Sine Wave Synth

Just got a 701 and it worked fine when I tested it with the seller, got it home and it doesn't work! On power up about half the led's light up and stay lit with no change, memory reads 88. The only sounds that work are the two sound effects. Been trouble shooting around the MPU chip to see if the schmitt trigger signal has something to do with it. Can provide more info, any trouble shooting suggestions?