No power All of a sudden it won't power on, from power button or remote. I unplugged it, checked the outlet, let it sit for a while, checked the remote battery, talked nice to it, etc. What's up?
Televison & Video - Cyberhome - CH-DVD 300 DVD Player
Answers & Comments
Check voltage on the two extreme wires of the CN2 connector on the power supply board. On the yellow wire has to be 12V against one of the black wires (GND - ground, negative) and on the red wire you must measure 5V. If voltages are bellow this levels there is a problem with the power supply. In most of cases the 2200uF/10V capacitor is blown. I recommend to replace all the electrolytic capacitor of the power supply board with new ones. Observe capacitances and voltages of the new capacitors! You can use higher voltages (but never lower!) but the same capacitances. You can make it with little soldering skills.
Have a good luck and sorry for my English...
Jirka
http://www.hlucnisousede.cz
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Hi,
If there are no indicators that it is receiving power such as timer/clock, standby light, whirring sound when first plugged in, then initially, it would be safe to say that the internal power supply is the culprit. For the moment, course of action would be:
- confirm power availability on the outlet (which as you posted performed already);
- check the AC cord/powerline of the unit with a continuity tester;
- check the fuse (inside);
- check for the presence of standby voltage (normally +5).
Of course most of the above would require opening the unit which needs a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
@dreamwvr,
Appreciate your postback and comment, likewise the rating.
@phillipslane, oxer & muskymike,
My apologies for the very late reply. It is only when dreamwvr posted anew that I was informed that there are other postings of similar concerns.
To address your problems. The power supply is basically an SMPS (switch mode power supply) very similar in design and principle to the power supply of your PCs. The 120 VAC is first converted to about 180~200VDC that supplies a high frequency circuit which then feeds the transformer, The output is high frequency high current which in turn is converted/regulated to the required DC voltage of the CH-DVD 300.
Most SMPS design has a 2 X 2 (4) terminal optical coupler as well as an 8 pin controller IC on the secondary side. Repairs would be facilitated if you have a copy of the service manual or at least the schematic diagram. In the absence of those, style="display:none;">@dreamwvr,
Appreciate your postback and comment, likewise the rating.
@phillipslane, oxer & muskymike,
My apologies for the very late reply. It is only when dreamwvr posted anew that I was informed that there are other postings of similar concerns.
To address your problems. The power supply is basically an SMPS (switch mode power supply) very similar in design and principle to the power supply of your PCs. The 120 VAC is first converted to about 180~200VDC that supplies a high frequency circuit which then feeds the transformer, The output is high frequency high current which in turn is converted/regulated to the required DC voltage of the CH-DVD 300.
Most SMPS design has a 2 X 2 (4) terminal optical coupler as well as an 8 pin controller IC on the secondary side. Repairs would be facilitated if you have a copy of the service manual or at least the schematic diagram. In the absence of those, data sheets and application notes of the earlier mentioned optical coupler and controller IC could provided basis for working voltages.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.