Hoping you guys can point me in the right direction here. I'm lost without schematics.
I have a friend's LP2407 LCD in my shop. She complained that it would take up to an hour to eventually turn on. I suspected the power supply so we went through it. All caps tested within spec however we replaced them all anyways (Besides the 150uf-450V).
Previous to the repair, we'd get the blue light on the button eventually however now we get nothing. Initially we could hear the txformer squeal with power applied, however now it's silent.
I've verified all the solder connections, checked the output side for shorts and so far have found no other failed components.
The large 150uf, 450V cap (I don't have the board in front of me to check the C#) measured about 164V
C876 measures 0V
Q811 & Q812 aren't shorted, but I'm suspecting the issue is in that daughter board.
0V on the outputs
Thanks for any pointers!
Dave
I have a friend's LP2407 LCD in my shop. She complained that it would take up to an hour to eventually turn on. I suspected the power supply so we went through it. All caps tested within spec however we replaced them all anyways (Besides the 150uf-450V).
Previous to the repair, we'd get the blue light on the button eventually however now we get nothing. Initially we could hear the txformer squeal with power applied, however now it's silent.
I've verified all the solder connections, checked the output side for shorts and so far have found no other failed components.
The large 150uf, 450V cap (I don't have the board in front of me to check the C#) measured about 164V
C876 measures 0V
Q811 & Q812 aren't shorted, but I'm suspecting the issue is in that daughter board.
0V on the outputs
Thanks for any pointers!
Dave
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