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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
Samsung QN75Q6DRAF power cycling on/off

 

 


cholmes28
New User

Sep 27, 2022, 5:44 PM

Post #1 of 3 (269 views)
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Samsung QN75Q6DRAF power cycling on/off Can't Post

I have been trying to repair this TV, and have had great success replacing boards on other TV's but this one is not cooperating, and I am trying to figure out if it is beyond repair. When I plug it in, the backlight comes on, then 3 sec later the TV powers off, then 3 sec later comes on. When it comes on, I only get the faint blue screen from the backlight. If I unplug the cable from power board to main board, the backlights remain on, and it does not power cycle. I tested voltage on the power board and did not get the 13V, so I replaced the power board which did not fix. Then I replaced the main board, and this did not fix.

Then I found a video suggesting that one of the flat ribbon cables from main board to display could have a short, so I followed the video and put a small piece of masking tape over several of the terminals on the ribbon cable, and this enabled the TV to power on, and I got a full picture, however, there were 2 vertical lines in the center of the picture, which I thought was due to a bad ribbon cable, so I replaced it, but now without the masking tape, it went back to powering on/off. If I unplug the ribbon cable, it no longer power cycles. Only thing I can think of is there is something wrong with the LED board that the ribbon cable connects to, but then why would I get a full picture when masking several of the terminals on the ribbon?

Anyone have any ideas on what I can try next, or is this a lost cause? I have some photos but not sure how to upload them.



Redomega
New User

Sep 27, 2022, 7:26 PM

Post #2 of 3 (261 views)
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Re: [cholmes28] Samsung QN75Q6DRAF power cycling on/off [In reply to] Can't Post

Hi, have you had any joy with this issue? I have just posed with a similar issue, but had not noticed your post first. The tape on the flat ribbon is something I have not tried yet, could you please share the link to the video you saw?

Thanks


cholmes28
New User

Sep 27, 2022, 9:41 PM

Post #3 of 3 (257 views)
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Re: [Redomega] Samsung QN75Q6DRAF power cycling on/off [In reply to] Can't Post

https://www.youtube.com/watch?v=YDm0Hhcf_U8

 
 
 


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