I am trying to help out the neighbor. He has a Sharp LC-70LE757U that is flashing codes 2 - 5. The unit was working fine one day, he turned it off. Next evening, went to turn it on, nothing. Seems strange. Anyways, I am trying to keep in out of the "curb side dump". He got an "estimate" for fixing it that basically is replacing the panel and is pretty high so it isn't going to happen.
So I started looking at some of the service manuals for similar sets (ie.70le740, 70le835)... unfortunately there is no service manuals for this model on the nice "toms-service-manuals"... if it has common circuits to the other mentioned model, it would appear that the 12v supply to the t-con board is in "question" with this flash code. Supposedly, the estimate "analysis" checked some of the voltages and they were "correct" (relayed info from neighbor).
I further looked at this thread .... https://www.badcaps.net/forum/showth...rp+lc-70le732u... wow, great work all around.
Maybe, just maybe these are similar issues / "similar sets". This thread gave me hope that perhaps a similar solution can be found for our set.
Before I get my hope (and that of my neighbor) up too much, was hoping perhaps someone here might have access to the particular schematics for this set especially around the 12v pnl supply to help confirm similar operation and places to look.
Once I get the Tv back off, my checks would be to recheck that the 12v is being delivered to the t-con and that correspondingly that the det- pnl 12v is "high" (?).
Further to the above and based on the other thread, if the 12v is there at the power board and makes it way to the t-con board, but there is no "detect signal" being sent / set, then maybe I could try the same type of "trick" that the poster there and people on the forum helped with by "fooling" the system with a "diy signal". If this is the case, I am sure that the "estimator" would not have gone that far since it needs some "tender care" / "circuitry" for the "workaround". My fingers are crossed.
So can anyone provide me with any additional guidance and details to help lift a little of the "veil"? I have access to a scope and multimeter and some experience in general electronics troubleshooting but not alot in the TV area (more home audio and automotive).
I guess related to this, I can't believe that a 2 year old panel is the failure which I am sure they are quoting as the only solution. Do these failure that readily... yes I can see things like the back lighting, etc but the basic panel?
Lastly, no knowing alot about the inside design, am I correct in the understanding that the 12v supply is used to power the actual pnl LCD? If not, what? Thanks again for any help and guidance.
So I started looking at some of the service manuals for similar sets (ie.70le740, 70le835)... unfortunately there is no service manuals for this model on the nice "toms-service-manuals"... if it has common circuits to the other mentioned model, it would appear that the 12v supply to the t-con board is in "question" with this flash code. Supposedly, the estimate "analysis" checked some of the voltages and they were "correct" (relayed info from neighbor).
I further looked at this thread .... https://www.badcaps.net/forum/showth...rp+lc-70le732u... wow, great work all around.
Maybe, just maybe these are similar issues / "similar sets". This thread gave me hope that perhaps a similar solution can be found for our set.
Before I get my hope (and that of my neighbor) up too much, was hoping perhaps someone here might have access to the particular schematics for this set especially around the 12v pnl supply to help confirm similar operation and places to look.
Once I get the Tv back off, my checks would be to recheck that the 12v is being delivered to the t-con and that correspondingly that the det- pnl 12v is "high" (?).
Further to the above and based on the other thread, if the 12v is there at the power board and makes it way to the t-con board, but there is no "detect signal" being sent / set, then maybe I could try the same type of "trick" that the poster there and people on the forum helped with by "fooling" the system with a "diy signal". If this is the case, I am sure that the "estimator" would not have gone that far since it needs some "tender care" / "circuitry" for the "workaround". My fingers are crossed.
So can anyone provide me with any additional guidance and details to help lift a little of the "veil"? I have access to a scope and multimeter and some experience in general electronics troubleshooting but not alot in the TV area (more home audio and automotive).
I guess related to this, I can't believe that a 2 year old panel is the failure which I am sure they are quoting as the only solution. Do these failure that readily... yes I can see things like the back lighting, etc but the basic panel?
Lastly, no knowing alot about the inside design, am I correct in the understanding that the 12v supply is used to power the actual pnl LCD? If not, what? Thanks again for any help and guidance.
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