Hi
My matsui digibox has turned itself off and wont come back on. hte red light is on and when you try it manually using the button on the box it shows a number 8 briefly then goes off
As you have not had an answer yet this may help. Matsui is a DSG (Dixons/Currys) own brand so you may want to talk them. Having said that, if the box is over a year old it's usually not worth repairing a budget box; as they are so cheap now, you may as well but a new one.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix dtt receivers.