Hi Guys.
I have experienced something rather unique and need to find out by the forum what to make of it.
I got in this set, a JVC or Telefunken LED TV whose complaint is that sometimes the set comes up blank with the back lights running. So I switched on and yes there was a blank screen and back lights were running. I checked the fuse on the TCON and sometime later I lifted the set off the table to check the image (the TV has no feet to let it stand upright) and noticed the set was cycling red, green blue, test pattern, blank then all over again doing this. Suddenly the no signal logo appeared and tv was working perfectly fine. I switched off and later when i checked it again i noticed that the set was cycling again in "self diagnosis" mode.
My questions are,
1. How does a LED TV with a separate TCON board go into "self diagnosis" by itself? I realize that "self diagnosis" is generated by the TCON, right?
2. Where to start fault finding? Main, LVDS, TCON, Panel?
I have checked the blue / white LVDS pairs on the cable while TV was cycling and did not get 1.2V, it was 0V. This tells me that the main board is not sending the data to the TCON, right?
Am i right in assuming that if you supply 12V to the TCON but with no data incoming the TCON starts to generate its own pattern?
This fault is perplexing to say the least.
Photo's can be uploaded later, i closed the set to do other work in the meantime.
Regards
Angelos
I have experienced something rather unique and need to find out by the forum what to make of it.
I got in this set, a JVC or Telefunken LED TV whose complaint is that sometimes the set comes up blank with the back lights running. So I switched on and yes there was a blank screen and back lights were running. I checked the fuse on the TCON and sometime later I lifted the set off the table to check the image (the TV has no feet to let it stand upright) and noticed the set was cycling red, green blue, test pattern, blank then all over again doing this. Suddenly the no signal logo appeared and tv was working perfectly fine. I switched off and later when i checked it again i noticed that the set was cycling again in "self diagnosis" mode.
My questions are,
1. How does a LED TV with a separate TCON board go into "self diagnosis" by itself? I realize that "self diagnosis" is generated by the TCON, right?
2. Where to start fault finding? Main, LVDS, TCON, Panel?
I have checked the blue / white LVDS pairs on the cable while TV was cycling and did not get 1.2V, it was 0V. This tells me that the main board is not sending the data to the TCON, right?
Am i right in assuming that if you supply 12V to the TCON but with no data incoming the TCON starts to generate its own pattern?
This fault is perplexing to say the least.
Photo's can be uploaded later, i closed the set to do other work in the meantime.
Regards
Angelos
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