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I've got an A1707 820-00281 which shows a padlock when option key is press. I've read the BIOS and replaced all contents between $SVS with FF. When i try and boot the MacBook it still shows the padlock, when i read the BIOS again all the information between $SVS has returned. I tried to...

No liquid damage found on the board. 3 ports were going at 5v 0.42A replaced UB300 as it had a short to ground on PP3V3_UPC_TA_LDO. That is now cleared and I get 3.3v on that line. The board is missing PP3V3_S5 and PP5V_S5_LDO (not sure if they are supposed to be present at 5v) My main concern...

820-02020 which has suffered liquid but still turns on and working fine apart from the Wi-Fi greyed out. The damage was near to the WiFi chip. I replaced UL001 & CL071 as they were both corroded. Also noticed that the TP for WLBT_PWR_EN was damaged so i've ran a trace from JL103 to the TP. this...

This has landed on my bench with just stopped working one day and has no power. Hooked up to my bench supply (max 5A) gives 12v 0A. I've check for a short to ground on the Caps - nothing found. As soon as I connect my bench supply to the board I get a jump of amps from 0.06 to 0.00 and...

This has come from another shop who have said that they tested the screen and it works fine. No image or backlight on the screen but works fine on external. I've tried SMC replacing the battery PRAM, all the usual but still no backlight or image. On the diagnostic LED's they don't appear like...

I have an 820-02020 which had liquid damage around the touchbar connector JT700 - I've replace this and also order a new touchbar due to the flex connector being corroded. Before taking the damage TB off I thought I would try using both my test rig (not sure if the TB works on it) and also on a...

I have an 820-01949 which has been to another shop for a failed repair. Its a 4 USB port MacBook and strangely I'm getting 20v and some current (0.40A before going back to 0A) and on the other side, i'm getting 5v 0.24A constant and on the other 5v 0.24v boot loop. Could this be the CD3215...

We have an iMac Pro 27" 2017 here that someone has tried to repair but in taking the logicboard out have pulled a component off. The original fault was that it wasn't booting, which I suspect is a problem with the T2 but they decided to replace the power board and hence damaged the board. Can...

Very small amount of liquid damage on the LCDBKLT caps (C8469, C8411) and around the U3700 Wifi. Stuck it in the ultrasonic cleaner and replaced the 2 caps. Still on 20v 0a. Started trouble shoots the rails: PPBUS - 13.10v PP3V3_S5 - fluctuating PP5V_S4 - fluctuating PP5V-S5 -fluctuating...

Does anyone have a firmware for 820-01987 U2890 chip is W25Q80DVUXIE. I have a burnt one here pin7 is completely corroded and i'm think that it's damaged. I've got spare chips and I can get the adaptor but want to check if anyone can give me a working firmware before I order the adaptor. Thanks

Would someone be kind enough to clean the ME for me. All rail voltages are present including PPVCC_S0_CPU. No liquid damage and I get fan spin. I'm suspecting there might be a problem with the BIOS/EFI but I don't have the means to clean the ME. If needed they have Big Sur installed on the SSD...

Are CD3217B12 firmware protected? I tried searching the forum for the answer to this question. I have an A1932 board and tried what I thought 3 x CD3217B12 which have come from various board in the past (not sure which model) and none of them are behaving properly. Also I've a stencil for this...

I've got an 820-01987 which the customer says just switched off. I've had a look under the microscope and there is no sign of any liquid damage to any of the components. It's been ultrasonic cleaned and after probing around I've noticed that all the AWAKE and SLPS2R rails are pulsing. These all...

I've got a 2017 MBA which the customer brought in after installing Big Sur (I think they did an upgrade). They reported that after the install completed the MacBook wouldn't boot at all. If I try and start the MacBook the fan will spin for about 4 seconds then stop and restart again. I've check...

Hi. I have a 820-00165 which had a burnt J3501. This has now been removed. Not sure how this happened and why it burnt as no other components have been effected. I've also remove the JTAG as this had a small amount of corrosion and I've replaced C3287, R3561, C3560 & U3560 just for giggles...

Hi Can any confirm if the U9850 on the above board has firmware. I have 2 identical board here with the same problem no internal image/backlight and I purchased from AliExpress 5 x CBTL06142EEE and it still not working. I've read mix posts on different forums about it having firmware. Thanks

I have the above, clean as a whistle no liquid damage at all anywhere on the board. USB showing 5v. Checked PP3V3_G3H and it was 0v shorted to ground. Located C7081 to be problem, replaced and now PP3V3_G3H shows 2.2v. Removed R6923 and pin 1 is 3.42v so that problem is on the board side...

I have the above which had mild liquid damage around the board which has now been fix and the logicboard is working but my problem is the battery. It will work with both the power lead and battery connected or just the power lead but if I pull the power lead out with the battery connected it...

Liquid damaged 820-00923 using 820-00293 Schematics and BV. I have all rails present apart from the following : PPVCC_S0_CPU PPVCCGT_S0_CPU PPVCCEDRAM_S0_CPU PP0V6_S0_DDRVTT I believe the last 2 won't have any voltages until the top 2 are working. Both the top 2 come from the U7100 I've...