Boot with high pressure, screen is not bright. Connected to the signal, sound normal. XWDservice manual download site
Cause analysis: 1. The tube power supply circuit (accelerometers, filament power supply, etc.) 2. The decoding circuit (3) control circuit. XWDservice manual download site
Open the cabinet found filament light, measured, accelerating voltage is normal, 200 v as normal. Three cathode is 200 v, the RGB output, depending on the cut-off. With oscilloscope measurement RGB processor IC1315 23,21,19 no RGB output, 37,38,39 feet nor input (37 feet to Y input, 38 feet for R - Y input, 39 feet for B - Y input), 37,38,39 feet signal from DG plate socket,41,39 40 feet. Measured again has no output, measured DG plate of 69 feet (video input) no input, the signal from IC3001 56 feet, has no output, measured input normal 1 foot, doubt IC3001 bad, replacement after the problem has not ruled out. IC3001 peripheral circuits are also found no problem, the input signal is normal, no output signal, IC3001 has been replaced. Question 33 34 feet bus data, write new data after the original store data backup, mount of commissioning, machine back to normal, the original bad data will be stored. Will be stored IC1104 to write data. XWDservice manual download site
In case of failure, according to the normal maintenance ideas such as couldn't find the failure parts, can replace the memory try, sometimes can receive the unexpected effect. I recommend in repairing the machine at ordinary times, accumulate more data (stored data, the key point of the voltage and waveform), because due to store data in fault, often phenomenon is very strange, let a person hold the clue. But one thing to note, before writing new data, it is best to store data backup, once is not the problem of storage, data recovery, the original machine can avoid a lot of unnecessary adjustment, improve the work efficiency.XWDservice manual download site