You posted earlier this year on changing a capacitor on a power board. Can you help in identifying this power board and capacitors? My model is the TL2020. From what it appears everyone who has bought this model has the same problem.
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Hi, It is always advisable to seek the assistance of a qualified repair technician to open up electrical items for repair. But since you say you are comfortable with electronics you can check the following: Your TV will have a power board, this is identified by being the first board where your electrical power goes to from the TV switch. On the board there are capacitors, faulty ones can be identified by being ;bulgy' at their tops. Replace these with the same ratings and take particular attention to voltages as well. These capacitors are likely to be located on the secondary circuit (the end nearest the output to other boards). It is advisable to change all capacitors in that region near the visibly faulty ones even if they do not show any bulged out top. Reason being that capacitors are rated per hours they can be on for so it makes sense that if similar ones have failed they may be very few hours left before the others fail too. I hope this helps.
Possible that the main power supply unit which is the SMPS- switch mode power supply- has a faulty capacitor or in the INVERTOR board which has changed the value and so the frequency being changed can cause higher huming level- reduced to lower frequency.
so check the board for leaks , if so replace. Also check if the threshold voltages are below level in these circuits. if so the capacitor can be identified. If there is change after the component heats then simulate the circuit board and confirm using a hair dryer.
The problem of your television is the power supply.The power supply is faulty because of leak capacitor.You can identify the leak capacitor through visual checking.The leak capacitor have bulging tops.Remove the cover and find the power supply located at the upper right and you can see the bulging tops capacitor. Replace with the same value of capacitor.
The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.
The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.
I do not think it needs replacement, rather some defective capacitors are causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.
The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)
You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.
What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).
You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored.
Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.
This problems happen to all LCD and Plasma tvs.In to 1 or 2 maybe 3 to 4 years old in used.The power supply board have these componnents parts call the capacitors,it will started to bulges up on it top,or puff up on it top.These capacitors are leaking gases and it dead.The tv will not power up and the LED power lite indicator start continuous flashing LED light.U know basic electronic's and soldering?Take the tv aparts where the power cord plug into it that ur power supply board.Searches all around the power supply board and it supporting boards,replaced all those dead gas leakage capacitors.Ur tv will power up normal again and work.Or Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
Buy the green light going on means Standby is ok. Next, would be to locate the plug coming from the main board to the power supply and find the post that says PO which means power on. With your meter on that post, press the power button as see if the reading goes High, if it does then the main board is able to turn on the power supply. Next, find the plug on the power supply that goes to the inverter( the long board on the side) remove it and see if you have 24 volts coming out of the power supply when you press the power. If you do, then the inverter board is bad, if you don't have 24 v, then the power supply is bad. There are NO diagrams available for these set other than a flow chart if you can find one. A regular svc tech does'nt need a manual for these anyway.
I don't remember exactly which ones I replaced.Look at the capacitors on the power board,and replace any that have the top,or bottom bulged out.The capacitors didn't cost much,maybe around $10 with shipping,depending on how many you need.Do you have your power board out?I hope this helps.If you have any questions,please let me know.
Thank You very much!