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Two years ago, my father and I both received a Tecsun PL-660 radio as a Christmas gift. We both have had good experiences with our radios and generally enjoyed them until they recently both stopped working. I should mention my radio has been at my house in Arizona for the last 2 years, while my Dad's radio has been in Pennsylvania. So they have been in completely different/isolated environments.

My Dad's radio died first and seemed to be completely bricked. There was no on-screen display at all, and no combination of batteries or wall warts was going to get that radio to do anything. It was a doorstop.

About a month later, my radio starting flashing the display and blinking a "Lo battery" message. Changing the batteries and/or using the wall adapter did not improve the situation at all. The radio simply will not turn on.

Now, some cursory googling has shown a lot of people have had problems with this model of radio, and for the price they generally give up and get a new one. However, we generally take good care of our gear and the radios were gifts so we decided to see if we could do anything...

After taking apart my Dad's radio, I noticed there is a small button battery welded to the main board. Reading the battery in place showed it to be completely flat. So we did some surgery and 'popped' the battery off the board. We did some guessing as to the correct voltage, but putting 4.5v from an external set of AA's was enough to bring my Dad's previously dead radio back to life. Almost.

The display (computer?) has come back to life, we can turn on the radio and selecting different bands works. The radio will tune and looks like it should be working. However, we still have NO audio at the speaker or the headphone jack. The on-screen signal strength meter is completely flat, and the internal display 'backlight' will not illuminate.

I could theorize we had two separate issues, and we only fixed one of them by repairing the flat battery - or maybe we flexed/broke something when removing the original button battery from the board.

So the crux of my question is for some input of what else we might check? I don't have access to the second radio at the moment, so there is no way to find out if the battery repair is enough to bring the second radio back to life. Until I can do that test, I figure we can continue to tinker with the radio we do have. But what should we chase? Obviously we aren't going to get into replacing surface mount IC's etc. So I'm fishing. Any ideas?

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    $\begingroup$ A single button cell would likely be around either 1.5V (alkaline e.g. LR44) or 3.3V (lithium e.g. CR2032), by the way: en.wikipedia.org/w/… $\endgroup$ – natevw - AF7TB Oct 30 '17 at 20:31
  • $\begingroup$ I wondered about that. We started with 1.5v and didn't get any results. We stepped up to 3v and were able to get "Low Battery" flashing on the display. Our third try at 4.5v allowed the radio to turn on and (seemingly) operate as expected except for the symptoms mentioned in my post. $\endgroup$ – Geo... Oct 31 '17 at 0:00
  • $\begingroup$ As I say in the answer, write the seller a message and ask for a replacement. Then, however you do get it fixed you can feel free to come back here and post the results as an answer to your own message to attract a few upvotes as you contribute to the database. $\endgroup$ – SDsolar Oct 31 '17 at 1:04
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Tecsun is very similar to Baofeng in that anybody selling them expects a certain number of DOAs and other failures. They already know that QA on those rigs is directly reflected in the price.

In the past I have had good success with getting vendors of like this to replace the radio body (no battery or antenna) simply by writing to them.

I have gotten two Baofeng radio bodies shipped to me (no return necessary) and returned a Tecsun entirely this way.

On eBay they always appreciate it if you do not use the return option - instead just send them a message. That way they will hope you can still give them positive feedback and their selling reputation doesn't take a hit.

Your question is about how to repair it: My answer is that the best repair is replacement.

Give it a try. Send them a message.

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