You are buying the essential components needed to repair one backlight inverter HIU-811 , HIU-812 or HIU-813.
You rarely need to repair both of those, so one set should be sufficient.
The components are the inverter driver IC and the 4 FET transistors driving the high-frequency transformers.
We strongly recommend that you replace all four transistors, even if some of the original ones test OK.
We also want to point out that sometimes there are other components on the board that need to be replaced.
Finally, since both inverters work together and wear out together chances are you are going to soon have to do on the other board as well.
All parts are brand new and we use it in our own TV repair center.
We - Coppell TV Repair - specialize in LCD and plasma TV repairs and we have fixed hundreds if not thousands of such boards - locally and through Internet.
Please note we can and will try to support your efforts within some reasonable margins, but we can not troubleshoot your board remotely nor can we spend the time to teach customers on individual basis.
If that does not sound right to you or if you doubt the quality of our product, services and advices please do not purchase from us!