The only way to tell if a backlight (if set has one) is bad is to measure the voltage on the power board and at the back light itself---most voltages are marked on power board or a Service Manual would pinpoint them.
If the voltages are normal and back light is on but DIM only option would be to replace the board that drives it or the actual back lights'
If you Google the model number with "parts" you should be able to locate the back the parts involved.
SOURCE: Sony Bravia LCD KDL32M3000 picture going dark
Sounds like it may be the backlight ballast on the inverter. Hopefully you are still under warranty, Call customer support even if you are out of warranty and explain problem.
In English: 1-800-222-7669 or 1-888-772-7669
Hours: Mon-Fri 8:00AM-12:00AM (Midnight) / Sat-Sun 9:00AM-8:00PM EST
In Spanish: 1-800-222-7669 - Follow the (English) voice path for your product, and then select the option for Spanish support
Hours: Mon-Fri 9:00AM-10:00PM / Sat 10:30AM-7:15PM EST
If they can't help let me know and we can diagnose the problem together. Let me know if this helps and please rate this solution. LOne99star
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/jason_77a19afa8d604dee
SOURCE: No Picture on TV when Power is on
This seet should provide some diagnostic help. The standby light should be blinking a repeated count with a pause. Post that count here. Also, is there sound?
The above info will indicate the problem circuit which will then suggest the remedy.
Thanks,
Dan
SOURCE: i have a sony bravia model # kdl-40s4100 40 in
If you have the led light on, then you need to replace the mainboard.
If no led light then replace the powerboard.
SOURCE: SONY BRAVIA KDL-40s4100 is not working right
Please check whether the connections are secured between the TV and the connected devices.
If the television is plugged into a power strip or surge protector, remove it from the power strip or surge protector and plug it directly into the wall outlet. If the issue is resolved, the problem is with the power strip or surge protector and not the television.
Try connecting the TV to a different wall outlet and check if that helps.
Please connect a different device to the TV and check whether the issue persists.
If the issue still persists service of the TV is determined.
SOURCE: MY SONY KDL-40S4100 IS ON STAND BY AND THE RED
The most likely the TV has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If by chance the TV is still under warranty, go that route.
If not under warranty and If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20.
I hope I shed some light on the subject for you.
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When I change the powersaver mode from high to off, it helps
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