{630} SMPS Output voltage Fluctuation / Switch Mode Power Supply Output Not Regulated

SMPS Output voltage Fluctuation / Switch Mode Power Supply Output Not Regulated. smps output fluctuation term is used when the output voltage of switch mode power supply are not being regulated properly. irregulated amplitude of the output in any smps is called fluctuation
it may be due to many reasons
1. main dc capacitor is internally open circuit
2. vcc capacitor of smps ic is open internally
3. vcc circuit / bias circuit / auxiliary circuit is open circuit
4. output circuit have some short circuit capacitor
5. feedback circuit is not working properly, it may be due to reference circuit, TL431 reference, or optocoupler or its related components

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You Can also check these videos for fluctuation problem
https://youtu.be/lgoKPCVPRWg
https://youtu.be/lz_k3ebK5NM
https://youtu.be/W18V5jjK-hM

ATX POwer Supply Circuit Diagram Explained https://youtu.be/1ZoAMFBNly4
300 Watt Half Bridge Power Supply Repair https://youtu.be/HQTPlRAWD2U
How To Repair SMPS https://youtu.be/OwmN-N8kgHw

in this video i demonstrated How To Repair Switch Mode Power Supply SMPS When Low OutPut Voltage & Fluctuation. it is a KA7500 / TL494 based push pull topology power supply, in this power supply that output was 5 volt instead of 12 volt. the output was unregulated and fluctuating. i found both smoothing dc capacitors open circuit. i replaced the capacitors and the supply started working normally.
i explained practical How to repair switch mode power supply SMPS very easy. i shared my easiest and perfect troubleshooting techniques practical troubleshooting. smps concept and troubleshooting repairing or understanding repair switching mode power supply basics and working principle. also i discussed smps basics. after watching this video you can capable to:-
how to #repair #smps
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smps, repair, troubleshooting,
SMPS practical tutorial https://youtu.be/7je0v8AiBB4

SMPS tutorial and practical troubleshooting and fault finding https://youtu.be/E_dQcKAqm38
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