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No Power
No Power
Check the switching regulator.
STR-Z2156A
Switching regulator
Caution : "HOT" Circuit !
Timing chart
Pin 4
OSC OUT
Pin 2
Pin 10
P
0
Check the timing of system controls.
Power ON Timing
ON
Projection
LPS
Monitor
Suspend
Standby
Green (light)
POWER_LED
Green (blink)
Orange
Red
H
FAN_SW
(FAN Drive)
L
H
PANEL_SW
(15V ON/OFF)
L
H
5V_SW
(5V,12V,3.3V,
L
2.5V,1.8V ON/OFF)
H
LA
LA P_
LAMP_POW
L
AMP
P _P
P
_P
P
OW
W
(Lamp ON/OFF)
(
(L
Lamp ON
N
N/OFF)
L
L
If this Vcc voltage reach-
es to abnormal voltage
(exceeds 22V), IC651
will be shut down.
IC651
PROTECTION
ABNORMAL
TEMP. DET.
7
DELAY
CD
11
OC-RC
OC
CSS
Check !
TIMING CHART OF SYSTEM CONTROL STATUS
Power OFF Timing
Turn ON
Picture
Turn OFF
15 sec
Check the signal at pin
5 of T651. (Switching
power IC output signal.)
Vcc
DRI Vcc
VB
8
9
15
ABNORMAL
START
VOL. DET.
LATCH
REF
LOGIC
OSC
OSC
CONTROL
6
5
4
3
CONT
CT
GND
VOLTAGE CONTROL
OVER CURRENT DETECT
ABNORMAL VOLTAGE DETECT
Power Management ON (Ready)
No signal
LPS
t
4 min.
30 sec
t
t
t
t
t
t
- 83 -
Troubleshooting
If this voltage reaches to
abnormal voltage
(exceeds 6.8V), IC651
will be shut down.
G (H)
T651
2
Vin
1
FET
OUT
14
FET
12
COM
10
G (L)
PC661
4
1
3
2
PC662
4
1
3
2
PC663
4
4
1
1
3
2
Count down
LPS
Suspend
5 min.
4 min.
D681
16V
D651
-6V
6V
D652
33V
IC681
REF
1
A
2
3
K
Turn ON
t
t
t
t
t
t
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