Hi all
Many thank for support !
I Have free time and go back to repair TDS520B
I checked follow your guide but dont help ... in second side of T6 - A17 (2) page 359 i dont have any AC out.
Next step i checked pinout of second side , i have missing oscillator in +-5V Rail-2-Rail
Missing osicllator in:
- Pin 7-8 T6 for +5V
- Pin E12-E13 T6 for -5V
- Pin E10 - E11 T6 - for 5V and 5.1V feedback
Other pin in second side have oscillator but don't have any AC output .
I active componant in second side i checked ok . No Mosfet burn, short, no diode fail or open , all cap and opamp replace.
I thing T6 have short winding in second side or burn in case . So if Transformer short , everything go to hiccup mode.
Many thank your support !
Nam.