Question about Televison & Video
I need a spare or advice on fixing the backlight inverter on a relisys lv87e television
With the PWB removed from the TV, Measure across the outputs from the Transformer. The impedance(resistance) will be the same for all the outputs. You can find all open and some shorted outputs this way.
The DC input voltage is generally split amongst the Output transformers. you can pretty much measure from ground to points on the circuit checking for opens and shorts
Those things that look like a signle FETs are acually 2 FETS with the outputs tied together. This is tricky because if you are looking for a Single FET opposed to 2 you don't diagnose them properly. (this is only for the generic inverters provided with Samsung, CMO, LG,etc. Companies like Sylvania and Funai make their own so although the circuits the same it will be more obvious whats going on).
Just know that the inverter is usually composed of 2 to 4 identical circuits. Seperate the circuits then compare 1 to the other looking for differences. That difference is usually the defect.
Posted on May 27, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
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If you were to log on to the
manufacturer's web site, I think you will be pleasantly surprised as
usually one is able to download, by model number, Customer
Instruction Manuals, list
of Dealers for spare part supplies and Driver
Just Google the manufacturer's name and
follow the links. Make certain you are directed to the manufacturer's
web site as some search engines direct you to other sites and they
charge for the information that is normally free of charge.
I hope this helps.
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