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Image Quality - Low Pass Filter Mod GTX 260 - Need Help - Page 2

post #11 of 13
Quote:
Originally Posted by CL3P20 View Post

damn good eyes, couldnt even make them out from the pic! nerdsmiley.png

I was viewing from my tiny 4" display on my phone tongue.gif
Quote:
Originally Posted by innocenceisdeath View Post

Thanks for the advice smile.gif I will do some continuity testing.

What do you think may be transistors? What I suggested were diodes? If you look at the PCB on the SyndromeOC image (the middle DVI connection), you will see them marked as D523, D524 and D525 http://www.syndrome-oc.net/img/articles/msigtx260lightning/full-size-back.jpg
Don't labels on the PCB marked with a D usually indicate diodes? http://www.electronicrepairguide.com/images/surface%20mount%20resistors.jpg

That is a very good point about how it is creating a resonant circuit. Wikipedia indicates that RLC circuits can still be used to implement low-pass filters, and a low-pass filter makes more sense in this context than a band-pass. https://en.wikipedia.org/wiki/RLC_circuit#Filters

Yes, "D" generally means diode on the PCB print. Probe the SOT23 three leg package and verify that. Should have resistance one direction and no resistance with probes switched. If you can't get one of the legs to show any resistance it might be a jfet, but likely your assumption is correct and it's a diode.

Yes, you can have both C and L components and still be low pass. Need to full map the configuration to know for show how the circuit is setup. They can be used in so many different configurations, making the wrong mod could increase the lower critical frequency and have the adverse effect of you goal. Would be nice if we could get the values of the capacitors and inductors. Will help with finding the right value resistor to replace in the mod.

All in all, I think you're on the right track. I'm curious if the completed mod will yield a visibly noticeable improvement.
    
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post #12 of 13
Thread Starter 
Quote:
Originally Posted by PizzaMan View Post

Would be nice if we could get the values of the capacitors and inductors. Will help with finding the right value resistor to replace in the mod.

All in all, I think you're on the right track. I'm curious if the completed mod will yield a visibly noticeable improvement.

I am working on this. To measure these SMD components though I need some micro tip probes for my multimeter, regular probes are far too large.
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post #13 of 13
Thread Starter 
Quote:
Originally Posted by PizzaMan View Post

Yes, you can have both C and L components and still be low pass. Need to full map the configuration to know for show how the circuit is setup. They can be used in so many different configurations, making the wrong mod could increase the lower critical frequency and have the adverse effect of you goal. Would be nice if we could get the values of the capacitors and inductors. Will help with finding the right value resistor to replace in the mod.

Ok. So I've measured some of the components. I haven't been able to measure the inductors, what is the best way to do this?

AA42olCm.png

I am not sure how accurate the measurement of the 0.3Ω resistors are, the measurement may be a bit fine for the multimeter used.

The yellow circles indicate test points which I believe are before the inductors, resistors and capacitors. Would soldering on new connections here bypass the filtering?
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500W Fractal XL 
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My System
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CPUMotherboardGraphicsRAM
Intel 3570K ASUS P8Z77-V GTX 670 4GB 2 x 4GB G.Skill DDR3 
Hard DriveOSMonitorMonitor
4 x 2TB WD Arch Linux FW900 24" Widescreen CRT IBM T221 
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500W Fractal XL 
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