V7 with new Cd\Dvd Drive wont boot anything

[THE M@TRIX]

I have a V7 machine that had a noisy disc drive, A friend bought a new V7 machine and tried chipping it and ended up with a Black screen. So i removed the disc drive from his machine and swapped it with mine. the next day his machine was Swapped by sony.
I did not test my machine till the next Day and when i did i found the machine will not beet anything at all.
I have tried adjusting both Laser pots up and down in 20 Ohm increasments/decreasments. and this failed to make any difference. i have also adjusted the lezerinth screw to no avail.

Anyone got any ideas how to overcome this problem?

Thanks

[s0hel]

how did you adjust the lazer pot? and how do you measure the ohms increase/decrease..

[THE M@TRIX]

I use a 2MM craft's Screwdriver and always have done when adjusting the pots.

I Use A Draper Multimeter to Measure the Resistance on the 2K Setting.

I have found that with V7 lasers you usually need to increase the voltage and not decrease, however i have gone down to 600 Ohms and gone up to 2.000 Ohms and it does not work at all.

Even though it was working in the other machine.

[charlie_ps2]

This suggests a mis-install of the disk drive or the cables.

[THE M@TRIX]

yes well the drive has been removed several times to adjust the pot and all 4 ribon cables are fitted ok, not unless one is damaged, but i find this unlikely as they have not been yanked or anything.

[charlie_ps2]

There has to be an explanation for this and the difference is the re-installation. I'd put money on the problem being somewhere in this area.

[THE M@TRIX]

what would you look at for the problem?

I know that all the cables are connected ok.

The only Explanation would be a defective cable, But how can i test the 3 Cables that are permanently attatched to the Drive?

I will run a continuity test on the Main Ribbon cable on the bottom to see if this is ok.

[charlie_ps2]

Well the cables go into the motherboard; they get caught, nicked. Anything.