HP f1903 problem.

[NxB]

This monitor keeps eating C5907s on one side of the inverter. I've replaced the caps on the inverter and resoldered the plugs. There was a bulged cap on the video board but another tech lost it. I replaced it with 1000uf at 25v but I think its too big. Anyone know what the cap should be on the video board or why else one side of ICs would burn.

[PlainBill]

Re: HP f1903 problem.

This monitor keeps eating C5907s on one side of the inverter. I've replaced the caps on the inverter and resoldered the plugs. There was a bulged cap on the video board but another tech lost it. I replaced it with 1000uf at 25v but I think its too big. Anyone know what the cap should be on the video board or why else one side of ICs would burn.

The most likely cause would be a short. It could be as elusive as a shorted turn on the transformer, or a shorted (or open) cap or transistor.

PlainBill

[NxB]

Re: HP f1903 problem.

I dug through it more, it seems like a short. I think it not worth messing with anymore. I think the transformer is shorted on that side.

[EGuevarae]

Re: HP f1903 problem.

I dug through it more, it seems like a short. I think it not worth messing with anymore. I think the transformer is shorted on that side.

Exchange the transformers with each other just to make sure.

[PlainBill]

Re: HP f1903 problem.

Exchange the transformers with each other just to make sure.

And if it IS a bad transformer, check to see if someone here has one available.

PlainBill

[NxB]

Re: HP f1903 problem.

I don't want to lose more C5907s. One of them was arcing. I got this thing on a couple of times and I thought I fixed it. I put it in the case and it stopped turning on. I think when you put the screen in the metal housing it shorts or moves something. Either way I've done WAAAY too much work for $50.

[EGuevarae]

Re: HP f1903 problem.

Either way I've done WAAAY too much work for $50.

That changes the approach. Save it for parts, for future use of the lamps, screen or something else.