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palindrome

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Everything posted by palindrome

  1. Here's a positive update. There was no HV whatsoever, so that section of the flyback had failed which was evident in the photos, replaced the flyback with 1-439-526-11. All it needs now is an gain adjustment for all 3 guns, especially red. I'll read through the manual later tonight. I'll recap the power board as a precaution when I can afford it. Some info that might help others repair their PVM. Original part 1--439-526-12 Substitute parts for this flyback are confirmed at the link below. ( 1-439-526-11 and 1-439-526-13 ) These work in the 9" and 8" models. https://sony.encompass.com/item/6080023/Sony/1-439-526-12/
  2. I would assume so based on these images. So HV isn't connected but I'd assume the Flyback is probably no good, however the tube appears to be generated some static on the face of it. Heaters are not open and voltages are present there. So not sure where to go from here, or whether to take my chances on replacing the FBT
  3. Heaters are fine. There’s resistance between h1 / h2 and ground. Think I found the problem, wonder if I can find a new flyback for this Edit: cleaned up the black soot, looks like the pin isn’t even connected anymore, confirmed not connected to hv trace with DMM.
  4. So I checked the filament voltage, which should be 120v going in according to the service manual and it's definitely there. So either, the heaters are gone or there's a problem on the neck board..
  5. I haven't measured anything yet or checked for an open on the neck tube. I've been occupied going through the service manual to get more familiar with its internals. I'm hoping the tube hasn't failed because there's no way I can replace the glass. Hopefully it's just a problem with the high voltage, will measure the B+ voltage tomorrow but I suspect it's not what it should be or not present at all ( ~40v according to the manual ).
  6. Hey all, looking for some advice to see my PVM is repairable. Initially thought there was a problem with the cable I built for the video input but trying several computers proved the issue was with the monitor. So there's neck glow at all, the green LED comes on, audio inputs work OK. Obviously no video. Tube feels like its charging and I can feel static on the face of the tube. I have no experience repairing PVMs. Would this be a dead flyback or a bad power supply ?
  7. Awesome work and research. Yeah I knew it, the B+ was virtually 0 volts with that EHT installed, that can’t be good for the power supply either. Connecting a dummy load ( 240v globe ) with the EHT removed confirmed it for me but this is more confirmation. One of the last things I’d like to confirm is if my original IOU is indeed faulty. Still looking around for a replacement. Since you have a IIc motherboard, the IOU in it should be socketed as well as most of the other main chips. I could loan it to you for you to test in the IIc.
  8. I don't have the monitor anymore but I still have the original flyback. Not sure if it's much use to you.
  9. No. Never got mine working. It's virtually impossible to find any reliable info on the above Flyback. The chassis is Hitatchi. The Flyback was also used in the A2M2056 which is discontinued, there's an ASTI replacement as well which is also discontinued. https://encompass.com/item/203860/Hitachi/2434742/ I got my EHT from ebay. The fcc 1415-XL I believe was the recommended part wasn't it ? . But it's either not the correct one or mine was faulty or something else is wrong with the monitor.
  10. Open to that possibility. But in hindsight I did have the exact same issue with my previous IIe enhanced as well. In fact I do on some occasions get an IOU error "IOU FLAG ES: 1" but most likely this is normal behaviour after running programs and trying to run the self-test. I found 4 bad DRAMs this afternoon and replaced them with the pulls I had lying around. It's nice to have a second working board ready to go if I need it.
  11. So I received the PCB yesterday and swapped over the IOU and have colour. The colours are so vibrant and alive on my pvm. Thankfully the IOU is working but the replacement non tested board ( Apple IIe non enhanced ) it came from has some bad 4164s which I'll get around to fixing later, some of the original Microns have been replaced already so that's a good clue. Not sure what final conclusions to draw from this other than most monitors being super picky about video as already mentioned. But if swapping the crystal doesn't give you colour then it's worth swapping the IOU over as well.
  12. I have working 4264 Micron pulls. If you need any spares for troubleshooting let me know but I wouldn’t recommend using them indefinitely. The built in self test is very good. I used it exclusively in the past for evaluating 4464 DRAMs before writing my own Atari 8 bit memory diagnostic tool and now I use the 65xe exclusively for testing 4 bit ram chips. So I socketed the board and swapped out the DRAMs this morning and I’m back up and running again. I believe I may have introduced static when I was working on the machine. Gotta be more careful next time!
  13. That's interesting. Great that you got the other board working. I socketed my IOU a couple of days ago and all was working fine whilst playing The Goonies until the machine totally locked up this evening. Appears the onboard RAM has shat itself. Power is good at 4.97v, so I'll have to order some new RAM chips as well. Edit: I realise I have a pair of 4464s on hand that I used to have in my 600xl, it currently has the Antonia board so I can go ahead and install the ram in the Apple IIe.
  14. You could type in a short basic program using plot. Haven’t tested it but it should work. Should print a horizontal line across the screen in all 16 colours. 10 GR 20 FOR I=0 TO 15 30 PLOT I,0 40 PLOT I,1 50 COLOR=I 60 NEXT I
  15. In regards to the IIe, the technical reference guide in chapter 7 states that the IOU is responsible for generating the video signals, including vertical blanking. The horizontal signals are derived from a chain of internal counters. So there has to be more to this although itآ’s not entirely clear if the original ASIC is the 50/60hz version or just the 50hz, if it is the 50/60hz then Iآ’m wasting my time with this experiment. http://www.applelogic.org/files/AIIETECHREF3.pdf There was a case where someone replaced the IOU with a different one in a platinum machine and noted horizontal shimmer on the screen and the image was not centred correctly. Replaced the 0022A with 0020A. https://www.classic-computers.org.nz/blog/2010-03-04-diagnosing-apple-ii-platinum-screen-sway.htm
  16. I didn’t end up getting the fjc preflashed version. Ordered the other before realising. I’ll just download the firmware and flash it myself then send flashjazzcat a donation for his hard work. I found it difficult to source one locally so I opted for an NTSC version from the U.S, it ended up being worthwhile.
  17. I've just placed an order for it. I just reminded myself about how crazy the prices have been for these on eBay recently I figured I'm going to need it once I get rid of the 800xl and the 65xe. So it'll just be holding on to the 600xl and the 800. My 800 has an SCCC upgrade, and the keyboard is fantastic.
  18. Doesn’t RGB scart solve that issue on the Master System as well ? I modded a Mega Drive for a mate to switch between ntsc and pal. Obviously no colour on his CM8833 Philips monitor when switched over but we ended up solving that issue by using RGB scart. There were RGB cards made for the Apple II but those are pretty rare.
  19. Definitely interested in getting one for my 800 however, he’s asking 3 x more the original price, so maybe it will be more worthwhile to wait for Incognito 2.
  20. I can only speak for myself here but my LCD TV recognises the signal as PAL ( and most likely my other monitors as well ). I also forgot to mention that it's also not really locking sync properly and fading in and out. Not sure how that is determined and why but it seems wrong to me. I'll see how I go with the replacement IOU.
  21. https://comp.sys.apple2.narkive.com/uyOi7vAj/international-ntsc-apple-iie-motherboard My understanding is that there needs to be a direct connection between the colour subcarrier of 3.58Mhz and the vertical frame rate for most TVs and monitors. Strange combinations leads to the reluctance of many television sets not being able to reproduce NTSC colour.
  22. The information out there seems to be a little sketchy. I don't know if there even is 50/60hz version, I suspect that info comes from the following two pages http://www.vcfed.org/forum/showthread.php?19522-Causes-of-monitor-quot-sway-quot-(apart-from-AC-ripples)/page3 http://www.applelogic.org/APPLEASICs.html However, the Apple //c 344-0021 part # appears to be 60Hz NTSC spec. I've never seen one in a //e ( would love someone to prove me wrong. ) Also the 344-0022 is also found in the PAL models with associated PAL circuitry. ( Y2 4.43361875 MHz for the PAL sub carrier frequency) http://www.applelogic.org/files/3420150loc.JPG One thing is certain, is that the later U.S Apple IIes ( and platinums ) had the 344-0020 IOU which were 60hz NTSC and the 14.31818Mhz crystal at Y1. Those appear to be the main differences between theirs and ours. I don't have the chip yet. I've bought a complete motherboard which has the above IOU socketed. My monitors are still picking up the signal from the Apple IIe as PAL and my scope confirms line frequency of 15.6 ( PAL ) nstead of 15.7 ( NTSC ). - - - Updated - - - In contrast to the above results, I just checked the horizontal frequency coming from my Atari 800 which is an NTSC model I imported from the U.S. I have no problem displaying the picture from my 800 my PVM. So I think in addition to replacing the crystal, we most likely need to replace the IOU as well for proper NTSC conversion. - - - Updated - - - The NTSC International appears to has the correct horizontal frequency for PAL but I suspect the sub carrier frequency used for the colour might still be 3.57 in a stock machine, should be 4.4mhz for PAL which may explain the reason we are not able to see colour on our standard PAL televisions and monitors. The Apple Colour Composite monitors are designed to deal with that but standard PAL monitors are not going to see it. I just checked the crystal oscillator and dividers, colour clock looks fine for NTSC. But I do have the new crystal in there now.
  23. It may be attributed to the 50hz PAL IOU ( 344-0022 ). I'm going to try the 344-0020 ( 60Hz NTSC IOU ) and see if that solves my problem. I don't have a lot of CRTs to test..
  24. Pretty interesting information which seems to contradict the information already out there. http://members.iinet.net.au/~kalandi/apple/AUG/1995/08%20AUG/MEG80Z.html
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