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Ildefonso

6502
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    15
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About Ildefonso

  • Birthday 05/30/1959

Profile Information

  • Gender
    Male
  • Location
    Valencia (Spain)
  • Interests
    Old computers, like Ibm’, SGI’s, but specially interested in Macs and Apples

Recent Profile Visitors

183 profile views
  1. Ildefonso

    Macintosh SE video problem

    As an update to the request for help I made, I’ve tried an other analog board and now the mac is flawlesly working. That should mean that the fault is in the original analog board. As said, I’ve followed all the Larry Pinas advices and changed resistors 20, 21 and 22, the U1 chip and the variable resistor 24 (the one that regulates the cut-off). Any aditional clue?
  2. Ildefonso

    Diagnosing a Plus that won't turn on

    I solved a similar problem in my mac plus changing the R46 resistor (look at Larry Pinas “The Dead Mac Scrolls”, page 23)
  3. Ildefonso

    Macintosh SE video problem

    Thanks to all you guys in advance for helping me to solve my problem. I recently bought a mac SE with the tipical scanlines video problem. Here an image of what I’m talking about As you can see in the image the mac starts to the desktop, the start bong can be heard, but the image displayed has this scanlines patern. I’ve followed all the Larry Pinas steps recomended in his Dead Mac Scrolls book, changed resistors 20 and 21, tried to tune up the cut-off resistor, but nothing has changed. Furthmore, I’ve swaped a known good working analog and video crt boards with the same result, which make me think that the fault is in the logic board, but I’ve not been able to find any clue regarding this video problem in relation with the logic board. Any help would be greatly appreciate.
  4. Ildefonso

    Lisa display problem

    Hi guys. Problem solved thanks your advices. My Lisa is once again up and running... The culprit, one of the two 470mF/250V capacitors from the power supply that was shorted... But the second time I turned on the Lisa I got the following error which I solved simply reinserting the motherboard. Anyway I fear what’s the real problem I got. Any idea? file
  5. Ildefonso

    Lisa display problem

    Thanks for the replay, apm. Any advice is of great help because I’m very lost with this Lisa systems. I’ve ordered all the caps for both power supply and video card and will keep the fingers crossed
  6. Ildefonso

    Lisa display problem

    As you says, Gilles, perfectly looking capacitors can be faulty. I’ll give it a try since replacing the capacitors will not be harmful at all. I’ll keep you informed of my progress...
  7. Ildefonso

    Lisa display problem

    Hi MOS8_030. Thanks for your quick answer. I’ve carefully inspect both power supply and display card and the capacitors look pretty fine. Everything looks pristine new. Anyway, I’ll check them, but I fear the problem is’nt capacitors related.
  8. Ildefonso

    Lisa display problem

    Hi. It’s the first time I take part in the forum. I’ve been collecting vintage macs during the last two years and, finally, I’ve been so fortunate to put my hands on one Lisa 2/10. I bought it 4 months ago, and it was perfectly working, but now the display has stop working. When I turn the Lisa on it makes a scaring sound and the image is totally distorted. I thought it could be a broken flyback and changed it but nothing changed. Could any one of you, more expert then me, give me any advice where could I begin to try to fix it? In general, the Lisa looks like new, even the video card looks pretty new. Thanks in advance. (I’ve uploaded a video so that you can have a better idea what I’m talking about) 4C29BBB2-D884-4D66-8E7E-2D2692B95AD2.MOV
  9. Ildefonso

    SE/30 video problem

    That sounds not very promising, meaning I will need a lot of work and luck to make it work againHow can I identify this traces in the board and in the schematics?
  10. Ildefonso

    SE/30 video problem

    Hi all you. This is the video I get from my recently adquired SE/30. No chimes at the boot, but the desktop and the moving mouse pointer can be barely seen, meaning that that the logic board works, but there is an evident video issue. Cleaning the logic board and changing all the capacitors (except the two axials) has changed nothing. Any idea how to solve the issue? (Sorry for the upside down image, but I do'nt know how to send it correctly)
  11. Ildefonso

    Mac Classic troubles

    Yes. That's has been the solution. I've recaped the analog board and resoldered every solder joint and the Classic has return to live!!! Now there rest two problems to be solved: no sound (wich will require recaping the logic board) and a faulty disk drive, not very hard to be repaired (I hope ) Thanks for the answer
  12. Ildefonso

    Mac Classic troubles

    Hhhmmm, sorry for the mistake, I wanted to say "power section of the analog board". And ca'nt see the video I atached???
  13. Ildefonso

    Mac Classic troubles

    I recently bought a faulty Mac Classic. No bong, no raster at the start at all. Opened the little creature I found some leaky capacitors in the power section of the logic board, which I changed. I also washed-cleaned the logic board. But this is the result, no bong at startup and the image in the attached video. Any clue where should I dig? Thanks????
  14. Ildefonso

    Trying to rescue a Mac Plus

    I've changed all the capacitors and refreshen all the solder joints in J1, J2 and J4. The loose of voltage after a few minutes made me think in a capacitors problem but nothing has changed after recaping the analog board. Could the variable resistor of the voltage regulator be part of the problem. I ca'nt figure the responsible of the voltage loose...
  15. Ildefonso

    Trying to rescue a Mac Plus

    Hello all you guys. I'm having a lot of troubles trying to get an European Mac Plus to work. When I start it I get the flup flup flup noice with a black screen. After an other start try I get a series of start bongs with no image. The third start try I get the starting bong and the image with the floppy disk, but the image is flickering, more in the sides then in the center of the image. But after a few minutes an other bong can be heard and the image of the floppy desapears substituted with black and white vertical lines. I've detect a voltage drop in the 12V pin7 of the external floppy disk connector from the initial 12.80V down to 10.30V, when I only get black and white vertical stripes. I've changed both CR20 and CR21, as so as the filter capacitors with no differente result in the sinthoms. Even tweeking the voltage regulator has no effect in the resulting voltage. Any advice would be greatly appreciate because I'm making my best to safe the Plus from the trash.
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