What are the symptoms of bad BA5815FM chip

What are the symptoms of bad BA5815FM chip.
can somebody explain ?
is DRE related to BA5815FM chip ?

The chip goes bad cause the laser is off. I dunno any of the symptoms, but checking the laser might be a start.

Dead chip: tray does not eject, no eject (blue) led
Partially dead chip: bad reading of CD or DVD based disks.

regards, Stephen

Thanks for your reply Stephen and Sir Leonheart.

Is there any way to check Partially dead BA5815FM chip?
My ps2 doesnt read DVD or CD (DRE) but the Laser is good.

Unfortunatelly you can't do that much with the BA. Except one thing, carefully remove it, and resolder a new one, test the reading, and you'll see. There might be several other problems when DRE occurs, unfirtunatelly one can never be sure what the real problem is without examining the console. Does the DRE appear with originals aswell ? Some kind of installation problem, or a bad chip can cause this aswell...

regards, Stephen

I had DMS3 installed and it was working good all the time. suddenly one fine day morning only DRE appears on any cd or DVD original or backup. now i have removed DMS3 but the problem still there.

There might be a problem with the laser aswell... Did you try the machine with another laser unit ?

regards, Stephen

I have tried my laser unit in another machine it works fine.
I am still clue less.