Check the DSP output data; check the decompression plate 5V power supply is normal; 3204 {23} pin reset is normal; oscillator and oscillator capacitor for invalid. CH7201A{41} foot and 1 foot output clock are normal. However, there is no signal input for {19} ~ {26} (luminance data), {11} ~ {18} (chroma data).. In this case, the fault range is enlarged when power supply, clock and reset are normal.. ESS3204, ROM (read-only memory) and DRAM (dynamic random access memory), SRAM (register) any damage, may in this case occurs. According to the first easy after difficult, the first simple after the principle of complex, pull off the machine ROM, with a written ROM plug on the test, the fault is still. Try changing SRAM (V53C16256HK50), troubleshooting. Maintenance also encountered ROM (read only memory) damage, the phenomenon and the case, as long as it is pulled from the socket, plug in a piece of ROM has been written, and try to know.q66service manual download site