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Old 10-16-2020, 11:14 AM   #1
cabele
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Smile No backlight on Samsung LN46C600 - Fixed!

The screen was completely dark on a Samsung LN46C600. The power light worked normally, it made the normal sound when turned on, but just a black screen. With a flashlight you could see that the LCD was still showing an image.

Since ALL of the LED backlights were off it seemed pretty obvious that it had to be a power supply problem, rather than a bad LED (which might cause one LED string to go out).

It's pretty easy to take the back off the TV, removed the power supply board, and looked for failures. I didn't see it at first, but eventually noticed that CI818 was bulging. I found the power board schematic and some other documentation online (http://www.toms-service-manuals.com/), and it showed CI818 as 0.47uF at 450V. Digikey has the Panasonic ECW-FA2J474J (DK #ECW-FA2J474J) for just $0.81, which is 0.47uF at 630V. I replaced the bad part and the backlight worked again!
Attached Images
File Type: jpg LN46C600_Layout.jpg (75.7 KB, 9 views)
File Type: jpg LN46C600_PSU_Fail.jpg (990.0 KB, 14 views)
Attached Files
File Type: pdf BN44-00341B_Schematic.pdf (601.9 KB, 6 views)
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Old 10-16-2020, 12:04 PM   #2
neilc6
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Default Re: No backlight on Samsung LN46C600 - Fixed!

If you search your power supply part number BN44-00341B you will find lots of threads on this fix.
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Old 10-16-2020, 12:22 PM   #3
budm
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Default Re: No backlight on Samsung LN46C600 - Fixed!

Quote:
Originally Posted by neilc6 View Post
If you search your power supply part number BN44-00341B you will find lots of threads on this fix.
+1
BTW, this TV does not use LEDs for backlights.
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Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Old 10-16-2020, 01:00 PM   #4
nomoresonys
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Default Re: No backlight on Samsung LN46C600 - Fixed!

Yep, that little bugger fails quite often.
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