Huntkey model: Hkf1502-3b
I would like to share with you the good voltage testing of SMPS HK1502-3B for Lenovo All In one computer.
this is resonance Half bridge.
The 198VDC comes from the resonance IC supplying the Transformer for the 12VDC.
2. Check first the Big Filter capacitor using voltage testing (DC) with around 395 -400VDC if sometimes you see 350V check the Big Filter capacitor first but for me I all I encountered the IC for the resonance IC has issue if 198VDC is show this means that resonance IC is working properly.
3. Other issue mostly the POWER IC: TNY278PN and the defective starup resistor replace it with the value of 2.2Ohms.
You will see my attachments all voltages comes from the good working SMPS.
this is resonance Half bridge.
The 198VDC comes from the resonance IC supplying the Transformer for the 12VDC.
2. Check first the Big Filter capacitor using voltage testing (DC) with around 395 -400VDC if sometimes you see 350V check the Big Filter capacitor first but for me I all I encountered the IC for the resonance IC has issue if 198VDC is show this means that resonance IC is working properly.
3. Other issue mostly the POWER IC: TNY278PN and the defective starup resistor replace it with the value of 2.2Ohms.
You will see my attachments all voltages comes from the good working SMPS.
Attached Files
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