Trying to repair my Pure Tempus-1 DAB radio

[deephaven]

My Pure Tempus-1 DAB/Alarm Clock has given me good service for several years. Then, while I was listening to a radio station on it, it suddenly made a short squawking noise for a couple of seconds and then fell silent. So now, it shows the LCD back-light but nothing on the LCD display and no sound.

I took the thing apart and saw a couple of regulators and measured 3.3V on the output of one and 5V on the other, so it looks like the power supplies are still working. I had a look around the boards and noticed a crystal oscillator and this was producing the correct output. There is one small square BGA chip and I tried pushing down on that while cycling the power, but this didn't do anything. Probing around all the electrolytics, they all seem to have believable voltages across them. The AF amp also seems to be operational.

Trouble is, I can't see anywhere on the web to get a schematic, so I'm working in the dark with this. Does anyone have any suggestions on stock faults or source of a schematic?

[Smith]

On the interweb people report flashing the software again to fix the issue you describe.

[deephaven]

On the interweb people report flashing the software again to fix the issue you describe.

Thanks for the comment. There doesn't appear to be firmware for my particular model, only the 1S

[Jack_D_Ireland]

Hi deephaven,
I have also come across the same issue with this model. I'm an amateur at electronics but I do like a puzzle... What I discovered at that time was that the power supply from pure (12v) was a basic heavy transformer with 4 diodes and a cap in it, one of the diodes was open and it was outputting 18-19v from memory.
Inside the lcd backlight was on as you stated caps looked ok. I attached bench power supply 12v. The heatsinked LM317 got hot 60c quite quickly, assumed that's okay, but what's drawing the current? Had a look at data sheet for the TDA7266 dual bridge amplifier and noted that the voltage on pins 6 & 7 MUTE  & ST-BY were above the max stated, that's as far as I got.
I will try and trace the source of those voltages, I believe they originate on the front pcb.

I see someone posted a Pure Evoke Flow Radio to Dave. Really looking forward to Dave getting inside this Chinese built radio...

I will keep an eye on this thread.

[deephaven]

Thanks for your comments, Jack. All the voltages appear to be ok. I fear the BGA chip may have failed which would be a bit of a show stopper for me. It would be nice to have a schematic so that I wasn't working in the dark, but I haven't managed to track one down so far.