Question about Televison & Video
No Picture and No Sound. Output of Bridge Rectifier reads 307VDC. The set uses a control IC, TDA4605-2 and a switching MOSFET Transistor, K1118 N-Cn in the SMPT and these components are OK. The Stanby LED light does not come on. The micoprocessor is not receiving a 5 volts supply. There's very little voltage, 57VDC ,on the B+ line. When power is switched on, a knocking or thumping sound ,on/off about once every second, is heard through the loudspeaker. This set is giving me a massive headache. Over to you top experts. Thank you very much.
I suggest you look at the Horizontal output transistor, when it goes short the supply is in protection mode, it is pointless reading voltages at this stage, check the transistor located close to the Horizontal output (Flyback) transformer and normally mounted on a large heatsink. Check the caps in the primary power supply stage....hope that helps..Phil
Posted on May 19, 2009
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Posted on Jan 02, 2017
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