This failure Most people work for the CPU state into. Cause of the fault may be:RgYservice manual download site

(1) may be open or crystal osc frequency offset, if (33), (32) pin voltage is normal, you can substitute this crystal; capacitors C3, C4 leakage; (32), (31) pin low voltage CPU's (normal should be 2.4V.0.6V around), respectively. Can substitute capacitor C3, C4 troubleshooting.RgYservice manual download site

(2) reset circuit, open circuit capacitor C2, leakage, short-circuit breakdown, after substitution crystal invalid, substitution of this capacitor C2; Or ZD3, R32, R54 resistance becomes larger; transistor Q17 breakdown or open, with a multimeter measuring CPU solid "pin voltage is less than 4,5 V; these damaged components can be replaced, troubleshooting.RgYservice manual download site