Samsung model LN46A750R1FXZA lcd tv dim at first turn on, but comes to normal brightness in a few minutes

SOURCE: LCD TV won't turn on, Screen and Standby light blink

I had a similar problem which I have partially solved. The power light flashing could be due to a shorted electrolytic on the power supply board but in my case it was a shorted IC on the main board, the one with the input connectors. The IC marked 7001 shorted and got hot enough to melt the plastic. Replaced it with a new one from Mouser. The supply measured on the end of inductor 5001 farthest from the IC reads 12V now. This is a surface mount part and has a pad on the bottom that may be soldered to a pad under it. I had to cut the IC apart carefully with a Dremel cutoff wheel to remove it. That fixed the problem with the light and the remote now turns the TV on and off so the logic is working.

I now have the problem of the backlight not turning on. The driver board, the ones with the transformers, are made by Intechwave, the only info I can find is here: http://www.peopleworks.co.kr/kor/product/product_list.php?intDivision=4&intClass1=16&intClass2=41

This a 45kHz RF driver and it is not starting. If I can figure out why I'll post it for all the people who reported slow or no turn on of the backlight. These boards should have 24V between the red wires on the connectors and ground, as mine do.

SOURCE: 40 inch samsung it tunes and clicks 3 times before coming on

replace swolen capacitors on power board.

SOURCE: Samsung 50in Plasma tv picture issues.

buffer board needs replaced need to replace both

SOURCE: viewsonic lcd tv turns on a few minutes goes off model:vs11335-1m

REMOVAL OF REAR COVER VS11335-1M

SOURCE: When I turn on my

This problems very common on a LCD tv.It the tv power supply board,have bad dying capactors,these capacitors are alway bulges or puffing up on it tops.That the board,where the power a/c cord plug into it.U have all the tools,know basic electronic and can do basic soldering?Just check the power supply board,for those dying capacitors that bulges or puffing up on it tops.Replaced these dying capacitors on the tv power supply board,ur tv will power up normal again and have no more clicking sounds and will not take anymore 2 mins or more to turn it on.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.