Question about Sony KLV-37S400A 37 inch Multi-System HDTV LCD TV

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TV dead. How can i fix this without replacing the whole board?

I have checked the input AC volts all is well, i am not getting the 3.3V in the secondary to switch the supply on.

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You can try the troubleshooting section of the manual here: http://www.manualslib.com/manual/440142/Sony-Klv-32s400a-32-Lcd-Tv.html?page=36#manual

Posted on Feb 04, 2016

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Posted on Jan 02, 2017

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The external supply is just a potted 36-volt transformer with a center-tapped secondary. I bought an open-box Behringer (not your model, but similar) that was missing its supply, and found this transformer which works fine. (I actually did find a couple of sources for a replacement Behringer supply, but it cost more than I paid for the mixer!) Just connect the three output leads to the appropriate places on the mixer's PC board. In mine, I removed the original input connector and soldered a pigtail with a 3-pin connector from Radio Shack to the PC lands, then attached the matching plug to the transformer leads. You'll also need to provide an enclosure of some kind to prevent contact with the line voltage input to the transformer and to protect the thing if you carry it around.

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Hello Chris, Hi, your TV's power supply section is not functioning properly. If the fuse is in good shape, then the auxiliary power section of the power supply is not functioning, this section powers the switching oscillator and IC that sends the pulse to the switching element like power transistors to create a main secondary voltage. the main secondary voltage is the circuit that produces all voltage needed source by the TV. what you can do if you are up to it.
A. Visualize any bulging capacitors, replace them. B. Measure the voltage across the following section in particular order so we can find the faulty parts.
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  2. the AC after the line filter circuit. (none means open line filter)
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  4. then the AC on the switching element or input on the main transformer. (most likely you won't have any voltage reading hear.)if you do have continue.... (none means you scratch your head, this is the hardest part) check all low value resistors, high wattage resistors open or shorted diodes.
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If not have this checked by a technician, its to complicated for you.

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As a tip, sometimes the existing transformer has TWO 120 V windings, and sometimes only ONE side is used, for US power, and for 240 V AC, you simply connect the other winding in series, and NOW you have got your 240 V AC to whatever.

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