flashbackmatt Posted May 28, 2017 Share Posted May 28, 2017 I bought a XEGS (console only) that only shows a black screen, both using composite and RF. I tested it with a good power supply from my 800XL and a working Joust cartridge. Nothing looks obviously damaged/burnt on the board. Any suggestions on where to start? Quote Link to comment Share on other sites More sharing options...
Paul Westphal Posted May 28, 2017 Share Posted May 28, 2017 Check the RAM. If it says " MT" replace immediately, but it's probably already out. Lower left side of board, two chips. Be careful, the traces are VERY easy to pull up because the mobo is so cheap. I use a $269 Hakko and it is still sketchy. 2 Quote Link to comment Share on other sites More sharing options...
jaybird3rd Posted May 28, 2017 Share Posted May 28, 2017 The last time I had an XEGS with this problem, it turned out to be bad RAM and a bad CPU. I think the machine had been used with the wrong power supply. 2 Quote Link to comment Share on other sites More sharing options...
flashbackmatt Posted May 29, 2017 Author Share Posted May 29, 2017 The last time I had an XEGS with this problem, it turned out to be bad RAM and a bad CPU. I think the machine had been used with the wrong power supply. Thanks! I'll get replacement RAM and some sockets. The CPU is not a standard 6502, right? I would need a replacement from another 8-bit? Quote Link to comment Share on other sites More sharing options...
jaybird3rd Posted May 29, 2017 Share Posted May 29, 2017 Thanks! I'll get replacement RAM and some sockets. The CPU is not a standard 6502, right? I would need a replacement from another 8-bit? The "Sally" 6502 variant used in the Atari computers is slightly different from a standard 6502. Hopefully you won't need one, but if you do, they're not hard to find; B&C ComputerVisions sells them for $5 $8 each. Quote Link to comment Share on other sites More sharing options...
flashbackmatt Posted May 29, 2017 Author Share Posted May 29, 2017 The "Sally" 6502 variant used in the Atari computers is slightly different from a standard 6502. Hopefully you won't need one, but if you do, they're not hard to find; B&C ComputerVisions sells them for $5 each. ICG004 RAM 256K 150NS (SET OF 8)41256 25.00 ICA377 800 CPU 6502 5.00 Thanks again. Those are the RAM and CPU that will work in the XEGS? Quote Link to comment Share on other sites More sharing options...
jaybird3rd Posted May 29, 2017 Share Posted May 29, 2017 I might have been mistaken ... the CPU you quoted is the original Atari 800 CPU, which (IIRC) is a standard 6502. The CPU used in the XL and XE machines (the "Sally") is $8 instead of $5. Also, the RAM you quoted is 1-bit DRAM, the type used in the 800XL, while the XEGS uses 4-bit DRAM (that's why it only has two RAM chips instead of eight). I believe these are the correct parts: ICG464 RAM 41464 4X64K DRAM 5.00 ICA806 XL CPU 8.00 (Of course, you'll want to contact them and find out for sure. Best Electronics is another source that should have what you need.) 1 Quote Link to comment Share on other sites More sharing options...
Rybags Posted May 29, 2017 Share Posted May 29, 2017 They're the right items, the Ram looks a bit pricey if that's per chip. I've got probably 20 spare of that type, old ISA graphics cards are a great source though you barely see that old stuff around now. 3 Quote Link to comment Share on other sites More sharing options...
flashbackmatt Posted November 7, 2017 Author Share Posted November 7, 2017 So. I finally got around to socketing and replacing the RAM, but I cracked C20 in the process. I assumed it is a filter cap, so not critical. Still black screen. I have a replacement CPU, but I'm not certain which 40-pin DIP is the CPU. Can anyone tell me the specs on C20 and which chip is the CPU? Quote Link to comment Share on other sites More sharing options...
Level42 Posted November 7, 2017 Share Posted November 7, 2017 (edited) U5 C014806 is Sally Edited November 7, 2017 by Level42 1 Quote Link to comment Share on other sites More sharing options...
Roydea6 Posted November 7, 2017 Share Posted November 7, 2017 @ flashbackmatt Have you tried to boot without the CART Joust installed in the Cart slot.?? Quote Link to comment Share on other sites More sharing options...
flashbackmatt Posted November 10, 2017 Author Share Posted November 10, 2017 @ flashbackmatt Have you tried to boot without the CART Joust installed in the Cart slot.?? Yes. I have tried without cartridge, just a blank screen. Quote Link to comment Share on other sites More sharing options...
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