LG 21fu6rl-LG CW81B chassis TV Does not turn on problem with source
Televisor LG 21FU6R
Televisor LG 21FU6R
place everything in its place and measure at the exit of the diodes, on the cathode - completely desoldering the flyback pin corresponding to + b-
see and comment if the ST LED turns on
Luis Tartaglia,. I already isolated the terminal from the b +, but the ST LED does not turn on, I think the diodes it refers to are the D813 and D826 that leave the terminals I have 342 millivolts. on the led I have 160 millivolts only.
Thank you very much for your comments, I have reviewed and the problem of the source and apparently for the moment I have identified this integrated that is bad IC810 (W6554A), where I live I have not been able to get it and it will take me a little longer while I travel and bring it As soon as I replace it and verify measurements in other components I will be telling you how it goes, again thanks, I have learned many things.
Thank you for responding with help, you can illustrate a little better how to connect the focus on + b, where I connect each focus terminal please.
Disconnect the R that feeds + B to the flyback leaving the source free of the horizontal load ....
Connect the bulb to the (+) and (-) terminals of the + B source filter .... This must remain so until the source voltage is recovered and stabilized .... The filament bulb must be According to local AC supply: 100w / 220v or 70w / 110v approximately
I did it, but I did not get it to turn on the spotlight, I have no voltage on the C814 filter, I am suspecting that it is at the input of the source since it has two input windings and when measuring voltage in each independent one does not mark voltage, but if I place one end of the tester in one winding and the other in the other if it shows me voltage, it seems that there is only one polarity per primary winding.
pins 1 and 2 have only negative voltage and pins 5 and 7 positive, the optocoupler is ok, proof of some resistors and diodes ok before the primary winding, tomorrow I will continue testing. Thank you.
Remember that in this type of standby source the voltage drops by up to 40%. Arriving at its nominal value (115v) to the ON order. .... If there is no + B, mainly just check voltages on each of the pins of the IC810 and check the good condition of the components around them in the primary stage 'the main suspect would be the IC810 .....
Thank you very much for your comments, the problem is correct at the moment the IC810 (W6554A) identifies it, where I live it is not possible to get it I will have to wait to be able to bring it or ask for it, as soon as I get it and install it on the TV I will inform how it is progressing the repair, thanks again for the comments since I have also learned many things that I did not know, also if it is possible I will borrow a multimeter with capacitor function since I have the doubt of some, and the one I have does not have that function .