ndary Posted June 24, 2016 Share Posted June 24, 2016 i had a working NTSC 800XL that was going to upgrade with the Antonia 4M upgrade i received yesterday.. The computer was tested before i opened it and removed the RF shield, luckily all IC's are not sockets. followed the instructions and removed U8 - 6502 processor, Removed U3 - MMU and U29, made a short jumper on pin 6,7 of U29 and mounted the 4M upgrade PCD,,, The Atari booted to SelfTest showing ROM error.. i restored the original IC's and the 800XL does not boot anyore.. i only get to a Back screen on my monitor. i was thinking that it something to do with contacts so i re soldered thse 3 ics; i also tried to replace them from another computer but the problem remains.. finally i installed the Antonia 4MB on another 800XL (pal) and it works fine.. I am trying to recover the NTSC 800XL, does any one dealt with a case where the ATARI 800XL does not output video and can provide tips what should i check? Thanks you Quote Link to comment Share on other sites More sharing options...
Bikerbob Posted June 24, 2016 Share Posted June 24, 2016 i had a working NTSC 800XL that was going to upgrade with the Antonia 4M upgrade i received yesterday.. The computer was tested before i opened it and removed the RF shield, luckily all IC's are not sockets. followed the instructions and removed U8 - 6502 processor, Removed U3 - MMU and U29, made a short jumper on pin 6,7 of U29 and mounted the 4M upgrade PCD,,, The Atari booted to SelfTest showing ROM error.. i restored the original IC's and the 800XL does not boot anyore.. i only get to a Back screen on my monitor. i was thinking that it something to do with contacts so i re soldered thse 3 ics; i also tried to replace them from another computer but the problem remains.. finally i installed the Antonia 4MB on another 800XL (pal) and it works fine.. First, just asking.. english is your 2nd language? because you started by saying luckily all IC's are not sockets??? and then show us a pic of a socketed board.. but you later say you re-soldered the ICs back.. again... I see no soldered chips on the picture of the board?? James Quote Link to comment Share on other sites More sharing options...
ndary Posted June 24, 2016 Author Share Posted June 24, 2016 You are correct i made an error in my description... I meant that i was lucky that all IC's were on sockets.. And i resoldered the sockets again in case it was a bad connection problem Nir Quote Link to comment Share on other sites More sharing options...
Bikerbob Posted June 24, 2016 Share Posted June 24, 2016 ahh.. OK, this may sound stupid.. sorry.. but did you also remove the jumper you made? Check around where you made that jumper.. with a magnifing glass.. any chance you shorted something there?? that by the sounds of it was the only solder point you made after it was working previously? Have you used the service manual troubleshooting steps yet? http://www.atarimania.com/documents/atari_800XL_Field_Service_manual.pdf James Quote Link to comment Share on other sites More sharing options...
jefffulton Posted March 28, 2019 Share Posted March 28, 2019 (edited) Hey Nir, I know this is old, but it is the same problem I am having. You seemed to have fix it. Nir what did you use to make the jumper on pin 6 and 7 Edited March 28, 2019 by jefffulton Quote Link to comment Share on other sites More sharing options...
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