Buzzing Sound on Radio

[lightray03]

hello i have a problem on my radio
it creates a buzzing sound when turn on or even when turn off
and my suspect is the Amplifier TA8227, i tried to replace the filter capacitor and the problem on having buzz sound when turn off is now gone
but the buzz sound when on radio mode and cd mode doesnt gone
i hang also the inputs at pin 6 and 7 and the amplifier still creates buzzing sound(even having no inputs)
what should i do next? can someone help me please im still a beginner

[madires]

Is it a 100Hz (for 50Hz mains) or 120Hz (for 60Hz mains) buzz?

[lightray03]

its a 100hz buzz

[madires]

I'd check the filter caps in the power supply.

[lightray03]

i already check the filter caps and replace it with a new one, the standby mode or the off state doesnt output buzz
but when turn on the buzz still exist

[madires]

I see. Maybe someone else got another idea.

[mij59]

Hi,

Measure the dc voltage at the output of the amplifiers, pin 2 and 11, should be about 1/2*VCC1.
Check the voltage VCC2.

[katzohki]

Post what pictures / circuit diagrams you can for us to better help.

[Strada916]

Ground loop........?