I guess I'm extremely bored so I watch old videos. You are one superb technician. I really enjoy your videos. I think I learn something every time I watch. Thank you for the videos. I'm just an old retired technician. W Rusty Lane K9POW in eastern Tennessee

This is why I like watching TRX Peter doesn't give up easy. Good job Bravo!!

Please never change the way you make your videos. I love the clicking of pushing the button between each shot. You always stay calm and explain very slow and clear. This is really educational for people who are not an expert in electronics.

NOT a repair I would have attempted! So you have once again earned my great respect, Peter!

Another excellent video by peter a great learning experience and very enjoyable to watch. Great teacher Enjoy his videos. thanks Mike

It's not very often you get to see someone who can put the magic smoke back _into_ a piece of equipment! Impressive repair Peter. 🎯

Amazing Job Sir. Most would have just told the customer it needed a new board and if they could not afford it. Told to sell it as a parts radio. Amazing skill sir. Well done. 👍 73.

You fixed the radio....for crying out loud why would anyone thumbs down that ? What more could they do ? Excellent as always..

I love waking up to a video like yours and having my morning coffee,, Thanks for another fine video !!

These type of videos are truly inspirational. Thank you TRX Lab.

I'm no good at electronics, but I sure enjoy your expetise and ability to fix something instead of just replacing parts (ie circuit board). Thank You.

Great video as always! 73's Beautiful job with the new transistor. That's a work of art!

Again a great repair job by Peter ... He can be entrusted with repairing any radio ... hats off gentlemen ... 73s de DL6RDE/AA1KD, Karl-Heinz "Charlie"

Better than a new board. That was a really nice repair. Very complicated but the finished result was perfect. Always learn something new from you. Danke Peter.

Great job Peter. I'm always learning when I watch your videos.

great job peter as always

Well done Peter a excellent repair as usual and a great up beat video in plain English 👍 keep the videos coming mate.

Very neat and clean trouble shooting!!!👍📷

Great work Peter. Thank you for what you do here!

Great video and excellent repair, many thanks

I watched a lot of TRX Bench the last years. These videos really are electronic detective movies with always a good outcome. Told by a calm person. I really can sleep well to this videos and also learn something. Compliments

Thank you sir for another fantastic video and repair.

Another interesting repair Peter thanks for the video keep them coming.

Great repair Peter.

very2 clear dealing in the repair good upon the good in learning ,many thank from 9M2DU

Hi Peter. Tnx for another great video. Interesting as always.

Well done Peter, a great recovery from a big mess.

Hi, thank you for this very interesting post. I imagined changing an MCU to be much more difficult. I find your approach to error analysis (also in the other videos) super and very instructive! Many thanks for this. vy 73 Andreas, DL5LC

A great repair and carried out very professionally. The test equipment is very interesting also. Super video. Thanks for letting us all look in. 73 de GI8WFA and stay safe.

beautiful repair....... you do the repairs the factory would not do , that is why I love your videos . You truly are a master technician . That is a repair I would also attempt myself , though probably not as nice looking as yours hahaha. Many thanks.

Excellent repair video!!!

Nice repair Peter. Thanks for the video.

Bravo Peter!!!! Danke!

Hi Peter, good job. I have a little addition to setting the idle current process. It's in my opinion much better to do this in DIG (not PKT) mode than in SSB. DIG is the same thing as a SSB (LSB or USB, can be set somewhere in the menu), but the radio expects modulation from the 6-pin miniDIN socket on the back (which is in fact low impedance line input) EVEN if you press the PTT on the microphone. So if push the PTT on the microphone in the DIG mode and you have nothing connected to the 6-pin miniDIN socket, you are in fact transmitting in SSB mode with completely muted microphone, which makes setting the idle currents much easier and precise.

Nice a very well explained repair as usually peter. Its always a pleasure to have a sunday with one of your funny videos. Thx for your time, always learning something. Many comments and few likes, come on boys!!

Thank you, Peter. A great repair. NOQFT

Amazing Fix !!! Peter you have done it!!!!💎 👈🏻

Great and clear job!!! 🙂

Hi Peter it’s good to see your videos again I really definitely enjoy them. And you did a fantastic job on that 857, actually your repair job looks better than the factory I’m very muchly impressed. And how you are able to work with the SMD is phenomenal. Hello from the Texas hill country. 73 WD5ENH Steve

Fantastic again Peter!

great work 👍

I like seeing the innards on these radios. 👍

Another nice repair. I'm sure those new via's are better then original. That is a great little radio. Ten thumbs up!

peters back your the man

As usual an excellent video! I think the repair will be reliable, the PCB feed-through wires are as good as the original setup. Best 73's SEB

Great work Thank you

Nicely done, good repair ;-))

You always do such a great job tracing the event that caused the problem. You never assume a fix.

Has same problem 2 times.I soldered copper wires to restore the transition between the sides of the board. Like and good luck!

Very very good operation 👍

Glad you went ahead and fixed it. That radio is no longer in production and factory repair isn't really an option. 857D is my favorite "swiss army knife" radios of all time. Especially with a wide band collins filter.

another great video

Peter super repair Good Job you saved the customer alot of money as Yaesu wouldn't do that repair they would only sell you new board which would cost $700.00 or more maybe suscessful repair well done :)

good video and repair.

that is repair... not simply changing parts- that is ecology. GREAT JOB DONE!

Great job

Thanks good job

Once again a nice radio has been safed, good work indeed! I guess the cap shorted out, an the owner could be happy that the short stopped while burning. There was enough material left to give it a try, and you succeeded. Peter, may you plan to collect the charcoal from all the burned radios? You can get a nice diamond if you press it hard enough ;-) Just kidding. Nice video, good work. 73 de Olaf, möge der Sommer endlich kommen!

Fascinating ..

Welcome back Pete

Great job as usually dear Peter. I had the same problem with Icom 775's the PA final stage ; I rebuild with new PCB burned zone. As in your case, there was a loss between 13.8 volt and GND traces with a huge current between. I think this can happen with the PCB heat or humidity, I don't know exactly. Best 73s and thanks for sharing. Pasquale IW0HEX

Another great video, you mentioned free band, I didn’t know you had a VHF allocation for that in Germany de Mike

Another excellent repair Peter, yet another radio saved from an early grave 👍😀.

Awesome!

Hey Peter wie immer klasse ;-) wollte einfach mal wieder Tach sagen, biba 73 schönes Wochenend.

Nice job the best repair for a bad situation thanks. Too bad the board could not be re-created with all the technology of today.

Very nice video! Glad to see that you did not give up on that board! I worked in commercial comm back in the states for 20 years and was a dealer for Uniden commercial radios back in the day. They were fairly reliable however those little green caps on the final were always junk. As a habit we always replaced all caps around drivers and finals but to comply with warranty work we always sourced from Uniden. Is there an EU supplier for these caps? I have a first gen 857 ( not a D model) and it is probably equipped with same trouble makers. It might be worth my time to replace them as a preventative measure. I don't know if that final for the original 857 is available still, if not a ounce of prevention is better than junking the whole unit if that PA fails. A word of wisdom from past experience. Try to clean off as much of that carbon from the board and reseal the area with a high voltage corona dope. That carbon is conductive and can cause some issues. Take care and keep those videos coming!

Again a wonderful video Peter ! Some CB er on 446 PMR ?

Another good job from Peter…

Thanks for the video. I have learned so much from you. Have you ever fixed the zebra stripes that occur on the 857 display?

Great job Peter! Quick question - my radio has the 2SC3102 - should I be concerned with this part, or can I upgrade to the newer FET?

That's a great option. Smoke signals built in.

thank you

Very nice work Peter, hope your all okey.

I have an 857d thar recently started behaving strangely. The heat sink gets warm while sitting in receive, with a noticable higher noise floor. It was suggested that the PA relay may be stuck closed and there is PA idle current flowing. Is this something youve seen before?

Looks like my problem. Now to try and find the p/n for the replacement fuse.

Remove the screws before unsoldering transistor would help with the heat transfer to the heatsink while removing it. It will save the traces on the board.

Similar issue. Mine has has lost it's full 50w/20w vhf/uhf output as well but still puts out milliwatts. Had a slight burning smell just prior to failure. Any thoughts? 73

Mein Gott, das ist wie meine FT857D aber nicht gebratten ! :))) Peter hat noch einmal seine technisches wunder gemacht.

Hello, I was watching this again and was wondering if you have made a video on the FT857 that had lines going through the display ? I have 2 FT857's and one developed lines through it,,,, if you have done this could you reference the video number ,, Thank you Ron AC7RH

You are right about the factory would not repair this kind of problem. I work on somewhat similar aviation equipment. I could not get away with this kind of repair due to the nature of use. My own stuff I will and have. I knew that something else caused this failure. this is good education for all of us.

Great job once again Peter. It seems you don't need an audio generator at all as you can whistle nearly perfect sine tone ;)

Such a part of the burnt printed circuit board must be cut out with a cutter or dremel and the conductors must be restored. Otherwise, high-frequency voltage will constantly break through here. Good video. Like.👍

Thanks Peter, great video as always. I don't think my FT-817 has a Smoke Signal mode, at least not what I could find in the menus (which is probably just as well). I'll stick to CW as my lowest common denominator. 73, Jan Henkins - M7HNK

Awesome repair! Are you Belgian, by chance?

Very interesting repair Peter. Maybe a high SWR killed that output stage?

Hola Peter, tengo un FT-857D que calienta mucho en VHF & UHF con carga de 50 ohms independientemente de la potencia hay mas de 40 grados centigrados sobre el disipador, V/UHF Idling Current Adjustment seria una solucion? mil gracias!!! exelentes tus videos, saludos LU1DVH

hi Peter nice video and content as usual! IMHO I’m used to recover from bad shape vias or trough hole connection introducing a piece of copper bonding cable for one side to the other one and solder whenever possible the cable on the pads where the via comes out… I don’t know if you really get what I meant due to the poor explanation. By the way I really envy your deep knowledge and expertise! Keep on rocking

danke

@22:11 question for you. Would you have taken the time to remove the carbon from under the trace, then epoxy the trace to the undamaged part of the board. I am asking this question as I am watching the video so you might have already answered the question.

Good Job and happy radio owner, better than a surgeon.. i know sometimes it's not easy find a replacement part such as special cap for UHF, maybe a NPO cap can be used. What do you think about "short killer" device for you lab ?! Regards'73 .

Prima!

Hello, the RD70HVF1C is specified for 75 W in the datasheet which i would consider to be the effective power. How comes that you can reach 100 W with the device, is that peak to peak power displayed ?

i have the same radio .. it still works but i would love to get it fixed by trx bench if it ever broke

Good Job! I have one question. Why you don’t have removed all Carbon residue under the pad ? it is not necessary ?

Also...ich als deutschsprachiger freue mich ja das Du so langsam sprichst...so verstehe ich alles.Aber für nen Engländer muss das ja echt gruselig sein....Ich habe mir schon sehr viele Deiner Videos angesehen und bedanke mich auch für dieses recht herzlich

I would have liked to see the testing of the individual components that were questionable in this video; I know it would make it longer but I think it would also make a better training video, in order to make it more thorough as well, to make it more informative as well.

Pcs electronics keeps rd70 transistors on stock.

Mmmm, BBQ final; so hot the solder melted.

superglue the pad down, use a 1mm drill bit to clean the holes in the board