Kdf-e50a12u audio No sound from speakers?

SOURCE: dull dark picture on kdf-e50a12u rear projection

Depending how long you have owned it and if a Lamp was ever replaced, it probably needs to be replaced. You can check with SONY at
1800-222-SONY and see if they could sell and send you one.
Hope this helps,
Skyassoc

SOURCE: is it an easy fix to replace the bulb on a Sony

Indeed it is easy to replace the bulb, unplug the TV first, simply remove the outer cover door, then you need to remove the protective inner door, simply place your finger in the ring pull and lift gentley up and pull, when you have the replacement bulb you need to remove the 2x screws on each side holding the fixing brackets then remove the screw that is located at the bottom where the bulb wires are, once removed then you can remove the casing, undo the retainer bracket screws for the bulb and also disconnect the wires from the bulb, DO NOT touch the new bulb with bare hands you must use rubber inspection gloves as your skin oil will damage the lamp, fit new lamp and re assemble housing and re-fit making sure you rerplace the inner door correctly.

SOURCE: kDF-E50A12U MY TV KEEPS TURNING ITS

Hi,
When did you replaced lamp last time in tv?
If lamp has not been replaced in last 2-3 years then it seems time to get it replaced to solve the tv problem OR let me know does red standby light blinks when tv shuts off?
Thanks.

SOURCE: reset the lamp hours on KDF-E50A12U rear projection HD

A quick call to Sony customer service with the model number will answer this and I looked but it is not in the owner manual for this set.

SOURCE: sony kdf e50a12u New bulb but until tv has warmed up (10 min.) it intermittenly loses sound but not picture

The lamp of course will or should not affect the sound---next time it is cold try it on a rear input---a DVD player etc to see if same issue--this could narrow down where the problem is.