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Flat Screen Computer Monitor Repair Question

Discussion in 'Troubleshooting and Repair' started by Duane Pfeiffer, Feb 18, 2015.

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  1. Duane Pfeiffer

    Duane Pfeiffer

    1
    0
    Feb 18, 2015
    I was given a power supply board for a computer monitor to repair. I hooked up flourescent light strip to it and tied the on/off pin to + 5.25 volts from the board itself. I wanted to see if the light would illuminate. It did but only for a couple of seconds, then it turns off. The +5.25V supply goes to 5.37 while illuminated then back down to 5.25 after lamp goes off. I have tested the transformers with blue ring tester and the test ok. I also put an ESR meter on all the electrolytic caps and they appear to be ok. Any ideas?

    Thanks
     
  2. ramussons

    ramussons

    356
    66
    Jun 10, 2014
    Any idea of what was the current drawn by the flourescent light strip? Maybe the power supply was overloaded. Why not try loading it progressively till it trips?
     
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