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I have a p52929 rca 50" PROJECTION TV. THE OTHER DAY IAS TRYING TO RESERT THE COMCAST BOX, THE TV WAS CONNECTED HERE, SO I UNPLGGED THE CORDS, WHEN I WENT TO TURN BACK ON IT WOULD NOT TURN ON,THEN I CONNECTED AGAIN AND IT MADE LIKE A SPARK SOUND. ON THE POWER SUPPLY CORD.DO I NEED TO THROW AWAY. PLEASE HELP
I would suspect that the shutdown circuit is triggering. Have you checked the HV anodes of the CRTs to see if the voltage is fluctuating? In addition I would check the Horizontal output transistor and the Power FET in the switching power supply. The fact that you removed the blue CRT and put it back and the problem seemed to go away points to a possible cold solder joint which could have this effect also. There are a number of things that could be wrong, Here is a list of some of them that you can check:
1) Faulty component on power supply board (check capacitors for problems) 2) Faulty connection on power supply board (check for cold solder joints) 3) Faulty component on Deflection of HV power supply board (check for bad capacitors, zener diodes, Horizontal Output Transistor, and Integrated High Voltage Ttransformer) 4) Faulty connection on HV power supply board (check for cold solder joints) 5) Faulty CRTs (check anode voltages, remove anodes from CRTs and see if the set remains on, if so check for shorts on the CRT socket board or using a CRT analyzer check for internal CRT shorts)