Peter it shows what damage leakage caps can do I have heard of stuff called contact paint that you can cover printed circuit tracts, I did notice as the crystal was heating up the Sin od was improving it is amazing what leakage caps can do well done for another great repair the PCB was in a great mess with the acid very much corrosive and just eats the copper away!
Thanks for doing this video. After watching it I decided to replace all of the electrolytic capacitors on both boards. The only leakage I found was underneath the 470uF capacitor on the display board. Fortunately it had only leaked a small amount and not yet eaten through the copper trace. I was able to clean the board and re tin the trace. If I hadn't watched your video and decided to replace the capacitors I would have had my radio fail before very much longer and the repairs would have been much more difficult.
Very well done, Peter! You also clean everything as meticulously as I do it. I even applied clearcoat afterwards. But surely you can overdo it ;-) And again, a TS-850 is on air ..... Thank you for always doing so much work and bringing all this to our view. 73 Bernd
Thank you Bernd! Well I'm not 100% satisfied with the cleaning I will go for ultrasonic cleaner even I have already uses soda lye. Additional to that I found a nice green pcb coat in china but still looking for a strong UV beam..73
Now fast track to 2022, I have a nice looking piece of metal on my shelf...Need 3 boards to fix it, but can't find any of them anywhere in the world....
Hi Peter you did this repair (#75 Dec 15, 2015), having looked at it again the board number are the same. The only thing I see is the date codes on the Kenwood IC are a year apart, IE: 9031 & 9140. I guess if you have not heard from the old man on that repair, then what you are doing solves the problem. Great repair as always i'm sure you will see this repair in your future again, *_Cheers_* *73*
Ah good one Tom! No nothing heard from the OM...Well I have seen some in between but normally do not ever repeat a repair I have already shown...When I started this repair I was hoping it is something different from the local board.... Thanks for your detective work! 73
Thank you very much for your teaching. Your videos are very useful to learn. I have a TS-850 and your information is very important to me. Thank you very much again.
If everything else fails: IW3AUT sells replacement boards with a new, single ASIC chip. Not really cheap, but it would save some otherwise really good radios. 73, dl5mhk
You have some of the coolest shirts! I had to watch since title says Mickey Mouse sound. I think that you have finally made up my mind for me to go ahead with trying to replace the finals in my Yaesu 3100. I've gotten all the screws out and now I'm at removing the main board. First I have to unsolder the SO-239 and get the board out of the way. Ran out of solder wick so I'll have to get some more before I can continue. I don't think I've ever seen so much damage from capacitors leaking electrolytic onto the board. How do you neutralize the acid??? Use soda diluted in water??? Bringen sie uns ein gross bier wieder bitte. Ich sehe siebsen unt ocht hertz. Haben sie einer gutter tag. Cheers & 73 from W Rusty Lane K9POW in eastern Tennessee
Thanks for posting. I have two of these 'gems', one with old, one with new DDS IC's. Both had leaking capacitors. The newer one still operates, but the damage caused by the electrolyte will eventually cause failure.... Both had display issues, because of, you guessed it, leaking capacitors..... 73
probably would have replaced caps with modern high value ceramics. no issues to get up to 100uF/16V and remove the leak possibility forever. otherwise great fixing!
Well yesyou can do that but new A brand caps will do the job. Most of the time when we find issues like this the manufacturer used cheap an crappy components even in this case it might be more a missproduction... Thanks for comment 73
Doing so much more of this lately. Leaky caps are really starting to become a major problem. I tell people it's better to replace all the electrolytic capacitors early before any damage happens. Better than doing it to late and your radio becoming a nice looking bookend. When I do these repairs I reapply PCB overcoat to the traces. Circuit Works makes a 2 part epoxy that is green for this. This is a really good high temp epoxy once fully cured and also works well to bond traces to the board if you ever have to replace a whole trace. You can also get UV light cured overcoat. I recently got a small tub of that and have had good luck with it so far.
You are so right Mike it is a nightmare....I have alredy found this green coat in china but what I'm still looking for is a string handy UV beam. It is in any case the right approach and I will do that as soon I have found the right tools for it.. Thanks for input 73
I hope major manufacturers by now are using better quality caps. Should be no excuse anymore for using cheap parts anywhere. Good work on the fix as always. 73 de KA2ZOH.
Hi Herbert well I believe especially this caps in this radio are a kind of misproduction but this is no excuse for all the cheap crap of electrolytic s we get these days in our radios...Thanks for comment 73
Really nice job cleaning up the damaged area of the pcb Peter. Have you ever tried using the pcb solder mask repair that is cured using UV light? I found that the UV curable pcb mask repair works really well...
@@TRXLab the "uv fingernail polish hardeners" are reasonably strong, inexpensive, and made to stand over flat areas. Also, air conditioning leak tests kits typically use a strong AC powered uv handheld lamp.
Hi :) I know you are super busy, and I know you don't respond to e-mails, but I have a simple question. If I wanted to replace my electrolytic capacitors on my TS850's CAR board, can I use something that will not leak in the future? Tantalum perhaps? Hybrid polymer? Is there anything you can recommend replacing them with that will not leak again in the future?
David, both is possible and it is up to you. Considering the age of the radio even normal electrolytic caps are fine since thy will at least last for another 20+ years...
Good to see it working Peter. Nice job on bringing her back to life. These are really a pain. I have spent many hours repairing the through holes by inserting short pieces of fine wire in them. Thanks for sharing.
I´ve done the same, I repaired all through connections with thin wire because the acid had eat the edges away. Furthermore, I have replaced all SMD electrolytic capacitors with wired ones. Because I had no others at hand. If that was correct? I do not know. But the Kenwood has been working with it for 3 years now. If it continues like this, it can not have been wrong ;-) 73´s Bernd
I've done some research on how to clean PCB's and I've seen several references to using an ultrasonic cleaner with some distilled water and maybe even a light detergent as a possible solution. Some of the pinball arcade guys seem to advocate putting PCB's into the dishwasher which seems odd; I don't know that I'd want to try that myself. I'm still researching as it would be nice to know the best way to clean these corroded boards. I seems like with enough information, a schematic, and board layout, it might be possible to get a completely new LO board manufactured.
Yes you are right for boards like this ultra sonic cleaner is a real advantage. Unfortunately we can not use it on all pcb as we can easily destroy a pcb with filter cans on it but for this local board it would be the best even I have already used soda lye to neutralize the acid. Thanks for watching my friend 73
I have one of these radios and it is stuck in transmit.(and throwing out power so it seems to have good finals). I will be saving this video to see if you cover anything that may be affecting my unit.
Great job Peter! Awesome instincts finding the bad via while you were inspecting it. You put your tool right on it! Did you use any alkaline to try and neutralize the acid while you cleaned, or just flush it with isopropyl alcohol?
Thank you Michael! I always clean it with different cleaners one is soda lye and off course isopropyl as well and a special pcb cleaner. Thanks for comment 73
Yet another ts850 with caps leaking....kudos on finding the bad spot with your pick....lots of these for sale around here but cant get a straight answer about these caps....so i have to assume they have already leaked out... Keep em coming as i am a huge fan of your meticulous skills... You and mike and buddy and paul carlson are all i watch 73 my friend Jeff WD8JM
Hi there Peter again. I wonder how many good radios have become scrap due to the same problem with leaking electrolytic caps. I know you can expect this from realy old radios that changing the caps and noisy resistors is part of the game. Surely though why would so many caps leak/ go faulty on a fairly modern type of radio ?. Would it have been a faulty batch in production ?. I would hate to think I had payed out good cash to find this happen to a piece of my gear. Thank's for another very interesting video of the repair, well done. 73 de John - G0WXU.
Hi John, yeah I believe a lot of radios have become scrap by leaking caps...For this 850 series I believe it is a miss-production but a lot of younger devices have simply cheap crap on board... Thanks for watching 73
Peter , wander if its possible that the acid vaporizes - to get it some distance from caps , maybe when operating in warm shack and radio heats up . Next time I dig into one of these , test for acid / alkali and then neutralize .
Well I don't think that the acids will vaporize I always neutralize it with soda lye but still not find the most efficient way to do it..Thanks for comment 73
Do you by any chance have a full list of the capacitors that need replacement in the TS-850S? I want to order them all from Mouser and be done with it. Thanks in advance!--73, K2UA
Nice video as usually but what's about to put whole board to some alkaline solution like soda bicarbonate for a few hours/days to neutralize acid. after that to distilled water for a few days and after that dry it and clean with alcohol.
Danke Peter, is that fiberglass pencil a readily purchased electronics supply item ? Where did you purchase it ? I might slip in some Deutsch again auch. J K
The fiberglass brush is available on Amazon. They are also referred to as "scratch pens ". They are available with different bristles.....brass, stainless steel, nylon and fiberglass. I sent Peter a question about it also, but then looked it up under fiberglass pencil and found several resources from $12 up. J K
Hi Peter, verry thanks for all your videos here. I am active ham radio from OE9. Peter, is it possible that i can send you my board from my ts-850 for repair (cleaning, exchange all the capasitors) for a longer live? I am not fit in soldering with smd parts and my transceiver ist in a verry good condition, so i will not loose them in a nearly future. I also want to pay your work financially. Please give me a answer, thanks.
Fine job , thumbs up Does the TS-790e have the same problems with the capacitors? I have a TS790 , which has no problems, I would then replace the capacitors as a precaution. vy 73 de Uli ( DK6DV )
Nice job Peter ! Really All TS-850S have this problem over time.I have seen some professionals replace these eletrolytic capacitors for tantalum capacitors. What's your assessment of this alternative?
Thank you Rene. Still recommending tantalum caps for signal paths only. I know that tantalum caps have improved a lot over the years but still not trust 100% so I avoid it where I can. Sometimes there is no other way but that will be the exception for me 73
That is not easy to answer as there are so many different capacitor qualities out there. As rule of thump you can say as more professional electronic gear is as better are the components. For example if you see test gear from HP or R&S and what have we see that caps will last for decades. On the other hand cheap consumer electronics from China only a year. For our radios you should check at latest after ten years and should at latest swap out after 30 years but only if you found no issue before..
Hi Patrick, still recommending tantalum caps for signal paths only. I know that tantalum caps have improved a lot over the years but still not trust 100% 73
Realtively simple get ther knackerd caps off wash the board in HOT SOAPY water rinse it of in HOT water blow it dry repair damge replace caps nothing difficult or maybe i just take this sort of thin =g in my stride and do the job .. HOT SOAPY WATER IS your friend Sorry but that is a LOUSey cleaning job . Sorry if i sound off but if you saw the state of som e of the computer booards i have had to repair that borad isa dream job
