The fault source obviously in the pincushion correction circuit. The machine pillow correction circuit similar to the circuit shown in figure 1, its obvious difference is CMT2518 color TV without pillow school work abnormal protection circuit. When maintenance accordingly to adjust the line to adjust potentiometer R655, found that the image line no change, but in the process of adjusting R655, pillow school integration block IC651 6 feet measured voltage changes from 11.6 V to 11.8 V, on the basis of elucidation IC651 6 feet external circuit element is good, then the R655 back to the original position, and then measuring IC651 today, pet-name ruby foot voltage of 0.7 V, 13.8 V, compared with the basic circuit coordinate values are high; At this point in the oscilloscope measurement IC651 end feet output signal waveform, with field frequency on the convex parabolic wave voltage waveform, accordingly IC651 internal circuit is good, the fault is very possible is the drive pipe line Q6sl damage or bad relevant parts of the output circuit. So again Q651 was detected in B and C of dc voltage, followed by 0.1 V, 16.8 V (normal should be followed by o. 5 V, 12.4 V), apparently Q651 in off state. Remove the Q651 after shutdown, via detecting its normal electrode resistance; Then detect Q6sl base external components D652, R659, found D652 serious leakage, trial after a 1 n4148 substitution this tube to restore the original circuit, troubleshooting.qc5service manual download site