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INTV123

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Posts posted by INTV123

  2. Posted

    ive had a broken INTV 3 for awhile, and i narrowed the problems with it down to either a bad CPU or RAM chip. Found a working intellivison 2 recently and tried swapping some chips from the 3 to the 2, and found that the ram did the exact same thing as when it was in the intv 3. The CPU worked fine. Figured i may as well see if i can find a replacement chip from someone. 

  3. Posted

    29 minutes ago, ChildOfCv said:

    Judging by the fact that your chip is getting hot in spite of getting correct voltages (I assume that's searing and not just a little warm?), it is possible that your STIC (AY-3-8900-1) is the problem.  The service manual also mentions that as a possible cause of video problems.  And wavy text with a vertical line definitely sounds like it's in that category.

    Yea the plastic was slightly yellowed above the chip when I got it and will burn you after a few minutes of running. Also I meant the lines are horizontal with the text.

  5. Posted

    I've been trying to mod my intellivion 2 to output composite video. I almost have the thing working, but the video signal is still having problems. text characters will start to shake after about 3 seconds of running, and there is a white line going down the screen lined up with the characters. I tried putting a 2000uf cap across the 5v line, but that didn't do anything. Ive checked the mod board multiple time times, but haven't found any problems with it that fixed the signal. also the rf modulator never output any video signal so i don't have any way to see if its a problem with the console. also don't have any extra rf modulators or consoles to test with. 

  6. Posted

    7 hours ago, ChildOfCv said:

    The service manual says that the voltage at pin 2 of the modulator should be 6V.  So that sounds normal.

     

    So you're using the traditional mod.  Did you order it or build it yourself?  You should probably check it for solder blobs and such.  Also, if the tracks are bare and on the bottom, make sure it's not touching anything metal.

     

    And of course the most important question:  Without the mod hooked up, does the video distort?

    Never mind, didn't change anything. i checked the voltages on the transistors and they are similar but not exactly the same as what was listed on the wiki.

  7. Posted

    5 hours ago, ChildOfCv said:

    The service manual says that the voltage at pin 2 of the modulator should be 6V.  So that sounds normal.

     

    So you're using the traditional mod.  Did you order it or build it yourself?  You should probably check it for solder blobs and such.  Also, if the tracks are bare and on the bottom, make sure it's not touching anything metal.

     

    And of course the most important question:  Without the mod hooked up, does the video distort?

    so... the cap on the video input side is measuring a short. that may be the problem; ill have to go buy a new cap to replace it with and see if that works. just wondering how it died in the first place?

  8. Posted

    5 hours ago, ChildOfCv said:

    The service manual says that the voltage at pin 2 of the modulator should be 6V.  So that sounds normal.

     

    So you're using the traditional mod.  Did you order it or build it yourself?  You should probably check it for solder blobs and such.  Also, if the tracks are bare and on the bottom, make sure it's not touching anything metal.

     

    And of course the most important question:  Without the mod hooked up, does the video distort?

    i wasn't getting any signal without the mod. its one i made myself and i checked for shorts before i hooked it up, but i figured it woudn't do anything if there was a problem. 

  9. Posted

    5 hours ago, ChildOfCv said:

    Yeah that's the video chip.  It has some special power requirements, apparently.  Pin 40 should be -2.25V, pin 17 is ground, and pin 20 is 5.7V.  Neither of those should greatly affect the 12V power, but if it's pulling excessive power, it could be affecting all rails.

     

    https://console5.com/techwiki/images/c/c3/Intellivision_II_Service_Manual%2C_Model_5872.pdf is the service manual.  The allowed voltage ranges on the power board for each output are:

     

    TP1,TP2 - 16V-20V

    TP3 - Ground

    TP4 - -2.10V to -2.40V

    TP5 - +5.45V to +5.95V

    TP6 - +11.5V to +12.5V

    TP7 - +4.86V to +5.15V

    TP8 - +21V when off, +5V when on, and 0V while reset held

    voltages on the video chip seems OK, same with the power supply. i'm assuming tp1-tp2 means between the two pins, and i'm getting 16.9vac. 

  11. Posted

    2 hours ago, ChildOfCv said:

    The real cause of loss of voltage is that the power supply can't keep up with the demands of its load.  In a formerly working system, that typically means that something went wrong.  But the question is, is it due to something pulling too much power?  Or is the supply too weak?

     

    Electrolytic capacitors can go bad and short out.  But typically when they do, it's because the electrolyte has leaked out.  When it does, it stains and corrodes the board.  So look closely at the board to see if solder joints or pins are corroded around it, or if there is an odd "spill" around any of them.  If so, remove the cap, clean off all of the electrolyte and corrosion, then add a new one.

     

    But if a chip is getting hot, it likely pulling power and is the cause of the trouble.  Which one?

    Pretty sure its the video chip, but can't tell. It's labeled ay-3-8900-1s... i think. Its hard to read. 

  12. Posted

    My intelvison 2 isn't outputting 12v when the rf modulator is connected. If I remove it the connection reads exactly 12v but as soon as its connected it drops to 11-6ish volts. Also was not getting any video from the rf out, and my composite mod is having problems keeping a stable signal. Wondering if the low voltage is the source of the problem. Also one of the ic's gets really hot and I'm not sure if that's related to the voltage or if that's normal. There is actually some yellowing inside the case in the area that its located.

  13. Posted

    I noticed that when my mod board is connected the 12v connection for the rf modulator drops to like 4v. also noticed that when its disconnected it's still only like 11.4v. And one of the chips on the board gets very hot. I'm wondering if this is why after a few seconds of use the picture becomes less stable (text characters basically shake) Also i took the cage off the rf modulator to make room so not sure if that has anything to do with my problem. 

     

    been trying to get this thing to work for so long its kind of annoying. 

  14. Posted

    Trying to mod my INTV 2 to output composite video. I wanted to remove the RF modulator and found this circuit Here to get the mod to work with the composite mod from the Intellivsion wiki, and it sort of worked... the picture would show up for about a second or two and then the colors would change, and the video slides across the screen and loses signal. Tried putting the rf mod back together, and got the exact same results as the board i tried making. Mind you, I don't know if the rf modulator even worked, as i couldn't get anything to show up on my tv from it using some alligator clips. Also not sure if there may be some other problem with the board or the power supply i'm using. 

  16. Posted · Edited by INTV123

    I was thinking of Modding my 2600 JR to output AV video. I did a mod to my JR around a year ago, and i ended up killing my board when i tried changing the jacks on it, and i can't find the original posting for the mod i Did. I saw this AV mod for the JR, and i was wondering how well it worked. https://atariage.com/howto/composite.html

    I think i remember some people saying the video quality wasn't the best, but I am just looking for something that is reasonably good enough to use.

     

     

    If the link does not work just try googling "atariage 2600 jr av"

  17. Posted

    I have a 2600 jr motherboard that i broke while trying to update a AV mod i did to it. it still outputs a video signal, although in black and white, and it seems to not want to sync with the TV. also there is no sound, due to a broken Capactor. I live in canada, so US shipping is probably going to be a little more (like 12 bucks us for international)

     

    I want $10 for the board. You can make an offer if you want to, although i'm trying to make up for having to buy another one.

     

    Also if there is any good AV mods for the JR that are not to complex let me know.

  18. Posted

    I recently bought a broken intellivision off of eBay, and after messing around with it i believe that the problem is the CPU. I don't have a working unit, or any other units for that matter. I was hoping i could find a new cpu (preferably a whole board, in case there is any other problems with it) from someone on this form. I really want to try and play some intv games, especially since they are cheap.

  19. Posted

    I don't have a direct fix for your issue. But if you have another INTV console you can swap parts from the "bad" unit into the "good" unit to see which ones keep the "good" unit from working. This may require socketing ICs in one or both of the consoles. A lot of work, but it can be fun to do.

    no, i don't have any others. Was hoping someone had some extra chips i could try.

  20. Posted

    If the leads to each RCA connector only have one wire each, you probably don't have much options. If each lead has one signal wire and a ground wire, you're better prepared.

     

    Since it came from China, I suppose it was cheaper than it would've cost you to get a 5-pin DIN connector, two RCA plugs and a cable with enough wires and DIY from scratch?

     

    I figured it would look better to have a proper cable... it was also like $5

     

    the RCA cables have a ground connection, and are tied together, just are not connected anywhere on the din connector end.

    • Like 1

  21. Posted

    i bought a video cable for the c64 from eBay. came in the mail yesterday, and i tried it out today. Tried it on both the vic and the 64, and it like made a white line, and then nothing. didn't even send anything to my flat screen tv, i checked the cable with my meter and found that the ground on the rca cables was not connected to she ground on the jack that goes into the system, or any pins. i figured that that was the issue. any ideas for how to repair (is it even a repair if it was made wrong?) besides just solder a wire to both ends of the cable... though pretty sure that's what im going to have to to, but thought i should ask for advice.

  22. Posted

    i got an intv 3 that only outputs a black screen. tried replacing the transistors, cleaning the cartage port, re seating the chips, etc. one of the ram chips was backwards, and after fixing that it sorta did something... well still a black screen, but when the reset button is pushed or cartage moved around, sometimes dots or lines appear for a moment on the tv. i think its the cpu, but i'm not too sure. was hoping someone here can help me.

  23. Posted · Edited by INTV123

    so about a year ago i did a 2600 Jr av mod i found somewhere where you added 3 resistors to some pins on a chip and got composite video out... only problem is i tried adding a set of jacks instead of having a cable hang out... but now the video signal is gone. i spent like 3 hours trying to fix it, but all i get is scrolling white. i can sorta see some of the sprites, but i can't figure out what was going on, and ended up removing the added parts... but now the capacitor for sound lost a leg... so i need a new one of those also. anyone know of the mod i'm talking about, like i said i cant find it again, or at least another one that worked for you?

     

    also it does the same thing when RF is connected back.

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