Hardware What can 3DS turn on even without ?

[A3660537JPN]

I have broken many cables of 3DS. It cannot turn on anymore. I need to remove or replace them. I want to remove as many of them as possible instead of replacement.
Can 3DS turn on even without the camera,the speaker,the joystick,the L/R buttons,or the 3 lower screen cables?

 

[Ryccardo]

On the official operating system?

Camera - required on N3DS
Speaker - doesn't matter
Analog - not required but remember the default position is the top left corner, not the middle
Buttons - not required and in fact impossible to tell if disconnected (but they may share the cable with something else)
Display - at least the backlight must be connected (or substituted with an equivalent load) - this is in fact an hardware requirement you can't beat by replacing the official kernel with GM9 or so (unless your replacement never tries to turn on the backlight)

 

[IC_]

I'm pretty sure it needs the speaker cable to boot too

 

[A3660537JPN]

On the official operating system?

Camera - required on N3DS
Speaker - doesn't matter
Analog - not required but remember the default position is the top left corner, not the middle
Buttons - not required and in fact impossible to tell if disconnected (but they may share the cable with something else)
Display - at least the backlight must be connected (or substituted with an equivalent load) - this is in fact an hardware requirement you can't beat by replacing the official kernel with GM9 or so (unless your replacement never tries to turn on the backlight)

Is the cable for backlight the longest of the 3?

 

[Ryccardo]

Is the cable for backlight the longest of the 3?

I don't know (every model is different) but, of the 4 pin ones, it's the one where immediately after the connector 1+2 and 3+4 merge into 2 wires

 

[A3660537JPN]

Can I use "an upper display which is made for NEW3DS XL/small or Old 3ds small " for Old 3DS XL?
Assuming it needs the speaker cable as Extrasklep said,
must I connect the speaker to not only the motherboard but also the upper display?

 

[IC_]

I doubt you can use screens from different models
The actual speakers don't have to be connected but I think it needs the speaker ribbon cable to boot

 

[A3660537JPN]

I report my result ; the cable which is next to the uppeer display backlight cable is not necessary .
Speakers may be removed by mistake but the speaker ribbon cable are necessary.

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The mic is not necssary.
I am using NEW3DSLL but the camera is not necessary in my case although I do not know why.

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The NFC cable is not necessary.

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I post many times because I report as soon as I find something.
As Ryccardo teached me, the backlight cable is necessary but the 2 others of the bottom display are not necessary.

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The upper display also requires only the backlight cable as the bottom display does.