Panasonic PT-LW330 / PT-LW280 / PT-LB360 / PT-LB330 / PT-LB300 / PT-LB280 (serv.man5) Service Manual ▷ View online
-61-
Block Diagrams
5
2
7
5
2
7
5
2
7
FANC_SW
H6
3
3
3
FANC_ERR
FAN ERR
AA10
Lamp_cold
FN3005
1
2
2
D3014
W13
FANC_DA
Power_out
FN3004
1
2
2
IC3280
FR9888
D3008
7
0
0
3
D
3
8
2
3
Q
D3011
IC3250
FR9888
H5
Lamp_out
FAN_SW
FN3003
1
2
2
FN3002
1
2
2
T12
FANB_DA
D3006
IC
100
1
PW868/P
W
87
8
8
Y12
FANA_DA
Panel_B/G
Q3361
Q3030
D3005
IC3009
FR9888
Panel_R
S16V
FAN_A
FN3001
1
2
2
FAN_C
FAN_B
R/C
C1
2
1
2
1
E4
LAMP COVER SW
1
2
3_3SDA
E1
LAMP_EN
10
IC1002
TEMP
SENSOR 2
SENSOR 2
TEMP
SENSOR 3
SENSOR 3
TEMP SENSOR 3
<AT30TS75>
IC1002
<AT30TS75>
IC3001
<AT30TS75>
3_3SCL
P3006
3
2
2
8
P3002
IC3100
GL810S
5
BALLAST
LAMP cooling Fans
Exhausting FANS
LCD PANEL
COOL ING FANS
COOL ING FANS
FAN_ERR
Power ERR: ON
P3001
4
`
Fan control
-62-
Troubleshooting
-62-
No power
This projector provides a function which can be specified a defective area simply by indicating the LEDs/ Connect
the AC cord and press
button once and then check the LED indication.
- When the WARNING (red) and POWER (red) indicators are flashing, the symptom indicates that the projector
detected an abnormal temperature risen inside the projector. Check the air filters and remove the object near
the intake and exhaust fan openings, and wait until the POWER indicator stops flashing, and then try to turn
on the projector.
The internal temperature is monitored by sensor IC1002/IC1003 on the MAIN board and IC1902 of the
temperature control board.
- When the WARNING indicator lights red, the symptom indicates that the projector detected an abnormality
in the cooling fan operation or in the power supply secondary circuits. Check fan operation and power supply
lines, and the driving signal status.
When the abnormality occurs inside the projector, the P_FAIL signal (Error: L), FAN_ERR signal (Error: L),
signal (Error:L) are sent to IC1001. And IC1001 sends the shutdown signal LAMP_DC_ON to the power supply
circuit and the secondary power supply will be cut off and signal, viaIC3100 and P3002<lamp cover switch>,
LAMP_ENto the lamp POWER board to cut off the power supply.
An abnormality occurs on the secondary power supply;
Check the S16V check signal. P_FAIL signal becomes low when the abnormality occurs.
An abnormality occurs on the fan control circuit;
If fans FN3001, FN3002, FN3003, FN3004 or FN3005 has an error, the FAN_ERR and P_FAIL signal
become "L".
If the FAN_ERR signal becomes "L", the FAN_ERR signal will cut off the LAMP_EN signal provided for
the lamp power circuit.
Lamp cover switch
Make sure that the lamp cover is mounted correctly. If not or
the lamp cover removed, the lamp does not light on for the
safety. Check the lamp cover and lamp cover switch (KW10).
Lamp cover switch
(KW10)
Troubleshooting
- When all of LED indicators are off, the symptom indicates that the primary power supply circuit does not
operate properly. Check the power primary circuit and parts as follows;
1. AC cord, F2001A/B (Fuse), filter board, POWER board, thermal switch.
2. The thermal switch opens when the surrounding temperature exceeds 120°C.
-63-
Troubleshooting
-63-
Starting Abnormality
Input
100-240V, the
standby indicator
is off
Check the main board's
16V power Input
Yes
Yes
Yes
No
No
No
No
Check 3_3V_MCU and
if ON_MCU (7th pin of
IC1801) is high level
Power error
Check if the fuse is melt
If there is any component
damaged on the power board
1.1. 3_3V_MCU is low, check
IC1007 is working properly 2. If
the seventh pin of IC1801 is low,
IC1801 is abnormal.
2.1. Reburn Sub CPU and Flash
program
2.2. IC1801 is abnormal
1.1. Check if IC1102/
IC1009 and IC1008 are
working properly
2.1. Reburn Sub CPU and
Flash program
2.2. Replace IC1004
1. Check if IRIS is abnormal when the projector is started.
2. Check if FAN_A, FAN_B and FAN_C are low level when the projector is
started. If yes, the projector is normal.
1. Check if P3001 is well connected
2. Check LAMP SW (P3002) is well connected
3. IC3100's 8th and 10th pins are high level and 5th pin is low level.
1. Check if TEMP. A (P3006) is well connected
2. Check if IC1002 and IC1003 and their surrounding loops are normal
The projector
cannot be turned
on and the orange
indicator is on.
The green indicator
is on when the
projector is turned
on and the lamp
is off.
The orange
indicator is flashing
when the projector
is turned on.
Yes
No
Yes
Yes
Follow the procedures below.
-64-
Troubleshooting
No picture
Follow the procedures below.
No picture with all Input
sources
Check signal adjustment loop and LCD driving loop;
Check power supply circuit S16V and peripheral circuit.
Check IC1001, IC8001 and peripheral circuit.
No picture with PC2
Input source only
Check if the HV Sync signal of IC4009's 8th/11th pin is normal;
Check if the IC1001's peripheral circuit, R1191/R1194 have H/V
Sync.
Check PC/AV source selecting loop and processing loop;
Check IC4009 and peripheral circuit.
No picture with all
computer Input sources
Yes
Yes
No
No
No
No
Check AV source selecting loop and decoding loop;
S-Video source
Check S-video sign (Y/C).
Check if IC1001's peripheral capacitor C1803 has signal.
Compound video source
Check the composite video source (video).
Check if IC1001's peripheral capacitor C1805 has signal.
No picture with video
Input sources
Yes
Check IC1001, IC4009 and peripheral circuit.
Check if the HV Sync signal of IC4009's 6th/3rd pin is normal;
Check if the IC1001's peripheral circuit, R1051/R1193 have H/V
Sync.
No picture with PC1
Input source only
Yes
Check IC1001<Scaler> and peripheral circuit.
No picture with HDMI
Input sources
Yes
Yes
No
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