Morrfl, All lcd tv's (plasma & fluorescent lamp backlighted) have "smart" power supplys (ac line to dc) that are called "switch-mode-power-supplys" that can detect FAULTS with other circuits or with themselves and will go into what is known as SHUTDOWN-MODE when a FAULT CONDITION is detected. The SMPS does this to protect against having a catastrophic nonrecoverable failure! e.g. sparks, smoke, fire. There are many reasons that LCD tv's go into shutdown! However, your set is a viable candidate for repair. When you stated "picture turns off after 1 second" means it still has the capability of displaying information on the LCD panel! But don't do anything just yet about fixing it. Check the availibility of a replacement SMPS number DPS-336AP. The drop-in SMPS could have same problem as the current one because nobody has made the determination of the ROOT CAUSE of failure for this SMPS. All they know is that they fail!! You will need to read all the posts here on fixya and elsewhere to maybe???? find out ROOT CAUSE and exactly what component(s) fail and more importantly WHY! It is now 2009 and these LVM-37W1 units have been failing by the hundreds because of SMPS failures since 2007 or 8 ! Yet nobody has investigated to COMPONENT LEVEL why the SMPS fails. Well, all I can say is good luck guy. If you do manage to get it up and running again I would certainly like to hear back from you. try me at [email protected] or here on fixya. I'm 12fixlouie. Hope this was of some use! If yes please rate on fixya.
I also had a LVM-37W1- it would power up for a few seconds and shut off. I removed the power supply board and checked for bad solder connections. On transformer(T2) pin 4-which connects to capacitor (C311) there was a poor solder connection which would cause the tv to shut down. All operations were normal after that.
I just had my LVM-37W1 torn apart to check the power supply for the same issue everyone else has been having with the TV shutting down intermittently. I found the same issue with the bad solder joints on transformer(T2) pin 4-which connects to capacitor (C311). I resoldered the pins and the TV is currently working fine.
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The problem is definitely the power supply. It has a problem with being mechanically intermittent. If you tap the power supply it will shut down. I sent my power supply out for repair at a module repair company. It came back with same problem, they went over it again and it still had shutdown issues when tapped. They sent me another power supply they had in stock and it had the same shutdown issue. I wasn't sure if it was the power supply any longer. I took a look at the power supply and was able to repair it myself. If you want to know the repair, contact me at carneyke@localnet.**com (remove the **). Take Care
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