Trying to fix a radio ?

Eric in IL · Jan 23, 2022

The radio quit in my 94 Ram truck. This is the second time. So I am not sure of the age of this radio because it came from a salvage yard.

I am in way over my head taking this thing apart, but what is the worst that can happen?

This board is just under the face of the radio. I see a part that has been hot. Any way to test that gizmo while it is still soldered to the board ?

Janicholson · Jan 23, 2022

It looks to be a carbon film resistor. There are two issues: one is that when hooked up in the circuit a Ohm meter will likely measure other thigs in parallel with it making a reading that has no relationship to the part. The second is that even if one side is disconnected (desoldered with a piece of stranded copper wire and a pencil iron to suck the solder away) the only reading that would mean anything is infinite ohms (open) other readings may reflect conduction, but what it should be is probably going to take a circuit board with a good on on it. If the issue was serious enough to disable multiple radios of that vintage, there might be a circuit diagram, or service bulletin, but not likely.
Replacement radios are not expensive and would fit into the slot. Jim

pete 23 · Jan 23, 2022

No ideas on your circuit board but I did repair the Magnavox Tv that is on the wall in the house. Daughter's Tv and it quit. Would not come on. Had been bucky and slow to come on for a while.

They quickly got a new , bigger , better TV. I said bring it on down. Did some research on u=tube and by pure luck found where a couple of capacitors could be the problem. Best part was that the capacitors were made with a indentation on the end and when they go bad it bulges out.

Found three bulged ones, found some new ones on the net and for a ten dollar bill I replaced my almost new much smaller TV. That was over three years ago so worked out well.

You might get lucky and find some information and parts online.

ss55 · Jan 24, 2022

Crutchfield offers free mounting kits and instructions with their aftermarket radios. Makes the job a lot easier.

https://www.crutchfield.com/S-4plCiasLDkY/m_266150/Car-Stereos.html

Eric in IL · Jan 24, 2022

Thanks to all responders. I am going to call Crutchfield this morning. Upgrading to bluetooth might save me a traffic ticket.

It appears that about 80 percent of Crutchfield's radios are unavailable. That will make the decision easier I guess. I have used their installation kits before and they do speed up installs.

caterpillar guy · Jan 24, 2022

I would more likely suspect a cracked solder joint on the board. I had an old tractor fender radio that would crack a solder joint in the circuit board like that just hit with solder gun and go back to working again.

JMOR · Jan 24, 2022

(quoted from post at 13:28:48 01/24/22) I would more likely suspect a cracked solder joint on the board. I had an old tractor fender radio that would crack a solder joint in the circuit board like that just hit with solder gun and go back to working again.

he way the designer hung the resistor out in free air likely means hot is normal. I would look elsewhere.

rlp in Co. · Jan 25, 2022

Can You read the value of that resistor? If you use a harbour freight ohm meter, it won't turn on any transistors unless you use the diode check setting. If that resistor has been hot, there is something else wrong, that is drawing too much current.

Trying to fix a radio ?

Eric in IL

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Janicholson

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pete 23

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ss55

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Eric in IL

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caterpillar guy

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JMOR

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rlp in Co.

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