Question about Sony KDL-40CX520 FULL HD 40 MULTI SYSTEM LCD TV
LCD Tv have not green color, image very reddish with green fine horizontal lines on top side.
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Posted on Jan 02, 2017
Most likely this is caused by a defective main board. Changing the main board will fix the issue about 95% of the time.
To be absolutely sure, the voltages need to be checked on the power supply. If they are not the values listed in the service manual, then you should replace the power supply instead (accounts for the other 5% of the time).
Posted on Oct 07, 2009
i have the same problem, apparently the LCD panel needs to be replaced and this will cost more than the tv is worth... Advice is to not buy a sony again, because this is a common problem and they wont extend the warranty, even if its 2 weeks after it runs out...
Posted on Nov 23, 2009
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 is the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This is caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
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 if this is busted resulting to black picture also.
Diagnosing the fault is technical and if you don't have necessary tools and test instrument and can't fix it yourself, I would advice you to look for an experienced technician to isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.
Posted on Mar 31, 2011
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