The CH DVD300 is notorious for power supply problem. If this the case, you can send the power supply to be repaired for around $15.00 to: Wired Communications 31211 N. 77th Way Scottsdale, AZ, 85262 Tel. 480-209-1700 Contact them before sending anything. Francis
SOURCE: My unit will show the red light for an instant,
Generally speaking, an amp protects itself from heat, shorts and overloads. Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up. You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it. If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good. If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.
SOURCE: During a thunderstorm, the power flickered off for
If the indicator light is blinking it is probably a faulty power supply. I just fixed mine today. Open the player up by removing the Phillips screws and locate the power supply board - this is the circuit board that connects directly to the incoming 120 Volt power. On this board look closely at the barrel shaped capacitors and note any bulging at the top of these capacitors. My 1000uf 16volt cap was just barely bulging so I decided to replace it with a piece salvaged from an old PC power supply. It is simply a matter of de-soldering the old piece and soldering in a new one. If you must purchase one you could probably get one from Radio Shack or Digi-Key for under a dollar. The replacement should be 1000uf and rated for at least 16volts or more.
SOURCE: viewsonic n4251w power supply, no start
Power supply is first place to look:
I see so many here with no sound/nopicture issues:
ISSUES:
1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.
Answers to issues:
1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.
2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.
Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.
What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.
3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.
4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.
SOURCE: mhc-rg222 red light blinks power button wont turn on unit
Check the back of the unit for speaker wire shorts, if everything looks fine suspect the output ic's in the stereo.
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