HELLO AGAIN MY DEAR FRIENDS HERE ARE BACK WITH ANOTHER TUTORIAL MORE ELECTRONIC NUNEZ, presenting here because this TV LG, this is a LED TV model 32nl5100 which, as it has come to our workbench with the typical failure dead team, we will connect it to the mains.
and how you can see we have definitely no sign of life.
and the client says he trailed off suddenly, we suspect mainly from the power source.
because somehow suffered a breakdown, but for sure we will disarm, and then make the appropriate tests.
Ok, let's proceed to disarm him.
ACA as you can see we have already disarmed and here we have what is the source of power and this side of the MAIN board, for the moment we will not suspect the MAIN card, or the T-card, because apparently the fault is in the power source, then we will observe the card very careful mind to verify source if we find any burnt resistance, or other component exploded which gives us an indication, clearer and faster that part or q ue zone may be our fault, then we will check carefully, and get a clearer idea of where to start working.
ok and we have verified and found no component physically broken or burned, then we proceed to connect it to the mains.
and check the output voltage of this source to the MAIN board.
which if the source is working would have to find voltage stand by.
to be present standby voltage means that it is not the source of power, which is causing the fault.
if not, it would be main responsible card .
we will verify each output connector pins, and seek 3.
3v which belongs to the circuit stand by.
and as you have seen we have not found any voltage, which means that our source is not working.
then we will check the voltage on the primary filter input, and we try to find 170V dc.
but as you can see we not find anything voltage, That means that here we have a short circuit, or something is happening whereby the input filter has no voltage.
here we find this filter voltage this filter will find only 1.
2V which is only a residual current, we will verify the power cord, and check if you are arriving AC, V AC ok end of the fuse even find 95v AC input.
and on the other side we are 16v which is not common because the fuse would have to pass the full voltage.
then we will remove the power source and take reading associated components, in this case is the input fuse the first suspect, and then the other associated components, well here we have dismantled the power source, now we will review carefully, if we do not cut any track, or part of the form that is not damaged by short circuit.
we will check carefully here we have these components and physically and at this end we are observed in good condition, here is the input fuse.
and as you see here is short-circuited.
ok because we will check the input fuse not have the right pass, we will connect AC and take reading, let ubicarnosen the multimeter in AC current.
to take you read the power cord.
if you can appreciate to mark 91 v ac.
fuse here after we get 20 v ac, this is a strange reading because we would have to receive the same 95 v AC that are on cable d may be damaged, and power, or 0 v AC because the fuse then we will remove the fuse and check it carefully, and so sure that is what is happening.
ok will do with an analog meter, we will take reading, and check your status here you would have to find continuity, what we have is the doubt because we are dialing current after fuse, ok here you see the fuse is cut, we have to replace it, another of the same value, the fuse is blown by current discharge he has received here, ok the next step will be to replace the fuse !! but first we have to !! check if we have a short fuse later.
or else it will continue to burn, but this will be discussed in the next tutorial.
below in the description of the video will leave you the link to the next tutorial so you can visualize the that we are applying to solve the fault in this tutorial.
ok see you to the next tutorial.