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Problem power supply Tech Star K3010D

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alien21:
hello! I am new to the forum i don´t know if this the right place to  post the issue I have with a Long Wei K3010D power supply. What is happening is it is in a repeating start loop on/off. All the voltages are oscillating from mV to a few volts. I have checked for shorts and found none.I checked the optocoupler and tested good as far as I know. For the IC U5 act like this there must be something wrong.The PCB schematics is with some little differencies the same the one I send. I know there´s a member to this forum that is an expert in troubleshooting  this PCB and that member is Chris56000. I really would appreciate any help to solve this issue.
 Thanks in advance for any help.

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