I have this 60" Samsung that is 18 months old. When plugged in to AC, the red power led on the front of the TV AND the backlights flash in sync with each other once every second or so. This will happen indefinitely until AC is removed. I have unplugged the main board from the Power Supply and symptoms repeat as before. I have enclosed a few pictures to start, but will take more later as it is dark outside. Thank you.
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Samsung U60J620DAF Power and Backlights blink
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Re: Samsung U60J620DAF Power and Backlights blink
Andrew F. Ali - Expected to see STB-5V by the connector shown in the upper center of the attached photo, but did find this SB:8V on the power supply board. If it is somehow related, I got 3-5 VDC fluctuating wildly. It didn't match the beat of the power led and backlights but maybe my meter isn't fast enough.
Mr. CapLeaker - when plugging in to AC and seeing that flashing spell, I saw nothing that resembled picture. But with LEDs disconnected from PS and plugging in to AC, the power LED behaved normally and by turning on and hitting source on the remote, me and my flaslight were able to see the source menus at the top of the screen. The set powered down by itself shortly thereafter.
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Re: Samsung U60J620DAF Power and Backlights blink
A 60 incher is a big job. You would have to get a buddy to help you with this one. I use six (6) suction pads/cups. Three (3) at the top and three (3) at the bottom. Using long wooden broom handles, pass them through three (3) of the suction pads/cups handles and secure them with masking tape at the top and do the same again for the three (3) of the suction pads/cups at the bottom. Then from opposite sides lift together and rest it down on a carpeted floor covered with a bed sheet. This works for me. Luckily I don't get much 60 or 70 inchers to repair.
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Re: Samsung U60J620DAF Power and Backlights blink
The ones I have are 4-6" in diameter. They are used for lifting sheets of glass. Try e-bay as that is where I got mine from.
What voltages are you seeing on the Backlight LED + and - pins with the black DMM probe on the chassis GND.Last edited by Andrew F. Ali; 10-02-2018, 12:36 PM.
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Re: Samsung U60J620DAF Power and Backlights blink
Not exactly sure what I am looking for here, but all I can give you are values with the AC plugged in. With the LEDs disconnected from the PS, the TV will power up with remote but not for very long. So plugging in with the LEDs connected gives D+ =160 VDC. With the LEDs disconnected gives D+ =420 VDC. Both when LEDs are connected and disconnected, D- fluctuates around so much I can't really come up with good readings. Let me know if I am not giving you what you need and I can try again.
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Re: Samsung U60J620DAF Power and Backlights blink
Lift one leg of the diode D9001C or remove it off the board and then check the RESISTANCE in both directions of that diode, report the resistance reading, make sure that you do not touch the probe tips with your hand because I want to make sure it is not showing your body's resistance.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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Re: Samsung U60J620DAF Power and Backlights blink
Originally posted by MEB View PostNot exactly sure what I am looking for here, but all I can give you are values with the AC plugged in. With the LEDs disconnected from the PS, the TV will power up with remote but not for very long. So plugging in with the LEDs connected gives D+ =160 VDC. With the LEDs disconnected gives D+ =420 VDC. Both when LEDs are connected and disconnected, D- fluctuates around so much I can't really come up with good readings. Let me know if I am not giving you what you need and I can try again.
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Re: Samsung U60J620DAF Power and Backlights blink
Originally posted by MEB View PostThanks budm, always a pleasure.
Black lead on Cathode - 235.2K ohms
Black on Anode - 0 ohms
Appears to be SF28G. Thanks.
I think you may have the same diode failure like in this thread with the same diode P/N.
https://www.badcaps.net/forum/showth...t=72153&page=2Never 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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Re: Samsung U60J620DAF Power and Backlights blink
I would get a couple of them for either place then, and when you mount it on the board keep the legs long so the body will be 1/4 ~ 1/2 '' above the board to help cooling the diode.
https://www.badcaps.net/forum/showth...t=72153&page=2 the diode did fix the problem on that OP board.
I ask Jason to see if he can ship the extra one to you.Last edited by budm; 10-04-2018, 09:22 AM.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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