So far
Without standby light, therefore there is no 5v voltage
There is no voltage of 12v or any other, both in the output to the main and in which it feeds the LEDs
Fuse check well
The diodes do not mark continuity, apparently they are fine
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LCD TVs - LED
Samsung BN44-00754A TV source failure completely dead
hace 5 años
hace 5 años
Hello how are you, I comment on the problem I have with this power source, the point is that one day the TV simply did not turn on again, nor in standby light, before that it was connected to the outlet even if turned off , but lightning struck and from there it did not come back on, and take out the source, check voltages and none is found for both the main card and the LEDs, everything physically looks in good condition,. I would like to know what parts to check and how? Since I am not a technician but I have some knowledge, I attach the image of the source. thanks.
So far
Without standby light, therefore there is no 5v voltage
There is no voltage of 12v or any other, both in the output to the main and in which it feeds the LEDs
Fuse check well
The diodes do not mark continuity, apparently they are fine
So far
Without standby light, therefore there is no 5v voltage
There is no voltage of 12v or any other, both in the output to the main and in which it feeds the LEDs
Fuse check well
The diodes do not mark continuity, apparently they are fine
2.331
hace 5 años
hace 5 años
check the brown component next to the connector looks like a fuse is not clear
hace 5 años
hace 5 años
Check with a capacimeter the blue square capacitors that are next to the transformer
hace 5 años
Check the value you measured with the marked valid if it is excessively altered you have to change them, you also have to track tracks to see where the alternating voltage starts and if it reaches the two terminals of the rectifier bridge, if it reaches the rectifier you will have to measure if the direct current output voltage already rectified of the pisitive and negative terminal is present
hace 5 años
Look friend, the main thing here is to solve the stanbye voltage because without this voltage the rest of voltages will never appear, usually that voltage is associated with the smallest transformer and associated components (transistors, diodes, capacitors, resistors etc).
hace 5 años
That such companion, well already verify and effectively reach 120v of alternating diode bridge as well as they are already rectified. Now, in the secondary part I found that two schottky diodes mark me continuity, this is normal, because following those lines I have two capacitors that when measured with the multimeter mark me continuity even after several seconds which is when they should already be charged and stop measure continuity, then, will the two schottky diodes or capacitors be? thanks.
hace 5 años
Friend if by measuring with the multimeter the mentioned diode in all directions and as a result it gives you continuity this shortly proceeds to change it and with respect to the capacitors at the beginning if they mark continuity but only for a moment, if the continuity is prolonged indefinitely this in short and you will have to replace them. I also wanted to ask you if these components are around the small transformer that supposedly would have to be that of stanbay.
hace 5 años
OK, I have two things, the two capacitors that mark me continuity are the two that are at the bottom left of the image of the source, above a little to the left is the chopper transformer, those two mark me continuity but today I removed them from the card and they don't do it anymore, does this mean they aren't bad?
Now, the two diodes that I mention, are high frequency chottky diodes, those two are below the card just at the height of the capacitors these at the time of making the measurements mark me continuity in both directions, will they be causing everything? thanks.
hace 5 años
It is better that you replace it since without them the source will not work and a thousand apologies I could not answer you due to force majeure problems.
hace 5 años
If it has characteristics equal or superior to the original, it is only good that you remember which side the negative is going to.
hace 5 años
hace 5 años
Dear colleague, check the apt coupling is the black square, change it that makes the secondary source work, but also short-cut diodes and finally the open tracks
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