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10-16-2020, 11:14 AM
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#1 |
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New Member
Join Date: Oct 2020
City & State: Albany
My Country: United States
Line Voltage: 120VAC 60Hz
I'm a: Hardcore Geek
Posts: 2
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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! |
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10-16-2020, 12:04 PM
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#2 |
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Badcaps Veteran
Join Date: Nov 2015
City & State: BC
My Country: Canada
I'm a: Knowledge Seeker
Posts: 1,006
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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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10-16-2020, 12:22 PM
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#3 | |
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Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,049
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Re: No backlight on Samsung LN46C600 - Fixed!
Quote:
BTW, this TV does not use LEDs for backlights.
__________________
Never stop learning 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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10-16-2020, 01:00 PM
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#4 |
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Badcaps Veteran
Join Date: Jan 2013
City & State: midwest
My Country: U.S.
I'm a: Knowledge Seeker
Posts: 6,020
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Re: No backlight on Samsung LN46C600 - Fixed!
Yep, that little bugger fails quite often.
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