{466} SMPS Output voltage Fluctuation How To Repair SMPS Switch Mode Power Supply Output fluctuating

in this smps repair tutorial i explained how to fix SMPS Output voltage fluctuation problem, How To Repair SMPS Switch Mode Power Supply Low OutPut Voltage, smps fluctuation fault have many causes. basically it happens when smps controller is unable to find feedback or some over voltage or short circuit protection is active, in this condition we have to search the root cause of the fault based on nature of fault
CORRECTION. PLEASE NOTE THAT R6 IS NOT CONNECTED TO THE D6 CATHODE, IT IS CONNECTED TO C8 CAPACITOR. (IT WAS MISTAKE IN DIAGRAM BY ME, WHEN I WAS DRAWING THIS CIRCUIT). I AM SORRY FOR THE CONFUSING SHORT LINK ACROSS THE C8CAPACITOR
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it is a TOP214 based flyback converter power supply, in this power supply that output was varying 0 to 1 volt instead of 5 volt. the output was unregulated and fluctuating. top214 ic was unable to receive control voltage (feedback voltage). one zener diode was short circuit in secondry side, which was causing to drop all the output in secondary, so TL431 was unable to find feedback voltage and optocoupler was inoperative, that was the main reason that the optocoupler was not allowing to pass the vcc auxillary voltage to the control pin of the top214 smps controller ic.
i explained the functional description of the circuit with circuit diagram & datasheet. so the troubleshooting becomes easy when we repair with schematic
also i discussed smps basics. after watching this video you can capable to:-
how to #repair #smps
smps output fluctuation
output is not stable or unregulated
if SMPS is dead or no ouput
if SMPS have fluctuating output or output voltage unregulated
if smps have short circuit in output
how to eliminate short circuit
how to troubleshoot PWM SMPS controller when there is no switching from MOSFET
if SMPS have a whistle sound or excessive noise or excessive heat
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