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--- projects:repair:his_radeon_9600_dual_dvi [2009/01/21 17:06] – admin
+++ projects:repair:his_radeon_9600_dual_dvi [2009/01/21 17:10] (current) – admin
@@ Line 35: / Line 35: @@
 ===== Solution =====
-The 3.3V power supply to the DVI transmitter suffered from subtantial noise, coming from the motherboard. The 47uF capacitor C1421, was unable to block this noise. A solution I found was just increasing the capacity. After trying out several type of capacitors, with different capacities, it seemed that 470uF would solve it. It's critical that this should be a low-esr type. Smaller values and other kind of capacitors may not filter the power supply enough.
+To solve the problem with glitches, replace 47uF capacitor C1421 with a larger capacity. I tried several type of capacitors and it seemed that 470uF would be sufficient. The voltage across the capacitor is only 3.3V, so most capacitors will be fine. It's critical that this should be a low-esr type. Smaller values and other kind of capacitors may not filter the power supply enough. You may even improve filtering slightly, by adding a small smd ceramic capacitor (at the bottom) of about 100nF. The easiest replacement capacitor I could find and which would fit as well, was a 1000uF 6.3V capacitor from an older motherboard. The noise I measured was now less then 10mV.
-The easiest replacement capacitor I could find and would fit as well, was a 1000uF 6.3V capacitor from an older motherboard. After the replacement all troubles with glitches were solved. Both in Linux as in Windows. The noise I measured was now less then 10mV.
-The voltage across the capacitor is only 3.3V, so most capacitors will be fine. You may even improve it slightly, by adding a small smd ceramic capacitor (at the bottom) of about 100nF.

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