No Raster Generated - NEC DPro2070SB Service Manual

3.1 No Raster Generated

Check the LED (Power-On Indicator).
When the LED blinks in ORANGE→Check for "3.4.9 Self-Diagnostic Functions".
The LED is lit in
No LED is lighting.
The LED is lit in GREEN.
Check high-voltage operation.
NG
OK
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ORANGE
OK
Check the Pin 39 of IC102 in 5V line.
NG
OK
Expected failure point
IC102 or IC100, or peripheral circuits
This judgement should be based on the sound generated when the power
switch is turned on or in terms of electrostatic charges.
Check the AFC line.
NG
OK
Expected failure point
The high-voltage circuits (See Item 3.4.4)
Check the HS and VS lines.
NG
1) CN103 or CN212 on VIDEO PWB, or FFC cable
2) IC216 on the VIDEO PWB, (HS)/(VS) line, or
peripheral circuits
3) Signal cable
Expected failure point
IC102 or IC105 on the MAIN PWB,
Check the 5.15V line (C971+ electrode on the POWER PWB).
NG
OK
Expected failure point
CN9A1 on the MAIN PWB, cable or peripheral circuits
Check Pin 10 of CN601 on the MAIN PWB and Pin 8 of IC701.
Expected failure point
Horizontal oscillation/deflection circuits (See Item 3.4.2)
3-2
Measure the voltage between Pins 6 (HS)
and 5 (VS) of CN103 on the MAIN PWB.
Horizontal period (HS)
Vertical period (VS)
Expected failure point
or peripheral circuits
Expected failure point
The power circuits (See Item 3.4.1
)