Question about Sharp 27C-240 27" TV
Look for the horizontal output ("flyback") transformer, which has a red lead coming from it to a connection cap at the top of the picture tube. The horizontal section is that portion of the board. (There are other horizontal circuit parts on other areas, but most of the ones prone to failure are in the area of the flyback.)
Electrolytic capacitors have three important markings: the value (in microfarads, usually abbreviated MF or uF), a voltage rating, and a polarity (some brands mark the positive lead and others the negative, but there will be a polarity shown). If you replace a capacitor, stay with the same capacitance value, but consider a slightly higher voltage rating (but never lower). The replacement will be a little larger but likely would still fit, and under-rating is what causes most failures in the first place. Be sure to get the polarity correct when installing the new part.
Be careful working on your TV. Capacitors and the picture tube can store charges that can shock you even after the set's been off for a while.
Posted on Jan 12, 2009
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High voltage shutdown. The high voltage has exceeded 33k
and the unit goes immediately into safety shutdown. Check power supply
regulation and horizontal circuits.
Open the TV, and locate the power regulator section. Usually most Sony sets uses STR regulated type power supply in this stage. If any component related to this STR got faulty, this type of fault occurs. Mostly it may be due to a loose soldering and so on. The STR will heat up, and repeated heating and colling can make tis leg soldering to get loose contacted.
You just updie down the regulated section, and look for any loose sodering or bad soldering in that section. Loose soderings are very difficult to locate, as they may be microscopic in size. So I advice you to resolder most of the soldering points on that section, by applying a little more solder. Be sure not to make any soldering bridge shorts, when resoldering. Chek it out. In most cases this will solve the problem.
If not, replace thetow or three small electrolytic capacitors there, and recheck. When replacing electrolytic capacitors, make sure of its polarity, as they have both positive and negative legs, marked both on the body of the capacitor and on the printed circuit board. Make sure not to reverse the side, otherwise it will burst out when you switch on the Tv.
Do these and see the effect. If you need furthermore assistance, feel free to get me through fixya. OK.
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