Public measuring single-pole double-throw switch of side resistance value between two ends whatever in the switch state conditions are all 2 k Ω remains the same. Remove the measurement are all normal! Existing in the analysis of the circuit fault. Tests found thick film switch power supply block IC601 {3} feet (circuit boards marked with VCC) and {2} feet short circuit, {2} feet for grounding (hot), shows that the power of the thick film IC power of short circuit. Cock IC601 {3} feet measured value is normal, as is D630 broken down. D630 1/8 glass encapsulation w27v stabilivolt, use SA24A (dc voltage values about 27 ~ 40 v. Boot display work back to normal.3T3service manual download site