Re: Dell E172fpb

Weill I tested the four transistors as you suggested and my results are attached. I also did the ohm test on the lowest setting and I didn't get a reading on any of them in any position. I assume polarity doesn't matter with an ohm test, right? Nothing seemed out of ordinary, so I tried to just resolder the four transformers as everyone suggested. I decided to try it again in the monitor and it worked!!! We'll see how long it works for, but I have a feeling the issue may be (gulp) resolved. So I wanted to thank all the geniuses on this forum for their help!...

Re: Dell E172fpb



What I meant to say is I did the diode test, not resistance....

Re: Dell E172fpb

Thanks retiredcaps, I did that and now I'm waiting for a new set of transistirs. Now, I tested all four of the 2SC5707 transistors in-circuit with my DMM, and a pair of them gave me different reading than the other pair; I measured resistence between pins 1+2 and pins 2+3 one pair of transistors was ~560 for both tests, and the other pair was ~560 for pins 1+2, but pins2+3 were ~240 or something like that. So are those two bad? Or maybe the first two are bad?

Re: Dell E172fpb

I've already replaced the fuse at PF751, the 4 2SC5707 Transistors, and the 2 FU9024 Transistors, which fixed the problem, but it failed again soon after. I did NOT resolder the transformers. After reading this entire thread, I looked at all 4 transformer connections, and the side of the T752 transformer with the 6 pins looks really bad (see the pic). I'm SURE that's the problem that keeps burning out my transistors, wouldn't you say? Now, should I assume the transformer's bad, or should I just resolder it?...