Question about Sony FD Trinitron WEGA KV-32FS120 32" TV

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Tv green light flashes but wont turn on

We have a sony trinitron tv that the green light flashes on and we dont get a picture, it sounds like its turning on but then flashes

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If there is no pattern to the flashes, it is just cycling, not producing an error code.  
This behavior may be the power supply but that may not be the problem.
Modern power supplies are designed to shut down if the current drawn exceeds the design level which indicates that something the supply services has died.
 
For gear made in the period of 2003-2006 and stock that is still on hand from that period, may contain electrolytic capacitors that have defective electrolyte, a chemical used in the manufacture of higher value capacitors.
The electrolyte was made from a stolen Japanese formula and improperly cloned in . . . where else? China.  
There are tons of electronic devices in service that will die due to this problem.
 
If you are adventurous, you might pull the plug on the set, gain access to the innards, and with good light, inspect any boards inside.
You are looking for components that are almost always cylindrical and mostly installed upright at 90 degrees to the board with leads passing through to the solder side.
This same type of component in smaller dimensions is still used in a horizontal package with leads bent down and passing though holes to the solder side.
The latter are becoming more rare since they don't lend themselves well to robot assembly.
Many (not all) will show signs of pregnancy when they fail, bulging unnaturally when compared with others. Now and then, there may be traces of a crystalline deposit around the end where the seal failed from internal pressure.      
 
These will have values listed on them in uFd & VDC and sometimes, a plus/minus number lying about the precision.
Some also have a date code (rarer) that will be four digits:
 
2403 = 24th week of 2003
 
Most electronics suppliers have a stock of the various values but if they have a date code at all, try to get only those made before 2002 or after 2006.

If you can't find any components that are visibly swollen, the supply may be cycling because of a power component, probably in the horizontal output that has shorted and it may have been dealt the death blow by a failed flyback or horizontal output transformer. This will be the largest single component you will see and will have a heavy lead coming from it that is attached to the CRT (picture tube.

To sort this out, you really need some technical skill and a minimum of a digital multimeter. 

Posted on Sep 18, 2008

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