I had the same problem with a 437. It just shut off one day and I could never turn it back on again. I called Syntax Brillian and they told me the mother board was probably shot. They sent me a new TV and took the damaged one back.
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Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
Tries tv unplug,replug it back like about an hour.By letting the tv resetting itself back to the tv factory setting.Now,the tv should be working again.If it still have the same result.Mean the tv power supply board,that the board where the power a/c plug into it.The causes and the problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
HI, the fly back transformer has failed in your unit. this will occur if the dust level is high inside the set. the dust will settle on the cooper windings and, create an arch that will short out the entire power sector of this unit.
The fly back is usually the first to take the hit. replacing this will fix this issue.
Welcome to Fixya! My Name is Travis! I have heard this Problem Before on Another Model. Turns out it was the Power Switch in that case. Yours has the Exact same Symptoms. Get that Checked and let me Know so we can go Further or if that is it.
The biggest problem you stated yourself. You bought aftermarket type IC's. You should have been smarter and purchased the correct IC's for the set. All IC's are not alike, even with the same number on them. Aftermarket IC's are just that. Built in China or are factory rejects. You might get away with replacing the iC's again from a reliable dealer or you might have messed up the power supply in the meantime. Good Luck