My neighbour was throwing out a Samsung 42" plasma TV so I said I'll take it. A nice project to work on I thought as I have fixed a few TV's by changing capacitors, nothing really that technical.
I got the TV home, the screen looked ok and so I plugged it in. I smelt smoke so shut it off. Opened it up and noticed some capacitors blown on the power board. I swapped them and then I got clicking with 4 red blinks from the button on the front. I checked the Vs etc points and they all read good. I checked the y-main LJ92-01346A and there was a capacitor and two resistors not working. I replaced those. Tried TV and still nothing.
I then checked the X-main and found a few odd readings so instead of fixing it I purchased a working board off eBay as it wasn't that expensive. Plugged it in and the screen flashed patches and then the resistors on the y-main went bang! They were the ones I replaced. Originals were Brown, Black, Gold and Gold. They were large and a dark grey colour. I bought the same band colours and dimensions but the resistors were blue. Would that be a problem?
After that I thought just buy another Y-main. So I did and it came today and I plugged it in. The screen had a few flashes then I heard a pop. I checked and a capacitor had blown on the y-main. I also noticed a resistor getting very hot very quickly. I've replaced the capacitor but haven't turned it on again. The y-main is connected via two ribbon cables. One from the smaller power board. The readings are good from that board supplying power. Then there is a smaller ribbon cable connected to the logic board LJ92-01432A. Now I'm thinking could this be the faulty board? I can't see any points to check voltages, so how do I check? I could spend more money but then if that doesn't work I'm just throwing money away.
It has been good as I am learning a lot but now I'm stuck. Any help would very much appreciated. Thank you.
I got the TV home, the screen looked ok and so I plugged it in. I smelt smoke so shut it off. Opened it up and noticed some capacitors blown on the power board. I swapped them and then I got clicking with 4 red blinks from the button on the front. I checked the Vs etc points and they all read good. I checked the y-main LJ92-01346A and there was a capacitor and two resistors not working. I replaced those. Tried TV and still nothing.
I then checked the X-main and found a few odd readings so instead of fixing it I purchased a working board off eBay as it wasn't that expensive. Plugged it in and the screen flashed patches and then the resistors on the y-main went bang! They were the ones I replaced. Originals were Brown, Black, Gold and Gold. They were large and a dark grey colour. I bought the same band colours and dimensions but the resistors were blue. Would that be a problem?
After that I thought just buy another Y-main. So I did and it came today and I plugged it in. The screen had a few flashes then I heard a pop. I checked and a capacitor had blown on the y-main. I also noticed a resistor getting very hot very quickly. I've replaced the capacitor but haven't turned it on again. The y-main is connected via two ribbon cables. One from the smaller power board. The readings are good from that board supplying power. Then there is a smaller ribbon cable connected to the logic board LJ92-01432A. Now I'm thinking could this be the faulty board? I can't see any points to check voltages, so how do I check? I could spend more money but then if that doesn't work I'm just throwing money away.
It has been good as I am learning a lot but now I'm stuck. Any help would very much appreciated. Thank you.
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