Quadra 700 issue

[marmotta]

Sorry fo my poor english...

I have buy used Quadra 700, first times I powered up it not immediately switch on but... after some minutes! And with power button I not able to power off, if i push the switch the mac only reset... And now after some test and cleaning of the pcb it never switch on. I able to switch on only with a bridge pin 9 and 10 of psu or if I plug the psu in the motherboard with power cable plugged.

But I have another problem... this is a screenshot of my screen (without hdd), recap solve all my problems? What caps i need to change?

 

[olePigeon]

A recap is pretty much need for the Quadra 700.  Surprisingly, there isn't a Quadra 700 tutorial on the Wiki.

I'm sure Uniserver knows which caps need replacing.

 

[marmotta]

Uniserver help me! 

Quadra 700 have only 3 types of caps, and all small and yellow

I order a set of tantalum 16v 10uF and 16V 22uF? ... other capacitor is too small to read capacity.

 

[360alaska]

Quadra 700 has all solid state caps on the LB and should not need recap. in the case of this guy I would tell you to make sure your pram battery has not exploded and if that's ok look into recapping the power supply...

 

[marmotta]

Quadra 700 has all solid state caps on the LB and should not need recap. in the case of this guy I would tell you to make sure your pram battery has not exploded and if that's ok look into recapping the power supply...

Sure? I know tantalum capacitors not have a unlimited life... Battery is new and the old not have lose acid, the psu seems to work good, voltages are stable and in tolerance

 

[TheWhiteFalcon]

Check the VRAM.

 

[marmotta]

Check the VRAM.

Could be, but: how can I do? The problem is the same with and without vram simm's, if exists a issue is on the vram onboard

 

[Byrd]

Check the VRAM.

Or try a nubus video card.

 

[marmotta]

Or try a nubus video card.

Unfortunately I do not have

 

[360alaska]

Do you have vram modules installed? Take them out if you do since the logic board has vram onboard...

 

[TheWhiteFalcon]

To my knowledge no Q700 has needed a recap, so you can understand why we doubt that's the case.

Try a different monitor and cable.

 

[marmotta]

To my knowledge no Q700 has needed a recap, so you can understand why we doubt that's the case.

Try a different monitor and cable.

I use a Apple Multiple Scan 720, with powermac work perfect

@360alaska

I already tried with and without vram simm, no difference.

 

[TheWhiteFalcon]

Just because it works with a Power Mac doesn't mean it'll work with your Quadra.

 

[marmotta]

Just because it works with a Power Mac doesn't mean it'll work with your Quadra.

:O  It 'really possible?

........If I try a lcd with db15>vga converter?

 

[uniserver]

there could be a dead tantalum. 

can you take some good quality pictures of your main board and maybe we can have a look and maybe spot something wrong?

 

[sstaylor]

I have run a Q700 with an LCD monitor and an adapter, so it's definitely possible to do.  Whether you have a good adapter or not would be the question...

 

[marmotta]

there could be a dead tantalum. 

can you take some good quality pictures of your main board and maybe we can have a look and maybe spot something wrong?

Yes, is probably. I have tried with the tester (in continuity):

The two caps near psu socket and the caps load energy from tester.

The small five caps near power swich, three is good, one measure "0", and another one measure a fixed value (all other have a variable value... load energy).

Two caps is damaged?

This is a picture of the motherboard before cleaning

 

[unity]

Try the VRAM in pairs. Just a guess, but I think they can go in two at a time since there are six slots. So just try two, then remove those and try another two.

edit: Yes, they can go in pairs. I just checked mine. In mine, the pair is in the two slots to the left as you look at the picture you posted. So the slots furthest back.

 

[marmotta]

Try the VRAM in pairs. Just a guess, but I think they can go in two at a time since there are six slots. So just try two, then remove those and try another two.

edit: Yes, they can go in pairs. I just checked mine. In mine, the pair is in the two slots to the left as you look at the picture you posted. So the slots furthest back.

Thanks, but I have a vram on-board (512kb) and without vram simm's the problem is the same.