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Your backlight PCB board failed. today TV's can be removed and replaced very easy. Disconnect it, open it up and look for the damage board. you can order a new board from the manuture
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Check and replace damaged component/s at it main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis.
It sounds lamp in tv got broken as you heard pop sound of it, replace lamp in tv to fix the issue. Blinking light would be Lamp light at tv front that shows lamp is dead. Lamp replacement procedure is easy and mentioned in tv user manual. Thanks.
Don't know which boards Z or Y have dead capacitors pop open,take ur tv aparts check boards that have pop opens parts or burn marks on them.Replaced that board will solved ur problems.Tries Shopjimmy.com,Ebay.com to buy refurbish boards for the replacement.
Well if it is DLP TV then crack/ pop sound was broken lamp in TV and if its another kind of TV as you did not mention its model and brand then have to check accordingly.
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