(Topic ID: 261949)

Whirlwind Boot Up Takes Time?

By loren3233

4 years ago

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Latest reply 4 years ago by wayout440
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Whirlwind Williams, 1990

I have a WW that does not boot up right away when turned on. When I turn the power switch on I get GI and nothing else (no display or inserts flashing). It takes about one minute then it finishes the boot up. Its like it gets some heat to it then decides to finish the boot up process and game plays fine after that.

When I first turn the game on I get a solid led at the 5volt, Diagnostics led flashes slowly (not quickly like normal) and the blanking led is off. After the game fully boots which takes about a minute I get a solid led at the 5volt, Diagnostics led flashes quickly and the blanking led is solid (which is all normal).

I tested the test points on the power supply and get these readings.

TP1 - 5V
TP3 - 11.9V
TP4 - -14.6V

CPU board
TP2 - 5V

So the question is why is this not booting up properly when turned on? Would it be worthwhile to rebuild the power supply board? Could this bad RAM? Any ideas?

Thank you

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Quoted from loren3233:
I have a WW that does not boot up right away when turned on. When I turn the power switch on I get GI and nothing else (no display or inserts flashing). It takes about one minute then it finishes the boot up. Its like it gets some heat to it then decides to finish the boot up process and game plays fine after that.
When I first turn the game on I get a solid led at the 5volt, Diagnostics led flashes slowly (not quickly like normal) and the blanking led is off. After the game fully boots which takes about a minute I get a solid led at the 5volt, Diagnostics led flashes quickly and the blanking led is solid (which is all normal).
I tested the test points on the power supply and get these readings.
TP1 - 5V
TP3 - 11.9V
TP4 - -14.6V
CPU board
TP2 - 5V
So the question is why is this not booting up properly when turned on? Would it be worthwhile to rebuild the power supply board? Could this bad RAM? Any ideas?
Thank you

Someone else may chime in, but I’d first rebuild the power supply board especially if it’s never been done

I’d also reflow all of the solder to the pins on the back of the mpu board where power comes in or anywhere else it looks like there may be a cold solder joint.

This is the first thing I’d do if any of my system 11’s started to give me issues like that. Then I’d investigate further into ram Etc after updating

Let me know if you need help Loren

First things to check with any CPU logic driven system is power and clock. Confirm the power is correctly in specification - at the MPU. Check both DC level and AC ripple, these must be spot on and clean. Then check your oscillator frequency with a scope or frequency counter. Pin 39 of the 6808 should be 4 MHZ (the range the IC will operate is from 0.4 to 4MHZ)

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Whirlwind Boot Up Takes Time?

By loren3233

4 years ago

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