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Should A2337 output to external video with LCD panel removed?

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tawnytim

Member
As the title states, I've got a A2337 which powers up(chime, caps lock, etc) but I can't get it to output to external video(screen removed).
 
T

tawnytim

Member
2informaticos said:
Do you have USB activity?
There may be a problem with thunderbolt connection.
Click to expand...
I connected a USB flash drive which has an LED which blinks when it's being accessed. There was no blinking so I'd say there is no USB activity. Possible this device is *not* booted, despite the caps lock functioning correctly? What else can I check?
 
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tawnytim

Member
I found some damage to the video header on the bottom side of the board and also what looked like a small coil or resistor which was blown off one of its pads. I can't find a boardview and schematic though - 820-02899-A
 
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tawnytim

Member
I cleaned up the header and replaced the resistor but that didn't change anything. Still the startup chime, 20v, pulling about 1.5a, caps lock working, no video output, still no usb activity.
 
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tawnytim

Member
I have been meaning to order that tester - thank you for the link, I will order it this morning. I have other simple testers and yes, I have 5v output to USB.
 
2informaticos

2informaticos

Administrator
Staff member
You may have problems with USB communication.
That impede external video to work.

Tried PRAM reset?
 
T

tawnytim

Member
I didn't know there was a PRAM reset on M1, or any apple silicon. There is? Just CMD-OPT-P-R like the intel macbooks?
 
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