Bikerbob Posted November 1, 2019 Share Posted November 1, 2019 So last month I was getting my 1088xel working from the build, and I had an issue here and there, so I used bits from my 800xl - with u1mb, UAV. Last night I wanted to loan it to a friend because he has a Soldered 800xl (Taiwan) board that we will have to yank out 3 chips to put in the above items. Went to turn it on.. power light on keyboard.. but nothing else.. NOTHING.. not a flash on the screen .. garbled anything.. nothing. So subbed out the U1mb. no Subbed out the UAV nothing. I would love some suggestions. Power is getting to the board.. the keyboard pwr light is on. I guess I will now use the 1088xel to sub out major chips into this one.. see if I broke something.. I put it away working fine.. sitting on a shelf.. something broke. James Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted November 1, 2019 Share Posted November 1, 2019 First of all, hopefully your power supply is not an Ingot. Verify it's putting out 5.0V, plus or minus .2 volts or so Do you hear a click when pressing reset? (Yes = OS ROM likely good) Which bits (3 chips?) did you use in your 1088XEL? If you put them back in the 1088XEL are they still functional? Then test the remaining main IC's from this bad machine one at a time in a known good machine. But it sounds like the remaining "good" machine is your friend's non-socketed one. 1 Quote Link to comment Share on other sites More sharing options...
Bikerbob Posted November 1, 2019 Author Share Posted November 1, 2019 power supplies - 2 different used.. checked on 3 machines, so thats good. No click.. no nothing.. So when I built my 1088xel I was having some issues (in the build thread) So to rule out things.. I subbed some of the main chips with this machine because well both are socketed. GTIA - CPU.. U1MB even UAV.. When this machine went back together - it was tested all seemed good.. screws back in the case.. on to the shelf. First time out last night.. nothing. I am going to boot the 1088xel up again (not had a chance yet) - if thats all good.. then I will change out the GTIA first.. because I think NO video signal at all has got to be related. See where that gets me. James Quote Link to comment Share on other sites More sharing options...
Urchlay Posted November 2, 2019 Share Posted November 2, 2019 > NO video signal at all Is there audio? Without a drive attached, do you hear the SIO polling "fart" noise? If you hold down Start, do you get the cassette boot buzzer? Quote Link to comment Share on other sites More sharing options...
Madi Posted November 2, 2019 Share Posted November 2, 2019 I am sure you have checked that the the video cable is connected to TV/monitor and tested with another device. Actually, it happened to me once ? Check monitor jack for broken traces. Use the generic RC connector with (Ch2 -3). Press START while turning the computer (cassette sound?) If there is no sign of life or even a blink after that, then it is a mystery to me since you had already tried the U1MB and UV boards. Good luck madi 1 Quote Link to comment Share on other sites More sharing options...
Bikerbob Posted November 2, 2019 Author Share Posted November 2, 2019 (edited) 6 hours ago, Urchlay said: > NO video signal at all Is there audio? Without a drive attached, do you hear the SIO polling "fart" noise? If you hold down Start, do you get the cassette boot buzzer? no.. there was not sound. - I did not try the Start buzzer.. I will see.. but not hopeful. Edited November 2, 2019 by Bikerbob Quote Link to comment Share on other sites More sharing options...
Bikerbob Posted November 2, 2019 Author Share Posted November 2, 2019 3 hours ago, Madi said: I am sure you have checked that the the video cable is connected to TV/monitor and tested with another device. Actually, it happened to me once ? Check monitor jack for broken traces. Use the generic RC connector with (Ch2 -3). Press START while turning the computer (cassette sound?) If there is no sign of life or even a blink after that, then it is a mystery to me since you had already tried the U1MB and UV boards. Good luck madi Thanks for the luck madi, looks like I am going to need it. GTIA was not the issue.. that was swapped out for the known good one in the 1088xel. James Quote Link to comment Share on other sites More sharing options...
Bikerbob Posted November 2, 2019 Author Share Posted November 2, 2019 time for the service manual and the schematic I guess. James Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted November 2, 2019 Share Posted November 2, 2019 44 minutes ago, Bikerbob said: GTIA was not the issue.. that was swapped out for the known good one in the 1088xel. Your testing should involve placing IC's 1 at a time from the bad machine into the good machine, not the other way around. Less risk of the bad machine killing known good IC's... 1 Quote Link to comment Share on other sites More sharing options...
CommodoreDecker Posted November 2, 2019 Share Posted November 2, 2019 On 11/1/2019 at 8:10 AM, Nezgar said: First of all, hopefully your power supply is not an Ingot. Verify it's putting out 5.0V, plus or minus .2 volts or so Do you hear a click when pressing reset? (Yes = OS ROM likely good) Which bits (3 chips?) did you use in your 1088XEL? If you put them back in the 1088XEL are they still functional? Then test the remaining main IC's from this bad machine one at a time in a known good machine. But it sounds like the remaining "good" machine is your friend's non-socketed one. I found the PSU list/naming conventions: Now I wish I hadn't sold my XL with the white brick. The top-center is the dreaded ingot of doom. (I do have an Ingot. Ugh... either way, they should all be replaced by those USB adapter cables with 1.5A AC adapter anyway... none of these 30 year old PSUs is going to last forver...) Quote Link to comment Share on other sites More sharing options...
Bikerbob Posted November 3, 2019 Author Share Posted November 3, 2019 not sure what it was, but I reseated EVERYTHING.. I checked all connections were not touching other things etc... and it fired up again.. SO .. YEAH! thanks for those who made suggestions. James 3 Quote Link to comment Share on other sites More sharing options...
+Stephen Posted November 3, 2019 Share Posted November 3, 2019 "Shitty socket syndrome". 3 Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted November 3, 2019 Share Posted November 3, 2019 (edited) 37 minutes ago, Stephen said: "Shitty socket syndrome". Absolutely what Stephen said. I wouldn’t suggest messing around with things any further but the next time it won’t boot (and there will likely be some day in a future month or year down the line), remove each chip and look very closely at the wipes for each socket under bright light and magnification. I would bet that at least some of those socket wipes are losing spring tension or show signs of corrosion. Edited November 3, 2019 by DrVenkman Typo 1 Quote Link to comment Share on other sites More sharing options...
Sugarland Posted November 3, 2019 Share Posted November 3, 2019 I think deoxit will clean and help prevent further corrosion. Quote Link to comment Share on other sites More sharing options...
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