Kittyboy wrote on 2025-05-04, 04:59:

Batter image attached

If the voltage between the base and emitter of a bipolar transistor exceeds 1 Volt, then it was broken.
First measure the schematic drawing, the pins are shown exactly on top of the motherboard.

shevalier wrote on 2025-05-04, 04:52:

Kittyboy wrote on 2025-05-04, 04:38:

shevalier wrote on 2025-05-04, 04:27:

Its looking like this
Can you test bipolar transistors without desoldering its?

I'll go take another photo of the area you marked up for clarity, I'm not able to accurately view this. Also, if I test these locations, should I assume it is without the CPU installed and power on?

First, measure this red and green on a fully turned on motherboard.

Which one is this on the image?

myne wrote on 2025-05-04, 05:02:

That goes to several places on the board.

Only the Celeron Mendocino has an active consumption of 2.5 V.
In this processor, the IOs are powered by it.
Coppermine and Tualatin are a pair of synchronization inputs and the corresponding clockgen outputs.
On the CUBX, Asus did not even buffer the 2,5V controller output with a transistor

Kittyboy wrote on 2025-05-04, 05:06:

Which one is this on the image?

On a fully powered board
download/file.php?id=218505&mode=view

shevalier wrote on 2025-05-04, 04:52:

Kittyboy wrote on 2025-05-04, 04:38:

shevalier wrote on 2025-05-04, 04:27:

Its looking like this
Can you test bipolar transistors without desoldering its?

I'll go take another photo of the area you marked up for clarity, I'm not able to accurately view this. Also, if I test these locations, should I assume it is without the CPU installed and power on?

First, measure this red and green on a fully turned on motherboard.

They all read within the range of your image.

All within range (see image)

unfortunately the BOM doesn't have the value of that cap, but it should have markings somewhere on it.

shevalier wrote on 2025-05-04, 05:07:

Only the Celeron Mendocino has an active consumption of 2.5 V. In this processor, the IOs are powered by it. Coppermine and Tual […]
Show full quote

myne wrote on 2025-05-04, 05:02:

That goes to several places on the board.

Only the Celeron Mendocino has an active consumption of 2.5 V.
In this processor, the IOs are powered by it.
Coppermine and Tualatin are a pair of synchronization inputs and the corresponding clockgen outputs.
On the CUBX, Asus did not even buffer the 2,5V controller output with a transistor

I meant this:

Kittyboy wrote on 2025-05-04, 05:27:

All within range (see image)

It seems to me that you measured not the terminal of the capacitor, but its "metal body".
For clarity, the last measurement is the pad of the unsoldered 2.5V capacitor for the clock generator.

myne wrote on 2025-05-04, 05:53:

I meant this:

By the way, yes, there is also some small regulator (A M E 8800LE E T) from 2.5V to 1.5V.
Which is also monitored for some reason.

shevalier wrote on 2025-05-04, 06:14:

myne wrote on 2025-05-04, 05:53:

I meant this:

By the way, yes, there is also some small regulator (A M E 8800LE E T) from 2.5V to 1.5V.
Which is also monitored for some reason.

All previous images you sent have been verified within voltage ranges.

did you try 66mhz?

Kittyboy wrote on 2025-05-04, 06:22:

All previous images you sent have been verified within voltage ranges.

All that's left is to try it.

myne wrote on 2025-05-04, 06:25:

did you try 66mhz?

Lower frequency, lower load, lower current.

myne wrote on 2025-05-04, 06:25:

did you try 66mhz?

How would I do that mhz? Also, I accessed the rear of my computer and was able to verify the capacitor voltage, previously I only measured the case, not the pad. It is 2.5v (see attached image)

Kittyboy wrote on 2025-05-04, 06:40:

It is 2.5v (see attached image)

Well, all powers of the board are good, alas

Kittyboy wrote on 2025-05-04, 06:40:

myne wrote on 2025-05-04, 06:25:

did you try 66mhz?

How would I do that mhz? Also, I accessed the rear of my computer and was able to verify the capacitor voltage, previously I only measured the case, not the pad. It is 2.5v (see attached image)

Motherboard jumpers as usual

Think of it as a hardware safe mode. Slow everything down and see if it comes to life

myne wrote on 2025-05-04, 07:14:

Kittyboy wrote on 2025-05-04, 06:40:

myne wrote on 2025-05-04, 06:25:

did you try 66mhz?

How would I do that mhz? Also, I accessed the rear of my computer and was able to verify the capacitor voltage, previously I only measured the case, not the pad. It is 2.5v (see attached image)

Motherboard jumpers as usual

Think of it as a hardware safe mode. Slow everything down and see if it comes to life

OK, wasn't sure. Yes, I did try that previously, set the jumper for manual and tried a few times.

shevalier wrote on 2025-05-04, 07:03:

Kittyboy wrote on 2025-05-04, 06:40:

It is 2.5v (see attached image)

Well, all powers of the board are good, alas

I really appreciate your help, I know it must be difficult to remotely try and assist. It's just a mystery at this point...

I am assuming you're using the known good ram and cpu from the other board, and each slot, at 66 fsb and memory.

Unless you can find a short cap somewhere around the memory, or chipset, it's time for a post card.

I had previously read the case of the cap rather than the pad, since then, I verified the voltage from accessing the rear case 2.5v.

Yeah, I think you are correct, time for a post card... At least I made an effort. 😀. Much thanks to Vogons members like yourself to help me on my journey.

I will keep the board around as a reference, even an extra BIOS.