HI; MOST LIKELY CAUSE IS "Y SUSTAIN" BOARD. TRY TO FIND ONE ON EBAY. IF ATTEMPTING TO FIX THIS YOURSELF, BE VERY CAREFULL TO MAKE SURE THE POWER SUPPLY IS COMPLETELY DRAINED BEFORE REMOVING BOARD. ALSO, WHEN INSTALLING NEW BOARD, KEEP IN MIND THAT IT IS VERY SENSITIVE TO STATIC DISCHARGE, SECONDLY, CONNECT THE RIBBON CABLE ON BOTTOM RIGHT OF BOARD ONLY AFTER ALL SCREWS ARE TIGHT AND OTHER CONNECTORS ARE SEATED ( MAKE SURE THE RIBBONCABLE IS FIRMLY SEATED AND LOCKED DOWN). AFTER INSTALLATION,CONNECT SET TO A VERY GOOD SIGNAL SOURCE, AND ALLOW SET TO WARM UP FOR ABOUT 20 MINUTES, THEN (USING LARGE, CLEAN MIRROR) SLIGHTLY ADJUST "SETUP AND SETDOWN" MINIATURE POTENTIOMETERS UNTILL THERE ARE NO SPARKLES. GOOD LUCK!!
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HI; MOST LIKELY CAUSE IS "Y SUSTAIN" BOARD. TRY TO FIND ONE ON EBAY. IF ATTEMPTING TO FIX THIS YOURSELF, BE VERY CAREFULL TO MAKE SURE THE POWER SUPPLY IS COMPLETELY DRAINED BEFORE REMOVING BOARD. ALSO, WHEN INSTALLING NEW BOARD, KEEP IN MIND THAT IT IS VERY SENSITIVE TO STATIC DISCHARGE, SECONDLY, CONNECT THE RIBBON CABLE ON BOTTOM RIGHT OF BOARD ONLY AFTER ALL SCREWS ARE TIGHT AND OTHER CONNECTORS ARE SEATED ( MAKE SURE THE RIBBONCABLE IS FIRMLY SEATED AND LOCKED DOWN). AFTER INSTALLATION,CONNECT SET TO A VERY GOOD SIGNAL SOURCE, AND ALLOW SET TO WARM UP FOR ABOUT 20 MINUTES, THEN (USING LARGE, CLEAN MIRROR) SLIGHTLY ADJUST "SETUP AND SETDOWN" MINIATURE POTENTIOMETERS UNTILL THERE ARE NO SPARKLES.
GOOD LUCK!!