Hi guys.
Just got a black knight williams 1980.
Its got alot of problems, it was a dumpster pin, i got it for free, really wanna save it. No pinball machine deserves a dumpster!!

Well problem nr one. Look at link.

Lower right flipper flips like crazy. Did clear the leafswitch at right button, did not help.
Where to look next??

Okey. Problem isolated a little.

I have swiched 2cabels, lower left and right flipperciols. STILL right lower flipper flicker as on the video.

Now this tells me, no board problems. No switchleaf problem. I must something with the coil. Am i right??

Aaaaand you are a genius, thank you.
It was middle log that was loose. Little solderjob, and now it flips great.

Thanks

Okey. Problem nr two.

Link to video.

Displayes are dead. I can only see dots. More points scored, the dot moves. Same problem on all displayes.
Where too look now

Is just reseated all gray cabels on displayes. Dident help.

Yes on display test all displayes , , light up only.

This means 100v is present.

Yes dust did reseat all plugs on mpu and power board. Seems like they were never off before.

Can you bee more precise where you mean i should check for 100v??

Okey. Did check. I unplugged it and measured. 5v is right amount.
Both 100v and -100v is 107v/-100v is this okey??

Now i am thinking the problem could bee in the ic's on the displayboard. How doo i check them?

Well my ic18 is solderd.

I replaced one ic called 6808p. My soundboard had the same. Did not help.

So you mean my problem is on this ic on my mou board??

IMG_8792 (resized).PNG

IMG_8793 (resized).JPG

They have been replaced few years ago along with some other parts. Caps the row thats darkred colored.

Only , , on all displayes ☠️

IMG_8799 (resized).PNG

Dont know anything about logicprobe sorry.
My u18 is soldered. Its not calles 6820/6821.

I have an old lord jungle at storage, dont know condition, never checked it. But can i use mpu board from that pinball?

Cool. No need for switching roms?? Will try it this weekend

Okey. So i olny move the left rom and the roght bottom rom. Flipperrom 1 and 2 is the same??
Thanks for reallt nice info

Recieved pic of my junglelord. (Its on storage) bought unseen.

Look at this pic!!!!

Seller told me it played fine. Hmmmmm looks pretty hacked. Look at the battery!!!!

Shitty seller!

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And burned connectors at psu board.

Another question. Just turned my BK on. Started new game. Ball pops up, dropdowntargets gets pushed up, but all four flippers are dead. Turned off and on. Still the same. Does flippers have there own fuse somewhere?

Okey. At label it says flipperciols. That fuse is not blown. Black inside. Looks allmost blown but its not. 16 amp.

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Okey i pushed leafs for magnets and now all flippers works percekt

Wierd but nice

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Okey GREAT PROGRES ON DISPLAYS.
Look at picture. When i really gentley toutch those two ICs displays works. They flicker. When i press down both ICs all displayes works great.

I just resoldered ICs bus that dident help. Now i will try resolder topside on ics

IMG_8823 (resized).JPG

Hmmmm solder did not help.
Now i have to gentley toutch both ics and i works. When i let go my finger all numbers goes off again.

Update. When i toutch lower right ic numbers appear again. Some only blinking numbers and sometime solid. Have not soldered this last ic. Will look at it tomorrow. Allmost midnight in Denmark.

Anyone tryed this before??

Where does it get ground from?? Its screwed on with 4 bolts but cant see any groundattecment to the board anywhere.
Its got plastic holders/spacers at the back

Its so strange, when i toutch lower right is gentle, not press but just toutch with a finger, let finger gentle up and down all displayes work, if i keep on up and down displayes work, when i remouve me finger displayes goo out again after few secounds.

What is this?? Is all ics up to bee replaced?? Resolder did not help.

Yes hes and yes. Only way displayes work is when i gentlly put my finger on lower right ic.
So wierd