Apple IIe random vertical lines and no beep

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GuidoAnchovy's picture
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Apple IIe random vertical lines and no beep

Hi!  I recently got an Enhanced IIe from someone who was getting rid of it and I've been trying to coax it back to life.  I have had a II+ for years and, except for a power supply failure, it's been rock solid.

 

Anyway. the IIe had a blown power supply, so I tempoararily swapped in good (ReActiveMicro) one from my old Apple II+.  On first powerup I get a blank screen with no beep.  Turn it off and back on and I get random vertical lines.  I say random because I can turn it off and on again and get another variation on those lines.  Here's a picture:

 

Here is what I have tried so far:

1. Pulled 65C02 (338-6503) out of IIe and installed in II+.  The CPU works in the II+

2. Swapped the DM74S02N at B8 with a new SN64S02N

3. Swapped the 74F109PC at C1 with a new SN74109N

4. Swapped the 74LS125APC at E1 with a new SN74LS125AN

5 Tried pulling CPU totally and seeing what happens.  Still get the same random vertical lines!

 

Any ideas as to what's going on?  I'm baffled!

 

Here's a picture of the board:

 

Bad-Apple's picture
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Leave the machine on for 5 minutes or so and then feel the top of each IC. If any of them are much hotter than the rest - replace.

I had a case where I had to swap out the  SN74LS245N  (LS245) to fix the vertical lines issue.  I note it is also present on your board in position B2.

 

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Thanks for the tip!  I

Thanks for the tip!  I happened to have a spare LS245 to swap in and it's doing the same thing, sadly.  Hopefully that LS245 isn't bad as well.

 

 I let it run for a while and nothing really stood out heat wise other than that LS245 and it wasn't uncomfortably warm.

 

I am able to check and verify the video rom with a chip programmer, but I can't check the CD and EF roms as I don't think it can read those types of chips.

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Apple IIe random vertical lines and no beep

Could be worthwhile to take the 6502 from your II+ and give it a spin in the IIe ?

Otherwise - might be worth getting an IIe enhancement kit -these are not too expensive and usually ship with all the ROMS and a new CPU. I ordered a kit from Ebay (in Europe) or Reactive Micro might be an option in the US:  https://www.reactivemicro.com/product/iie-enhancement-kit/

Keep us posted - if you solve the puzzle, I'm sure it will be useful to others in the community.

 

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Last idea - try and chip swap

Last idea - try and chip swap the RAM. Usually the RAM from an 80 column card can be use don the board. I see yours is socketed so should not be too much of a hassle.

RAM kits available on Ebay as well - there are a few variants that are compatible.

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Ok, just tried swapping in

Ok, just tried swapping in some M3764-15RS for the M6665a RAM chips on the board.  I did get a different output: solid, evenly spaced white bars.  They never randomized.

 

(ignore the pink color in the bottom right, the refresh rate was messing with the camera)

 

I also tried swapping out the 6502 from the II+ to no effect.

With or without the CPU and with the swapped RAM I got that display.

I put the old RAM back in and I'm back to the randomly generated bars.

 

I guess it would be worth it to pick up the enhancement kit roms, if nothing else, and see what happens!

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