enough time boot up again with proper...

This board will usually boot fine the first time but will often not turn back on with or without battery plugged in. On bench nothing plugged in if I shutoff by grounding SMC_ONOFF_L it wont restart. IN this state, I get 3.4V at SMC_ONOFF_L with and without keyboard plugged in. When triggering...

Once this mac goes to sleep the screen backlight will not come on with key press, lid close/open, etc... the Keyboard backlight works as it should goes off during sleep, wakes after lid open, etc.. SMC_LID is consistent 3v3. I tried Clean ME, updating, upgrading, external OS. Also, Image is...

I can see image on original screen and test screen but no backlight. EDP_BKLT is present. No signs of liquid damage or corrosion. Below are the Q8400 and U8400 voltages. Q8400: pin 3: 12.6V pin 4: 13.1V pin 1,2,5,6: <2V U8400: pin 1,2: 0.3V pin 4: 0.0V pin 5: 5.1V pin 9,10: 13.1V pin 11...

Have a 00239 a1706 board that has been a royal PITA. Ldo 3v3 was shorted on 3! (assuming customer had junk charger or dongle) of the cd3215’s (assuming customer had junk charger or dongle) and ultimately the last cd3215 wasn’t shorted but was not showing any voltage so had to replace it anyway...