Macbook A2338 820-02773 LT400

Instafixx

Active member

Jul 15, 2026

• #1

Wont turn on with Trackpad connected.
Disconnecting the trackpad it will turn on fully with LCD working.

LT400 was burned.
Reconstructed it and replaced the Coil.
Now it turns on but no backlight.

 

2informaticos

Administrator

Staff member

Jul 15, 2026

• #2

Do you still get backlight without trackpad connected?

 

Instafixx

Active member

Jul 16, 2026

• #3

Yes

 

2informaticos

Administrator

Staff member

Jul 17, 2026

• #4

Check IPD_LID_OPEN_1V8 signal w/ and w/o trackpad connected.
It should be always high.

 

Instafixx

Active member

Jul 18, 2026

• #5

Thanks. Issue Resolved.

 

Instafixx

Active member

Friday at 9:33 AM

• #6

Issue was solved but i know i am getting Sleep/wake issues and trackpad and KB not working.
AMR_RIGHT_OR_ND_1V8 was 1.3V
Replaced RR300 to force the signal to 1.8V

Sensor working fine. But no KB/TP
IPD_LID_OPEN_1V8 is always high.

 

2informaticos

Administrator

Staff member

Saturday at 4:05 PM

• #7

Disconnect KB and try to get TP working first.
Check all voltages for JT400.

 

Instafixx

Active member

Monday at 3:07 PM

• #8

The issue is random. Currently i connected all parts except KB - it is working fine
Then i connected KB - now both are working fine. .
I have disconnected the KB and kept it. Will observe.

If and when TP stops working - what should i do?

 

2informaticos

Administrator

Staff member

Monday at 9:10 PM

• #9

Try another TP flex.

 

Instafixx

Active member

Today at 8:29 AM

• #10

When TP stopped working next morning - i replaced the TP Flex and kept it with KB disconnected.
Now its been 24 hours and TP is still working. Can we conclude that TP Flex is the problem?