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Power on the unit in the dark room then shine with the flashlight directly in the screen, you will barely see the images. This is because your backlight is not functioning. The following reason was the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. The B+ produced an out-of-regulation condition and drives it to overload which caused the symptoms. Look for leaky/dried electrolytic capacitor, sometimes it has a bulged/dome at the top but not all, you must have a capacitor checker to determine its condition.
2. Inverter board - even the B+ is good from the power supply, if the fuse, driver transistor, driver transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - even inverter board is good but one of the backlights was already busted, it will trigger the protection circuit and will shuts-off the B+ to avoid overload to high voltage transformer.
Diagnosing the fault may technical if you're not handy with electronics. If you don't have necessary tools and test instrument and can't troubleshoot the symptoms yourself, I would advice you to look for an experienced technician to isolate the problem.
Also, check if your unit is under warranty period, avail it because the manufacturer will fix it for free. Don't attempt to open the back cover(it will void the warranty).
Hope I helped you.
Have a nice day!
Thanks for using Fixya.
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I had a similar problem with my 42 in Philips LCD HDTV.
Here was the problem.
My Power Supply Board had several bad capacitors. I opened my TV (warranty was expired of
course) and found four bulged capacitors on the PSB. Many major electronics companies Philips/Magnavox,
Sony, Panasonic, and others were sold capacitors that failed in 2-5 years
instead of 10-20. The capacitors fail
prematurely due to a lack of preservatives. Unfortunately, they were installed in all
sorts of devices and cause a wide range of failure problems.
Here are some options for you.
1. Have it fixed by a professional $$$$$$$??????? (Is it
2. Open your TV and find PSB. (The board that the power cord
plugs into) Check for faulty caps. If you find some (bulged or leaking) bad caps
replace the entire board. The entire
board costs around $250 right now because they are in high demand right now. They
can be found at tv-part.com but supplies are limited. I would definitely shop around though.
3. Remove and then replace individual faulty caps. This takes some soldering skill.
Caps are inexpensive and if you can take care of it yourself
it will save you hundreds.
I have a tip/tutorial
on this site that may also help. It
gives step by step instructions for replacing caps on PSB #715t2432-2. If this is your board you are in luck. It's called: Fixing
the Philips Turns/shuts off on its own problem. I'm working on uploading pictures to help
guide people though the process as well.
Let me know if I can do anything to help.
Hope this helps and Good luck.
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