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falen5

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  1. Hi folks. Selling off my collection slowly. Got to this little oddity This is part of the haul I picked up from Cork here in Ireland from a guy that worked in the Apple plant in the 80's and 90's. This is an SE with a difference. The plastic of the front panel is perfectly smooth. It is hard to see in the pictures. But this was molded before they applied the textured finish to the mold, that we see in all other Macs. I never really looked at it when i got it. But now going through it , the first thing i noticed is the apple badge on the side. 000177e. I have allot of these macs with similar badges from that haul. Looking at the extreme screen burn , I can see 'Apple Share" and other stuff. I inverted the picture to show the burn better The logic board has roms unlike the other se's i have and 2 of the rams are very big , again unlike any i have. The rear cover is just a standard rear cover of an SE, with the usual texture. Im trying to figure out if the logic board and analog board is early like the cover. I have not done anything to this machine. It is as I got it. I dont know should I strip it and clean / wash it or just leave it as it is. any thoughts folks
  2. falen5

    SE with no sound

    I have a dead se/30 board (in 2 halfs, thats how much that one upset me!!) - it has the same sony sound chip as the SE board. will swap the sound chip - only thing left to try
  3. falen5

    SE with no sound

    pins 1 and 2 closed as they should be. looking at these little tantulam caps - they either work or explode right ? have looked a all of them with magnafying glass. I just cant see ant signs of damage anywhere. The board looks brand new!! checked both reset and interupt switches - they look good. Problem is 100% on the board - have tested other , good board in machine and sound perfect. Its not the analog board, the speaker or the jack connector. might as well swap the roms now. I dont know what else to try. swapped the roms - no change thought i saw a crack in solder of pin on sony sound chip - reflowed all pins - still no sound. i get the static click when i power on the machine , like all macs, thats followed by the beep....... but no beep from this. will try the heat test - power it up for 10 mins and feel the chips for high temps. ah feck it - enough for tonight Beer time.
  4. falen5

    SE with no sound

    just booted to desktop again. Pressed reset. a full 10 seconds pass, mouse frozen, nothing happening, then it resets Thats how it boots from powerup. screen of junk, 10 seconds pass , then reset, memory check then boot. Thats not correct. It is supposed to reset as soon as you press the button. Or was that classics!!! Dam its hard to remember stuff from model to model. will check the jack pins now.
  5. falen5

    SE with no sound

    thanks Alaska. looking at that diagram - if pins 2 ans 3 of the audio jack are shorting then the speaker would be off ? looking again - it says microphone jack - i thought that was a headphones jack have swapped all four rams from good se - now have 4 meg of ram. That link you shared in ur previous post was very helpful I didnt know that to get to 2 or 4 meg you actually remove the jumper. I was moving it from the 1 meg position to the 2/4meg position ive thought half my machines have bad rams - for Years !!! any point in switching the roms ? machine boots fine , runs fine , just no sound. Just discovered - the reset and interupt switch's dont do anything. And when you turn the machine on the screen is filled with junk - long pause - then it resets itself, checks its ram , and then boots. That is not the usual sequence. Something going on with the reset and the reset during power up. Maybey sound issue is related
  6. falen5

    SE with no sound

    Already tried it Alaska. No change. will swap the rams with the working SE - might as well swap the roms as well - this has me stumped. I searched the threads , for a long time, cant find anyone else with no sound on an SE. Board is in excelent condition. I removed the battery holder to have a look under - looks clean. No acid leaks, no electrolite leaks possible dead soundchip? - dont think ive heard of that on and SE before either !! I dont like this hobby anymore !!!!!!!! hahahah
  7. falen5

    SE with no sound

    Tried another working se. Swapped good logic board into machine - sound good. Sp speaker is working. Tried bad board in good se - no sound. So its not the analog board either. Still no sound. Problem is definatley on the se's logic board. Either I have leaking caps on the se logic board somewhere, or a dead sound chip. When i turn on the machine, i get a screen of random crap for about 10 to 15 seconds, then it resets itself and boots normally. That is not a normal boot for an se. Get to the desktop. Everything is good. Just no sound. Tried the headphones - no sound. Have never had this problem on an SE before. I have snipped 2 of the caps on one side to test them - they were in spec. Only other thing now is to test them all
  8. falen5

    SE with no sound

    Thats what i Thought Ive never had to recap one of them. I checked a few of the caps and there values are right where they are supposed to be. did find this - there are 2 of the 4 ram slots populated - banks 3 and 4 when i relocated them to 1 and 2 it wont boot at all wondering if i have dodgy memory modules - would they mess with the sound!! taking down another se - this is driving me nuts
  9. falen5

    SE with no sound

    anyone?? Anyone every have to change the radial caps on an se logic board for no sound ??
  10. falen5

    SE with no sound

    Hello again peoples. Took down one of my SE's. Turned it on and no sound. As far as I know the SE's sound system is all on the logic board and not the analog. Nothing from the headphones jack either. Has anyone ever had to replace the caps on an SE yet. I havnt!. Then again these machines, like myself, are not getting any younger. Perfect 5 and 12 volts present on hard drive.
  11. falen5

    Portable and 12 volts !!!

    Darn wont be easy !! Thanks Techknight.
  12. I have a classic II with a broken CRT. Just wondering if the screen from an SE would be ok to replace it, or are there differences. I know that the 128K screens are different from the rest. Not sure about the rest of the models.
  13. falen5

    Portable and 12 volts !!!

    Hey Techknight. Ive done as you asked.. Good battery, fully charged plugged in. Pressed and held both nmi and reset together , for 5 seconds took readings from Q16 and Q20 ( wasnt sure which one you meant) naming pins 1 to 3 , as you look at them from left to right, with hybrid on bottom left q16. 1= 2.86 , 2= 5.16, 3= 6.44 after hitting spacebar readings are the same. Q20 1=5.85 , 2 = 0 , 3 = 6.44 after hitting spacebar readings are the same. I have a good 6.5 volts on both red wires on battery molex connector. No heat on any chips anywhere. I see power going into the pmu Cant see any voltage going to cpu or roms.
  14. falen5

    Portable and 12 volts !!!

    Using my old method of fault finding now. I have my working portable logic board, next to my 12 volt special!! Taking readings from components on good board and comparing to the bad one. They are all the same so far. On the hybrid board I cant see any resistors. Only caps, transistors and chips. Those little black square are printed on resistors??( thats how we used to make the potentiometers in boruns electronics. The resistance 'goo' was printed onto the ceramic , in the horse shoe shape, and then cooked in the oven) Now comparing every resistor on the board - and thats allot of resistors. So far they are all the same. Can anyone hazard a guess at what component may have been damaged from stupidly/ mistakingly plugging in a 12 volt supply. I honestly cant see any signs of visible damage. Anywhere. No smells of burning. No components heating up. Decided to wash the board again for the laugh. No change. Ill just keep talking to the board, and looking at it in a funny.
  15. falen5

    Portable and 12 volts !!!

    Had a look and all I can safely say is there is no power going to the 8pin chip , on the hybrid, furthest from the reset /interupt switches. it has the numbers - 8925 and LT1054 on it.(circled in red in the picture) I see different voltages all over the place 6.5 volt ,6 , 3.5 , 2.2 All the other chips are getting power (it seems) except that one. I tried with the external power supply, and then the main battery - still no power going to that chip Only after taking a picture with the camera and zooming in I see either a resistor or capacitor that looks cooked - circled in green. Ive never seen a circuit board like this before - what are all those little black rectangles - are they connections, or 'painted on' resistors !!! Im scared to ask , but are there more components and traces on the underside of this hybrid board - how would you even take hybrid board off to have a look !!! I have no electronics training Laporta - of any kind. I can solder , recap, and do a continuity test with a meter..... not much else.
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