Inspired by my still ongoing thread in this sub-forum, I took the time to document all of the electrolytic capacitors on this particular TG16. I don't know what revision it is offhand (if anyone knows how to tell let me know and I'll post it) but I've decided to post the values here in case they help someone else: 1uF 50v - C146, C141, C143, C144, C145, C147, C148, C149 10uF 16v - C113, C136, C142 22uF 16v - C101 22uF 25v - C3 - found on daughterboard w/power connector 47uF 16v - C140 100uF 16v - C132 100uF 25v - C129
Make sure you replace them with 105c versions. Also, might be worth putting in slightly higher voltage rated ones.
105c? I'm unfamiliar with this designation though Google seems to suggest it has something to do with 105°C ratings? Most of them did get swapped for higher voltages as I typically buy in bulk from China and get 50v as my normal minimum given its the highest voltage I usually see in the majority of consumer electronics. I've yet to try recapping a monitor. For the 1uF I only had 50v on hand but frankly I can't fathom why they used 50v capacitors in the first place. The power supply puts out 9v, the 7805 only seems to want to put out 4.5v and there isn't anything in sight that would remotely suggest the need for anything about 16v. Oddly there is a fuse rated 125v 2.5amp or so inside near the power input, likely to avoid lightening strikes and power surges? There is a lot about this particular TG16 that confuses the hell out of me. The board is silkscreened and prepped for multiple IC spaces that aren't populated. On other boards I've seen on forums the same spaces are just as unpopulated but lack the silkscreening and solder pads. I wouldn't be surprised if the whole thing wasn't over engineered, be interesting to see what the capacitor values are on later revisions.
105c is temp rating, as you found. cap generally come in 85 and 105c - higher is better for long term and the price difference is negligible.
Usually 105c are used on personal computers or power supply circuitry. On standard consumer electronics of the 80s capacitors rated for 85 degrees Celsius are perfectly acceptable. Also don't go too high on the capacitor voltages as they will have lower values while running on too low voltages. Again it's acceptable if it's EMI filtering/ power rail capacitors, but on audio circuitry it might have adverse effects ... :thumbsup:
My point is, for the extremely little price difference (at least over here), you might as well fit the better rated ones. I dont even bother buying 85c ones, as there is no price difference to speak of.
I was actually saying that you don't need to go out of your way to get "ultra high grade super hyper duper caps" for 1980s and 90s electronics if you can buy decent caps on the neighboring electronics shop. Just wanted to point that out... :thumbsup:
Yeah, there's little difference between the two temperature tolerances. The only reason people think you should get 105s is because of the whole dodgy formula thing - the better made capacitors then were usually 105s (and they were usually low ESR), so people just went for them. Sure, you can use 85s no problem, but likewise, you can fit 105s if you wish... but you don't HAVE to go with low ESR. I'd personally stick to the original voltage specifications, or as close as possible. What I'd avoid with capacitors is buying cheap, shitty brands (that may have been involved in the stolen formula thing) and buying loads in advance and sitting on them - capacitors have a limited shelf life regardless of whether they're being used or not. So you want to proceed with caution if you're buying in bulk from China - be sure you'll use that many, and be sure they're not one of the dodgy manufacturers!
There's two things funny about that stolen formula story: 1- It happened in 1998 or 1999 and it still plagues us today. That's sad. 2- A lot of misconceptions were created because of that. And to add to the injury, the affected capacitors were mostly the LOW ESR type used on PC motherboards, so yes, the ones affected were actually the capacitors rated for 105 degrees Celsius... :shrug:
Pretty much. When the price is the same, why risk it? I've replaced so many caps its not even funny and id rather not set myself up for it again in 3-4 years time. So I just use the better ones. There is no point making more work for yourself in the long run when they are practically the same price. Its the way I work - replace with best quality for the price and save yourself work in the long term. Unless you want repeat business i guess...
I rarely get repeat business on the same piece of hardware. Same with computer clientele when I was more apt to remove viruses. Some of the caps I used (after checking) were 105c but others were 80c. The TG16 in question performs exactly the same (complete with rolling contrast bar) so I'm not going to care too much and assume the console is at least running closer to spec extending its lifespan. At least until a capacitor really fails and nobody is around to check it out then trashes it. Le sigh. I don't know who the manufacturer is as these capacitors were bought blindly - for the most part. About 2/3rd were acquired through Digi-Key and I highly doubt they don't bother to do their research on such a well known problem. Despite the fact so many of us (at least those posting in this thread) are of pretty good enginering skill sets I kinda feel like making some basic guides are in order for the conservation section. I've seen such guides out there before but they always lack one piece of information or another that annoyed me to no end until I found my own answer. Interesting thought that...
