Hello.
I have a Fujitsu-siemens C787 CRT monitor 17" that one resistor has gone up in smoke. The monitor still works!!! Acctually the resistor is not shotcircuit nor broken just badly burnt, but I don't feel I can rely on the mesured value from it. I would really like to replace this resistor before something more brakes down because of that resistor. Since it is fried I cannot tell the value from the standard color-code printed on it.
I can think of 3 ways to solve this:
1 - Does anyone know where I can get a hold of a circuit printout for this monitor so I can get the right value for the replacement resistor.
OR
2 - Maybe someone have a possibility to look in their monitor what value it is??? The resistor is placed on a small circuit board with only 2 more 0.5-1w resistors one capacitor and two other simple components of the same sort (wont tell which so people won't just make upp a value for the points) The circuit board is placed behind a small plastic cover on the down side of the picture tube right next to the magnetics wireing. For reference I would also like to have the value of the two other resistors and what the other two simple components are.
OR
3 - You have an alternative solution that gives me the right value of the resistor or some other solution that guaranties that the monitor will continue working.
Thanks in advance.
//Yin
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I try look in monitor for you but then big big noise from somthing i get smoke in my face now I having use other monitor mine is :FRIED" ok. please when you find anser tell then I rebuild my monitor. Now i tell very important to check make sure power is OFF ok i can't enough stress!
hope you win...cya!
jhance-
1) Hope it is not the ONLY source....
2) se comment to Darrel
3) As I wrote in the early part : The resistor is still 'resisting' :-) but don't look very nice. Therefore I would like to replace it.
Darrel -
Thanks for trying. I shurely did not mean for you to blow your own monitor. Is it the same resistor that you are haveing problems with (now...) or can you still read the color code from it. Can I give you any infomation to you so you can repair your monitor?
as Darrel said, one cannot stress enough:
!!! TURN OFF AND DISCONNECT POWER !!!
before opening any electrical (or mecanical) appliancies.
1) It is!
3) But WHY did it do what it has done? Resistors RARELY fail spontaneously. Something ELSE is likely wrong and is pushing more power through this resistor that it can handle. If you simply replace it, chances are high that the same thing will happen again.
In fact, the the most common thing when you over-stress a resistor is that it's R value will go UP. This has the nice side effect of reducing the current and therefore the power being dissipated in it and protecting the resistor (and possibly whatever was feeding it too much power) from further damage. If you just replace the resistor you may end up blowing something else...
I suggest that you get a qualified service technician to work on this unless you are a technician or engineer and can properly diagnose and debug this yourself. From the tone of your question I am concluding that you are not experienced in this type of electronic repair.
As I said earlier, you need to look at this resistor in the context of the circuit it is in and figure out WHERE the excess current is coming from and fix that problem also.
Dirty trick #1:
Detach one end of resistor from PCB.
Measure the resistance with a suitable meter (ohmmeter).
Get a new resistor with the value found, but with a greater power rating, and install this.
As pointed out by jhance, the resistance will probably be altered upwards by cooking, so chances are good that you wo'nt overload anything more than already being the case, if you choose present value of burnt resistor as a guide.
/RID
Oh and take care when working inside the monitor. A pretty big headache will be the least of your worries if you go about it in the wrong way.
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by: jhancePosted on 2003-06-01 at 04:12:25ID: 8623387
1) The only source for this is Sams Photofact but unfortunately they are expensive (for a one-time repair) and not available singly. You have to buy an entire "set" of these and also not all makes/models are included.
2) Well, that's one option. You're going to have to find someone who has one of these and it willing and able to open it up.
3) You might just try it without the resistor. It's amazing how often parts don't really do much..... The fact that it is still working seems to point in that direction.
One approach to this is to trace out the circuit components around and connecting to the burned resistor and try to make an engineering judgement as to what value might have been used here. It may take some understanding of the function of this area of the circuit....