Re: A1398 820-00426 No display or backlight

Got it. Pins 9 and 10 on the LCD itself under the clutch had poor connection. I looked at it under the microscope and there was gunk in there. Hit it very carefully with 99% iso, let it dry, and reassembled it. Works great.

Re: A1398 820-00426 No display or backlight

This is my own MacBook. I don’t have ready access to another known good one, so I’m trying to work with what I’ve got.

I’ll definitely check those pins later.

I have a 2015 MacBook Pro A1398 with no display. The board number should be 820-00426. It does post, has a chime, and keyboard backlight comes on, so CPU does have power. Attached external display and it works fine.

There is no backlight and no display on LCD. I can shine a spotlight through back of screen with SSD removed, and no flashing folder appears.

Prelim tests showed two burnt resistors, R8351 (LCD_FSS) and R7701 (PP_BUS_LCDBKLT_PWR, LCDBKLT_EN_L). Checked for shorts to ground on LCD panel and LVDS cable, none found. Suspect internal intermittent short in...

Re: New Members - please post your introductions here

Hello, I am a former master technician with Honda/Acura. After an sudden, unexpected, but successful cosplay as a speedbump under a truck, I no longer work on cars. I have been tinkering with electronics my whole life, so relearning a bunch of things has been fun.

I live in Cape Cod at the moment, but we move all the time. My wife is active duty, and I attempt to tame the wild heathens that we call our kids.