Question about Televison & Video
The flashing led and the forced standby just mean that the TV is in protect mode because an internal fault has been detected. This is not necceraly pointing at the PSU, but just saying that there is an internal problem. The "bulged capacitors" have became almost an urban legend on the Internet, mainly because of the many prophanes that do not have experience in repairing TVs and electronics and that keep giving technical details online (well, sorry but that is the truth). Even when the LCD TV PSU is faulty you see "bulged and leaking capacitors" only in few occasions.
When the TV is in forced standby the TV must be tested thoroughly. I start testing from PSU, reading volts to inverter through the main digital controller board. This test will find the fault most of the time. In some case you do the same volt tracking with the TCon board. You also check connectors solder joints to ensure that there is continuity (soldering is good), and you check input output connectors and components nearby. In some case check also IR sensor and button board. If TV has cooling fans , check also that the fan are starting.
The testing involved requires reading volts with power on and jumping contacts in pcbs.For safety reasons the operations must be done by a trained technician.
In this case I think the unit is a combo, then it must be tested with internal DVD not connected.
Here description on how to test voltage line from PSU to inverter.
Before disassemblying ensure that you have tested the TV with no connected devices.
Posted on Jan 02, 2011
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.
If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.
I hope this helps.
Compliments of the season.
Posted on Jan 01, 2011
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Posted on Jan 02, 2017
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