I Have a problem with this tv, it happens that when I turn on the picture is normal but after 10 sec it turns black but sound or other functions work fine.
I checked all caps with an esr tester and a cap tester so no cap damage was found.
The voltage at the two main filter are:
tv on 380 volts tv off 290 volts.
Checked for any other component damaged ,resistors,diodes,mosfet and at first sight found none.
As you can see in the picture where the connector is I took the voltages when the tv is on is as follow:
1 3.17 v 16 5.22 v
2 2.59 v 17,18 0 v
3 5.2 v 19 13 v
4 , 5, 6 0 v 20 0 v
7,8 13 v 21,22 13 v
9,10,11,12 0 v 23 4.46v13,14,15 5.22v 24 0 v
25 3.34
26,27,28,29, 30 0v
I have some doubt about the reading at pin 23 inverter on/off, is this voltage correct? Besides at pin 25 what signal is E-pwm? and finally at pin 27 I have all the time 0v.
I will appreciatte your comments about this problem or could be the lamps or one of them?
rgds
mloo55
I checked all caps with an esr tester and a cap tester so no cap damage was found.
The voltage at the two main filter are:
tv on 380 volts tv off 290 volts.
Checked for any other component damaged ,resistors,diodes,mosfet and at first sight found none.
As you can see in the picture where the connector is I took the voltages when the tv is on is as follow:
1 3.17 v 16 5.22 v
2 2.59 v 17,18 0 v
3 5.2 v 19 13 v
4 , 5, 6 0 v 20 0 v
7,8 13 v 21,22 13 v
9,10,11,12 0 v 23 4.46v13,14,15 5.22v 24 0 v
25 3.34
26,27,28,29, 30 0v
I have some doubt about the reading at pin 23 inverter on/off, is this voltage correct? Besides at pin 25 what signal is E-pwm? and finally at pin 27 I have all the time 0v.
I will appreciatte your comments about this problem or could be the lamps or one of them?
rgds
mloo55
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