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PDP-V402

7.1.2 TROUBLESHOOTING

1. MAIN POWER ASSY
Check the power supply voltages.
Measurement Points
VADR (60V) (TP3401) –– ADR. GND (TP3402)
VSUS (170V) (TP3301) –– SUS. GND (TP3302)
VOFS (140V) (TP3601) –– OFS.GND (TP3602)
+B (215V) (TP3101) –– P. GND (TP3102)
VCP (12V) (TP3203) –– CP. GND (TP3204)
+13.5V (TP3205) –– A. GND (TP3206)
VCC (5V) (TP3201) –– D. GND (TP3202)
2. SUB POWER ASSY
Check the power supply voltages.
VCSP (40V) ..... TP1603
+12V – YVSUS/2
SP2
+12V – XVSUS/2
SP2
+12.5V – GND
SP3
+12.5V – GND
SP5
+12.5V – GND
SP6
Note: Take note that the CSP. GND differs from the GND
potential of the unit.
TOP
TP3301
TP3302
(VSUS)
(SUS. GND)
D3305
TP3101
(+B)
TP3102
(P. GND)
154
If normal, LED (D3405) lights.
If normal, LED (D3305) lights. (which displays the timing of VCC and VSUS)
POWER ON: lights in red (VCC ON) = lights in yellow (VSUS ON) at 1–2sec
POWER OFF: lights in yellow = lights in red at 1–2sec = LED OFF
abnormal POWER OFF: lights in yellow = lights in green = LED OFF
If normal, LED (D3205) lights.
CSP. GND ........... TP1604
= Y DRIVE (A) ASSY
= X DRIVE (A) ASSY
= CONTROL ASSY
= ANALOG VIDEO ASSY
= INPUT CONTROL ASSY
TP3201
(VCC+5V)
TP3205
TP3202
(+13.5V)
(D. GND)
D3205
TP3401
(VADR)
TP3204
(CP. GND)
TP3206
(A. GND)
D3405
TP3402
(ADR. GND)
MAIN POWER ASSY
(VSUS OFF earlier than VCC OFF)
(VCC OFF earlier than VSUS OFF)
[Precautions for servicing]
1. As the P.D. circuit starts operating when the rear cover is
removed and the CN5801 connector of the FAN RELAY
ASSY is disconnected, short between TP3802 and TP3803.
2. For normal signals, set the rear selection SW S1201 (INPUT
CONTROL ASSY) to OFF. When G on sync signals are
output by Mac, set the switch to ON to prevent overlapping
of the sync. signal.
FAN P. D.
TP3803
TP3802
TP3602
(OFS. GND)
TP3203
TP3601
(VCP)
(VOFS)
TP1603
(+40V)
SP2
TP1604
(CSP. GND)
SP3
SP5
SP6
SUB POWER ASSY

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