Hesston 700719139 Rev. C Monitor

The Hesston 700719139 Rev. C Monitor is the visual interface module for Case IH round balers (e.g., RS561A), displaying status and diagnostic codes from the main controller board. Common failure points include a dead or flickering LCD due to a burnt‑out backlight LED, loss of communication with the PLC caused by a faulty serial link or damaged connector pins, and power‑supply issues such as a failed 12 V regulator on the monitor board. First‑check diagnostics: verify that the monitor receives correct input voltage (12 V ±10%) and that the ground reference is solid; inspect the LCD backlight LED and its driver IC for visible damage or burn marks; then test the serial data line to the main controller with a logic analyzer or loopback tester, checking for proper baud rate and signal integrity.[oss-gpt-20b]

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