MY TV SONY BRAVIA MODEL#KDL-40V5100 ONLY SHOWS A BLUE SCREEN AND IT DOES NOTHNIG

SOURCE: sony kdl-40v5100 has handshake problem

1.This issue sounds as though the TV connection circuit has an issue.
2. You have changed the DVR and the HDMI cables and you still have an issue with the video (pink screen) indicates a video circuit issue ( improper voltage or current) at the video section of the circuit.
3. This will require some troubleshooting by a qualified tech.
4. To make sure, try connecting another properly working LCD TV to the cable box or DVR an check.If you get a picture and sound properly it is the TV.
5. Usually a cable box is QA'd (quality assured) by the company and will not be sent unless tested 1st

SOURCE: volume control on sony bravia kdl-40v5100 is not

If you are using a Motorola cablebox, you may need to change the Audio in the cablebox to Heavy Compression. You can find this in the cablebox Menu, Setting, Audio. Set the audio to Advanced then change the compression.

SOURCE: KDL-40V5100 TV HDMI Issue

I have the same problem did you ever find a solution

SOURCE: When turning on TV, sound is often absent.

Unplug,replug the tv about an hour later,let the tv reset itself.Tries goto tv menu,go to AUDIO,go down to reset the audio setting,back to factory setting.Goto menu to PICTURE,go down to reset,to resetting the Tuner board back to factory setting.The sound,should be there,now all the time.Not,than the Tuner board have problems.That the board,where the broscasting signal cable plug into it.That the Tuner board.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish Tuner board for the replacement.

SOURCE: sony bravia kdl 46s4100 no picture

it sounds like your back light might be going out. You might be able to fix this by installing a new backlight inverter board.