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Vyncynt

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Posts posted by Vyncynt

  2. Posted

    Even if the ingot was putting out 10 volts or more (highly unlikely), the LEDs should be OK. The LED is forward biased thru a 220 ohm resistor, which limits the current in the diode.

     

    So, it may be the k/b connector or a loose solder joint. Regardless of the power LED, you should get some kind of screen flash or audio pop when you power on. If you have 5 volts reaching the power buss.

     

    Bob

     

    Yep, verified. Used my Raspberry Pi breadboard kit to test. Put a 220 ohm resistor inline and tested with a dummy LED, then tested the keyboard LEDs. Both are ok.

  4. Posted

    power switch stuck in off position internally? shorted and blown cap?

     

    Possibly. I checked both. Here's what I found.

     

    Machine A appears to be older. No revision number or date on the board. RF shielding was screwed down. Chips are NOT socketed.

     

    Machine B appears to be newer. Revision A2 (1983). RF shielding was crimped down. Chips ARE socketed (yay!). Found a detachable red lead running from the board at 13 to the cartridge bay dust cover/doors.

     

    Just to be sure, I tested the both keyboard LEDs by running 3.3V and a 220 ohm resistor. Both work normally.

     

    On both systems, I tested the lower leads from the power switch. They show 0 ohms when off, and machine A shows 1 ohm, machine B shows 0.8 ohms when on. I don't know what to check after that.

  5. Posted

    It would be useful to know if your 'ingot' power supply is bad or not. If the supply has failed, it should output 7 or 8 volts.

     

    Measure your old ingot output (unloaded). If it is 5 volts, you may have some other problem. Hard to understand no LEDs. Not much has to work for them to come on.

     

    Bob

     

    I didn't realize the need to test this, but already trashed the old ingot.

  6. Posted

    As was recently discussed on this form, an ATX power supply requires a minimum load to operate correctly. I'm not sure the Atari draws enough current to operate with an ATX power supply. A 2-3 Amp 5V DC power supply designed for a Raspberry Pi should work better. You'll just need to splice in a DIN plug. These power supplies are widely available for $9-$14.

     

    I had a couple of regular hard drives connected also and they powered up normally.

  7. Posted

    Your ingot may have killed both systems in your tests but no way to be 100% sure yet. Have you verified that that your new-made PSU matches the correct XL power DIN is correct?

     

    http://atariage.com/forums/topic/184792-800xl-power-supply-connector/?p=2323544

     

    Once you've confirmed your pinout, get a multimeter and make sure the 5 volt line is putting out the correct voltage and it's nice and stable.

     

    After that, it gets more complicated, especially if your boards are not socketed. The usual damage caused by an Ingot PSU going bad is memory, but really it could be any of the main IC's. But first thing's first: verify your DIN pinout with a meter.

     

    I appreciate the information.

     

    That's what I was afraid of. I matched the 5V and GND connections correctly. Yes, 5V is very stable at the splice and the DIN pinout.

     

    I read some older topics where people said Best Electronics sells a fully populated 800XL motherboard. I'm considering just buying one ($69) along with the repairable power supply ($27) so I don't have to deal with the hassle. Curious if http://www.best-electronics-ca.com is the correct address. The web page looks pretty dated. Wondering if anyone else has bought either of those items and if the boards are soldered or socketed.

  8. Posted · Edited by Vyncynt

    What I have

    I have two 800XL's (NTSC) which were both in storage for 10+ years. I only had one Atari power supply, which I learned was the "ingot". Both worked prior to insertion in storage.

     

    I also have two 1050 drives, each with their own PSU. Both of those power up just fine. I did not have them connected when I tested the 800XLs.

     

    Problem
    Neither will power up. Power LEDs do not illuminate. Nothing on the screen.

     

    What I tried
    1. Initially tried connecting the PSU to the computer, but no power LED and nothing on the screen. No smoke, sparks, or explosions either. Had it connected about 10 seconds to each.
    2. Tested a 5V ATX PSU (correctly jumpered and tested with a hard drive). Butchered the ingot PSU's DIN cable and wired it into a molex connector (black wire to red, black wire w/white stripe to black). Connected to the computer. Tested across the leads and read 5V DC. No power. Also tested with my Amiga's Bigfoot PSU w/molex connectors, but no luck either. Same results.
    3. Connected to TV with RF and then to a monitor with monitor cable, nothing on the screen.
    4. I wore a nerd bracelet and disassembled both. Caps are not visibly leaking. Chips are NOT socketed to the board.

     

    Need Help

    Does anyone know of a troubleshooting guide or tips to try to make them work? I have minimal electronics experience, but do have a pretty good voltmeter and am comfortable soldering. I realize I might need to replace components or the system outright (if I can find a working one for a reasonable price).

     

    Thanks!

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