Distorted sound because of HDMI inports.

SOURCE: Panasonic TH-46PZ85U Plasma TV

Symptom:
TV shuts off unless all the input (phono and HDMI) cables are disconnected. The
symptom may be intermittent.
Cause:
There is an abnormal AC voltage entering the TV from one of the input cables or AC
outlet.
Remedy:
Follow the Testing procedure to determine if there is a problem external to the product.

Concept
Constant symptom
If the TV no longer shuts off when all input cables are disconnected, then one of the
input cables is introducing abnormal voltages into the TV. Panasonic Plasma TV sets
have 3 wire AC plugs.
As a result, abnormal voltages introduced into this TV will cause the TV to shut off for
protection.
Intermittent symptom
If the abnormal input voltage is borderline (marginal), the TV shut off symptom may be
intermittent. However the cause may still be detectable with a voltmeter.
Protection Proof:
Release the protect mode - the TV has to be unplugged to reset this protection circuit.

Threats from the HDMI input:
Excessive voltage from an HDMI cable connected product will activate the Plasma TV’s
protection circuitry. Placing an isolating / buffering connector (sometimes called a voltage
conditioner) between the TV and the HDMI input cable often solves the problem.
Testing -
Unplug all the HDMI inputs from the TV. Turn on the TV. Plug in the HDMI inputs one at a
time. The cable that causes the TV to enter the protection state is connected to the product
that has the excessive voltage (and signal). Avoid connecting this product until an isolating
connector is found.

SOURCE: Plasma TV Picture Periodically Blurry/Color is Distorted

This sound more like a cable issue. Also check the leads going from your cable box to the set/ If you are using component cables one of them may be loose.

SOURCE: hi! my laptop do not have an hdmi port. is it

Eforcity 280080 VGA to HDMI Cable M/M 6 ft Black If your laptop has a VGA port.
Thank you

SOURCE: we have connected our asus K52J lap top to our

Hi there
I've just looked at that TV model, and it appears that your TV does not support a separate audio connection for HDMI sockets. It also appears that your laptop model has a issue with sending audio via HDMI. Are you running Linux, or windows?
Hope this helps
TV_Doctor

SOURCE: Sony Viao HDMI to Panasonic Plasma TV HDMI Input handshake

My TV turns off while watching and message pops "Plasma no signal " . Please tell me what to do . Thank you