Disk Not Spining

The drive in my dreamcast is yamaha.
There's laser activity, but no disk spining.
i've changed the gd-rom board with another board from a friend and it works.
is there any way to fix my gd-rom board?

 

Did your gd-rom work in you friend's console or did his gd-rom work in your console?

 

his gd-rom board combined with my laser and my motors worked in my console. that's why i know may gdrom board is damaged and my laser and motors are ok.

 

Hmm. Doesn't sound like an easy fix.

Check the motor wires aren't coming loose and try cleaning the socket contacts on your gd-rom board although I can't imagine much dirt getting in there in the first place.

It's most likely that something has burnt out and as it's surface mount components, it can be difficult finding/replacing faulty parts.

I'd go for a cheap dreamcast on ebay to avoid a major headache!

 

This is fried motor control chip issue... I have 3 boards with fried motor control chip (a chip with BAxxxx on it).

 

Do you know if it's a standard ic or a custom one?

If it's available and cheaper than a second-hand console, it might be worth replacing...

 

The BA chip only burns if the motors are bad.
And when such failure happens, sometimes it shorts the 12V line of the power supply, causing the console to just "blink" the power led when you turn it on.

Most times the defect mentioned by the OP happens it's cold solder joints on the GD-ROM drive board.

 

I belive it's the BA5986 chip, but i hopped there is something else burned. And yes, the led blinked a few times, but now it just stays on (no blinking anymore).
l_oliveira, what did you ment by: "Most times the defect mentioned by the OP happens it's cold solder joints on the GD-ROM drive board."?

 

I mean that I have here a bunch of Dreamcast GD-ROM drive boards that failed due to broken solders than because of bad BA5986FM chip....

 

the ba chips are cheap and are not custom

 

i checked and double checked and none of the pins are loose. the drive board is intact. the fuse near the BA chip is also good. can i use a BA chip from a pc cd-rw drive?

 

Can i use BA5972FP instead of BA5986FM? The block diagrams and the pinout are the same. Here are the diferences:
BA5986FM (dreamcast): 2 channel; limit 18V
BA5972FP: 4 channel; limit 13.5v