First change header, still four or five minutes after we change the image, but at this moment the image is clear, visible header be affected with damp be affected with damp is out of the shadow slow for one reason, but there are other reasons. According to according to this kind of situation, no grating overhaul, the boot in a short period of time, the voltage measurement points, and found that the 12 v power supply is only 6 v, Q904 emitter voltage is only 10 v, as shown, the control circuit diagram after substitution check, it is easy to find out filter capacitance C915 (100 mu F / 16 v) is damaged, replace, out of the shadow of slow troubleshooting. But the image is still not normal (interference stripe image dim, the upper part, returned to normal within a few minutes), after repeated repairs, finally puts LA7550 of manifold blocks to solve the problem by repair welding, through this example can be integrated piece of virtual welding can also cause fear of cold.vZGservice manual download site