Panasonic PT-TW370 / PT-TX430 / PT-TX340 Service Manual ▷ View online
INF-19
SECTION 1 SERVICE INFORMATION
<TW370/TX430/TX340>
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 IC4007's 10th/11th pin is normal;
Check if the IC1001's peripheral circuit, R1051/R1193 have H/V Sync.
Check PC/AV source selecting loop and processing loop;
Check IC4007 and peripheral circuit.
No picture with all com-
puter 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, IC4007 and peripheral circuit;
Check if the HV Sync signal of IC4007's 4th/5th 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
4. 4. 2. No picture
INF-20
SECTION 1 SERVICE INFORMATION
<TW370/TX430/TX340>
Follow the procedures below.
Check IC5202 and peripheral circuit.
Check if the power supply of L5007 reaches 12V
Yes
Check related circuits of Q5001/Q5004/Q5009/Q5010/Q5006/IC1001.
Check the voltage of pin
18 and pin34 is more than
3V.
No
1. Check if the loudspeaker cable is plugged or broken.
2. Check if the loudspeaker is damaged.
Check pin 1,2 and 43,44 of
IC5202 have audio signal
output.
No
Yes
4. 4. 3. No audio output
INF-21
SECTION 1 SERVICE INFORMATION
<TW370/TX430/TX340>
4. 5. I/O port functions
PIN NO.
PORT NO.
Signal Name
Description
I/O
U18
PORTA0
EXTINT1
PHY break
O
T16
PORTA2
RST_RJ45
RJ45 network processing port is reset, low level is reset
O
R16
PORTA3
MONIT_OUT
Switch VGA2
Input / output status: 0_ Input, 1_output
O
T17
PORTA4
IRIS_CW
IRIS direction control
O
R17
PORTA5
P_KEY
On/Off button
Input port
I
T18
PORTA6
IRIS_RST
IRIS reset control
O
R18
PORTA7
IRIS_CLK
IRIS clock control
O
B22
PORTB0
OEFID_IN
LVDS
Input
selection
O
F19
PORTB1
KEY_GPIO9
Android module control
O
D20
PORTB3
GPIO9
Android module control
O
A22
PORTB4
MCU_HPD0
HDMI hot plug control
O
M6
INR4
ON_2_5V
PWC878_2.5V voltage enabled, high level effective
O
M1
INR6
CXD_MUTE
Close
Input
O
M5
INR7
OUT_DET_EXT
AUDIO_OUT check
I
K4
INR9
LAMP_ECO
LAMP mode check
I
L2
ING2
TEMP_LED
Warning status LED
O
K3
ING3
POWER_LED_PW
Power indicator control
O
J4
ING4
READY_LED_PW
Ready indicator status
O
L1
ING5
LAMP_EN
Lamplighter enabled
O
K6
ING6
LAMP_S
Lamplighter control status
O
K2
ING7
USB_HUB_EN
USB HUB enabled
O
J5
ING9
MCU_HDMI
HDMI EDID write-in control (H:write. L: protection)
O
J1
INB2
ON_1_8V
PWC878 1.8V voltage enabled, high level effective
O
H4
INB3
ON_1_0V
PWC878 1.0V voltage enabled, high level effective
O
H6
INB4
FANC_SW
Group C fan voltage control, high level, voltage output
O
H3
INB5
ON_3_3V
PWC878 3.3V voltage enabled, high level effective
O
H2
INB6
ON_15V
CXA3828_15V voltage enabled, high level effective
O
H5
INB7
FAN_SW
Fan voltage control, high level, voltage output
O
G2
INB9
ON_16V
5V power enabled, high level enabled
O
M3
INR0
P_OE
PT2830 control (L:MUTE, H:active)
O
L5
INR1
ROM_WP
IC1013 write protection control
O
K5
ING0
MOTOR_POWER
IRIS power supply enabled
O
J3
INB0
ON_5V
USB 5V control, high level effective
O
J2
INB1
ON_1.0V_PW
Control PW878's 1V voltage. H: active
O
U19
PORTI0
GPIOA0_4
External Android board control interface
O
V20
PORTI1
GPIOA0_9
External Android board control interface
O
W21
PORTI3
LAMP_EN_SEL
Point-to-signal control
O
U20
PORTI4
IRIS_DET
IRIS detection
I
W22
PORTI5
AUDIO_POWER
AUDIO power enabling port (H: ACTIVE)
O
V21
PORTI6
GPIOA0_5
Android board control interface
O
D12
PORTJ0
RC_SEL_FRONT
Enable front remote control
O
A13
PORTJ1
RC_SEL_BEHIND
Enable rear remote control
O
D11
PORTJ2
RST_GAM
Initialize CXD3551
O
B12
PORTJ3
TC_XCLR
Initialize CXDA3828
O
C11
PORTJ4
SD_MCU
Amplifier SD enabled (L: MUTE,H:ACTIVE)
O
E11
PORTJ5
VDDMNT
CXA3828 drive voltage switch control
O
F11
PORTJ6
PS
POWER OR VCOMRGB SW
O
A12
PORTJ7
IRIS_STBY
IRIS standby control
O
INF-22
SECTION 1 SERVICE INFORMATION
<TW370/TX430/TX340>
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