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LG TV: image = No. sound = Yes
Snuf3:
Hi Bruce
thanks for your test. I did it and you can see the results in the pictures: the cables config. and the result
I will describe it also:
when the red cable was connected and the white was disconnected = Nothing. Black Screen, sounds NotOk.
when only the white LVDSi s connected = > half panel is in white, sounds OK.
(The white in the picture is more strong the in reality).
Tell me what do you think. and something to wonder about - if this test teach us that the panel is NotOK. is it possible that the panel is OK and I'am dealing with a faulty cable?
Thanks
Adam
downunder:
You've done well with that test. So it looks like one half of the panel is dragging down the whole screen. Only thing left to do is to remove the covers on the two long strips along the bottom of the panel and check all the surface mount capacitors on the bad half for shorts. Both boards will have a fair similarity so you can do comparisons. If you come up blank with that, then almost certainly the panel is faulty. Bruce
Snuf3:
Hello Bruce
Listen I have a vocabulary issue. It's the first time I open a TV (but I am doing quite well thnx to you)
I attached a picture with the way I call the components, can you indicate which of the components is the panel?
after I will understand which part I need to check -I will check it. I imagine the it's done with the multimeter. is it's so - should I test for voltage or for the test with the beep sound?
I have also attached a photo of my idea of capacitor :)
Thnx again
downunder:
OK, so where you've written "end point", after you remove the speakers and the wi-fi module, you'll find usually 2 metal strips. Remove these as well and underneath you'll find 2 thin long circuit boards attached to the display panel (= panel). This also is the entry point for the 2 large flexies which are removable here if necessary.
These 2 long boards feed data into the display panel and it's on these that you'll find the capacitors, not the type you've pictured but tiny chips (chips) which are surface mounted and designated C---. Usually quite a few on each board. While you are there, make sure no liquid has found its way down the screen front and caused corrosion at the many flexies that are bonded into the panel base. This is bad news for a display panel and can also cause "no image". See how you go with that.
Snuf3:
Hi Bruce
first of all - have a nice weekend.
I took off the speakers so I can have access to the long boards. 1 picture == 1000 words so...
Pic No 1. I just verify that we are on the same page and this is the part.
Pic 2. The black arrow is what I understood to be a capacitor (tiny chip with cxxx).
the part I circled with purple color is something I checked for the "bip" test (it was ok)
the red arrow. should I check that? I see that at the end of each one there is a gold circle (is it for test?).
Pic 3. This is were I am puzzled . I don't know what setting I should have in the multimeter (what to check?) and if my checking method is correct (one side on the capacitor the other side on a metal board) and most important of all - what values to expect? how to know if I am in the correct range...
Hope I was clear. If not - tell me and I will clear things if I can.
Thnx Bruce
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