dear fellow I need your help

[selemanismail]

Tv Philips/model 21pt2160
Age 2 months
IC used at P.Suply MC44608P40
Fault: HT low, only 70v,.P.S. pulsates.I fit a bulb/lamp 220/40w, instead of the HOT the HT droped to 10v..Without load the HT goes to normal (115v).Now conecting the lamp again, it lit, keeping the HT. This conditions remain until next switch off. I checked/ replaced the IC itself, the tr driver(mosfet k2645) the optocoupler etc with no result.Any idea?