DG's Hardware board

info:
https://www.philips.co.uk/c-p/HTL5140B_ ... ar-speaker

I had this sound-system together with a Sony TV from my sister with the remark that the (wireless) sub-woofer not always works.
Actually it only worked for about 4 to 5 minutes then it went off and never went on again.

The sub-woofer info:


Inside the sub-woofer a 2 prints, a power supply and a receiver/amplifier print.
Receiver/amplifier print:

Upper left the WiFi receiver (WPA122xxx) and its antenna cable, and on the right a white connector for all powers from the power supply PCB.

Sub-woofer has 2 amplifier IC's: TAS5538 (pre-amp) and TAS5352A (last one with a rather big heat-sink).

TAS5538:


TAS5352A:

Clearly 2 holes to attach the heat-sink.

Tested the power supply, if all required voltages were applied, which were all there.
And always check for expanded capacitors:

But those were all fine.

Ordered a new TAS5352A (eBay, AliExpress?) and hot-air-soldered the new TAS5352A in it's place.
Until now the sub-woofer works as desired.

DG.

About 8 months later the bar itself started to make crackling high pitch sounds.
Tested the PCB board, but too difficult to find the place where the sound is getting worse.
Decided to not use it anymore. Despite of the repaired sub-woofer.

DG.