PCB failures (Such as Seagate PCB 100729420) affect thousands of hard drives every year and often result in permanent data loss. A hard drive may suddenly fail to power on, and a computer may not detect that it is plugged in. Some failed hard drives will also show up in computer BIOS with incorrect brand/model information. PCB failures can also cause physical issues such as read/write head failures, and many PCB failure symptoms overlap with the symptoms of other physical hard drive issues.

Some emails from customers of Seagate PCB 100729420 failures are listed below, along with tips for replacing & repairing.

Seagate PCB 100729420 Failures:

Q: ST500LM021 and ST500LT012 PCB incompatibility

Two drive use the same PCB that is 100729420 rev B.The motor chip of ST500LM021’s fried. That disk’s 7200 RPMDonor PCB ST500LT012 uses same Main Controller but the motor chip. That disk’s 5400 RPMswapping was unsuccessful in two attempts.Quote:Boot 0x10MSpinUpTime = 00000842TTR1 = 00000917LED:000000BD FAddr:00007C1DLED:000000BD FAddr:00007C1Dis this because of speed differentiation? motor chip LM021 is HPAJG V5.motor chip LT012 is HPAAH V5.

Replacement Seagate PCB 100729420:

To repair a failure board, the simple way is swapping the failure board with a replacement board. Donor boards on HardDriveParts.com are listed below:

• Seagate HDD PCB 100729420
• Seagate ST250LT012 PCB Board 100729420
• Seagate ST250VT000 PCB Board 100729420
• Seagate ST320LM010 PCB Board 100729420
• Seagate ST320LT012 PCB Board 100729420
• Seagate ST320LT025 PCB Board 100729420
• Seagate ST500LM021 PCB Board 100729420
• Seagate ST500LT012 PCB Board 100729420
• Seagate ST500LT015 PCB Board 100729420
• Seagate ST500LT025 PCB Board 100729420
• Seagate ST500VT000 PCB Board 100729420