This issue is most often due to failure of the 33 ohm or 82 ohm resistor arrays (NR601-NR606) on the drive board. If these components fail, the drive may give the system error 11/12, or may allow the system to boot but always give a disc read error.
Hi all! I am looking to buy any and all faulty Philips VAD6011/21 drives (not VAD6035/21). Please send me a message if you are in the US and have any lying around! If the price is reasonable, I will buy as many as you have