Plug & Play (Ddc2B) Operation Error; Degaussing Functional Operation Error - NEC DPro2070SB Service Manual

3.3.3 Plug & Play (DDC2B) Operation Error
Check the SCL line.
NG
OK

3.3.4 Degaussing Functional Operation Error

Check the connections of CN904 on the POWER PWB.
NG
OK
Check the degaussing control line.
NG
OK
Check the waveform at Pin 4 of IC217 on the VIDEO PWB.
(Approx. 5Vp-p)
Check the voltage at Pin 11 of IC102 on the MAIN PWB.
Approx. 0V
Approx. 5V
DDC1 communication is maintained.
Expected failure point
IC217 or D2C1 on the VIDEO PWB, or signal cable
Make checking with CN904 connected.
Confirm that the potential at Pin 47 of IC102 on the MAIN PWB turns the HIGH
level for about 6 seconds when manual degaussing is carried out with OSM.
Expected failure point
IC102 on the MAIN PWB
Expected failure point
1) Degaussing coil
2) TH902, RL901, D950 or R954 on the POWER
Expected failure point
D2C1 on the VIDEO PWB
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