My Samsung DVD-V5500 DVD/VCR combo gets no power when switched on.
I found out what the issue was with my Samsung DVD-V5500. It was the rectifier diode on the 15V tap of the high frequency transformer. This is the same issue that someone else with a later model V5600 had talked about. The diode had shorted and behaved like a piece of wire.
Seems to be a bit of weak point in the power supply. The issue can be diagnosed by using a multimeter to measure the resistance between the diode cathode and ground. If the meter is measuring 1 Ohm between the cathode and ground, your diode needs replacing. I just replaced it with a UF4003 diode from Jaycar, which is basically an Ultra Fast 200V 1A diode suitable for switching the high frequency (20-30kHz) output from the transformer.
The diode is located at the rear right hand corner of the board on the output of the power supply section. A picture below shows the new diode between orientated east-west between the large capacitors. The original diode that failed was an SHG2D SHS. 
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I have a Samsung DVD-V5500 DVD/VCR combo with a power supply issue. I went to use it and it would not turn on. I have checked the internal fuse and it is OK, however there does not appear to be power to the rest of the unit. I continued to investigate the power supply issue and have found that the rectifier is working correctly, I have 340V DC or 240*sqrt(2) (240V 50Hz Supply) across the filter capacitor.
However the switch mode part of the power supply doesn't seem to be working as I have nothing on the exit of it. I am hoping it is one of the switch mode power supply components that is buggered, just need someone to tell me how to troubleshoot this part of the circuit. Looking at the board, everything appears to be OK, there are no burnt parts or dodgy looking capacitors.
If anyone has any ideas on how to isolate the issue or has has the same thing happen to them, I would appreciate their input.
I had to unplug my entertainment system in order to reset my DVR cable box, and now my DVD/VCR player won't turn on. It is currently plugged in, but it won't turn on when I press 'power,' and it doesn't display a clock as well.
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