I have been a Electronics Technician for over 35 years, I would put a jumper wire on the copper foil instead of a blob of solder. But none the less the butcher that worked on it before should get into another line work,. Nice videos Peter I enjoy watching your work. Thank you.

What an absolute beautiful job. It is great to watch a master at work.

Nice work Peter just shows you a small error connecting to a power supply can damage a radio at least it wasn’t permanently damaged.. I’ve got a ft817 I use portable brilliant little radio….. I always enjoy watch your repair videos👍👍👍

Peter, thank you for the great video and kudos on your methodical troubleshooting of the problem. The owner was lucky to have taken the radio to you.

Thank you for sticking us right in your way and making that job more difficult for yourself. It’s therapeutic

Love to watch that heat flow, when you are soldering!! Peter you plan that perfectly !! Outstanding Fix !!

Excellent job as usual Peter, maybe the previous "repairer" used a gas torch & 6 inch nail to solder with ☺. They certainly made a horrible mess.

Strange that the previous repairer should miss such an obvious issue in that area. Good repair though my friend 👍

Always enjoy your work, top notch.

Good job peter and thx for sharing with us. Really nice seeing those common repairs too

I own an 817. Small and portable. I take it when free on weekends. Great video!

Excellence as usual. So simply explained to me, who knows very little about electronics.👍

Nicely and neatly done as usual Peter. 20W on transmit?!!! The poor little 817 won't live long at that...

Allsome fix and great video capture. Master at his best

Wonderful piece of work. nice that it all went well again.

Thanks Peter for your time and effort you put in to your videos. Best regards from Carl.G0lka.

Excellent work. Professional.

That was a joy to watch sir 100% repair thank you for uploading it. 73

I made the exact same mistake 3-4 years ago. But instead of the simple problem your client had, my ft-817nd blew a transistor on the front panel instead. I tried to fix this but burned a trace and lost an smd capacitor in the process so I relented and sent the radio to be repaired by a professional. Haha. Thanks for the video, really enjoyed the repair.

Dip your solder wick in flux first. It will then suck up the solder much more completely. Made all the difference when I first started using solder wick.

Nice job Peter, and lucky not much was damaged due to polarity swap. Thanks, greets from Holland.

Fantastic job!

Good Job, thanks for sharing this repair.

Another good fix, thanks Peter.

Nice job Peter as always, thanks for sharing. 73

Ah, always verify the fault descriptions. Learned that the hard way, too. Especially at work.

Bravo ! Great job !

great video ,Paul,very nice explanation, on what you were looking attend how you trouble shoot, thank you for sharing.......73's N1inv

Good job Peter! Thanks.

Always enjoy your repairs. I think you sounded surprised that it was back in service so quickly! 73...Dan w4mnc

Engineers at the design department had probably added the safety 'fuse' just by the large capacitor. Well done.

Excellent video dear friend thank you..it also shows some operators have no respect for their own radio gear

Good job as always Peter.At the end of the video I was amazed at how much power was coming out of the little 817.I also noticed the voltage reading on the display was different to the 13.8 volts from your psu so definitely someone has gone into the service menu and god only knows what else has been messed with.😯73.Ian.G7HFS

Peter the person who owned the radio was very lucky that there wasn't much more serious damage another success my friend :)

What a bloody mess! Nice recovery Peter.

Great job👍

Good job on the repair Peter. I really hate working after other folks. Never know what you will find. 73

Thanks for the great video. Great job. This error happened to me too. It was caused by an unwanted short circuit at the input of the external power supply. The TCVR was powered up and running on an internal battery. This can happen quite easily in the field. Don't use Crocodile Electric Clips, but use proper connectors 🙂

Nice work!

Piece of simple advice from a Ham: If you laid down the money for a FT-817, when applying power to it, MAKE SURE the red wire is connected to batt + and black wire to batt - !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! It amazes me sometimes the things we see.

Fantastic radio, i love to use it... with the inside battery. :)

Hi Peter another intersting video, I remember back in the early CB day a so called Tech had those same lack of skills he damaged more than he repaired :-(

Great work and repair! I hate how small all this SMT technology is. I'm not very good at it yet but getting there with more practice and patience!

Nice repair peter big thumbs up 👍

Good job! ,lucky customer.

Awesome video! Enjoyed watching. 73s to you, my friend.

good job peter is very interresting good day of you

I always enjoy your videos. What kind of setup do you have for the microscope?

Say Peter on my Chrysler car I am going to try to repair the Bluetooth module so my wife can use her phone in the car. This radio is fairly easy to test by seeing it's reception decibel and or transmit. The module has a standard USB power supply so I will attempt the fix then see if my wife's phone will pair with it for the test while it is removed from the vehicle. I wondered if you had repaired items like this. The problem for me is no schematic is available and will have to noodle it. Thanks for your videos.

Good job Peter.I wish people would take better care of there radio equipment. Love your KZfaq video's.73 Andy G6OHM.

Very nice Peter, thanks for sharing. 73s de IW0HEX Pasquale.

Great stuff Peter. Just used your info to do this repair for a friend. Thank you! How did you manage to display "15m FT8" (21:37). Steve G4EDG

A little varistor with a 1n5403 (opposite) diode, can save the owner next time ...thank you to share your experience with us. '73

Exactly this foil burned out of my 817after an unatented reverse polarity. If i let me a notes : in transmit, the voltage drop 2100 mV on the pre-filters, inductors including the dc-jack, and a foil traces. This can be observed another 817's.

I own a Yaesu FT-817ND myself and was very interested to see what was inside to cause this problem. When you showed the closeup of the board, I was aghast at what looked like someone had "butchered" the board. The point of the open in the trace appeared, to me, to be where someone had used way too much force with a soldering iron and removed that part of the trace that way...but whatever the cause, it was indeed open. One thing that concerned me a bit was after you cleaned the board, removed extra solder, and then proceeded to power it up, I was worried about several places where under your magnifier it appeared there were tiny balls of solder between a pad and the ground plane. Must not have been though since it worked so well. I am so happy to have found someone else in addition to "Mr. Carlson's Lab" that makes intelligent, thoughtful, and educational videos on electronics. Keep up the excellent work! Do you work on Vacuum Tube equipment as well? I have a love for old equipment that uses vacuum tubes and very much enjoy watching videos on restoring them. Again, keep up the excellent work!

I wouldn't want to go back to that radio shop if that's the quality of soldering he does. It worried me that I might connect an external battery with reverse polarity on my 817 and h/b radio. I use an FQP47P06 MOSFET for reverse polarity protection. It can't switch on with reverse voltage and there's very little voltage drop across it. Bill, G4GHB.

What a mess!!! I hate working on stuff that other people have had a go on. Missing screws, wrong fuses, even wrong valves (tubes - I'm English!). I even worked on a lighting dimmer pack that had a large area of copper track blown away because a fuse had been bridged with a bit of thick wire.

Great video Peter, But 20 watts output , Its a wonder the final PA isnt ruined at that wattage .

Thank you very much for make this video. It's really helpful. I always learn new thing from your videos. I'm newbie to ham radio and electronics. 73! 4S6MNJ

4 years on and I wonder if that PA is still alive? Nice work!

Great job....that microscope makes all the difference...

at 5:17 the diode beside the cap. have a bad joint ... it is the protection diode ... it could be damaged too and have a short .... another nice video ... keep the good work

I was just thinking the first guy who got it never even bothered to look at it…lol happens a lot that, they put it to one side, get busy, forget about it until they are my there’d by the owner then just throw it back at them…first attempt would of been the owner, failed then thought sod it, bite the bullet and pay for a professional fix.

it may "only be a 6 watt radio" but the efficiency of solid state xmtrs is maybe 50% so that's 12 watts or almost an amp and the RX demands almost an amp ( digital circuits are energy hogs) so now you have almost 2 amps going through the solder blob... and in FM mode that is 100% duty cycle.. so a good solid blob is just what you wanted ! as somebody else said, this radio wants a crow bar diode ! and a more careful owner.

I’ve seen you use Flux Off in the past after soldering. What are you using with the cotton swab to clean that mess up? Is it Flux Off, alcohol, or something else. Thank you for making these informative and interesting videos. - Phil

Peter, good work. It´s always cruel to see, what so called repair shops are doing and that they don´t find such faults, which can be located easily by using Ohm´s law...hi. But one comment: I would have taken a short piece of wire (AgCu) instead of the big solder blob.

Good video---please do a video of a 817 with a faulty ribbon cable that attaches from the main unit to the display

Not looking to do it on mine, but wonder how what they did to the innards to get 20W out of it?

I see this video was from 3 years ago. Have it been back to your Lab to replace the finals the user burned up after running the radio at 20 watts? Only a matter of time.

It looked like the solder at the top of D1085 was cracked. was that something that you noticed?

Miss connected mine to battery while talking...got away with it on 817 but ruined LDG Auto tuner! Don't talk while setting up!!

Hey Peter have you ever come across an ft-817 with screen missing digits. Some bright some dull? Great Video

Another case of "Look what the golden screwdriver has done!" Another great repair!! Peter, do you charge extra when people take it to a chop-shop and then they bring it to you to fix what the chop-shop did? The owner is very lucky, the 817 is a wonderful radio but it can be very expensive to repair!

Peter, Thx for the video. I was wondering what video microscope are you using?

excellent…… what about adding an diode at the interrupt track to protect from a reverse polarity?

A TINY bit of reverse engineering would do wonders here. I see a couple of excellent suggestions about adding components, and also saw in the video no apparent use of any methods of parts verification either before or after your obvious repair. I would HOPE that ALL the circuitry was given a thorough check for reverse polarity damage... etc. de KQ2E

Sehr interessant Peter. Ich nehme an der Vorgänger hatte vielleicht kein Mikroskop. Das ist aber inzwischen unverzichtbar, wenn man SMD-Bauteile bis 0204 oder sogar noch kleiner löten muss. Und die Augen werden auch nicht besser ;-) Freue mich auf weitere Videos von Dir in 2019 und bleib Gesund!

It appears that may have been a smaller bridge as shown to act as a fuse? I have this radio and love it. Great job!

My FT-817 is really old. I think I bought it in 2000 or 2001. The display just started flickering and there is a corresponding noise in the RX. The last time this happened I switched the LiPo switch to ON/OFF on the bottom and it seemed to stop (but not sure if that was the actual issue). A couple of days ago, it was doing the same thing on external power. I am thinking since it is intermittent that possibly an old cap is leaking or something similar. Have you come across this?

gute arbeit!

Weird. I bought one of those recently and after it came , i plugged it in tried to run on BUT THEN I SAW SOMETHING YOU SEE ONLY IN NIGHTMARES + - TERMINALS WERE SWITCHED I was really scared in that moment, so i unplugged it and switched the PSU leads, and FT817ND came to life. I mean wow, in Yaesu they improved it or something

Hello I have a similar failure mode on my 817nd. Do you do repairs for customers?

.... "I do not have time to fix it" ..... The sentence went on for sure. "..... bring it to Peter" ;-) On the other hand, it is also good that he did not fix it ..... who knows what else would have come out. Sometimes I would really like to know who offers such a service ..... Well done Peter, it would have surprised me if you had not got it healed again :-) 73 Bernd

20W, that might last for a few more seconds lol TNX 4 the video ! 73 N8AUM

Another great job done peter. Why do they mess with such small components they don't have the necessary skills to fix.

hi what do you use to clean the pcb? tks

I don't like the solder bridge for the main current path. A little copper wire would be appropriate at this point. But all in all nice video.

Nice job Peter..........................Berni

I am stunned the owner would have thought that turning up the power on the FT817ND to 20 watts was a good way to go for more power out, power is cheap as his next set of finals. I suspect it was the owner who had more to do with the radio being in the shop than just not putting the right polarity into the rig, no your limitations and it will be a cheaper way to live and it may even give you a longer life hi. Richard vk2ual

Good work on this burn victim, Peter. Sometimes i wish that the companies just put a diode and a microfuse with socket in there. For this QRP radio you can choose small values with tiny space, and were a talking about 3 cents. I don´t like the power jack style..kinda cheap.. But anyways, the radio is now looking good. 73 de Olaf

with that big blob of solder on the ground power input, if the radio is ever plugged back in the wrong polarity, it might blow way more farther since the blob of solder will never break now... I feel it's like replacing a fuse with a nail... also I find that strange that a shop would abandon repair for only a cut trace...

Looks like the previous shop soldered in parts with a Hot Axe.

yep understand , copper solder brain would be nice too I bet the previous repair shop didn't have a microscope to see SMD circuit , well done .

I don't understand, that there is no secure diode in the current path. Clean fix! 73

Hi Peter once again thanks for a great video as always worth from the learning perspective of mine. Though I realy would like you to have a look at mine Yaesu FT847 please. Kind regards PD2AHQ, The Hague

My first think when I see absolutely 0.000 A current - some trace in radio blowed up

What did they solder it with? Blacksmiths tools? What a bloody mess

Hi Peter, Another easy repair. Wonder why the other shop missed that break in the circuit. Another KZfaqr BBI would call that solder job chicken poop. 73 WB3BJU

Hello Peter, That burned out trace looked interesting. I believe it is the main ground line coming from the DC jack, and I expect it to be somewhat thick. Which it is, except for the point where it was burnt which was quite thin and in the shape of a plus (+) sign. That makes me think it was deliberately made that way to act as a fuse (stupid idea to make a PCB trace fuse, I know but that is what it seems). So, IMHO, rather than bridging it with a strong solder blob, it may have been a better idea to use a suitable rated SMD resetable PTC fuse in there? That way, if the owner does the same reverse voltage mistake again, it will be somewhat protected. Best regards from Ankara, Turkey, TA2AWX

19:44 the 334 is short to ground ?