Hi All
Sory my mistake . LED DS1 display .E not .e ( it's uppercase letter ) , so i thing have problem like broken trace or something like that.
It's TDS520B , not have much electrolytics capacitor. All cap i replace by new cap, esr have around 2.2R .
It's have 11 cap 33uF/10V and 10uF /35V .
So next time i desolder NVRAM and firmware IC to backup ! If anyone have Firmware or NVRAM data can share to me ?
Many tks you!
Best Regards
Nam Nguyen Hai