Sony rear projection TV KP-FX43M90A failure is not flashing red light, open the cover to remove the motherboard, observe the boot after the boot is turned on for about ten seconds, and the red light flashes, B+ can measure the voltage of 140V when it is turned on. At the same time, the current sound of the deflection yoke can be heard, but there is no sound of high voltage starting, and it is immediately protected. I thought that the Sony machine has many protection functions, over-current and over-voltage, etc., and check each sampling point one by one. At the same time, I think that the rear-projection color TV convergence module is easy to be damaged. The original machine is STK394-510. I didn’t have it. I found STK392-560 to be able to replace it. Change, after booting, it is still the same, and after observation, it is found that a normal CRT color TV is different. Why is the field deflection work and the high voltage is not established? After studying this movement, the high voltage and deflection of the machine are working independently. Similar to the work of the CRT double-row tube, after finding the root cause of the problem, it is important to check the part of the circuit where the high voltage occurs, and finally the whole machine works normally after replacing the MCZ3001DB.
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