My DVD receiver HT762 does not switch ON. initial check on the power supply shows 330V DC on the first power supply. The next supplies using flyback regulator IC 6252 and UC3844 do not work. the voltage at pin 5 of 6252 is only 7.2 volts. the other current mode PWM controller UC3844 BN does not switch on at all.

Power supply problems. There are many reports on this site for problems related to the cyberhome dvd player, one of them mine. Here is what I found. The dvd drive was ok it was the power supply that failed after a power surge. The power supply is a flyback power supply using the viper22 switcher by STM Microelectronics. you can download the specs with a schematic diagram simular to the one in the cyberhome unit. I wound up replacing the shunt regulator (TL431) Optical coupler (PS2561-a-1) , the 2200uf cap and the 1000 uf cap. this brought the 5 volt output to 5 volts which was the problem. The parts can be ordered from Mouser Electronics.
1000uf @ 10 volts PN UHE1A102MPD
2200uf @ 25 volts PN UFW1E222MHD
TL431 PN 512-431CLP
PS2561 PN 551-PS2561-1-A

Warning: The high voltage side of this power supply has 120 VAC and 161 volts dc when energized. thak precautions when measuring the voltages on the output. Good luck