Hello everyone,
I am slowly going crazy over a problem, please help me out, if you can.
Long story short: I got a LE40B530 that had a mainboard issue. Power supply checked out fine, so I decided to buy a replacement main.
I bought a mainboard from a local guy, but he told me that this board may not function properly. He is no expert, he removed it from his broken screen set, sold it to someone, who sent him back because it "froze". His tv was also a LE40B530. Only difference is that his mainboard is BN94-02710T, my original was BN94-02710M. For me they look identical, and googling what the difference is between the "T" and "M" did not gave me any results.
Anyway, I gave it a try. My set turns on, works perfectly fine, until a few minutes pass by, then it doesn't react to the remote controller.
It receives the signal, the standby led blinks but nothing happens.
I followed the path of the signal, it goes into a chip named IC3003 (WT61P8) and I believe that the problem is related to this IC. When the tv is on for about 5 minutes, this IC gets warm (it doesn't get hot no matter how long the set is on) and the set no longer responds to the remote. BUT if I cool down this IC, it works again! More strange things are coming: in this state, the power button still works, but not as intended. If I push it, the standby led blinks, that it received the code, then I wait about 2 seconds, and it turns off. But not as it should, because on a normal shutdown it plays a melody. In this case it just turns off. I attached photos of the main and the suspected IC.
In addition, the set looks to operate fine from the buttons on the side. The buttons are wired to the same IC, but on different pins.
Any idea, what should I measure? Where should I look for the problem?
I've tried so far:
-change the eprom between the 2 boards
-change this IC between the boards (it got worse)
382533328-Samsung-La32b530p-La37b530p-La40b530p-La46b530p-La32b530p-La26b450c4-La32b450c4mxxs-Ch.pdf
I am slowly going crazy over a problem, please help me out, if you can.
Long story short: I got a LE40B530 that had a mainboard issue. Power supply checked out fine, so I decided to buy a replacement main.
I bought a mainboard from a local guy, but he told me that this board may not function properly. He is no expert, he removed it from his broken screen set, sold it to someone, who sent him back because it "froze". His tv was also a LE40B530. Only difference is that his mainboard is BN94-02710T, my original was BN94-02710M. For me they look identical, and googling what the difference is between the "T" and "M" did not gave me any results.
Anyway, I gave it a try. My set turns on, works perfectly fine, until a few minutes pass by, then it doesn't react to the remote controller.
It receives the signal, the standby led blinks but nothing happens.
I followed the path of the signal, it goes into a chip named IC3003 (WT61P8) and I believe that the problem is related to this IC. When the tv is on for about 5 minutes, this IC gets warm (it doesn't get hot no matter how long the set is on) and the set no longer responds to the remote. BUT if I cool down this IC, it works again! More strange things are coming: in this state, the power button still works, but not as intended. If I push it, the standby led blinks, that it received the code, then I wait about 2 seconds, and it turns off. But not as it should, because on a normal shutdown it plays a melody. In this case it just turns off. I attached photos of the main and the suspected IC.
In addition, the set looks to operate fine from the buttons on the side. The buttons are wired to the same IC, but on different pins.
Any idea, what should I measure? Where should I look for the problem?
I've tried so far:
-change the eprom between the 2 boards
-change this IC between the boards (it got worse)
382533328-Samsung-La32b530p-La37b530p-La40b530p-La46b530p-La32b530p-La26b450c4-La32b450c4mxxs-Ch.pdf
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