Rayto RT 2100 C: intermittent blue screen, analyzer does not start
What happened
The analyzer intermittently came up with a blue screen and failed to boot; per the case, starting it required five to six restart attempts, after which it worked.
What was checked
- Power supply unit checked — no faults reported.
- Backup battery checked — serviceable.
- The engineers found all supply voltages within specification, which shifted suspicion away from the power section toward the main board.
Cause
With the power section fully in order, the probable cause was corrupted firmware on the main board; drawing on experience with a similar analyzer of another brand, the engineers considered bad sectors in the NAND flash holding the firmware the underlying fault. In this case this was an assumption, not a confirmed diagnosis.
The cause is probable and was not fully confirmed.
What was done
The reported recovery path depends on the board revision: on one revision the firmware is re-flashed over the COM port; on another, the NAND chip is desoldered and written in an external programmer with an image taken from a working unit, after which the unit's own identification data is restored. Since the cause in this case was probable rather than confirmed, verify the firmware fault before opening the flash. Restoring the unit's identification data is a procedure from the manufacturer's service documentation, done by authorised personnel.
Safety
Disconnect the analyzer from the mains before any board-level work and allow stored charge in the power circuits to discharge; before returning the analyzer to use, run an electrical safety test (protective earth continuity and leakage current).
Lesson: When a unit boots only after several restarts, check the power rails first, but if they are healthy, suspect corrupted firmware or degraded flash memory on the main board before swapping parts.
Covered in the course: Lab Analyser Service — Level 2: Fault-Finding →
Written from an anonymised case shared by service engineers. It is not a manufacturer instruction and grants no authorisation. Independent note; names are trademarks of their owners.