If you do find a short circuit, you will need to hunt for and remove this short
before proceeding; otherwise you will damage the board, the screen, and/or the
power supply.
III.2A Testing the Board & Screen – screens with chips on FRONT
The following steps are for the original Sure screens which have the chips
and selector switch on the same side of the board as the LEDs. (The steps
for the new Sure screens are in section
III.2B
)
A)
With the screen facing right side up, so the LEDs are showing, ensure CS1,
(pin 1 of SW1) on the screen is flipped to the right/on position and pins 2, 3,
and 4 are all flush left.
17
Test for continuity
(or resistance)
across the 5V and
GND pads of the
prototyping area
Ensure CS1, pin 1
of SW1, on the
screen is flipped to
the right/on
position and
p
ins
2,3,4 are all flush
left
