A1418 Display not detected

knoxy

New Member

Join Date: Nov 2017

Posts: 6

Country: US
#1

A1418 Display not detected

08-06-2020, 08:38 PM

Having trouble with an imac a1418 (820-4668-A).

Backlight will flash on on first startup but otherwise the internal DP port is not working. Connecting to an external display works just fine.

Replaced:
F4400 with 0ohm resistor (Fuse was blown)
Display panel with known working display
Display connecter cable
Display connecter on mainboard

Curiously I am getting 12v on PP12V_LCD_F but only 7v on PP12V_LCD when the display is connected (Measured on either side of L4400)

Does that sound right and does anyone have any other ideas?
Attached Files

Apple J70 051-1407 rA00.zip (1.73 MB, 33 views)

Apple J70 820-4668 boardview.rar (88.8 KB, 42 views)
Tags: None
piernov

Super Moderator

Join Date: Jan 2016

Posts: 4435

Country: France
#2

08-07-2020, 04:10 AM

Re: A1418 Display not detected

Fuse probably blew for a reason. Not really a good idea to replace with a 0 ohm resistor. Measure resistance across it to check if it's gone bad again.
Measure resistance across L4400, and measure resistance to ground after L4400 with and without LCD connected.

OpenBoardView — https://github.com/OpenBoardView/OpenBoardView
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A1418 Display not detected

A1418 Display not detected

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