LG TV walks for a while and goes out
If, when raising the R that feeds the vertical IC, the TV remains on. The problem is directed to the vertical stage.
Verify the good condition of all the components (R, C, D, L, etc.) of polarization of the vertical IC.
Change said IC
If the problem persists ... Try temporarily removing Q16 from the circuit. Comment results.
That test is already known friend we are trying to deduce which of the protections is being activated
At what time, was that test done, my dear?
If there is no response in this regard, from the consultant ..
"vertical black stripe on the top ...."
Vertical is from top to bottom, it gives me the impression, which meant horizontal.
If you have a horizontal strip (from left to right) at the top, it means that some component in the vertical stage is still failing. If everything is thoroughly checked, then enter the service menu and reset the vertical amplitude parameters
and I am sure that the problem is caused by a protection here I leave an image of the 3 protections indicating which component deactivates it. [/B] what [b] so that the transistor will now return to its place once I have done this locate what protection is activated this will take it in the following way
1. Disconnect a pin of the R423 resistor that is in the green circle and turn on the TV if that protection is not turned off so that it is activated so weld it again
2. Since the test 1 will not work, it will disconnect a pin of D303 that is in the red circle and will try again if the TV does not turn off if it does not turn off this is the one who activates and turns off the TV if it is negative to turn the diode and we will go to the last test
3. Disconnect a pin from the d401 diode that is in the blue circle and turn on again if it no longer goes out
, if, if you try these 3 tests, it turns off even then with the 3 change Q16 and C415 of the
On the contrary, tell me which of the 3 tests did not turn off the TV
Hello friend, I recommend you; I did the test that the R423 told me on the board but it does not carry the R
2) The second test cn D303 is demolished on one side and there is no fault
3) And I don't find D401 I just find DZ401
CHANGE THE Q16 and C415 and follow the fault
Then change everything that is around the vertical Ic and dl flayba the capacitors and it goes very well but it enters a thin vertical black line in the part arriva
Carefully measure the resistances that control the vertical, a resistance or filter is likely to be devalued that you have not yet changed