Sony HD Bravia KDL-42V4100 No Sound

Check all fuses. If you have power going into the power supply board..but none coming out of it...I think you have found your problem. Get a new power supply board.

I have encountered this before---there are set top boxes that will convert the NTSC to PAL and the only other concern is the line voltage being the same or not.

If your TV is a month old call sony and get the TV serviced or exchanged. You are covered under warranty.

I think fault is in electrolyte capacitor.You should check the supply volt of cathode & all relative component of RGB input.

You've got a board going bad - most likely caused by an overheating diode or capacitor. It's going to require a service visit.

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Search the site by type in the "BRAND NAME" of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Sounds like main board issues

Hi there

this is not meant as a solution, but a tip if you`d like to get an answer.
You should clarify in which occasion you get either sound and no video or black screen with sound.
This is a little confusing for a repairman.

Hi,

Sounds like there is a short on the power board or the power board has gone faulty.

Look on the power board to see if any of the capacitors are bulged or if there are any other components burnt out. The TV is going into protect mode because of an over current, which points to a short on the board or a component has gone short circuit.
Thanks

it is your HD box. get another one.