As the manual states on page 47 in the troubleshooting section of the combined Sony Bravia XBR40/46/52 manuel and - I quote "There is a whirring sound" - "This is the sound of internal fans of the TV(except for KDL-52XBR4/5) It is not a malfunction." Obviously Sony is aware of this sound issue that may be louder for some buyers than others. Sony Bravia KDL-46XBR4 LCD Digital Color TV Controls and Settings. (detail) and the horizontal (x) Clarity (smoothness). The manual isn't very clear as to what these names actually mean. By experimenting, however, I found that the Clarity adjustment produced no clearly visible effect Find great deals on eBay for kdl-46xbr4. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Sony KDL-46XBR4 Tuner Board 1-874-137-21 A1269502A 1-728-810-21 See more like this. Sony KDL-46XBR4 AU Board . Pre-Owned. 5.0 out of 5 stars. Sony has extended the warranty on the LCD panel for the 46XBR4 and XBR5 models. This only applies to the 46' size. Since the TCON is not available as a seperate repair item it is considered part of the LCD panel. Did your Sony model KDL-46XBR4 lcd television break down? SAVE money and repair it yourself! We are here to help - over 177 genuine Sony repair and replacement parts that are hassle free and guaranteed to fit every time! Find Downloads, Manuals, Tutorials, FAQ (Frequently Asked Questions), Tips & Tricks, How to's, Firmware, Drivers, Software, Problem Solving about KDL-46XBR4 Sony KDL-46XBR4 Main Board 1-873-846-14 Pulled from a working TV with a broken screen. Be sure this is the part you NEED. I can't accept returns. I won't pay for shipping so you can diagnose your tv problems. I don't do this as a business, but if I can keep one TV out of a landfill, I feel greener.