When I power on, a pink blinking screen starts and a whole black screne behind it.
Sounds like a T'Con fault. Contact any service technician to confirm. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
SOURCE: my 32 inch westinghouse lcd tv's screen turned pink when on
your T-con board is failing you need a tech to replace it about a 150 dollar job
SOURCE: Westinghouse LTV32W6HD 32 in This television
Based on the symptoms you are describing it seems like your T-Con board is going bad. This board is located on top of the panel and its main function is to make the pixels properly display on the screen. When this board goes out you can experience a few things and normally red or blue spots in the dark areas is one of them.
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