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The tuner surge is one kind of CM surge test that is performed on TV SMPS to emulate a surge event coming from the connected TV antenna see section 1.2.5. Figure 28 Route of surge (a), Original layout (b) The solution is to change the...
PCB within holds some alarming surprises, like the minimal physical isolation between the mains part of the circuit and the low-voltage section, but the real treat is the Schottky diode that gets up to 170°C under full load. Safety tip: when you smell plastic burning, throw the thing out...
I don't understand why there are so many pins out of it though and I cannot find reasonable power coming out of any of them. I beleived this to be the component at fault for the SMPS not working anymore. I am thinking these were a special bridge or something used in ham and power...
Once you have found the opto-coupler, clean up by removing all the parts associated on the output side of of the opto, meaning across the pins which may be towards the output side of the SMPS PCB. And connect or integrate these pins of the opto with the assembled circuit using the TL43...