Question about Sony FD Trinitron WEGA KV-27FS100 27" TV

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KV-32XBR15 power light on but no pic. notice coil burnt out and resistor fuse type 2.7 0hm near horizontal transformer. shuld i check other parts?

Posted by brett parussini on

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Simpson Neal

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Yes, you should check other parts. The horizontal output transistor is more than likely shorted. Also the flyback could have gone bad. Some SONYs have problems with the horizontal driver transformer which is connected to the base circuit of the horizontal output transistor. If this little transformer has a loose solder connection, it will take out the horizontal output transistor. This may give you some insight as to where to look for your problem. Stargazer

Posted on Jun 16, 2007

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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
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Have someone open and check in power supply on left side as seen from rear the .1 ohm protect resistor and the two regulators near it, and check for short to ground on horizontal output on other side mounted on metal--read from center pin to ground.

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you need to isolate the failure.
first, measure the voltage (called B+ usually) on the biggest elec. capacitor in the power supply. This should be about 130-160 Vdc.
If this isn't here, then the problem is in the power input circuit.
If there, then the high-voltage supply is down. If the set is anywhere near 10 years old, then replace the flyback transformer and its transistor (H.O.T.) and go from there.
The worst case is that a power surge or something has killed the TV's brain chip and you'll have to do a board replacement.
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Usually, in those Sony sets, a crack developes on a small transformer in the horizontal drive circuit, which causes the horizontal output transistor to short. This immediately shorts out the switching transistors in the power supply and blows the Sony 0.1 ohm resistor fuse. A shorted flyback (high voltage) transformer will also have the same result. The power supply does NOT need to be replaced. The parts should be replaced, the flyback checked and the board resoldered by a qualified tech familiar with Sony sets.
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