Sony SWF-BR100 Wireless Sub repair

[walzz]

Need some help with a Sony SWF-BR100 Wireless Sub that I am fixing.

Looking for a schematic of the Class D Power Amp board, or at the very least a datasheet for the CXD9981TN power amp chip. I have removed the heatsink and wiped away enough of the thermal paste to read the Sony part number.

Research so far indicates it is very likely a Texas Instruments IC, rebadged for Sony. I have been looking at datasheets of many variants in the Texas TPA series but the pinouts don't match on any of them. The chip is a 44 pin HTSSOP surface mount package.

Been searching for a week and running out of leads. Hoping that someone can shed some light and put me out of my misery..

[diif]

Re: Sony SWF-BR100 Wireless Sub repair

I'd just buy and fit a replacement as they are so cheap. https://www.aliexpress.com/item/32840806273.html

[R_J]

Re: Sony SWF-BR100 Wireless Sub repair

Here is the pinout. Why do you suspect the ic is bad?

[walzz]

Re: Sony SWF-BR100 Wireless Sub repair

Hi R_J, thanks for the pinout. This is a bit of a saga so bear with me.. The wireless subwoofer is still operational and belongs to a family member who had a top of the line 75" Sony (X9400) TV. The TV died and was replaced under warranty with the X9500 model that superceded it. The problem is the new TV does not provide subwoofer support and won't work with the new model. He is now stuck with an expensive paper weight.

Plan B was to connect the Sony bluetooth dongle to Subwoofer Out on the AV Receiver and get audio to it that way. Unfortunately that didn't work either, and I suspect that the TV performed handshaking with the TV via USB to enable audio. Because the dongle has a 3.5mm mono plug that accepted analogue audio from the headphone output of the old TV I thought it would be a simple matter of powering it up from a spare USB port, pairing the dongle with the sub and everything would be sweet.

Plan C was to modify the sub with a wired analogue in. I just needed the data sheet to work out which pins on the IC to connect with. I was fairly certain it was a re-badged TI chip and checked out all the Class D analogue input chips in 44pin packages. None of the pinouts matched and it was just that I stumbled across another thread on this board discussing the 44pin PA chip in a Marshall amplifier, but with digital input. Datasheet downloaded and the TAS5342 was an exact pin for pin match to the CXD9981. Eureka!!

I assume the audio path from BT receiver to the PA chip is digital all the way which probably brings me to Plan D which is to remove the PA board and replace it with a cheap Class D amp from eBay. I thought getting this working would be a piece of cake when I first started. I appreciate your help!

[Buddyjones]

Re: Sony SWF-BR100 Wireless Sub repair

I have the Sony SWF-BR100 and was trying to either use an analog input or somehow use the speaker for a sub on my samsung tv, otherwise I won''t need the amp or usb blutooth dongle. Any thoughts on using this on non- sony tv? Thx in advance!