I have a devkit HKT-0120 that has been stored in it's box for over 10 years. I believe it powered on and worked when I last tried it but now I don't get anything when I plug it in and push the power button. No lights, nothing. Any ideas what the issue might be? If the CMOS battery is dead will that prevent it from powering up? Thanks in advance for your advice.
Franco23444
Grand Master
Could the power supply be dead? Leaking capacitors?
First point of call would be to open it up and look at what @Franco23444 said.
Ok, I'll open it up and take a look. It looks like some disassembly is required to get a good visual inspection of the main board. I'll post back after I have done that. Thanks @Franco23444 and @djsheep for your responses.
Here's what I did and observed:
Unplugged power cord and opened up the box; removed the drive to access the main board. The capacitors appear pristine, no swelling that I can see.
To test the power supply I disconnected the 20 pin power connector from the main board; put a jumper (paper clip) between pin 14 and pin 15 and plugged in the power cord. The fan did not spin and I did not get any voltage on pins 19 or 20. So, I assume the PSU is dead? Any other tests I should do?
I also checked for voltage from the CMOS battery on the main board and got virtually none. Let's say I find a replacement power supply that fits. The cmos battery does not appear to be replaceable. How would I deal with that?
Thanks in advance @Franco23444 and @djsheep
Unplugged power cord and opened up the box; removed the drive to access the main board. The capacitors appear pristine, no swelling that I can see.
To test the power supply I disconnected the 20 pin power connector from the main board; put a jumper (paper clip) between pin 14 and pin 15 and plugged in the power cord. The fan did not spin and I did not get any voltage on pins 19 or 20. So, I assume the PSU is dead? Any other tests I should do?
I also checked for voltage from the CMOS battery on the main board and got virtually none. Let's say I find a replacement power supply that fits. The cmos battery does not appear to be replaceable. How would I deal with that?
Thanks in advance @Franco23444 and @djsheep
MetalliC
Champion
I've never seen the PSU of this Devkit, but looks like the one from a regular PC PSU, is that right? If that's the case, then you can just replace it with a regular PC PSU.
On the pictures that you posted, you can see 2 leds for 5V and 3.3V. These should tell you if the unit is being properly powered, which seems not to be the case.
Last but not least. That PSU is working at 110 or 220V?
The PSU is a Bestec model ATX250 which I believe is an ATX version 1 20 pin power supply. It is buried at the bottom of the case, very tight fit, and will require full disassembly to remove. I think I might be able to find a unit with the dimensions to replace it. I wasn't sure what those 2 leds indicated but no, they don't light up at all.
I toggled the 110/220 switch back and forth a couple times (without power) in case it was dirty but I'm using 110.
I really would like to get this machine to fire up, at least to the self-test stage.
Thanks for the reply. Looks like I have an adventure ahead.
You don't need to remove the PSU for testing. If it's ATX compatible, just unplug the power cable and connect the cable of another psu that you temporarily plug. That should clarify things.
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Thanks for that advice. I don't have another power supply with a 20 pin connector but I can probably borrow one from a friend.
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It's ALIVE! Next steps: find a game to test the GD-ROM drive. I thought I had a couple somewhere but I may have to go to ebay. Then, search for a working power supply that will fit the case.
Thanks to @Franco23444 @djsheep and @Darksoft for nudging me in the right direction with this.
Thanks to @Franco23444 @djsheep and @Darksoft for nudging me in the right direction with this.
Lovely! Glad you got it up and running. Was it the PSU?
Stupid Dufus
Grand Master
No disassemble!
No disassemble for now! As suggested earlier I just plugged in an extra power supply outside the case and confirmed it will boot and run. I'll have to disassemble to install a replacement psu if I can find one that fits the case.
Definitely the PSU. What I don't understand is why a power supply will just die sitting in a box.
MetalliC
Champion
because it is ~20yr old PSU full of probably dead by now electrolytic capacitors ?
Franco23444
Grand Master
Those units look gorgeous, bet they were pretty expensive as well. Awesome job and I’m glad to be able to help! 
MetalliC
Champion
everything is relative. for Dreamcast game development also required Power Macintosh for sound&music development, and Silicon Graphics (recommended) for 3D graphics. models etc development, probably there was needed several of each machine, and these are at least not cheaper than Katana box,
also, if I not mistaken, the license from Sega was most pricey part.