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Trying to FIX a Faulty SEGA Dreamcast purchased on eBay
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- เผยแพร่เมื่อ 3 พ.ย. 2018
- Hi, this video shows me attempting to fix a faulty SEGA Dreamcast that I purchased on eBay. This was actually filmed a couple of months ago but I never got round to putting it on TH-cam, so some of the equipment in the video that I am using may be old unlike my other recent videos.
Remember that this is just for entertainment and I am not an expert in these repairs. The processes in the video may not be the best way, the correct way or the safest way to fix these things.
I do love fault finding and trying to fix broken things so I hope that comes across in this 'Trying to FIX' series.
Many thanks, Vince.
The component you are unsure about is a crystal, normally used for a specific frequency oscillator reference. It looked like you were measuring the resistance of the pot while the unit was powered up which is a NO NO. NEVER measure resistance of a component while power is applied to the board as you will possibly damage your meter, the board or both.
I got a black Dreamcast from Best Buy for 50 bucks back in 2001. Definitely worth the purchase. I played the absolute hell out of that thing and it still works like new today. Meanwhile my PS2 and Xbox all broke within a few years.
A tip from an electronic engineer: when you're measuring the resistance with the DMM (digital multimeter), the resistor/potentiometer mustn't be powered. That's because the DMM imposes an adjusted current into the resistor, it reads the voltage drop across the resistor itself and after that uses the Ohm law to calculate the resistance. If that resistor is powered up, another current is adding to the adjusted current from the DMM, so the reading is far off!
Edit: that cilindrical thing that you couldn't identify (in the disc unit board) is a crystal oscillator
Thanks for the tips :-)
...when you're measuring the resistance with the digital multi meter (DMM), the resistor...
Exactly!!
"It's quite loud." Haha, welcome to the Dreamcast ;)
I love the honesty of this restoration channel. He is not an expert and also not assuming to be. I subscribe.
You are a very persistent person on projects. Really really good. Excellent fault finder. Great work Vince and very informative.
I fell asleep watching a guy fix 12 PlayStations 4 and woke up to you fixing this
A failure? Sir your tenaciousness is inspiring!
God bless your wife. She seems to be supportive of your desire for knowledge. Allowing you to buy another Dreamcast just to learn more about them!
To true but don't think it's about allowing he's a grown man more supporting of his hobby.
@@laylajonesCD That statement has been made by someone who obviously isn't married! ;-)
This must be cuckest comment i ever have seen
I love how much you try and how in depth you go !!!! I'm same with cars have to know the fault
Thanks for the video, it's interesting to watch your adventures trying to fix all of this broken hardware. Your narrative feels like story telling, really good.
So, if you turn a pot too much, then kiloohms turn into killerohms and kill the laser :)
i hope there’s a part 2 this was really interesting
Your tenacious approach to fixing, or attempting to fix things is fantastic.
An easy test for laser activity Vince..
pop a sheet of tissue paper over the laser which means you can look at it without risking your eyes...plus the paper will diffuse the laser light and illuminate (assuming usually red for CD) if the laser is functioning.
rgds
Evan
“It’s not worth dying over a Dreamcast.” Great line.
CheatingSoi He's wrong though haha!
Oh you bet it's worth it
What about a Dreamcast 2?
Oh it's worth every breath if you can get it working
Dreamcast 2 aka Xbox.
Thanks Vince. You prove again that you would go further than I would, I would have written it off as a bad laser but you proved it to be a fault on the board. I must learn to dig deeper when fault finding. I love your videos but one thing that really bugs me, and this should be taken as advice and not a put down is that when you say "killer ohms" it should be "kilo ohms". Keep up the good work.
Another interesting video, I have always had an interest in electronics, but never gained any general knowledge, with these videos I'm learning a lot.
I like your curiosity approach to fixing stuff.
This is why having a 3d printer to create broken and missing parts makes this job so much better. A lot of people create the parts and share them online
In case you need ribbon cables, you can find them in old CD-ROM's and usually they fit in consoles that have optical unit. Great video as always
Best thing about the Dreamcast Vince not sure if anybody has mentioned yet but the ability to play copied games was a huge plus! Saved so much money! Soldier of Fortune great game for the Sega Dreamcast!
Older video but I appreciate how you post your failures as well as your successes. Well, not ever really a failure when you get to learn but you know what I mean. A lot of other channels will only post what they've successfully fixed and that's a bit disingenuous, IMO.
Anyway, I hope you had better luck with this since.
I really admire your persistence Vince!
mate you have the patience of an absolute saint. awesome work again dude.
Not sure if this was mentioned by anyone else but you can't do ESR readings with caps still on the board. Other devices like inductors and what not will affect the reading. You would have to remove a pin or remove the cap to do the test properly. Same thing with doing resistance readings as well. Which is why testing for voltages is your best friend.
Eventhough it was a fail to fix video I really enjoyed every minute of it thanks vince come back to it when you got time
Thank you :-)
These videos are fascinating! Keep 'em coming!!
I've worked on many of the North American models. I'm 19 turning 20, I'm from the US and I absolutely love them!
I still really love the Dreamcast even though it failed when the PS2 released, but nice work on the Dreamcast Vince!
I love your fix it videos!
Wasn’t just the PS2. It was part of it yes but after. Biggest was money. Just wasn’t getting back what they were spending making it etc. still a good system though.
your right. :)
You can buy RGB cables, composite cables, and VGA cables (or make your own like I did). As the laser diode ages it starts to weaken to the point it cannot read a disc. Some people tweak the laser voltage using the potentiometer on the drive PCB but if that works it wont last long. You are better trying to replace the laser unit completely. The best way to adjust the laser voltage is with an oscilloscope - probe the RF pad and adjust based on the eye pattern displayed. You can see an example of how to do that in some of the CD system repairs I've done (PC Engine CD-ROM, Amiga CD-32, Saturn, PS1 etc). The big problem with the Dreamcast is there are few 'new old stock' lasers left I think. You can fit an "SD Card" drive emulator into these too - to replace the drive with an SD card.
Suprising you found that it appears the original laser is OK! That's quite rare! I would be looking at the SMD caps next on the drive controller board. It could also be a fault with the BTL / H-bridge driver chip - maybe focus or tracking related. The caps on the drive PCB are electrolytics (just surface mounted) - so your replacements would work. The voltage rating won't affect anything as you say (as longer as they are higher voltage rather than lower). Worth getting some molycot onto the gears and mechanical parts on these - they really grind away when they get dry.
The other thing I would point out is (and this is only advice - everyone has different ways of doing things, its just my opinion!) - Don't solder chips like that with hot air - use hot air to remove it, then clean the pads up with braid on the PCB, then put the new chip on there (if its an old replacement chip, use braid and flux on the underside of the legs first to remove any solder on the legs), then position it, use the soldering iron to 'tag' diagonally opposite corners. Inspect the chip placement to make sure its the right way around and all pins aligned. Then use some good flux (chip qwik) and drag solder manually. You would get better connections that way! Very interesting to see that the chip worked OK on the 'working unit' though - that rules that out.
When it was trying to spin it sounded incredibly noisey to me - I would be inspecting / lubricating the gears and stuff, maybe swap out the motor to see if that has a relation to the problem too. Sorry I've posted pages of text here lol. The point where the drive is hitting the edge over and over - looks like you found the switch wasn't working there? That is critical so the drive logic knows its at the start of the disc. Did you check all your cap connections were OK, and that the replacement ribbon was OK too at that point?
The component that you didn't know what it was (silver cylindrical with 2 pins) is a crystal.
The reason adjusting the laser isn't really a nice fix is if you have to move it by more than a few %, that proves the laser is actually dieing. Typically a laser will output its optimum value for 90% of its life and then gradually drop, increasing the voltage overdrives it to output at 100% again, which means its life will shorten as a result as it gradually drops even faster to a point where it won't read again. If you needed to adjust a very small amount (eg. by less than 5%), you may get a few years out of it. It's frustrating when people 'tweak' these though and then sell them on as 100% working, because they just won't last.
No need to apologise Chris, pages of text means plenty of info so that is good. I should be apologising for the length of the video but this failed fix went on and on and on. I thought I did the caps OK but maybe when I was removing the surface mount ones I might have damaged a pad. Pretty sure the ribbon cable was fully pushed in. I might dig this Dreamcast out again as this video was actually done a couple of months ago and check it over again. I had an interesting message from hespelf, here it is
"Hey Vince, I believe you really need to test and swap the OTI-9220 chip, which is the big square chip at the back of the board where you did replace caps.This chip is actually the GD-ROM controller itself. It does control spinning, tracking and focus among other things."
This could be the problem. I had a quick look on Google for the OTI chip and didn't find any for sale but I only looked for a couple of minutes.
I didn't check the SMD caps on the drive board. I haven't heard of Molycot but if it works on various different plastic gears then I will get some. The old 1979 BigTrak that I got working in another video could use some of that as well :-)
With the drag soldering I did have a little bit of practice on the PS4 from hell so in future I will try and get more used to it :-)
After the advice you gave on the MegaJoy2000 (N64 controller with the NES games) I now recognise that component as a crystal. Thanks for the advice on the laser, I thought it may be a short term fix.
I think I will revisit this one :-)
Cheers for the help and tips.
@@Mymatevince
rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F253726296640
Better than gdrom more cost effective than getting a working replacement gdrom drive
The device listed above plugs directly into where the gdrom plugs in
This allows you to get your broken dreamcast up and running without a working gdrom
Looks great but the price is really high. I will do some research into it as a lot of comments have mentioned it. Thanks for the link :-)
@@Mymatevince absolutely no worries bud item well worth it keep up awesome content
Hey Vince, I believe you really need to test and swap the OTI-9220 chip, which is the big square chip at the back of the board where you did replace caps.
This chip is actually the GD-ROM controller itself. It does control spinning, tracking and focus among other things.
Oh OK, I looked online but I couldn't find any information. Maybe I can revisit this one again if I can get hold of one of them OTI chips. Thanks for sharing this info, after spending so much time on this it would be nice to get it working :-)
My worry would be that if I take the chip from the good CEX dreamcast and then damage the chip and I can't buy a replacement then I would be left with 2 faulty Dreamcasts. I changed the chip on the video because I knew you could buy them really cheaply online :-)
@@Mymatevince You can also oversolder OTI legs, sometimes its 1-2 leg with bad conection (have got lucky few times). But it is likely Hespelf is right and that damn chip is faulty.
@@Mymatevince Isn't the CEX one under warranty ;-) ;-) I'm sure no one there watches youtube j.k
@@jmarynicz Just what I was thinking! Whack the knackered board in and take it back for a replacement, cex probably bought it for £5 anyway lol ;)
I am really enjoying this video, have not reached the end yet, but those capacitors that were removed were Surface mount electric capacitors.
Wow dreamcasts are loud !
I'm not sure about the dreamcast, but in optical disc based systems, when the drive doesn't seem to work, it's almost always the laser which is at fault.
More modern drives won't spin the disc until the laser has focus on it, which usually causes people to assume the motor is at fault when it's the laser. The motor is easy to test and pretty much never fails anyway !
One thing I do know about the dreamcast however, is that the controllers are not "hot-swappable" !
This means that they should not be plugged in / plugged out while the dreamcast system is turned on , it can do damage to the controller and the dreamcast ! So always be sure to have the system turned off before change controllers.
Great video as alway Vince ! :)
Thank you for the tip :-)
if you ever need to look directly at the laser light in the future and your worried about what it might do to your eyes you can use your phone's camera to view the laser because it can't reproduce the exact wavelength of the laser.
I will be sure to remember this.
You can use any digital camera to look at the infra red laser because it is near infra red. You can also see the infrared from your TV remote.
Vince desperately needs to learn how to edit. ALL his videos are waaaaaaaaaaaaaaaaaaaay too long.
or get special laser operating googles. They are a thing and come with specialist and high power hobby handheld lasers
@@SDMF5000 but thats good more content to enjoy
Ofcourse this was entertaining to watch, I know nothing about fixing things but i love to watch it.
Always if you post a trying to FIX video, in the beginning of those video's i'm full of excitement, is he gonna fix it this time ? And if not i'm like " Ooh, at least we learned something about it :D So, yes even if it is a "Fail", for me it's still entertaining.
It was a valiant effort, you can't beat them all. I'm sure you still got some knowledge from it.
You cannot do resistance checks with power to the circuit. It will throw all the readings off.
@Brandon Kick If you are testing individual component resistance than I believe you would be correct. I have never checked/set laser pots, but I do know whenever there is power to the system this will throw off the DVOM's reference voltage it uses to check resistance.
I was thinking that the entire time he was doing that
Love the show vince. True though: Always turn off to test resistance. The multimeter will test resistance by feeding a small current through the circuit. This current and any current coming from the dreamcast will interact. Not only will the reading be wrong but you could potentially also damage the dreamcast.
Hopefully he sees this comment/thread.....Liked.
It's almost impossible to do resistance checks with the part in circuit as external components will affect the readings. Parallel resistances !!! However the potentiometer readings he had from the Internet were probably taken with the pot in circuit so although not accurate to the individual pot we're usable for reference in circuit measurement only.
I've got 5 Dreamcasts. But then again i am a SEGA nut. Brilliant console way ahead of its time. Hope you get a fix for it M8. 👍
really enjoyed the video m8. As always great job.
every time i watch one of vince's vids i feel like watching another episode of hyouka.
I'm amazed you didnt immediately thing something was wrong when you heard that working unit fire up its disc drive. Those Dreamcasts have one of the loudest I've ever heard. Its like the worlds largest zipper being furiously dragged up and down. I still have the one I bought in 2000 or 2001 and it, despite the odds, still works great.
I grew up with a Sega Saturn. They have a completely silent disc drive, and with no system fan, the Saturn is completely silent when in use.
I'm very suprised that their very next system was so loud !
That cylinder component about 1 hour and 5 min into the video is a crystal for timing. On the other board it had a surface mount one fitted so that could cause problems if faulty also heat affects the value if faulty . If you have Hz or FREQ symbol on the multimeter you might be able to read the value. Falling that you could give chris a bell he's pretty clued up with type of thing. Good luck with the repair 👍🏻
I find your logic when troubleshooting very similar to my own thinking, very entertaining to watch for some reason! It does however baffle me when you get stuck on an idea that has no reasoning to it whatsoever and I think you even know yourself that its a lost leader but continue with it anyway. Perfect example was your playing with the lid switch at the beginning of this one, you know its not going to have an effect how much you press it as its either working or it isn't (on or off) which you prove in seconds but then stay faffing with it for another 5 -10 mins for no reason, these vids could be a lot shorter and easier to watch if you took out these moments... just my 2 cents! keep up the great vids matey :)
not necessarilly bad.
it only adds to the interaction
between audience and entertainment imo.
longer video to sit through and enjoy a sandwitch.
A very interesting video! just a few things in case you fancy doing a dreamcast again :D
The capacitors you removed are surface mounted electrolytic, replacing them with through hole radial electrolytic is fine it's just a little ugly in comparison but if it works it works, make sure to never plug in a dreamcast controller whilst the system is turned on, it has a high tendency to either break the controller or break the dreamcasts port board by blowing it's capacitors (or the resistors in the controller). If you ever come across dreamcasts that are listed as turns itself off after a while thats another very common fault, when the system gets hot the metal pins connecting the power supply to the motherboard expand and short out, they also often get corroded or dirty so you just need to polish them, re-tension the clasps on the connector and bend the pins back gently towards the rear of the console.
As for GD-rom drives they are notoriously fickle and spares are unavailable as they only ever got used in dreamcasts and the sega naomi arcade machine, typically it's the laser that dies so its very odd to have the drive board be faulty, I'd be interested in you installing the ISO loading drive replacement devices though.
Thanks for all the tips. I just Googled the ISO loading drive replacement and the very quick look I had was showing them for sale at £70ish. I will have another look later to see if cheaper alternatives are available on eBay :-)
There is a fuse that can pop if you connect a controller while it is on, but it is definitely replacable. As a matter of fact, resetable fuses exist. When those "pop", you can turn off and on the Dreamcast and it has reset itself, so it doesn't need replacing.
@@Dan-TechAndMusic certainly best not to have to fix this problem if you don't cause it in the first place :D
i was cringing when he was replacing those caps with different type... when you get to Amiga's please make sure you replace the caps right or u have whole community after you ! ha
That's the dumbest design flaw I've ever heard.
The nostalgia! THS NOSTALGIA!! I still have my dreamcast, the very first consol i had snd dtill love it till this day, the only severe fault with it ive had was myself
I love watching you try to fix these sorts of devices. I think it'd be a hell of a video for you to pick up a nitro RC off eBay and get *that* running again.
Don't tempt me...I love RC stuff. The noise of the Nitro would get me in trouble with the wife and the neighbours though :-)
@@Mymatevince Unexpected reply, but hah, nice to bump into another RC nut. Hmm, perhaps you can find a suitable bash spot to run them that won't piss anyone off? Maybe a friend that's got access to a farmer's unused field or a football pitch that would allow it? Hell, if there wasn't an oversized mud puddle in the way I'd even offer up my own yard for it, I run my own there all the time(IN fact I ran two of them just yesterday) and I'm rural enough that nobody gets annoyed by the racket. I would suggest tinkering with electric RCs but it really wouldn't make a very interesting video if one of them is bought broken and resuscitated like it would coaxing an old engine back into life.
Anyway, keep up the awesome repair vids. I love seeing things get fixed that most people would just discard and replace.
When it comes to the dreamcast and reading disks, I think one of the tips you can employ is checking the settings and seeing if auto start is on.
it may actually save you (or anyone) a lot of headaches.
IF auto start is OFF then the game won't auto load when you're in the dreamcast main menu (or when the system is powered on)
I believe this also stops the disc from spinning AFTER the " please wait reading disc" message although I could be wrong.
Louis Rossmann is a good go-to guy to watch for micro-soldering and he uses a micro-soldering pencil for touching up small solder joints :) they also sell "hot tweezers" for taking off small resistors and capacitors.
I thought the fridge repair was interesting but this is the best video of the year, so much excitement and action!
Easy fix mate! Replace case with an aftermarket one. Then replace the GDROM drive with a memory card reader. Problem solved!
Oh and while your at it, replace the power supply with the new smaller and better aftermarket one that just came out. And desolder the battery with a replaceable slot and add a fuse the left wire, to use non-recharble watch batteries.
That postage thing reminds me of the time I bought my typewriter for 30$ with free shipping, the guy paid 40+$ on shipping so the guy I bought it from pretty much lost money
Lmaoooo
Another really good fix it video vince....... im really enjoying your channel .......thankyou for taking the time and sharing... i find all your videos interesting and entertaining....
Thank you, the adjustment of the poti. corrected my laser and it worked!!
Another great video from another great Legend with a special loving care for the device Dreamcast but it's failed miserably
Hoped right till the end you were going to fix this🥺
The reason the disc stops is because the CPU is not receiving days from the laser so it defaults to motor stop. Since the laser is good the problem must lie in the coding/encoding bitstream and nothing to do with the motor speed.
There are several mods that can be done on the Dreamcast, one of them being an SD card reader in place of the GD-ROM drive. Keep it for yourself and replace the GD-ROM with an SD card reader. You can also replace the stock fan with a high performance fan, as well as other case mods.
Bingo! That's what I'd do with it!
so does the SD card reader enable you to download the games online to the card to play anything?
@@Longrange1116
Yes. I believe you can use GDI files as well as CDI.
Simply plop them on the card and put them in the system and you're good to go :)
@@Longrange1116 yeah you can use .GDI or .CDI files but you need to format the card as FAT32 and the folders have to be named like music tracks "01 ; 02 ; 03 ; etc." and the disc image files have to conform to the legacy 8.3 file naming scheme to properly boot. add the games you want and then use folder 01 for the GD EMU boot disc and from there you can select and pick the games with names/album art you want to play.
You have a working unit -- that is great. Get a cup of tea, notepad and Fluke and begin taking measurements on both units, and write them down. When you find different readings, investigate. When you have no schematics or test point data, this technique really helps to find a next step. Cheers
Hellz yeah! Thanks for letting us be part of this process :) I also enjoyed your ebay GAME GEAR and PS4 repairs. Great stuff!
Died a little inside watching this in 2019 after hearing "I think it looks ok" @ 1:22:19 when the 4th pin from the right moves. -_-
I saw that too
I thought the same thing. In fact there was another one before that. And Vince did no continuity test. At least not what he showed us
I spent 59 minutes telling my girlfriend that Vince had to change the drive. New SD Card mods are awesome.
That is dedication though systematic dismantling and reassembling to fault find.
Im glad your doing a dreamcast, you can use av cables which is far better quality and it has dialup internet but can be upgraded to a broadband which was only available in japan and maybe the u.s.
Great vid kept me entertained for an hour and a half ,I have still got my original Dreamcast still works as well.
Funnily enough I've fixed a Dreamcast that had the exact same issue, I just replaced the gdrom board with a spare though so I never really
bothered to fault find it.. I wonder what causes them to go bad. Congrats on fixing it though, Dreamcasts are neat little game consoles!
Haven't tested myself with an actual CD-ROM/DVD-ROM laser BUT with an optic fiber you can check the light using the camera of your smartphone.
It's a nice trick which I use from time to time when connecting servers for a fibre card.
Hi Vince great video nobody can say that you give up easily
First to say 👋 just wanted to say I really enjoy your videos and keep up the great work.
I just noticed something. I'm not sure if it's like that on the Dreamcast laser too, but usually with potentiometers, the two pads that are close together on the same side, are the right and the left side of the wiper You're moving while turning the pot and the single padis connected to the wiper itself. So to take any meaningful measurements where you see changes, you measure between the right side or left side of the wiper and the wiper itself.
Yesss! Laundry folding and My Mate Vince!
Just wanted to comment Vince regarding the capacitor values. You highlight the value being the same but the voltage not mattering as long as same or higher. That’s not true, you can get away with a small increase in voltage value but you need to be able to charge the dielectric plates, and if the value is too high which 6.3v to 25v is the capacitor will not work correctly. Also when measuring capacitors, remove them from the board otherwise you are measuring the capacitance of the circuit not the capacitor itself. Hope that’s helpful. Additionally, those capacitors you removed from the board are SMD electrolytics same as the discrete ones but smaller 👍 the component which you pointed to at the end of the video is a crystal, used for clock pulse for timing. You would need an oscilloscope to check it for the sine wave.
As long as the laser is good which you proved, buy another broken Dreamcast for a few Pounds most of the failures are indeed the laser. Not the board on the drive. Then the boards. Much cheaper than a new board even if they sold them. A pretty rare failure. I used to replace many laser for people when they were cheaper and Dreamcasts had more value. Definitely get a Scart cable at the least, VGA is also great but more expensive .
Nice and very patient work. Love the way the desk gets messier and messier as the vid goes on. A bit like my kitchen table lol. I don't own a Dreamcast and no expert on lasers but, fwiw, I think you were on the right track. Maybe need to seat that chip down properly by taking it of, wicking the solder off the pads, seating the chip flat and trying again by drag soldering it. Maybe just wait for the new chip to be sure as you don't want to damage the pads. It looks to me like when you changed the chip the behavior changed radically. Maybe one of the pins was linked to the endstop switch and isn't now connected so it doesn't realize it has hit the end? You lost nothing changing the caps. They were on the way out anyway and would have eventually damaged the board by leaking electrolyte which can eat through traces. Keep it up and don't throw it across the room .... yet lol ;)
Thanks, I will need to have another look at this Dreamcast as since the video a viewer mentioned that one of the legs was loose on the chip I did :-)
Hey vince, just a heads up, use cut led leads attached to the alligator clips for more accurate esr readin. When you add legnth to the cable you add resistance.
When you wanted to change the chips around I was thinking it’s a bad idea. Just be happy you have 1 working Dreamcast. If it ain’t broke then don’t fix it. Just asking for trouble.
I've only ever had about two 240 volt electric shocks that I can remember. One of them was with a Dream Cast
I played Sega Virtua Tennis on this Console for a few years back in the day. I don't like sports or Tennis, but this game was a masterpiece of the time and very addictive. You must give it a try if you are going to keep that system. Better with 2 players though.
You're perseverance is nothing short of amazing. There was a girl on youtube who did extensive bluray drive diagnostic with oscilloscopes to actually see why the laser would fail to focus/read/whatever, I wish I could give you the link. It seems you just need that to climb that final stair, you were so close. Maybe later.
You know what you have to do now... Swap every chip :)
Hey Vince, you can try to remove the disc drive and replace it with an SD card reader and do re-visit video! Love your content, thank you!
I had the same problem back in the golden days. I even replaced BA ship but didn't solve the problem. By watching this video was hoping to know at least what caused the problem back then .waiting for part2
I stayed with you all the way on this, sorry you didn't fix it, but I'm hoping you will receive more info that will lead to part 2
I had a similar problem on a ps one I brought off eBay. Lucky for me just putting my soldering iron on each leg of the BA chip seemed to fix it.
I know this is ancient history now, but if you still have both GDROM boards you could run through and get diode readings from the good board (positive to a ground point, and negative probe to test points) and then compare these to readings from the bad board to scope down where the problem is. I was hoping you were going to get to the bottom of it!
Did you ever revisit this, Vince? 1.5hrs of my life gone and it’s still broken!!! I need closure 😩
At around 51:15 in the video you read what should be 12 volts actually at 14 volts, A voltage like that indicates the supply is not loaded, mind you the Laser module was not installed and thus perhaps not loading what you were measuring..
And yes a low or high voltage can lead to a fault.. Eg: A short or partial short will have the voltage drop, whilst a higher voltage indicates a circuit or module that is not loading the supply or voltage feed.
Hi Vince, I know this video has been out there 11 months or so and you may have had this suggested before. Have you considered buying yourself a lab/workbench isolation transformer? it would make things far safer for you when you have items in bits with 230V going in. also you can use them although its not the true purpose to lower mains to 100v or so when testing imported products from us etc. Just thought I'd mention it enjoying the vids all the best Sean
Dreamcast does have online play and servers are even still up today to play Dreamcast online. There is a simple to put together device called the Dreampi that lets you play Dreamcast online using modern internet connection. Dreamcast also supports 480p video over VGA so video quality is pretty high, you don't want to use a cheap RF video cable.
Dude you are awesome, 1.33 and still wanting to see if you manage to fix it, means a lot of the good content.
"Right, although this sounds like a silly thing to do, I've looked online..."
Any lazer in any device is 90% the problem...it goes blind... good video, Regards Mark
Well you have a very good spares unit at least. You know the main board, PSU and laser assembly are all good, some of the plastics are in good nick and there's a working controller. Not to mention a good basis for a GDEMU mod. Well worth the 18 quid I'd say, even if you did blow 2 days getting to that point lol.
Outrageous delivery price! Royal Mail must charge a premium to the wealthy people who live in Ascot
Morning
Thanks for this precise video about this mytic system.
Yours Faithfully
Vince - try bridging the lid switch to always closed and see what happens. The lid switch not making proper contact (due to grime build up) is the cause of a lot of problems similar to this. The solution is to take the switch apart and clean it.
This video has more twists than season seven of Game of Thrones O.o
Love your videos mate, nice work!
i am going to recommend for older electronics that you use proper ESD protection. modern electronics are fairly immune to it, but older stuff is not.
I would recommend getting a PO box (not sure what they call it in the UK) for fans to donate you small electronics to fix.
Yea would definitely ship off a original xbox I picked up missing its screws and it lights to line its working but outputs no video
Love your videos even if my girlfriend thinks I’m weird watching you fix things 😂
Hi. When you put that chip onto the 'bad' board, make sure that you cleaned the flux off completely. I built a kit with some surface mount components recently, and until the flux was cleaned off completely, the board I built did not work. Just a thought.
Check to see if the wires hooked up to the switch that control the laser movement is broken. If you need any parts vince I have plenty. I have been doing video game system repair since 2001.
That silver cylinder you point to at the end might be a quartz oscillator crystal. It could of possibly blown out. Try swapping them and see if they work.
i think that's what it is, because thats how it controls everything, the motor and the frequency of the laser, it's all from that crystal
In interested in that to because he paid no attention to it. VINCE WE NEED A REVISIT!! your in quarantine nows the time.
Get that silver cylinder tester or swap it out from the working dreamcast.
I’m watching this also three years later and the cylinder “crystal oscillator” at time stamp 1.04:56 near c126 is attached at two points and on the other board time stamp 1.04:47 near c126 black rectangular chip is attached at four points . I bet that “cylinder” crystal oscillator was put in in an attempt to repair it and it is wrong. If I recall the board with the rectangular black chip at c126 is the new working one. You might as well swap that if you still have them. Good luck