Question about Philips 42TA648BX 42 in. LCD TV
Shuts off by it self.when i try to turn it back on it comes on and stay on a while maybe 15 mins.sometimes i turn it on and i turns off right away .could it be over heating from dust binging inside of it if so what is the fix thanks .
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Posted on Jan 02, 2017
My screen is black, why do I not have a picture?
Answer Antenna is not hooked up to television.
Blank screen when connecting to the accessory (DVD, STB, PC) device via HDMI to HDMI.
Posted on Mar 05, 2008
I had the Same issue. on a 50PF9431D/37 set. Many Plasma Set's use a LJ44-00118A PS-505-PH Power supply from Samsung. Known to have this common problem. If you can, or have a friend that can Solder components?. Unplug your set remove the back panel & locate your power supply. It will be the PCB in the center of the set just above the Video/Audio connections. http://www.shopjimmy.com/power-supply-unit-lj44-00118a-from-philips-50mf231d-40.htm. Is a Link to a photo of the PCB. Make a note of the locations of all cable connections then unplug them all. Un-install PCB, Check all Fuse first. I believe their is 5 or 6 of them on the PCB. Then replace the two 3300uf 10v 105C Radial capacitors at C8060 & C8059. Look to see if the Caps are deformed and or split at the top. The location of the caps are in the Lower bottom edge of the PCB. A local shop may Carrie them if not, digi-key has them. Part # http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=493-1754-ND. Total cost was $7 with S/H.
Posted on Jun 25, 2009
I think I know what your problem is.
I am going to give you an explanation in simple terms. I suspect (I have seen the exact same thing several times) that you have puffed up caps in the power supply.
They are also called electrolytic capacitors.
All LCD, PLASMA, and even desktop computers use a power supply that is up and running 7/24 even if the unit is not turned on.
It is called a STANDBY power supply---I am going to take a photo so you know what the suspected parts look like and attach it here.
The reason this happens is many companies cut corners here--these caps are rated at a specific capacitance and WORKING VOLTAGE--the working voltage is the max voltage the part can tolerate over time.
The way they save money is most of these power supplies in STANDBY are about 8 or 9 volts and they put caps rated at a MAX of 10 volts--after a year or two the caps dry out inside and the tops of them puff up--having trouble getting to turn on--having to unplug it and try several times to get it on is a dead giveaway this is what is wrong---as time goes on it gets harder and harder to get it to come on.
The reason companies do this is if they make 10,000 sets and use 10 volt caps instead of 16 or higher voltage rated caps---they save a nice piece of money---they do not care if it only lasts a few years--they will be clear if it makes it through the 1 year warranty.
If someone opens the set and follows the power cord it will take them to the power supply board. Look at the two photos---notice the one with the silver top of the cap---bad ones will be clear to see---the top of them will be puffed up and NOT FLAT.
If this is what is found you have two choices--replace the caps--parts cost should be under 30 dollars for the parts OR REPLACE THE POWER BOARD--the board will be EXPENSIVE---confirm actual full model number and I will try to get you a part number and price for it.
The new board will work but have the same substandard caps in it and in a few years fail the same way.
Sooner or later when enough caps puff up---the set will not turn on at all.
I just fixed one of my desktop computers with this exact same problem--parts cost me 12 dollars and I upgraded from 10 to 16 volt caps---50% increase in ability to handle the voltage.
I have seen this in dozens of newer sets.
Let me know if I can help you further and if this information helped you rate this solution as I do this here for free.
Posted on Dec 27, 2009
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