Check whether the problem is out in the image into the channel and frame output circuit. Consult the frame output circuit. Test the IC681 6 feet 26 v voltage is normal, (3) feet can not meet the normal 52 v voltage. Check D681, C682 found C682 (100 mu 35 v/F) has failed, renewals, frame picture back to normal. Check image into the channel. Puts a multimeter R x 100 Ω block, red pens and grounding, black pens and touch IC201 respectively (LA7550) 21} {, end, pet-name ruby foot. When touch IC201} {21 feet, has the strong noise interference stripes on the screen, and touch IC201 today, pet-name ruby foot, no reaction on the screen. Voltage measuring each foot, most are not normal, especially RFAGC output voltage of 0 v} {11 feet. Key check attending, {11} feet peripheral components without damage. Shut down, with a model 500 multimeter R x 100 Ω block attending, {11} feet of forward and reverse resistance. Attending the foot with a black pen for measuring 0.4 k Ω Ω (normal is 1.1 k), red pen test for 120 Ω Ω (normal is 0.75 k). {11} feet over the ground resistance, using a black pen for 4.5 k Ω Ω (normal is 1.8 k), red pen measuring 3.8 k Ω Ω (normal is 0.75 k). The measured results and the normal difference, on the basis of judgment IC201 has been damaged. Renewals, machine work back to normal.Tchservice manual download site