Lg47lf65 tv only 18 months old has stopped working totally. had a look on main board and with a tester found out primary all working but a blue coloured capacitor then joins the secondary and there is no power running through this, is this repairable and how? blue capacitor has number cy104 next to this can any body help please

Change you hdmi connector.

problem see related to main board or compressor

main board problem , please replace the specific main board .

The battery interface has broken away from main board at the limit stop. Requires trained tech to repair. You mentioned these are new.. Cf 18 have been discontinued for years. Are these cf19's

You are going to need the main board (it has TV Tuner, source inputs, sound processor, etc)
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You have a blown fuse on your main board. Call LG customer service for your options.

Yep, your mainboard is damaged.

Replace it and your tv will work again

LN-S5296D - Cheap Fix, replace the blown capacitors on the power supply, 1000 uF - 10V (anothe forum member reported that they used 35V capacitors to replace), less than $10 in parts and takes a little basic knowledge of electronics and soldering skills. I had 3 bad capacitors, some report more or less.
Expensive Fix, replace the entire power supply board, BN44-00150A, $140. If you can replace a computer motherboard, you can do this.
I ended up ordering and replacing the power supply board but after looking at it, I could've just replaced the capacitors. They will show a buldged top or there will be some black goo oozing out of the X's area at the top of the capacitor. Oh well, I now have a spare board for the future.
Symptoms: Blue light on, would not turn on. Unplugged waited and plugged back in the Blue light did not come back on but after a few minutes it did. Unplugged for about a week then the TV came back on but after shutting off it came back on and the picture was a garbbled and pixelated, no sound. After shutting off the blue light was flashing and would not turn back on.

I had this exact same problem. After a week or so it started responding to the remote control again. Then after a couple of days it stopped responding. This problem came and went for about a month, then one day the entire TV went dead. When I powered it on, the green light appeared for 2 seconds followed by a sequence of 6 flashing red lights that repeated. I brought my set in to a repair shop and they replaced the power supply board. That fixed the problem and now the TV powers up and responds to the remote control again. Total charge was $250. That was very disappointing for a $1,500 TV that was only 18 months old. I'm going to let Philips know how disappointed I am in their product!

Had the same problem, took the back off and found some bad soilder joints on two of the main circut boards. Re-soildered and appears to be fixed.