This could be a defective panel --is it like this on all inputs
SOURCE: Sony Bravia KDL 40S20L1
You should have a 1 year warranty from Sony. Call them before it expires. This is probably a LCD panel issue.
SOURCE: SONY KDL-52xbr4 - lcd panel shot after 17 months
This can be the panel itself, and or the matrix decoder/driver boards. The cost of this type of repair can approach the cost of a new set. From your description, I am thinking it is the panel itself that has failed.
Parts for your set are from Sony only because there is no third party manufacturing for these types of parts and assemblies.
Usually, when these types of sets become defective they are usually not worth servicing. During warranty the manufactures generally give a new set to the client, or they give a re-built set which has been built up using parts and modules from other sets that came back for service and had different types of problems.
If you know a tech is is good at servicing these types of set, maybe he can find a number of scrapper set of the same model to take parts from. You just have to hope the ones he finds have the same types of fault.
Jerry G.
SOURCE: 12 little horizontal lines in Sony Bravia KDL-52W4100
we have the same exact tv and it is not even a year old. we are told that it is the display panel and it is a well known problem with this tv. we were also told that there is a shortage of these parts. they had 283 on order, but only received 35. you need to call sony and tell them that you have this problem. they should warranty this for you even if your tv is 3 months past the warranty period. since this is a well known problem with this tv, keep on them.
Testimonial: "It in fact was a part of the lcd panel...the t-con board. I was able to research it and bought a box of parts off of a tv like mine and fixed it. Ron"
SOURCE: sony bravia kdl 46s4100 no picture
it sounds like your back light might be going out. You might be able to fix this by installing a new backlight inverter board.
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