beerhov
Active Member
Setup - Panasonic TX-p42g20b connected via phono leads to an AV amp (centre and surround left/right). AV amp pre outs connected to power amp video inputs of a 2 channel integrated amp (front left and right).
In the configuration above as soon as I switch on the Panny 42g20 I get terrible interference through my speakers. The interference changes with the picture displayed by the 42G20b, which matches the physical buzzing noise the set makes, especially with the guide button a black blank screen seems especially bad.
If I switch off the TV the interference disappears, and changing the AV amp input to tuner is fine. No matter what input is selected on the AV amp and the 2 channel integrated amp is on video input, as soon as the TV is switched on the interference occurs.
If I run just the Panasonic TX-p42g20b connected via phono leads to the AV amp (all 5 speakers) I get no interference.
Ive disconnected all electrical connections between the TV and the AV amp and tried an optical cable, but still the buzzing remains. If I change the integrated amp to another input with the TV on the buzzing disappears.
Ive tried a grounding cable from the moving magnet stage of the integrated amp to the TV chassis/phono cable exterior conductor with no effect.
Ive had the same problem with a different AV amp/2 channel amp configuration, so this suggests the Panny TV is faulty? Ive already eliminated mains hum by connecting the TV and integrated amp via different 4 way gang extensions, so could I have a grounding problem?
Has anyone else had similar problems?
Thanks in advance!
In the configuration above as soon as I switch on the Panny 42g20 I get terrible interference through my speakers. The interference changes with the picture displayed by the 42G20b, which matches the physical buzzing noise the set makes, especially with the guide button a black blank screen seems especially bad.
If I switch off the TV the interference disappears, and changing the AV amp input to tuner is fine. No matter what input is selected on the AV amp and the 2 channel integrated amp is on video input, as soon as the TV is switched on the interference occurs.
If I run just the Panasonic TX-p42g20b connected via phono leads to the AV amp (all 5 speakers) I get no interference.
Ive disconnected all electrical connections between the TV and the AV amp and tried an optical cable, but still the buzzing remains. If I change the integrated amp to another input with the TV on the buzzing disappears.
Ive tried a grounding cable from the moving magnet stage of the integrated amp to the TV chassis/phono cable exterior conductor with no effect.
Ive had the same problem with a different AV amp/2 channel amp configuration, so this suggests the Panny TV is faulty? Ive already eliminated mains hum by connecting the TV and integrated amp via different 4 way gang extensions, so could I have a grounding problem?
Has anyone else had similar problems?
Thanks in advance!
