Sa-vk91d Power Amplifier IC - Panasonic SC-VK31 220 Volt 5-VCD/CD Changer Shelf System

Are you sure that model number is correct? It looks like they should have 4 numbers.

Technics SA-5570 Service Manual

You need Wiring Schematic, or Block Diagram or Service Manual.

https://www.google.com/search?q=Technics+SA+E570+wiring+schematic

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While stopped and "DVD/CD" is the source, press and hold [L, STOP] on the main unit and[h10] on the remote control for about 3 seconds until "Initialized" disappears from the television. Turn the unit off and on again. All settings will return to the default values

Unplug. wait 10 min,s and re plug.
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toslink and external spk set up

Forgot the player's password

Hi,
Replace amplifier output big IC that seems defective and not giving sound to speaker.
Thanks.

The overload indication tells us that there is a problem in the final stage of the amplifier section. This model uses an AMP-PAC or large amplifier IC (part number RSN-3305) which is now defective. If you can solder, try resoldering the pins on this IC. Sometimes a poor solder connection can cause a voltage offset that will be detected as a fault and shutdown the system like this. If the resoldering fails, the IC will need to be replaced. Parts cost will be in the $75-$95 range.

Dan

tda 2040 are a cheap aschips

The audio amplifier IC of your device are damaged you need to replace it.

CHANGE STK --------IC