Indigo 2 Impact +5V standby

[Camiel]

My Indigo 2 Impact doesn’t work anymore. Thank you Elf for your information about the Indigo 2 power supply. I am measuring no voltage on pin 5 on the left hand connector (+5V standby) with the motherboard connected. When I disconnect the motherboard I measure 5V.
When I connect another 5V power supply to pin 1 and pin 5 of the motherboard I measure 5V. But the current is about 130 mA, it keeps changing between 120 and 135 mA. I think that’s too high.
Can anyone five me some advice?

 

[Elf]

Edit: With apologies, I no longer wish to have involvement with SGUG or SGI communities in general,
and have also chosen to remove all of my content. Many things have changed since I co-founded, named, and ultimately
then left SGUG. There are many good people around, to whom I apologize for frustrating by removing these things, and
also many petty people that over the years whittled down both the enjoyment as well as sense of obligation I used to
feel to anyone else regarding what was ultimately just a hobby. Unfortunately one of the latter now writes the rules
and so it is time for me to take my things and go.

This message will replace all of my previous forum posts because deleting threads that I started would have removed
other peoples' posts.

 

[Camiel]

This is the nameplate of my power supply. I think '+5 AUX.' is the 5Vsb? If that is true it is 100 mA.

I connected pin 1 and 5 to a light bulb and it does drop down to 0V. Even without seeing light for second. I used a 6V light bulb that draws 73 mA on a 5V power supply.

I found out the power supply used a LM317T without heatsink for regulation of the 5Vsb. Changing the LM317T and some capacitors did not help.

Next I bought another ZYTEC Indigo 2 Power Supply. I bought it in working condition but I don't have another Indigo 2 to test it. The 'new' power supply can't light up the light bulb either...

 

[Elf]

Edit: With apologies, I no longer wish to have involvement with SGUG or SGI communities in general,
and have also chosen to remove all of my content. Many things have changed since I co-founded, named, and ultimately
then left SGUG. There are many good people around, to whom I apologize for frustrating by removing these things, and
also many petty people that over the years whittled down both the enjoyment as well as sense of obligation I used to
feel to anyone else regarding what was ultimately just a hobby. Unfortunately one of the latter now writes the rules
and so it is time for me to take my things and go.

This message will replace all of my previous forum posts because deleting threads that I started would have removed
other peoples' posts.

 

[Camiel]

While tracing the standby power circuitry I found out C40 is connected and getting a bit hot when I connect the motherboard to a 5 Volt power supply. Do you think its save to power on the standby power with this capacitor removed? And can I find out the correct values for this capacitor?

 

[Elf]

Edit: With apologies, I no longer wish to have involvement with SGUG or SGI communities in general,
and have also chosen to remove all of my content. Many things have changed since I co-founded, named, and ultimately
then left SGUG. There are many good people around, to whom I apologize for frustrating by removing these things, and
also many petty people that over the years whittled down both the enjoyment as well as sense of obligation I used to
feel to anyone else regarding what was ultimately just a hobby. Unfortunately one of the latter now writes the rules
and so it is time for me to take my things and go.

This message will replace all of my previous forum posts because deleting threads that I started would have removed
other peoples' posts.

 

[Camiel]

Good news!
I desoldered C40 and tested it. The capacitor tester says 'in circuit or leaky'. But 0,1 uF is to little to measure for it.

The I tried the motherboard without HD or graphics card. It turns on and I heard the startup harp sound! Then I tried my other power supply and it also works!

C40 is indeed directly connected to pin 1 and pin 5. So the best I can do is replace it with a 0.1 uF MLCC ?

I think C40 can be important for more people with a 'dead' Indigo 2.

 

[Elf]

Edit: With apologies, I no longer wish to have involvement with SGUG or SGI communities in general,
and have also chosen to remove all of my content. Many things have changed since I co-founded, named, and ultimately
then left SGUG. There are many good people around, to whom I apologize for frustrating by removing these things, and
also many petty people that over the years whittled down both the enjoyment as well as sense of obligation I used to
feel to anyone else regarding what was ultimately just a hobby. Unfortunately one of the latter now writes the rules
and so it is time for me to take my things and go.

This message will replace all of my previous forum posts because deleting threads that I started would have removed
other peoples' posts.

 

[Camiel]

Thank you for your help! My Indigo2 is working fine with a 0.1 uF MLCC capacitor.

After a couple of ours an other problem appeared. On the audioboard capacitor C57 exploded. C54 exploded a couple of years ago and ripped off a solder pad hence the patch wire. I removed C57 and it is working fine again. The solder pads are okay, I will replace it soon.