good morning! I have a problem with this Sony. The image has a pattern of black horizontal lines, I attach a photo of the lines. The power supply is external and emits a sound. I don't think it's because of that. Let's see if someone can help me.
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Sony KDL-50W685A horizontal black lines Pattern
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Originally posted by PontyPCs View PostLooks like a screen data line issue, locate the 8 data lines on the screen driver boards, and using cellotape isolate them, see if that cures the problem, works on most screens in various TVs
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Originally posted by nomoresonys View Post
Looks like it's bad, 4.8, suppose to be 19.5, you might be able to repair it or just try a replacement power supply.
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The power supply cannot produce 4.8v, if it produced such a low voltage, the TV would not turn on at all, which means you are not measuring correctly or the multimeter is not working.
First, try carefully cleaning the LVDS connecting cable from the motherboard to the T-con (contacts) on both sides with isopropyl alcohol...Last edited by lotas; 12-11-2023, 06:00 PM.
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The power supply is also not suppose to make any noise, so I wouldn't be so quick to rule it out. Make sure you are testing in dc mode, maybe test another power supply from something else and see what voltage you get.Last edited by nomoresonys; 12-12-2023, 12:45 AM.
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Originally posted by lotas View PostThe power supply cannot produce 4.8v, if it produced such a low voltage, the TV would not turn on at all, which means you are not measuring correctly or the multimeter is not working.
First, try carefully cleaning the LVDS connecting cable from the motherboard to the T-con (contacts) on both sides with isopropyl alcohol...
I'm going to start with the easiest thing, cleaning the flex. forgive my ignorance. how do you release it? I have never seen a flex like that. Thanks so much
2 Photos
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Originally posted by lotas View PostThe power supply cannot produce 4.8v, if it produced such a low voltage, the TV would not turn on at all, which means you are not measuring correctly or the multimeter is not working.
First, try carefully cleaning the LVDS connecting cable from the motherboard to the T-con (contacts) on both sides with isopropyl alcohol...
I update. I have cleaned the flex at both ends. It hasn't worked. In fact, yellow lines now appeared, some wider than others, until suddenly there was no image left.
Of course, I did a correct manipulation, everything turned off.
But I discovered something. The noise was not from the power supply, it came from the area of the controller boards, the area where the tcon is integrated. When the lines were no longer visible, and there was no image, the noise disappeared.
Could it be a coil in that area in poor condition that is causing the problem? Or could it be some tcon chip?
Thanks to all for the help.
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Originally posted by Raulnn View Post
I'm going to start with the easiest thing, cleaning the flex. forgive my ignorance. how do you release it? I have never seen a flex like that. Thanks so much
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update! I think it's a Tcon problem. The problem is that the tcon is integrated. I would say that the problem is in the DC DC converter circuit. Also, when I connect the TV the integrated DC DC converter gets hot. How can I know if it is the DC DC converter or another element? I have not detected short circuits in nearby capacitors. Let's see if someone can help me diagnose the DC DC converter. I cannot replace the tcon because it is attached to the panel. thank you
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Originally posted by Diah View Postyou have damaged the LVDS...,, so how it come after cleaning it produced yellow line as you stated... use your mobile camera to focus on the contact pins
the pegs are fine
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