Here’s what I found. I hope it helps
The Most likely '''Problem''' part: '''BAX-L'''
It seems to be a very common problem with these models.
'''Specs:'''
https://www.sony.com/electronics/support/televisions-projectors-lcd-tvs/kdl-40w600b/specifications
https://www.displayspecifications.com/en/model/90c0166
'''Part sources - Sony BRAVIA KDL-40W600B'''
https://sony.encompass.com/model/SONKDL40W600B
https://www.electropartsonline.com/sony-40-kdl-40w600b-a-2074-642-a-main-video-board-motherboard-unit.html
https://www.shopjimmy.com/sony-kdl-40w600b-complete-led-tv-repair-parts-kit/ (great prices, but out of stock)
There's always eBay too.
'''Good Video:'''
'''SUPER EASY WAY TO FIX MOST SONY LCD TV KDL- PICTURE SCREENS !!!'''
https://youtu.be/ZvuSkRSx6u8
'''If you want to go deeper in a video:'''
How to repair Sony Bravia LCD TV ll Turns On Turns Off automatically blinking led 6 times?
https://www.youtube.com/watch?v=bDWem3g19vk
'''Service Manuals''' | Sony| TV |
https://servicemanuals.us/sony/category.html
'''Higher level manual for:'''
KDL-40W580B, KDL-40W590B, KDL-40W600B, KDL-40W605B, KDL-40W607B, KDL-40W608B, KDL-48W580B, KDL-48W585B, KDL-48W590B, KDL-48W600B, KDL-48W605B, KDL-48W607B, KDL-48W608B, KDL-48WM15B, KDL-60W600B, KDL-60W605B, KDL-60W607B, KDL-60W608B
https://servicemanuals.us/sony/tv/kdl-40w590b-kdl-40w600b-kdl-48w590b-kdl-48w600b.html
'''Level 3 Service Manual (detailed):'''
https://servicemanuals.us/sony/tv/kdl-40w580b-kdl-40w590b-kdl-40w600b-kdl-40w605b-kdl-40w607b-kdl-40w609b-kdl-48w580b-kdl-48w590b-kdl-48w600b-kdl-48w605b-kdl-48w607b-kdl-48w609b-k.html
No Picture '''Troubleshooting Point - P.63'''
https://servicemanuals.us/sony/tv/kdl-40w580b-kdl-40w590b-kdl-40w600b-kdl-40w605b-kdl-40w607b-kdl-40w609b-kdl-48w580b-kdl-48w590b-kdl-48w600b-kdl-48w605b-kdl-48w607b-kdl-48w609b-k.html?limit=4&start=64
No Picture '''Blue Screen Troubleshooting Point - P. 73'''
https://servicemanuals.us/sony/tv/kdl-40w580b-kdl-40w590b-kdl-40w600b-kdl-40w605b-kdl-40w607b-kdl-40w609b-kdl-48w580b-kdl-48w590b-kdl-48w600b-kdl-48w605b-kdl-48w607b-kdl-48w609b-k.html?limit=4&start=72