Question about HP Pavilion F1703 17" LCD Monitor
Have disassembled screen, found blown fuse (ceramic time delay fuse) not just blown, but blew ceramic apart, too! Have replaced fuse, only to power back up and hear little 'puff' - blown immediately again (didn't even get chance to press the power switch). Obviously this is a dead short somewhere, but need some kind of guidance so as to test circuit - if anyone can help.
Thanks in advance
Sure, you can testing it both ways... in-circuit or out.
Posted on Dec 01, 2008
Are you sure you replaced with the right voltage or installed backward... What you need is a good meter...I recommended you get the Blue ESR/Low Ohms Meter by Ana Tek Corp.
Posted on Nov 29, 2008
1. Visual inspection of the board, wires, etc. for short (expect you have already done this)
2. Start at the source. Need a meter to test voltage coming into the system (is it really 110VAC?)
3. Then the obvious, which is not so obvious or you would have fixed it by now. Need a meter to test components. Test switch. Maybe the power swtich is shorted!? Test all other components one at a time. Including all the wires. Do any of them feel stiff or look like the insulation might have melted a bit? Might need to remove wires to isolate components to test.
4. Since the power switch is not part of the problem then it is before the switch. When it was working, did anything run while the power was off? yellow LED? fan? Components like power diodes, bridges and rectifiers are typically blown by now also.
5. A filter capacitor, usually large, when shorted internally, can be the problem. Only test for short. Must remove one lead, watch polarity.
6. You can only blow so many fuses before the real problem, which the fuse is protecting, will appear...usually a disasterous end. I blew up a power supply to a washing machine after the third fuse. It fried the whole board with a very loud pop, bright flash and fragments of shrapnel flying everywhere. Please be careful!
1. When you can't find the problem you are looking in the wrong place. Look somewhere else. Suspect everything, even the smallest detail is often the real problem. Like, what have you ruled out? Did you already assume the switch was good, the wire from the wall was good, the outlet was good, the power was good?
2. When you don't know what else to do, do something. Deliberately break something to see what will happen. (This is not a rule that I would use in this case but might serve you well in troubleshooting other problems in the future.)
Posted on Nov 29, 2008
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