Samsung recent models can do as yours for only motivation bad backlight, the square is now possible damage by mains spike, damaged both main board and B.L. leds, your work is done well until now, do not give up, maybe take some break days an then under to replace strips, not sure 100% is faulty strips, but the non working BL PS board can be due to overloaded by shorted bars, freeing the panel's load the leds turns back half on, the PS is for me for supply the entire panel, back and front..
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Thank you very much Davi,
needed a little break but have ordered the Backlight strips and now waiting for them to arrive. Didn't know that a faulty Backlight can cause so many more defects. I couldn't explain to myself why so many different things were damaged
Thanks for your explanation... will disassemble the TV tomorrow and hope not to damage the panel. Honestly... This TV is so overly complicated and the whole electronic is designed not to be repaired by someone. But this is just a beginners opinion.Comment
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No the backlight can't damage other boards, it's the mains spike that can damage several parts..Comment
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This is not true, bad backlights CAN damage a powerboard.Originally posted by Davi.p View PostComment
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My Backlight strips have finally arrived, so I replaced the faulty strips with the new ones. One LED was burned and this was on the left side. Was a little bit scared but I did everything very slowly and carefully.
The swap of the Backlight strips was successful but I have no luck with this TV 😪 The already mentioned Buzzing noise is still there and there are more faulty components. The voltage on the diodes is OK but not one FET. This FET is exectly for the Backlight strip that had the shorted led on it.
So.... the search goes on. Have to check every single component in this circuit and find the defective one. This TV gives me a big headache.Comment
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Can you point well which diodes / fet are talking of? Have you checked D9101C and D9201C? and the other axial diodes on secondary?Comment
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