I was having trouble with blinking red light, no picture or sound, checked and touched up several bad solder joints. Everything works except now I cannot receive Ch23-48. All other channels work, as does VCR and DVD connections. I use VCR to view all channels. PIP works as well except CH23-48, any ideas?
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Sounds like there a problem in the power supply circuit,Unplug the unit,and take the back off,with a ohm meter,check T603,and R672. Also check all solder joints for cold joints,bad connections,...hope this helps..
you wont believe this.. i tested all the pico fuses, and found them to be ok..tested for voltage to the fly backs, went on the check the rest of the "power board". things like voltage regulator, resistors, any thing that might look suspicious. so far the entire board had no signs of electical shorts. this lead me to think maybe a lose solder joint (a common fault with this circuit design). WELL you mite ask how did i test all those connection joints? I guessed, well almost, using a rubber handle screw driver, i gentle tapped the major components, included the snap in terminals. seems that where i tapped the tv came to life and then died..by viewing those areas the solder was dull, with slightly discolored surface around the solder joint and easy to spot . ..."there is picture & sound" when resoldered all the pins that i suspected as defective. testing several hours now..please throughly check, clean and resolder any suspected joint. hopefully this will work for anyone with a similiar problem..
Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://homenol.blogspot.com/ http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.
I had the same problem. Can't remember where, but I had to re-solder some joints. If you look very closely to the bottom of the motherboard, you might be able to see a cracked solder joint, otherwise carefully touch each one to fix it. Easy fix and the tv's been running flawless for going on 3 years now.
Be careful to not touch anything on the high voltage side with your hands. Even with it unplugged.
hello .this does sound like bad solder joints .all printed circuit boards do this after a while due to heating and cooling .is not advisable to try to repair yourself .possible electric shock and spiking .will do a lot of damage .take to a shop to have repaired
Your set has cracked solder joints, most likely on one of the small regulator transistors on the main board, with its own little heat sink. I have seen that many, many times, and it is a very simple thing to correct. Loose solder joints on the vertical output IC can cause no picture too, but it is usually those regulators that cause the problem. The set needs to have those regulators, the vertical output IC and all other major components resoldered and the set will play fine. If you do not have experience resoldering small parts on PC boards, allow a qualified tech to handle it for you.