Hey everyone. just seeing if anyone else has had this before .

WPC-95, no boot,201 led locked on , 202 out, 203 on, no acid damage, good cpu, nvram, rom verified, address and data lines good across the 3 ,good clock signals, good power supply. [its on the bench] clock signals good, asic socket good.

The cpu pin3 irq is low pulsing not high like it should be, with 201 blanking led on steady ,the U21 pin 3 is low so blanking circuit is fine
The reset signal should be 5v /steady high with the logic probe but it sounds like its pulsing super fast many times a second. Almost sounds fine its pulsing so fast. But when compared to a proper signal from working board the difference is clear.

Game all of a sudden would not boot up and this is what was found. Thoughts? This could be a spanker with no scope and a couple other special tools.

Thanks Chris.
I do not have a spare asic or I would have swapped it out. I reseated it to no avail. Time to find an extra I think.

any other ideas? Looking for spare asic. Seems these rarely fail. Thoughts?

i'd like to but I hate doing that. Much rather find a spare board to rob parts from or have extra ic's around. I would hate myself if a socket gave out or a leg broke just cause I was testing another game.
Reg socket fine no sweat but these asic sockets are something else.
Anyone have a spare ASIC or an entire wpc 95 cpu board around?
Be so nice to have a working spare .

Thanks Ed. Great idea! Pulled asic and checked legs. All look nice and same bow on all sides. Clicked in nicely but no worky. Sigh.
Any other ideas? Thanks for your input everyone. Here is hoping its something stupid. And not the asic. lol

Its a MM and the board looks perfect. Just like new. No acid damage or anything. Battery box is cut off and nvram installed. Worked great and then went to turn it on and nothing. Just GI.

What other than the asic could cause this? Considering everyhting I posted so far?

Board is on the bench. Eliminating anything on the game at fault. Game was/is otherwise perfect. Just stopped booting

Thanks for the posts!Appreciate any input. Again board is on the bench.Not in the game . No ribbon cables attached. Nothing attached but ground,5 and 12 volts and a logic probe. lol
Nothing to pull this down other than components on the board itself.

No sweat. I was just saying what happens when the game is powered on with the board installed in the game itself.

And that now its on the bench to omit anything with the game being at fault for stopping the board from booting No problem. Appreciate the posts either way. Cheers!

And thanks pinballemporium I did check the nvram traces first thing I did and all data and address lines are good. But will check again to make sure. Maybe I missed one the first check.

double checked the traces from nvram to all devices, rom, cpu and asic chips all legs buzz where they should.

going to double check and meter out the factory rom socket and the cpu socket as well.

double checked..still no goodness. sigh.

Yup still not working. Been trying to get a good picture but my camera sucks so bad.

Whoops I meant to say rom not ram,edited above. Already put nvram in the factory ram spot with machine pin socket strips.Triple checked for continuity.

So far I have tried new known good cpu chip and regular ram, verified the eprom and its good and re-seated the asic. Hmm what else..pin checked the 4 main chips to one another. [rom ram cpu asic]
Good power, clock signals and reset signal starts low and goes high as it should but blanking lamp is lit and u21 pin 3 is low .

pins on the asic look very nice and shiny silver and clean with the same uniform 'bow' all around the chip. Asic socket is nice also. Looks new, no cracks or breaks. Gone over the board with glasses and magnifying glass to look for bad solders etc.

And yes pinballmaniac you are correct . Have not shotgun replaced anything. Just what I listed above, I do not have a scope so testing this kind of an issue can be tough to impossible. Might be time to seek out a nice fluke and more toys. lol

Or maybe I can see if someone had this particular issue before and what the final resolution was. Or get help from someone with better tools than myself

I did check every pin for shorts on the cpu,rom and ram ic's and continuity to all the asic,cpu,rom and ram. No shorts and all have good connection.
Issue started long after nvram was installed. As in game worked for a long time before the issue cropped up.

by check for shorts I did the ol meter each pin and rake the others to all legs. Rom ram and cpu all got this done.

I will try it for sure. Tomorrow is another day thanks for the posts guys

well i set the board outside in the -5 weather for a couple hours and tried to fire it and no go. Was hoping being cold would help and I could have tried the freeze spray to isolate the offending part. No luck.

Gonna set it by my fireplace and warm it all up and hope we get joy. If it works, after it cools I will grab a heat gun and start searching
After the cold trick I am doubtful though. Prolly a failure of a component I need a scope to verify.Crap.

Seems to be my luck to get board spankers from time to time. lol

Can't ever be the easy stuff . lol Meh makes life interesting I guess.

not all night lol warm it all RIGHT up. Edited above so it reads better. Just placed it there gonna let it get good and warm and should tell the tale. Will not take long.

no luck yet. Hoping someone will chime in that has had the same problem . Seems to be not that common which is good as there is not a lot out there by way of posts or articles for this particular issue.
Hmm wish I had a scope and other wicked testing tools!

bump for monday crowd. Any more ideas my friends?
Cheers

Thanks man. BUT game ran fine before it quit. Nvram was installed months before game stopped working. Thanks for your idea though! Very much appreciated. Anyone else have a idea for me? Sigh missing my MM
Cheers

any other ideas friends?
Cheers

ha ha. Rather do it myself if at all possible. BUT limited in the tools I have. I need a scope and 6809 pod and more. sigh.
DMM and logic probe only get you so far.

I know a legendary tech but he is super busy and has no time right now.

When I eventually find the reason this will not boot I will post the answer.

OK fixed. Found a weak trace at A13 between cpu and asic. Was making a connection but not good enough of one. Trace cracked. Would have been easier to find with a scope.
Noticed slightly weaker signal at cpu then at the asic. Measure resistance and bingo! Ran jumper from through hole to leg of cpu and its perfect now. All solders were and are good,so it for sure is/was a minute cracked trace.
Posting for future help for others.
Cheers!!