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presented here is whether each IC outputs the correct signal. (See the I/O and Pin No. diagram.)
In other words, is it constantly switching between 5V or 3.3V (H) and 0V (L) as described earlier.
I/O and Pin No. Diagram
After the power is turned on, the ASIC (CPU) initializes and checks each IC.
The ROM and SRAM are checked.
If initialization fails for the ICs, the system will not boot up.
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