Bosch GML 20 Radio Problem: No Sound, Low Volume on Headphones & Speaker Terminal PCB Images

Hello, I have a problem with the Bosch GML 20 radio, so this is how the radio turns on, everything works except the sound, it works on the headphones, but you cannot increase it very quietly, although the voice control on the display increases and decreases. I am adding a photo of the PCB with speaker terminals, if someone would advise me how to fix it, I would be grateful, thank you in advance for the answers.

Without knowledge of electronics, you can not move, tell someone what he does professionally or set up an advertisement I am going to repair.

I just wanted to find out what could have been damaged on the plate from the photo
and possibly where to fix it and at what cost.

Kob82 wrote:

what could have been damaged on the plate from the photo

Without p

Kob82 wrote:

zenia, or even a cursory "glance" at this equipment (but in real life, the photos may not be quite useful here), it is not possible.
[quote = "Kob82"] where to fix it

On the radio and television service?

Kob82 wrote:

at what cost.

You will find out on the spot. Without a diagnosis (I wrote above) it is impossible, besides, each website has its own prices.

Do you know more about this fault?

I gave the radio to a colleague who deals with car electronics, his diagnosis shows that the SMD TAS5706B chip, the so-called power amplifier, is damaged, a fairly popular fault in these radios, if the ordered part arrives, I will take a few photos of the soldering process.

OK, I will be grateful for the report

Hello, the power amplifier is not always to blame for this, it may turn out that something else has been damaged and the TAS system is good.

Therefore, I am still waiting for the final of this action

To the author of the topic: is something already known?

Hello colleagues. If you have not solved the problem with this equipment, I advise you to check the PCM1808 analog-to-digital converter on the amplifier module, I already got 3 pieces for repair and they all had the same replacement and it flashes.

Hello, I am sorry that I did not speak for so long but I had an urgent departure, but to the point the radio, of course, was the fault of the PCM1808 digital anologically repaired system. Of course, the radio worked for a few days during the tests and then it turned out that the TAS5706B power amplifier was also damaged, I do not know how many cases, but a short circuit in the PCM1808 circuit also damaged the TAS5706B circuit. So, to be calm and enjoy the radio, I would advise you to replace the systems marked in the photos, the repair of the radio was PCM1808 - 5 pcs - 30 PLN, TAS5706B - 1 pcs - 50 PLN. b.jpg [/ img] [/url]

Added after 7 [minutes]:

I brought another radio from abroad and I have a problem with the power supply, maybe someone will tell you where I can find a transformer like in the pictures. After disconnecting the wires from the board, the transformer has a short circuit and heats up quickly and the fuse blows.

From what I can see it may be a transformer from the St-By system. It should be around 3-5W and voltage around 8-9V. What kind of radio is this?

Radio to BOSCH GML20