Raster - NEC MultiSync 3D JC-1404HME Service Manual

1. NO RASTER
CHECK 170V LINE
85V LINE
24V LINE
MEASURE THE FOLLOWING POINTS ON SW.REG PWB
·170V ..... BETWEEN K1 AND K4
· 85V ..... BETWEEN K2 AND K4
• 24V ..... BETWEEN K3 AND K4
NG SW-REG OUTPUT ERROR
- - - - - - - - ' . ~ SEE ITEM 2
OK
CHECK H.V
OPERATION
CHECK 12V LINE
5V LINE
CHECK
CRT HEATER
NG
NG
JUDGE PECULIAR NOISE OF HIGH VOLTAGE GENERATED
AT POWER SW ON, OR STATIC ELECTRICITY.
CHECK
H.OSC
H.DEF
MAIN DC/DC CONVERTER
MEASURE THE FOLLOWING POINTS ON MAIN PWB
·12V ..... BETWEEN TP550 AND GND
• 5V ..... BETWEEN TP151 AND GND
CHECK
12V REG.
5V REG.
HEATER
.,_ _ _ _ N_G _ _ _
...i.
DOES NOT LIGHT
CONNECTOR X 4
pin
+6V LINE FAILURE
REFER TO ITEM (2-2-1)
OK
HEATER
LIGHTS
t
TURN THE SCREEN CONTROL CLOCK WISE
I
+
CHECK SCREEN VOLTAGE
I
TOO LOW
1----------1-► R959, C933, SG905, CRT SOKET
300~800V FBT FAILURE
-28-
CRT FAILURE
OR ASSOCIATED
CIRCUITRY TO VIDEO