Hello.
I have a SAMSUNG TV set, model: LE40A656A1F.
Multicolored stripes appear on the TV matrix, half of the screen is obscured by them. Sometimes after the receiver is turned on (once every 10 turns on), the image is generally correct (there are vertical lines in places - depending on the scene displayed on the screen) - the following photos present this situation:
If the TV starts up with a working screen - this condition lasts all the time - the screen (TV) works properly.
However, in most cases on the LCD matrix, after turning on the TV, there are stripes shown in the photos below:
After opening the housing, I cleaned the contacts on the ends of any tapes exiting the controller into the matrix with a contact cleaner. However, it did not bring any improvement.
I am surprised that the TV sometimes starts up correctly - if it had a driver / matrix defect - such a situation would rather not occur.
The operation of the TV is not affected by temperature changes - if turned on correctly - it worked for up to an hour. I tried to change the temperature with the freezer near the tapes - to no avail.
I wonder what could be causing this problem. What else can I check?
edition.
I attach a photo of electronics:
I can also add that the stripes (when the TV starts up correctly) - dominate the brighter displayed images.
I have a SAMSUNG TV set, model: LE40A656A1F.
Multicolored stripes appear on the TV matrix, half of the screen is obscured by them. Sometimes after the receiver is turned on (once every 10 turns on), the image is generally correct (there are vertical lines in places - depending on the scene displayed on the screen) - the following photos present this situation:
If the TV starts up with a working screen - this condition lasts all the time - the screen (TV) works properly.
However, in most cases on the LCD matrix, after turning on the TV, there are stripes shown in the photos below:
After opening the housing, I cleaned the contacts on the ends of any tapes exiting the controller into the matrix with a contact cleaner. However, it did not bring any improvement.
I am surprised that the TV sometimes starts up correctly - if it had a driver / matrix defect - such a situation would rather not occur.
The operation of the TV is not affected by temperature changes - if turned on correctly - it worked for up to an hour. I tried to change the temperature with the freezer near the tapes - to no avail.
I wonder what could be causing this problem. What else can I check?
edition.
I attach a photo of electronics:
I can also add that the stripes (when the TV starts up correctly) - dominate the brighter displayed images.
')
)). The idea is to heat up with a heat gun the places where processors are mounted in BGA housings on the T-con board and then, under the influence of heat, the processor settles firmly on the BGA tin balls. You have to do it quite delicately so as not to overheat the processor and blow out small SMD components. It is best to cover the processors (in our case, 2 pcs) with aluminum foil to protect the adjacent components and then heat the processors with a heat gun (without heat sinks and rubber bands, of course, because they will melt), then wait until it cools down and reinstall the plate on the TV. If it does not work, I will take the risk and replace the new T-con (cost about PLN 200 - checked used) as it turns out that the matrix will be PLN 200 in the back and in the dark d .... spitting on Samsung quality (the TV is over 2.5 years old) ) but you can always sell it for parts and collect for a new TV (from the competition). I will do my tests with the heat gun only on Monday because now I do not have access to the equipment. If you try to do the above steps, let me know how it turned out, because I'm curious myself. If there are any experienced service technicians here who have encountered a similar case, it will be very nice to say (maybe I'm going with my ideas not in this direction, but for now that's the only thing that comes to my mind). Regards
