Anybody know much about displays?

vipe155

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I have a display problem with both of my machines, and it really bugs me. I've read through the pin repair guide on displays, tested chips and replaced some resistors, but still have something missing on both of them. Someday I'll just replace them with the new LED displays, but at almost $400 for both machines not now.

One is a System 11, with a missing upper right segment. No idea if this can even be fixed.

The other is a System 6 where the ball in play number (digit?) has totally disappeared. I've checked IC4 (master digit driver) and it's good.

The first display is an annoyance, but with the Sys6 game it means nothing shows what ball your on.

http://i397.photobucket.com/albums/pp55/vipe155/IMG_1055.jpg

http://i397.photobucket.com/albums/pp55/vipe155/IMG_1057.jpg

I didn't know much about circuit boards until a couple of months ago, but know nothing about displays.
 
Your system 11 problem is going to probably just be a resistor somewhere in there. Shouldn't be a hard fix at all.

The system 6 I'll have to dig further, may be one of the encoders possibly..... gotta find a diagram. Which part number is on the board? There's a couple different models.

-Hans
 
I've looked at the System 11 diagram, but haven't yet figured out which resistor it might be.

The system 6 is the one with the chips, D-8000.
 
Haven't really looked into the displays for system 11 very much..... and I think I'm totally wrong about it being a resistor. Which System 11 is it anyway? There's some differences in the displays as the design matured. But it looks to be a bad UDN7180 chip.... here's the test sequence from Pinrepair.....

Testing the UDN7180/UDN6118 Chips and Score Glass for Shorts.
Both UDN chips are 18 pin chips. The four corner pins of the chips do *not* need to be tested (pins 1,9,10,18). But all the other pins can be tested. Repeat this test for each of the UDN6118 and UDN7180 chips:

1. Turn the game off.
2. Remove the high voltage power supply power connector (3J5 or 3J2, depending on which power supply the game has).
3. Put the DMM on the *diode* setting.
4. Connect the red DMM lead to ground.
5. Put the black DMM lead on each UDN pin 2 to pin 8.
6. A reading of .5 to .7 should be seen.
7. Put the black DMM lead on each UDN pin 11 to 17.
8. a NULL (no) reading should be seen!


I'll look into the System 6 problem later, getting late and need sleep.
 
I've had the actual glass short internally causing issues like picture #1. It's not common, but it does happen. Only fix is a new piece of glass.....but rule out the other stuff first. That glass is $100...give or take.

Edward
 
Haven't really looked into the displays for system 11 very much..... and I think I'm totally wrong about it being a resistor. Which System 11 is it anyway? There's some differences in the displays as the design matured. But it looks to be a bad UDN7180 chip.... here's the test sequence from Pinrepair.....

Testing the UDN7180/UDN6118 Chips and Score Glass for Shorts.
Both UDN chips are 18 pin chips. The four corner pins of the chips do *not* need to be tested (pins 1,9,10,18). But all the other pins can be tested. Repeat this test for each of the UDN6118 and UDN7180 chips:

1. Turn the game off.
2. Remove the high voltage power supply power connector (3J5 or 3J2, depending on which power supply the game has).
3. Put the DMM on the *diode* setting.
4. Connect the red DMM lead to ground.
5. Put the black DMM lead on each UDN pin 2 to pin 8.
6. A reading of .5 to .7 should be seen.
7. Put the black DMM lead on each UDN pin 11 to 17.
8. a NULL (no) reading should be seen!


I'll look into the System 6 problem later, getting late and need sleep.

The Sys11 one isn't a huge deal, but I'll check the chips out soon and see if that tells anything. Then I'll post those results on here soon. If the glass is shorted, then it's screwed and I won't worry about it.
 
Ok, I remembered that I had thrown in a 6118 type chip in one of my orders way back, and I just went ahead and replaced the master display 6118 that controls the credit/ball-in-play digits on my Sys6.

Unfortunately, it didn't fix it. According to info I've found, the only other thing it should be is the 4069 chip. Anyone know what kind of values I should be getting when I test that chip?

Also, if I need to replace it, is there anyone else that sells these besides Marcos? Marcos shipping is just horrendous; it's like $6 just to ship a little IC chip that should cost a couple of bucks.
 
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