G05-801 in Lunar Lander looking weird...

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First run of my recently acquired Lunar Lander cab (RAAARREEEEE on mainland Europe :))

I bought a working LL PCB from Archer McLean and put it in the machine and this is the result:



First of all: the board seems to be running OK !

The picture is a little small vertically. Maybe able to adjust that out with the PCB pots.
But the picture looks pretty weird.....looks like it'll need adjustment of the linearity pots right ?
 
No-one seen this effect before ?

I tried my 100% working Asteroids board and it had similar defects on screen so it is definitely a problem in the monitor. (I've tested that Asteroids board on my spare -802 and runs great on it).
 
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