Author Topic: Wpc 89 board Display Corruption..  (Read 875 times)

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Offline TUF-427

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Re: Wpc 89 board Display Corruption..
« Reply #15 on: February 20, 2014, 09:27:17 PM »
Or my Iphone was <.>
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Offline Marty Machine

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Re: Wpc 89 board Display Corruption..
« Reply #16 on: February 20, 2014, 11:00:18 PM »
Problem solved - your machine is upside down - didn't you realise that????  %.%
He mounted it on the ceiling so the water would flow down better  :lol :lol :lol :lol

Offline TUF-427

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Re: Wpc 89 board Display Corruption..
« Reply #17 on: February 21, 2014, 07:57:15 AM »
Problem solved - your machine is upside down - didn't you realise that????  %.%
He mounted it on the ceiling so the water would flow down better  :lol :lol :lol :lol

Thanks for the informative,on topic replys... ^^^
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Offline johnwartjr

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Re: Wpc 89 board Display Corruption..
« Reply #18 on: March 15, 2014, 06:57:05 AM »
Run the display test. I see this from time to time, and it's often the 6264 RAM on the DMD controller. Cheap and easy fix! The display test will report the errors.

Offline Strangeways

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Re: Wpc 89 board Display Corruption..
« Reply #19 on: March 15, 2014, 09:05:09 AM »
Run the display test. I see this from time to time, and it's often the 6264 RAM on the DMD controller. Cheap and easy fix! The display test will report the errors.

+1

Even re seat the RAM chip and look for any bent pins which can happen when you swap ICs from board to board.
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Offline TUF-427

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Re: Wpc 89 board Display Corruption..
« Reply #20 on: March 19, 2014, 08:10:19 AM »
Run the display test. I see this from time to time, and it's often the 6264 RAM on the DMD controller. Cheap and easy fix! The display test will report the errors.

+1

Even re seat the RAM chip and look for any bent pins which can happen when you swap ICs from board to board.

Cheers guys,
I have run the display test and it reports Ram address errors.
This is unclear as to weather this is the 6264 on the CPU or on the display driver board,
But by being able to carry the fault across machines by swapping the Mpu board leads me to believe its that board.
Alas williams decided it was best to solder the 6264 directly to both boards so not able to swap easily..
Will have to be cut off and socketed with dip28s

Can you substitute a different speed 6264 to the original?
I think the original chip is 150ns and most available now are 70ns..
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Offline Homepin

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Re: Wpc 89 board Display Corruption..
« Reply #21 on: March 19, 2014, 09:44:39 AM »
Faster chip speeds are fine - slower is not
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Offline TUF-427

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Re: Wpc 89 board Display Corruption..
« Reply #22 on: March 19, 2014, 11:57:43 AM »
Faster chip speeds are fine - slower is not

Cheers for that I'd suspected that would be the case but wasn't 100% sure..
Also can get them with a broad operating voltage and some just at nominal 5v..
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Offline Caveoftreasures

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Re: Wpc 89 board Display Corruption..
« Reply #23 on: March 19, 2014, 05:48:33 PM »
a dumb question.

does the factory manual have a simple trouble shooting section with that error on there with the manufacturers answer as to what it is/needs replacing ?
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Offline studley67

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Re: Wpc 89 board Display Corruption..
« Reply #24 on: March 19, 2014, 05:57:33 PM »
if you replace the mpu ram chip.be extra cautious.the tracks and pads are very fine and easily damaged.I have a military soldering background and screwed one up from my "jackbot",hence a new mpu.
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Offline TUF-427

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Re: Wpc 89 board Display Corruption..
« Reply #25 on: March 19, 2014, 08:17:41 PM »
a dumb question.

does the factory manual have a simple trouble shooting section with that error on there with the manufacturers answer as to what it is/needs replacing ?

That would be nice but doesn't exist in Wpc manuals I've seen.

Maybe williams had something more substantial for Wpc series..

I'm guessing for operators and repair techs it was a case of replacing boards to keep the machines making money and hardcore repairs on the boards were done back in the workshops..
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Offline TUF-427

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Re: Wpc 89 board Display Corruption..
« Reply #26 on: March 19, 2014, 08:23:35 PM »
if you replace the mpu ram chip.be extra cautious.the tracks and pads are very fine and easily damaged.I have a military soldering background and screwed one up from my "jackbot",hence a new mpu.

Yes not really looking forward to changing it and have been leaving it as the last resort ,
Pretty  well changed everything else related to display operation  I think..
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Offline beaky

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Re: Wpc 89 board Display Corruption..
« Reply #27 on: March 19, 2014, 09:18:03 PM »
so when you put a substitute mpu board in your machine and you do a display test you dont get an error in display test.
and you put the suspect mpu board in a different machine and do the display test you get the error in the different machine?
if this is the case then the fault has to be on the mpu board.

before replacing the ram chip on the mpu board if you haven't done so already i would be beeping out all the address and data lines between U1, 2, 3 and the cpu chip.
I would find it strange that you would have only a display fault if you had a faulty ram chip on the mpu board, i would expect lamp, switch , solenoid and flasher problems as well.
but anything is possible
 
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Offline Caveoftreasures

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Re: Wpc 89 board Display Corruption..
« Reply #28 on: March 19, 2014, 09:38:50 PM »
what happens wen u put a proven/other dmd display in the machine, same error as the orig white water dmd's message ?
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Offline TUF-427

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Re: Wpc 89 board Display Corruption..
« Reply #29 on: March 19, 2014, 11:51:46 PM »
so when you put a substitute mpu board in your machine and you do a display test you dont get an error in display test.
and you put the suspect mpu board in a different machine and do the display test you get the error in the different machine?
if this is the case then the fault has to be on the mpu board.

Yep this is the case..... ^.^

before replacing the ram chip on the mpu board if you haven't done so already i would be beeping out all the address and data lines between U1, 2, 3 and the cpu chip.
I would find it strange that you would have only a display fault if you had a faulty ram chip on the mpu board, i would expect lamp, switch , solenoid and flasher problems as well.
but anything is possible

I've previously socketed U1-2-3 and ensured all pins went to where they were supposed to.
Also had a Cro on all the data and address lines and seem to have activity on all..
Weather it's correct is beyond my testing ability..
It has had the odd random coil fire and flipper flutter in WW with this Mpu board installed..
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