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I don't know exact history. The customer is kind of a weird guy who is really hard to have a conversation with. A man of few words. It has been in an AASP where they just offered him to replace the MLB. I can not see any corrosion anywhere but when I looked on the board under the microscope I...

This information has been shared on this forum for as long as it has existed. Now you make a giant post about it 10 days before the program closes.

This one does not detect internal SSD. It shows the blinking folder icon. The SSD works in another machine (and no SSD works in this one) The computer is fine when booted from external USB harddisk Where do I start ?

Check if Z2_BOOST_EN is high at U5805 while trackpad is connected. If high it should be boosting and could be broken U5805 or bad circuitry around here. Inspect for broken traces and damaged components in booster circuitry. Check if 18V comes on at any point at the 18V5S4 rail.

Is 3.3V also present on J5800 pin 22?

PPVCORE_GPU should be 1V :-(

Have you tried a PRAM/NVRAM reset?

Bingo! Working! Thanks yet again Mr Duke

Thanks. Just the confirmation I needed before switching them...

The light in magsafe is supposed to be orange.

I got this MBP 17" It turns off when powered from battery and the charge goes below 70%. After this it can only start again when power supply is connected. It then starts to slowly charge. It takes long time to get to 100%. Tried another battery - same symptoms. Cannot start from battery...

Got a pal in an AASP so they are gonna change it :-)

Spot on! Gonna take it to Apple. Thanks

10K (measured in circuit)

I got this 820-2915 White colours on internal display are pink. - Passes Apples VST (several times) - External screen works perfectly - Tried a known working display assembly - Replaced LCD connector - Checked continuity from LCD connector LVDS data pins to MUX resistors - Reflowed GMUX Still...

I just had exactly same symptoms. Double check that you flash correct BIOS revisions. 820-3437-A and 820-3437-B are not same BIOS. It made me fight longer than necessary in this thread: https://www.rossmanngroup.com/boards...mage-on-screen

I got this one up and running after a long and lasting fight. It was the BIOS after all. I missed it because I accidentally flashed an A-revision BIOS but it is a B-revision board. But because the A-revision BIOS made same issues as the corrupted original BIOS it trolled me. After flashing...

Thanks Duke. It was U7090 shorted to GND Please mark solved

I have got a 820-3330 which is totally dead. I only have 0.3V on PPDCIN. All rails dead. Where should I look first (beside the DC-in fuse which is OK)

Nothing obvious. I will inspect carefully. Thanks for your time.