Helix HX-4635 Powers on, no sound alarm works....

[ny935]

I scored another one. Looks great good price but needs work, like my Korean. This Helix model powers on but didn't pop, no sound at all and LEDs do not light up when button is pushed, I believe they're supposed to all light then go back. Vu shows power on, dial light works. Cassette motors work. Only get a pop when stereo wide is selected.
The alarm works and the siren is loud, but comes on immediately when the button is pushed. No sound on line in or headphones.
I seen a similar post before mentioning something similar. Any ideas where to start with this one? Thanks guys for the help, haven't had a chance to check the Koreans issue. To busy buying again

The guy said he used an adapter to power it on recently. Was original owner, couldn't find a cord smh

 

[caution]

I'd start by checking D202, that's part of the regulator for the main rail that powers most of the unit. When you push in the alarm switch, it reroutes power directly off the fuse to the alarm circuit and alarm LED, which don't rely on that regulator circuit, so that's why the alarm works and nothing else except for the deck motor.