At this point to the right location under the screen appeared two broad bean color patches, the size of a long period of time can't disappear. 49Dservice manual download site
 49Dservice manual download site
Boot can hear high voltage start, this means that the system control circuit and power supply basic normal, should be working circuit anomalies caused by some kind of protection. Screen protection circuit in sequence, and finally find out the cause of the problem for the audio amplifier IC2301 (TDA7490) between 22 and 23 feet breakdown, causing + VC for short circuit caused by over current protection, over the loudspeaker replacement IC2301, troubleshooting.49Dservice manual download site