Oki B6200 - FIP1.19 LCD;LED Display Error

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Chapter 1 Troubleshooting
FIP1.19 LCD/LED Display Error
Step
Check Yes No
Possible causative parts:
OPERATION PANEL (PL1.1.1)
HARNESS ASSY PANEL (PL1.1.10)
HVPS/MCU (PL12.1.19)
LVPS (PL12.1.5)
1
Checking 3.3VDC power line
Is the voltage across the harness of OPERATION PANEL,
3.3 VDC?
Go to step 2. Go to step 4
2
Checking OPERATION PANEL for continuity (1)
Is every cable of HARNESS ASSY PANEL continuous?
Go to step 3.
Replace
HARNESS ASSY
PANEL.
3
Checking OPERATION PANEL (2)
Is the display stable, after replacing OPERATION PANEL?
(RRP1.4)
End of work
Replace
HVPS/MCU.
(RRP12.10)
4
Checking the power to OPERATION PANEL
Is the voltage across P/J28-5 <=> P/J28-4 on HVPS/MCU,
3.3VDC?
Go to step 5.
Replace
HVPS/MCU.
(RRP12.10)
5
Checking FCC ASSY ESS for continuity
Disconnect P/J28 from HVPS/MCU.
Are the following continuous normally?
P/J28-5 <=> P/J280-22
P/J28-4 <=> P/J280-23
Replace
PWBA ESS.
(PL12.1.13)
Replace
FCC ASSY ESS.
(PL12.1.16)