Question about Zenith P42W34P 42 in. EDTV-Ready Plasma Television
I had the exact same problem with mine. The TV clicks normally and the red
light at the bottom of the TV turns green. About 5 seconds later it clicks again
and the light turns red again.
I replaced the YSUS board and now the tv powers on no problem.
Posted on Jan 13, 2010
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 electroytic 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 is no way to identify the problem parts besides the date code if present.
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 solde side.
This same type of component in smalled 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, an plus/minus number lying about the precision.
Some also have a date code (rarer) that will look like 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.
Posted on Jul 09, 2008
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Posted on Jan 02, 2017
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