REPAIR GUIDE - TurboExpress: Total capacitor replacement chart

[Red Ghost]

This chart needs to be a sticky!

I think it's in the works  (I asked about it at least)

[marshallh]

I'm fixing a TurboExpress for commision, which was completely dead. No video or sound. I used some capacitors I had laying around and did both the sound and video fixes. They did nothing.

I looked closer at the SMD caps and found that they were ALL leaking except for the three 100uF 16v bigger caps. You can tell because there is a yellowish coloring on the leads.

I didn't want to cram leaded caps in there, so I found SMD replacements from Digikey.

1   8   493-2088-1-ND   CAP 100UF 6.3V ELECT WX SMD      0   0.17000   $1.36
2   1   493-2118-1-ND   CAP 22UF 35V ELECT WX SMD      0   0.17000   $0.17
3   1   493-2083-1-ND   CAP 22UF 6.3V ELECT WX SMD      0   0.13000   $0.13
4   5   PCE3859CT-ND   CAP ELECT 33UF 6.3V VS SMD      0   0.15200   $0.76
5   1   493-2099-1-ND   CAP 10UF 16V ELECT WX SMD      0   0.13000   $0.13
6   5   PCE4643CT-ND   CAP ELECT 4.7UF 35V VS SMD      0   0.15400   $0.77
7   5   PCE4304CT-ND   CAP 4.7UF 50V ELECT VS BI-POLAR      0   0.28800   $1.44
8   3   493-2105-1-ND   CAP 100UF 16V ELECT WX SMD      0   0.17000   $0.51

The part number is the third column. The Panasonic resistors can only be ordered in sets of 5.

After replacing all these capacitors the TE booted right up, and was loud as heck.
I'm pretty sure everyone is going to need to replace all the capacitors eventually. The video fix and audio fix are bandaids at best.

The bad capacitors:


Fixed


These are the new ones. Hopefully you can't tell the difference, except for the one trace I lifted XD

[bacteria]

Ah, marshallh - decided to pop over here and dip your toes into the water from the BenHeck forum then?   

[marshallh]

Yeah, the TurboExpress is such a unique piece of machinery that I thought it was fitting the job got done right.

I'm already planning a CoreGrafx portable, with built-in flash cart. The addressing scheme seems to be pretty simple and no dirty tricks like the NES/SNES. Far off in the future, though. I might have more motivation if there's a demand for such a thing.

[bacteria]

Interesting project. No idea market for it, the consoles are expensive as you know; although the games are very good. Using a flashcard is a good idea, although of course most of the games (good ones) aren't that expensive. The TurboGrafx/PC-Engine games are one of my favourite platforms now; so I am looking forward to finishing my project.

[spenoza]

There is SO demand for this. Hell, I won't be a grad student forever. I intend to be employed full-time in the next year, and if you pull this off it'll be at the top of my wish list.

Yeah, the TurboExpress is such a unique piece of machinery that I thought it was fitting the job got done right.

I'm already planning a CoreGrafx portable, with built-in flash cart. The addressing scheme seems to be pretty simple and no dirty tricks like the NES/SNES. Far off in the future, though. I might have more motivation if there's a demand for such a thing.

[Custm42435]

Here's a chart of the caps on the Turbo Express I made. I'm not sure but I'm assuming that the JPN version is the same.

Hopefully this will make Express repair work for people a bit easier.

Please feel free to use it, but don't claim that this is yours or try to make money off it. That's not why this is here...

Special thanks go to Nat for adding some missing information

The bottom center cap under the metal shield is a 10uf 16v not a 100uf 6v.... cc704

[blueraven]

I just pulled all the caps off of my express and that one was a 100uf 6v.

[Custm42435]

I just pulled all the caps off of my express and that one was a 100uf 6v.

i meant the bottom center one... its a 10uf 16v not a 100uf 6v

[blueraven]

I thought you meant the center one, under the heat shield. You're right! 10uf 16v!

[Red Ghost]

I'll update the chart in the near future with that cap info. Thanks for catching it

[Red Ghost]

Ok, just updated the chart with the corrected cap. Thanks again Custm42435 for catching it 

It's a bit more zoomed in this time...doesn't quite fit on the page but you can scroll over... I'm not in the mood to work on it anymore at this time so I'm leaving it like this unless people really think it's an issue.

Enjoy!

[Red Ghost]

Just uploaded a totally new version of the cap chart. Better photo, better background, etc. Enjoy 

[esteban]

Rock on, this is nice as well. Good work.

[BlackandBlue]

Thanks, this is going to come in handy shortly... or whenever I actually get myself to start replacing the caps.  I opted for the radial type resistors, so hopefully I can squeeze them all in there.