Problem: I go into the lamp test in the test menu and light each lamp one at a
time. When I run the lamp test I see some bulbs will light when they are not supposed to.

Example: The 8x multiplier lights up & so does the extra ball lamp & same thing in reverse extra ball lamp lights & 8x multiplier lamp.
This happens with about 4 different lamps.  

This page might help:

http://www.pinrepair.com/wpc/index2.htm#lamp

Scroll down to "Two Lamps On Instead of One."

Quoted from tinyrodent

This page might help:

http://www.pinrepair.com/wpc/index2.htm#lamp

Scroll down to "Two Lamps On Instead of One."

Thanks for you're help.

Ok this is what I've found, Red-Grn & Red-Blue in the single lamp test all run 2 lights (J135)
Pin 7 red-blue & red-green on pin 6 @ J135.
At this point I've tested all diodes...
So I'm thinking bad transistor, need more help on this one guys.

Diodes can only be tested out of circuit, by desoldering one end. However, transistors can be tested in circuit and that is the next step recommended by pinrepair. In my experience it's not an infallible test but a good place to start. Also in the same section it is described how to determine whether there is a short on the playfield:

Quoted Text

look for a short and/ or bad lamp diode on the playfield. This is easy to test; just remove the lamp matrix plugs from the power driver board (these connections are shown a few paragraphs below). Using the DMM set to ohms, see if the associated row/column wires are shorted to each other on the disconnected lamp matrix plugs (not on the driver board!). If two lines buzz out with zero ohms, there is a short or bad diode on the playfield somewhere.

Yeah I did follow the test for a short it was my first thing I tried, came up ok on the meter.
I also removed each lamp from the chain & it came up with nothing.
If it’s a bad transistor can I not trace the location on the driver board?
The chain that’s bad are using the same wire codes all other wires are fine, I guess what I’m getting at is J135 pin 7 & 6 should be controlled with a transistor location point on the driver board correct?

Yes you can trace from the pin to the transistors but it's easier to look at the manual. The lamp matrix chart tells you the transistor number of each row and column. The transistors can be tested individually as described here:

http://www.pinrepair.com/wpc/index2.htm#trans2

It's also possible there is a short on the driver board between these two pins. Could be messy solder on the header for example.

If the transistors are ok there could be a problem with one of the upstream ICs. I would look at the schematic and test with a logic probe. I don't have a T2 schematic handy, is J135 the row or column connector?

I uploaded, not sure 100% were the correct transistors are...

The first photo might help but it's too small to read. The second photo is just a parts list and doesn't show the connections.

The easiest way to find the transistors is to look at the lamp matrix table rather than the schematics.

There is a (poor) scan of the manual available on ipdb:

http://www.ipdb.org/files/2524/Williams_1991_Terminator_2_Judgment_Day_Manual.pdf

According to this the column header is J138 and the row header is J133. You said the problem has been isolated to J135?
Also the wire colors don't match the pin numbers you mentioned.
So I suggest double check everything and then check it again.

Quoted from tinyrodent

There is a (poor) scan of the manual available on ipdb:

http://www.ipdb.org/files/2524/Williams_1991_Terminator_2_Judgment_Day_Manual.pdf

According to this the column header is J138 and the row header is J133. You said the problem has been isolated to J135?
Also the wire colors don't match the pin numbers you mentioned.
So I suggest double check everything and then check it again.

Yeah I see that, rev is different I guess.
Mine is correct, it has 9 pins not 8, 3rd key is not used.
My column is J138 & uses J135 9 pin.
Transistors test fine...

Hmm that's odd. Anyway I would break out a logic probe next and look at the signals on the board during single lamp test. If you don't have one I'm not sure what else to suggest. Anyone nearby with a spare WPC driver board you can test with?

Quoted from MadIndian

The 8x multiplier lights up & so does the extra ball lamp & same thing in reverse extra ball lamp lights & 8x multiplier lamp.

Looking at the lamp matrix chart, these two lamps don't share either a row or a column.

Quoted from MadIndian

Red-Grn & Red-Blue in the single lamp test all run 2 lights (J135) Pin 7 red-blue & red-green on pin 6 @ J135.

But Extra Ball is supposed to be on Red-Violet.

In cases like this I will go through single lamp test and write the result for each one in the chart. Then it's easier to see any row/column trends.