Hi, if the display flicker every time you switch on the tri and the sound signal remains fluid and don't follow the flicks, maybe a bad soldering connection.
If the flicks affect the sound, you can find he trouble in the power input stage.
I'd a similar problem last mounth with the 8 mode leds. Someone start to flashing shortly, sometimes not, until the fatal day. Now, with the new soldering, all leds work fine. :wink:
Send it to a prof tech in your town. He can check if your tri problem is a cold soldering or something else.
Anto