Model: Changhong rear projection TV HP4368 rear projection color TV failure: full screen drawing, the red convergence on the left does not coincide, and the power supply has an abnormal sound. Our company specializes in the production and sales of all kinds of terminals, copper terminals, nose wire ears, cold pressed terminals, copper joints, but also according to customer requirements for customization and production, our raw materials are produced and sold by ourselves, we have their own raw materials processing plant, high purity T2 copper, quality and quantity, come to me to order it! Copper Connecting Terminals,Cable Lugs Insulated Cord End Terminals,Pvc Insulated Cord End Terminal,Cable Connector Insulated Cord End Terminal Taixing Longyi Terminals Co.,Ltd. , https://www.lycopperterminals.com
Overhaul: Brushing on the full screen, related to the field scanning, power supply and convergence circuit; the red convergence on the left side of the image does not coincide, it is related to the convergence and power circuit; the power supply has abnormal sound, it is related to the power supply and load circuit. Combine the above three points to determine the fault in the power supply or convergence circuit. Measure the voltage of each group of power supply output and find that the +25V voltage is lower, which is +13V. Measure the negative resistance of the +25V rectifier diode VD863 to ground, which is greater than 1.8K, indicating that the load is not shorted to ground. The resistance of the positive electrode to ground of VD863 is 0 ohm, which is normal, indicating that the current limiting resistor RP838 does not become large. Judging the poor performance of VD863, replacing it with RU3, the fault remains unchanged. Try a new 2200 microfarad (35V) capacitor to replace the C867, troubleshooting.