Samsung UN40D6400 led problem
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Re: Samsung UN40D6400 led problem
Your board is Samsung BN44-00427B (PD46B2_BDY) Power Supply / LED Board?
http://www.shopjimmy.com/samsung-bn4...upply-unit.htmNever 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=24809Comment
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Re: Samsung UN40D6400 led problem
Check the CH1+, 2+, 3+, and 4+ (Anodes Voltage feeding pins) one at time by leaving the probe on one pin at a time and see how high the Voltage goes up too and then drops down, do that on all 4 + pins, Black probe on the chassis.
The drivers has 4 boost converter circuits to feed 4 stings of LEDs.
Pictures provided by shopjimmy.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=24809Comment
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Re: Samsung UN40D6400 led problem
I appreciate the help budm, do I touch those with the red lead and black to ground on the chassis? Can I do it with the led unplugged?
With the led unplugged the all got to about 320v for the high and then to about 240v for the low.
And then it cycled back up.Last edited by Malachi; 03-22-2016, 02:50 PM.Comment
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Re: Samsung UN40D6400 led problem
OK, LED connectors in place, Black probe on the chassis, red probe on the CH1+ pin, you to have leave the Red probe on the pin then turn the TV on and look at your meter when TV is turned on and then wait may be 5~10 seconds to see if the Voltage drops down, repeat the same on the other 3.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=24809Comment
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Re: Samsung UN40D6400 led problem
OK, as you leave the red probe on CH1+, you turn the TV ON then you see the Voltage jumps up to 325V and also see the backlights flash on then the backlights go out and the Voltage drops down to 225V, is that correct?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=24809Comment
-
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=24809Comment
-
Re: Samsung UN40D6400 led problem
OK now do it without the LED connectors in place.
They should all show high Voltage and really close readings to each other.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=24809Comment
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