Troubleshooting no receive audio in a CB radio with no test equipment. 

I recently did the exact same diagnose to my brothers radio. New replacement speaker for $6.75 and thye job was done. Thanks for all the videos. Brad

Man you’re awesome for uploading these videos, thank you for wanting to share your knowledge and allowing future generations to learn these skills

Really love all your show and tell repair vids Mike, I would buy you a drink and have a chat with you any time.

Thank you so much - my Cobra GR25 LTD ST´s Speaker died today. Checked it and found nothing visible inside and on the Speaker. After your explanation at the Beginning of the Video about Circuitry you saved my Day. Thank you so much and wish you all the good Numbers.

Quick and to the point! Great tip Mike

Great stuff as always Mike!

The owner of this rig probably doesn't know how lucky he was. It might've gotten to a fake tech who would've charged him more for the repair than the rig is worth. It needs this. It needs that. Oh by the way it needs 10 of everything. We all know their out there. Good clip Mike. Thanks 73

Old Mike is forward and simple as it should be

Very nice video Mike.

I really do wlwctronics for some years now, but that's the first time I see such a screwdriver. It's that simple but a really genius solution

Just bought a Cobra 29lx from their Ebay store and there is no sound at all. Taking this to my electrician friend with this video in hand so he knows what to poke around in. Thanks

Thanks for the information. I have a cobra 45xlr with the same problem however there is no internal speaker. It's the AM/FM CB and you must connect external speakers. It does transmit and the audio is fantastic but It doesn't receive on CB or the broadcast bands. I'm going to open it up when I get time. I'm hoping to find something simple like a broken wire or bad connection. I would really like to get this rig working again.

thanks this really helped

Used to have a Cobra 148DX back in the 80s in the UK with a Starduster antenna, it smashed everything around. Back then, we were pirates on AM breaking on Channel 14 going by the handle of Rough Rider. Happy days long gone by.

Have learned from you... the simple fixes...the simple diagnosis....home done.... thanks....

Mike it's got a 470 electrolytic ..it's got a peak swing mod .at back left real I bet it's been tuned I'm sure ...but great teaching ..73s Justin 5180 9lb 🔨

I had no receive on a TRC 30A and found it was the Delta Tune I used Deoxit and turned it several times and now it works.

Nice, old school Kline Philips head, I gots the quick change tip one.

Thank you.

I have the Astatic Road Devil too. Awesome mic

nice little video ,great to see people still work on CB stuff . What ever happened to A/S ? I have a brand new relay for a Super Scanner if you need one lol🇨🇦

Thank you for keeping these videos up, they are very helpful.

Would a browning s23r27 need the michrphone to receive ?

Great videos. Where are u getting your alignment procedure and diagrams???

Is there a way to hook the Uniden and Cobra radios where the microphone does not have to be connected to receive audio?

So what happens when you have a cb that transmits clear as day but even at 25ft apart or less I can't receive anything? Like the speaker definitely works sometimes I very rarely pick up random transmissions from other truck drivers and the noaa stations come through But when I am trying to talk to a co worker at a plant we load at or our yard even if we are like 25 feet apart I get nothing. Same cb as this. But my portable cobra hh50wxst does the same thing and I can't understand why and all it has for adjustments is just squelch... even tried a different antenna still nothing.

Noooooooooooo. I spent the last 20 years collecting test equipment and your telling me I don't need any of it. My life's a failure! But On the other hand if you don't need it anymore can I have all your test gear. My best regards Chris.

I have an cobra 29 lx chr le with echo tune that’s not working at all, so I decided to open the cover to find out the bolts that hold the speaker to the cover was on the mother board, my question is would it effect the cab from working ?

I have a Cobra 29 LTD with the side mike. eBay special. I removed the lids to inspect the insides. Someone disconnected all the wires from the pa/cb switch. The pink and orange wires are twisted together. The white wire from the rear of the circuit panel that says pa is just laying in there. And a yellow wire next to the r114 circuit spliced to the red wire next to the vr1 circuit. I’m assuming these 5 wires go back to the pa/cb switch but I’m not sure in what order. Why would someone disconnect that switch to begin with? The wires are just laying there spliced together

If you hear a "pop" it's usually a class A amp. You're right verry cheep mas produced eqp bears that. Tks Fer show de kv4li.

hi, i have same radio its turn on but no power out and nothing on speaker , what you think ?

Yep, Yep, Yep That was it! I laid my cd on top of center console plugged it all back up, opened up the back end and turned the power on low volume. I took an old home theater speaker out to my truck and hooked up a +/- to the home speaker. then I touched the +/- wires to the bad speaker and Guess what! He's alive Igor!'

Mike - what if a radio will transmit (and has audio), but the radio has good speaker, but no sound?? PA works, too. Caps were tested and are good. What should a person look at then?

I have a brand new road King No squelch and no sound shows no indication that receiving?

Thanks man!

I've never been lucky enough to have only a speaker issue. Well one time on my Stryker 955 I use an external speaker in my truck but bring in and use it as a base with interal. Turned it on and no sound. Turns out the speaker had come unplugged from the pcb. I first thought the transmit had gone bad. Where is Mike? He must have really found something good to abandon working on radios.

I have a pop in the beginning when I turn it on. But no sound after that

ok so I have a beautiful mint Royce 620 base...it has audio but will not produce sound,,i tried a external speaker and it still has no volume...help! can anyone give me an idea of how to diagnose and repair?

Sideband works on my radio but AM doesnt.. what would cause this

I got a uniden bearcat 880 and it key up but wont say key up to talk

Hi folks , no receive or transmit on a little midland , any advice??? Thanks in advance 👍👍

Mine the speaker pops but no sound. I can turn squelch up and down and it does the pop noise. It's not the speaker? An antenna not being hooked up cause this?

I wish they were all this easy CB = Constantly Buying + Constantly Broke 😎

Another way to check audio ic is with pre amp ..and a way to check to see real fast and true I use the pa switch and speaker to check for audio ic output

Always check pa

So what if when I turn my radio on (uniden bearcat pc787) and it beeps loud. But incoming transmissions are very quiet. It's also very quiet through an external speaker. I'm new to this.

how do we send radios to you for repair?

I have a realistic TRC 492 that I've never used since I bought it, I want it peaked and tuned, where is a good CB shop in TN east of Knoxville

ok I have a 2014 volvo vnl, it has the standard cobra 29, I have to right on another truck ass to get them to hear me, my meter light is out, and my ant light comes on when i key the mic and it flashes when I Talk

My Vhf radio not receving; FM sound OK; When I tried sending with another radio (Waki Talki) in same room; it`s ok so it`s not the speaker; could it be something to do with antenna ??? Greeting From Malta-Europe. Tks in advance, xxx

I have a cobra 25 st and it only transmitts about 10 percent. On the back corner where the final is located after about 15 minutes the metal gets so hot you can't touch. It has a 25 watt final in it. I am pretty sure the final is bad but would that cause the metal to get that hot? THANKS,ROBERT

I have a Cobra 29 xlr (gold) pc 241ae board, no rx or tx. Would you be interested in doing repair?

The final was changed to a 25 watt final about 11 years ago.

Hello --- So, what is a "swing mod"?

what’s a swing mod ? Was a large dealer in 70’s

I have been looking for a used cobra nightwatch. They all seem to have the nw light inop. Is that common, and is the costly to fix.

Can this happen on a brand new radio just out of the box.

Is that a common problem with these rigs Mike? in my experience, I rarely see a bad speaker in a radio other than those that have been physically damaged. Maybe they just ain't making those voice coils like they used to. ATYB Doug.

I have seen more speaker jack failures than speaker failures, I would love to find where to buy new PCB mount jacks... would buy a hundred of them.

Good video. Very true comment about the speaker and humidity, I had a recent AR-3500 (pristine!) that had been stored in a basement, and the speaker was shot.

I have a similar problem but my speaker works. I can get sound when I switch to weather broadcast. The tx/rx light is lit. Mike works, i can transmit power but won't receive at all. No movement on the needle even with a handheld right next to it. Antena works on my uniden. I left it on one time and when I came back to it, it wasn't receiving. Im thinking it's got to be a capacitor or transistor but visual inspection.. Everything looks good. I do have a fluke and an o-scope. Where should I start probing?

I wish it was that easy. I have an hr2510, have replaced audio IC, caps, speaker is good. Everything works but no audio to a speaker externt or internal. I can't figure it out

Nice, fault finding at it's simplest.

I have same radio it has power but cant receive or transmit and when you key the mic the gauge above where u plug mic in does not move any ideas?

I have a question if you have a second to respond. I have a galaxy dx99v that someone has done a lot of hack mods to, one being to pull TR32. Will a 2n222 or similar work in its place? Thanks in advance, love your channel, i want to learn more but only as a hobby.

I have come across faults on speakers where the fabian leads had come away from the terminals, soldering them back on fixed them.

I have the same issue they can hear me but I can’t hear them

unfortunately did not help me my radio sends but no receive. Its not the speaker. I replaced every capacitor in it. It really is a strong transmitter now but no receive? the needle on the meter does not show incoming signal activity? But it shows transmitting and I can hear it on my bench radio I use to see if a radio is transmitting. I have several radios that wont receive I cannot fix don't know how ? Some look like brand new radios. I changed the protection diode it didnt help the old diode test out good. the PA still works loud some one destroyed D11 its actually too crazy loud now. I think Im going to loose my 35 bucks on this one.

I get a pop noise but I don't hear any static or anything from any of the stations. There's no way that nobody is talking on other stations I was just hearing sound moments ago. After I messed with the antenna I unplugged the antenna messed with the coax and now there's no sound

Receive delete is a great CB mod.

Mine still has no sound when I hooked up an external speaker.... what could that be?

I have rci 2950cd has no receive power and good audio and tx stack on pa side and good audio on pa

I just fixed one i got for 5 bucks. Someone hooked positive and negitive up backwards, blew the protection diode but not before blowing a hole in the audio modulator ic

Does a real President Washington require the mic or shorting for receive audio? Anyone? Thx

Hey where did you get that screwdriver

What if the ext. sp. jack won't output either? Cobra 29LTD classic

Hey Mike. Can you work on a General Washington model no. M2D01602?

No sound? Like not even squelch sound?

This doesn't help at all for people who don't fit your exact scenario if something you check works explain what to do if it didn't

His hand sure is mobile

swing kit snake oil BS

Okay... "next thing we wnat to check is, cause a lot of radios..." AHHHHHHHHH what is the next thing??????? PLEASE STOP DOING THAT!!!!