According to the phenomenon analysis, problem could be in the IC bus control circuit. The DVD playback, the microprocessor IC6031 read through serial bus IC6401E2PROM stored in video mode parameter values, and the corresponding video output control. Signal, and make the video signal processor IC3532 36, 38 feet output C and Y signals respectively. When there is something wrong with the serial bus, can lead to wrong words.if video signal processing circuit, appear phenomenon has small squares in the image. Use oscilloscope to detect serial bus working status, found the serial clock signal SCL is low level, normal should be high level; Further check the relevant parts of the periphery, found that the SMD resistor R6003 (10 k Ω) desoldering, again after repair welding, troubleshooting.TYSservice manual download site