Question about Projection Televisions
If the power light is flashing and the screen wont come on then the power supply is failing and you will have to call an engineer to fix it up.
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Posted on Apr 30, 2008
There are a few members reporting the same issues with different brands of LCDs. The majority have power supply failures due to the amount of heat that is generated when the TV is on.
A good number of power supplies can be fix to the component level, since there are not many places that carry the service parts to fix the TVs.
I would suggest to try to find a TV technician to fix. This might not be a DIY project.
If the TV is less than a year old still under manufacturers warranty.
Posted on Apr 30, 2008
This is most likely due to 2 problems -Temperature or a bust
1. A PCB may crack about some of the larger components. You can inspect the PCB's for fractures, and then repair them. It may also be poor soldering that has failed. I would be checking for these things first.
2. Powering down the set fully may have also allowed the power supply to cool, weak capacitors often go out of spec when they cool, this preventing may have prevented a section of the power supply from firing up properly again. There is a simple trick...just warm the back of the TV with a hair dryer for 5-7 mins after you have unplugged the TV. Look for the little areas of holes in the back panel of TV. Use these as your guide at where to use the hairdryer, but don't hold the dryer too close (say 5-6inches away). (Make sure the dryer is on High heat). If the TV doesn't turn on after you have heated it up (like it tries to come on but then turns off) you need to unplug the TV again, this resets it. And repeat those steps till it works. Resetting the TV after it fails to turn on is the key. Also, just leave the TV on. Don't turn in off. Since it is LCD, it doesn't take much power...only a few bucks extra a month for your utility bill.
3. You can also try plugging in the TV through the USB on its panel to a computer or USB charger, and it may work. However, this is only a temporary solution.
4. If you want to go in for a long term solution, you can easily replace the whole power board or just change the faulty capacitors. You will have to open the back panel and take a look. You can make out which are faulty, because their caps will be swollen on top. Here's a pic:
Check the specifications of the faulty capacitors, and get the replacements from your local electronics shop. If you are comfortable with this, you can use a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors. Once that is done, solder in the new capacitors carefully. If are unsure how to do this, try to get a friend who knows how to do this kinda stuff do it for you, or get a qualified technician. Warning: If you do not have a background in electronics repair, or are inexperienced, get a qualified techie to do it for you.
Clearly, electronics expertise is needed at this point, and if you had electronics knowledge you would have solved the problem already :) So I don't recommend poking around on the inside unless you know what you are doing.
LCD TVs do not have high voltages inside like the old CRTs, but power line voltages may still be present and give you a bad shock.
Also modern CMOS integrated circuits (or chips) inside digital equipment are very(!) sensitive to over-voltage, short circuits or even static electricity. The simple act
of touching the wrong chip with your fingers can destroy it. A static shock too weak to give you a tingle, is strong enough to blow the integrated circuits inside your TV.
PS. The capacitors are usually 680 - 1000 micro farad and 16-35V.
You can buy the capacitors online from HERE or HERE if you wish..They cost $0.068 - $0.85 each, depending upon the model.
REMEMBER there are very dangerous voltages inside a TV that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT THE POWER BEFORE YOU DO ANYTHING.
Hope that helps...Should you have any further questions, please feel free to post them here.
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Posted on Apr 30, 2008
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