Cyberhome CH dvd-300
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
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