Question about Sony BRAVIA KDL-52V4100 52" LCD TV
Serial # 9051793. Have gone through all of the recommended owner's checks..power off etc. TV turns on, full picture for less than a minute then goes black. No LED lights flashing, steady green power LED stays on.
Nice TV ,but, is an LCD . most likely cause may be after long service life the 'Cold Cathode' tubes have begun to grow a carbon track down from the high voltage input . This causes the power supply for that voltage to determine too much load and shuts down . I am surprised you do not see a flashing LED pattern but this does not mean that the condition was communicated to the ECU .
That is a lot of tubes to change at about 40 usd for 10 pieces . It is also a Pain in your seat cushions to disassemble to confirm (ie: delicate connections to undo , mechanical puzzles to solve) I have seen Youtube videos of people converting to LED backlights with very nice results . It is possible but not recommended to change just the bad ones , you will soon have to do the rest anyway .
There may be a shop that does it often and could save $ compared to replacing with LED tv set that size or maybe a shop that converts(not me!)
Luck ... Hugh
Posted on Mar 10, 2017
SOURCE: TV Picture Goes Black
I had the same exact problem.
I removed the bulb and cleaned it. There is a small screen at the top of the bulb and it was covered with dust. Once it was cleaned I replaced the bulb and it solved the problem.
Thanks to those who posted the solutions
Posted on Sep 14, 2008
Most likely this is caused by a defective main board. Changing the main board will fix the issue about 95% of the time.
To be absolutely sure, the voltages need to be checked on the power supply. If they are not the values listed in the service manual, then you should replace the power supply instead (accounts for the other 5% of the time).
Posted on Oct 07, 2009
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