Asteroids help!!

Rhm

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Turned on and this is what I found. Tried reseating all roms and checked all connection. Has Anyone had this problem or know how to fix? the screen
displays on half the screen. Like thats all the bigger picture is? Help
 

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Maybe you should look to the monitor... that looks like collapse to me. Have you recapped your monitor and replace the transistors? There is also the common problem of the header pins having cold solder joints. If you have no caps or transistors on hand I'd recommend doing this first. Reflow the solder on those pins and see what happens. The header pins are the underside of the connecters that the wire harnesses plug into, on the monitor PCBs.
 
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I would second the vote for bad Transistors . I had the same problem except I lost the top half of the screen. Did a cap kit including replacing the Transistors and it fixed the problem.
 
So just order a cap kit? Does it come with transistors. Who to get from? Bob Roberts?
 
I would second the vote for bad Transistors . I had the same problem except I lost the top half of the screen. Did a cap kit including replacing the Transistors and it fixed the problem.

i always (incorrectly) assume everyone has recently capped their monitor; definitely would look at those transistors if you haven't done them recently.
 
So just order a cap kit? Does it come with transistors. Who to get from? Bob Roberts?

Yup, Bob Roberts. He lists the cap kits for these monitors as w/ xsisters and without xsisters. You want with. In my experience he defaults to the with if unspecified, but better safe then sorry.
 
I just bought it less than a month ago, so don't know back ground. But probably not.
Should I just do both while I'm at it? Where's best place to get parts? What all should I get?
 
Is there different monitors or just order for asteroids ?

You need to verify your monitor to be sure. Open the back of the cabinet and look for s sticker on the monitor. You probably have an Electrohome G05 19 inch monitor. You need to verify this.

Here's the part # from Bob for the G05-802

GO5-802 19" B&W X-Y w xsistors ..........$12.00

Here is the cap kit page.

http://www.therealbobroberts.net/caps.html

He only takes money orders though. You email him with the parts you need and then he gives you a total. Send the money order right away because he usually ships as soon as you confirm the order. He ships priority in flat rate boxes, so shipping is like $8.
 
I'd say:
50% chance it's bad connections (either the header pins or the transistor socket)
40% chance it's a bad transistor. Q708 specifically, as it's +X deflection you're lacking.
10% chance it's the game PCB.
0% chance it's bad caps in the monitor, but you can replace them if you want to.
 
So if I do cap kit w resistors I have 40% chance to fix, reflow header pins I'm at 90%. and if that don't fix then might be pcb?
 
So if I do cap kit w resistors I have 40% chance to fix, reflow header pins I'm at 90%. and if that don't fix then might be pcb?

...transistors, not resistors.

And I highly recommend first checking, or just re-soldering, the headers on the monitor deflection PCB. Esp the ones where the connections to the frame-mounted transistors are. Doing this is free (if you have soldering equipment) and doesn't involve waiting for mail from Gretna, LA. While you're doing that, if you have a DMM you could test the frame-mounted ("bottle cap") transistors. Even if you don't have a DMM, can can swap the pairs of the same type (2N3716 & 2N3792) with each other, and see if the problem changes to the vertical axis... if so, you know it's a bad xistor.
 
I'm not that good with this stuff. How much would you charge me to do this and install cap kit w xsistors? Basically help fix.
 
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