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Re: tv will not power up
Sounds like a fuse or fuseable resistor may be open due to a short in the high voltage circuits. I would first check the Horizontal output transistor Q7460 and if that was shorted, I would replace C2455 (47uf/50v) as well to prevent a reoccurance of the problem. Of course with the prices of 27" TV's falling, it may be un-economical to repair.
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Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
The whine is a short somewhere---+ and - are marked on the board for each cap if it is polarized---usually the - will have a shaded white mark on top of board--if you got one in backwards it can explode......
If I understand your problem correctly, it sounds like the unit is not coming on... If this is correct, then replace the 3 capacitors on the output side of the power supply. There are [email protected] @25V and 1 smaller one which is [email protected] I think the part number on the board is marked as WX-15/19/20Power-01... This worked on a 19 curtis LCDVD191 Hope this helps...
your red crt bulb is starting to go bad.
somtimes you can tap lightly on the neck of
the red and the prob. usually short term will go away.
if not tube replacement is necessary.
this is sometime a pricey repair.
but worth it!