Sanyo CE14A2-C - Possible Causes of Entering in Protection Mode; Protection Inhibition

Service manual CHASSIS 2112-Series EC7-A
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7.5 Possible causes of entering in protection mode
Next, some of main problems that can cause that the chassis goes to ERROR_N are:
ERROR_1:
Fault in the supply of +8V from the microprocessor.
Non-continuity of I2C bus between IC100 and IC400.
IC400 damaged.
ERROR_2:
Fault in any supply from ±12V.
Vertical deflection open or short-circuited.
IC701 damaged.
Vertical ramp generator of IC400 damaged.
Fault in path between IC400 and IC701.
C656 open.
ERROR_3:
Short or open circuited heaters.
Short-circuit in some secondary of T650.
Q650 damaged.
Driver stage does not work correctly.
Short-circuit from cathode to ground.
ERROR_4:
Overconsumption in the power supply.
General failure in voltage regulators.
ERROR_6:
IC125 damaged.
ERROR_11:
Generic error of I2C bus.
7.6 Protection inhibition.
In order to facilitate the repair of TV set, it is possible to disable the protections keeping pressed the M (PL103) key.
In that case, although the microprocessor detects a failure, it does not set the source to STAND_BY.