Hello,
I have a BN44-00473A from a TV, the voltage output is not fixed, the psu keep turn on and off or is trying to turn on, but due some problem it can't mantain and keep reset. Every three seconds voltage rise about 5V to 12V (on B12V line) but my meter is not fast enought to cath that voltage spike because it drop to 0V almost instantly. I can hear a fast click sound every time when voltage rise, maybe from a relay or switching noise. The psu is able to light up the LCD backlight at that rise moment, like an instant flash. Same happen with 5V Line.
High DC Voltages also variate from 160V to 140V at that moment but never drop to 0V
I have no experience with SMPS boards but i test all caps and they are good, visual inspect with microscope seens good and new, no signs of damage.
I also have the datasheet, if someone can give me some guideness would be cool as i don't have experience troubleshooting this modules but i would like to have.
PS: Main board had a short under CPU which i already replaced and is fixed now. Maybe the SMPS killed the main board with that unstable voltage?
All measurements was made only with SMPS connected to AC without any other conections to modules
Regards
I have a BN44-00473A from a TV, the voltage output is not fixed, the psu keep turn on and off or is trying to turn on, but due some problem it can't mantain and keep reset. Every three seconds voltage rise about 5V to 12V (on B12V line) but my meter is not fast enought to cath that voltage spike because it drop to 0V almost instantly. I can hear a fast click sound every time when voltage rise, maybe from a relay or switching noise. The psu is able to light up the LCD backlight at that rise moment, like an instant flash. Same happen with 5V Line.
High DC Voltages also variate from 160V to 140V at that moment but never drop to 0V
I have no experience with SMPS boards but i test all caps and they are good, visual inspect with microscope seens good and new, no signs of damage.
I also have the datasheet, if someone can give me some guideness would be cool as i don't have experience troubleshooting this modules but i would like to have.
PS: Main board had a short under CPU which i already replaced and is fixed now. Maybe the SMPS killed the main board with that unstable voltage?
All measurements was made only with SMPS connected to AC without any other conections to modules
Regards
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