I would my self put the old boards back in and start again just in case one of the boards are faulty that you received due to you saying you have a different fault than before ?
Then download the training manual from here:http://elektrotanya.com/lg_42pj350_t.../download.html
i think its page 41 where it shows you how to jump the power supply to see if voltages are steady especially VS/VA,plus there`s more info in there for you to browse to hopefully pinpoint you to the fault.
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