Hello friends,
It's been almost two years since I had joined this wonderful forum and until today i have learned alot in electronics. As newbie in repairing atx psu need some help for resolving the problem in T&P-DHK 350W PSU which outputs only +5vsb. No burned components at all just suddenly stopped working. So far I have checked the components in the sections that I have labelled in attached photo.
I have a working same type and model psu and compared the values with my multimeter. Also exchange and resolder many components from the working one, but the problem remains. The second (working state) psu with the parts from the faulty one still works fine.
I have attached some photos and hope in your kindness to help me solve the problem. I have tested diodes, power IC's, transistors, capacitors, resolder almost half parts rectifiers, transformers, IC's etc, but still no success. :-(
For your information: When I soldered reversed the two transistors near the power IC, I got all volts output but the bulp test shows me as expected that short exists, so I put it in right order again and got +5vsb. Unfortunate I don't have an oscilloscope to make further checks, just a multimeter, DIY in circuit transistor tester, PC ATX SATA PSU HDD Power Supply Diagnostic Tool Tester and a bulp tester.
The attached schematic looks quite same model. I have ordered an esr tester with some other parts needed for another psu (PSU Trust 420W PW-5210) that had some burned items and same problem (only +5vsb) too.
Will you please help me by marking the necessary steps - checks on the photos?
Thanks in advance for your help .
Some photos are:
It's been almost two years since I had joined this wonderful forum and until today i have learned alot in electronics. As newbie in repairing atx psu need some help for resolving the problem in T&P-DHK 350W PSU which outputs only +5vsb. No burned components at all just suddenly stopped working. So far I have checked the components in the sections that I have labelled in attached photo.
I have a working same type and model psu and compared the values with my multimeter. Also exchange and resolder many components from the working one, but the problem remains. The second (working state) psu with the parts from the faulty one still works fine.
I have attached some photos and hope in your kindness to help me solve the problem. I have tested diodes, power IC's, transistors, capacitors, resolder almost half parts rectifiers, transformers, IC's etc, but still no success. :-(
For your information: When I soldered reversed the two transistors near the power IC, I got all volts output but the bulp test shows me as expected that short exists, so I put it in right order again and got +5vsb. Unfortunate I don't have an oscilloscope to make further checks, just a multimeter, DIY in circuit transistor tester, PC ATX SATA PSU HDD Power Supply Diagnostic Tool Tester and a bulp tester.
The attached schematic looks quite same model. I have ordered an esr tester with some other parts needed for another psu (PSU Trust 420W PW-5210) that had some burned items and same problem (only +5vsb) too.
Will you please help me by marking the necessary steps - checks on the photos?
Thanks in advance for your help .
Some photos are:
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