LG 42PG3000-ZA (CHASSIS:PD83A) Service Manual ▷ View online
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5-2. In case of does’t display the screen into specific mode
(1) Symptom
1) The screen does not become the display from specific input mode
(RF, AV, Component, RGB, DVI).
(2) Check following
1) Check the all input mode should become normality display.
(3) In case of becomes unusual display from RF mode
(4) In the case of becomes unusual display from side S-video/AV mode
(5) In the case of becomes unusual display from Component, RGB mode
Is the Tuner normal?
Is the Tuner Cable connected?
Re-insert the Cable.
Yes
No
No
Is the IC100(LGE7383C)
normal?
Replace the Tuner.
No
Is the Input voltage, IIC Communication
and CVBS output normal?
Yes
Is normal the Input voltage, IIC
Communication?
No
Block A
Replace the IC.
No
Is the Video input of the AV
Jack(JK700, 707)normal?
Yes
Check the input source and Cable
No
Same as Block A
Is theR,G,B input and H,V Sync
of the JK701,703 normal?
Check the input source
No
Yes
Same as Block A
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(6) In the case of becomes unusual display from HDMI mode
(7) In the case of becomes unusual display from SCART1 mode
(8) In the case of becomes unusual display from SCART2 mode
Is the Video input of the
HDMI Jack normal?
Is the TDMS(IC902)
normal?
Yes
Yes
Same as Block A
Check the input source
No
No
Is the Video input od A/V
Jack(JK601) normal?
Yes
Same as Block A
Check the input source
No
Is the Video input od A/V
Jack(J600) normal?
Yes
Same as Block A
Check the input source
No
Is the Input and Output signal,IIC
Communication normal?
Replace the IC.
No
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6. In case of no sound
(1) Symptom
1) LED is Green.
2) Screen display but sound is not output.
2) Screen display but sound is not output.
(2) Check following
All input(mode) is no
sound?
Only HDMI is No
Sound?
Yes
Download
the EDID data
Yes
No
YES
Only RF is no sound?
Check
the Tuner IN/OUT
Check
the Sound IN/OUT
Yes
No
Only AV/component/PC
input is no sound?
Yes
No
IC1000 operates
normal?
Replace the IC1000
(NTP3000A)
No
Replace the VSC B/D
YES
Is the speaker On it
menu?
Set on speaker in menu.
No
Is the speaker Cable
normal?
Check the Speaker
Cable.
No
Yes
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BLOCK DIAGRAM
LVDS
LVA_ [0:4]
SC2_L/R_IN
LGE7363C
(IC100)
MM1731
(IC700)
NTP300A
IC902
SP (R)
SP (L)
P1000
CI Slot
(P800)
EEPROM
KIA7427
(IC101)
I2C_A_TU
KEY1/2
TV Tuner
BOOSTER
SIF
AGC_SPEED
DDR Memory
256Mb (IC301)
SC1_R/G/B
DSUB_R/G/B
R/G/B
PC_L/R_IN
COMP_Y/Pb/Pr
COMP_L/R_IN
DSUB_H/V_SYNC
(IC702)
DDC/UART-Tx/Rx
TMDS351PAG
(IC902)
EEPROM
HDMI_CEC
TDMS
TMDS
HPD
HPD_1, 2, 3
CEC_REMOTE
USB_DM/DP
5V_HDMI_1, 2, 3
PCM_ADD
PCM_DATA
TS_Parallel
TU_TS_DATA
KIC7SZ32FU
(IC802)
PCM_CD_ON
CI_CD_1/2
I2S
AC_DET, MUTE, /SW_RESET, CLK
P401
LED_G/R & IR
Flash Memory
4MB (IC303)
SC1_CVBS_IN
SC2_CVBS_IN
SC1_TV_VOUT
DTV/MNT_V_OUT
SC1_L/R_IN
TV_L/R_OUT
DTV/MNT_L/R_OUT
PDP
Panel
RESET
TS_Serial
EEPROM
EEPROM
DDC_SCL, SDA_1,2,3
RS232C_Tx/Rx
RS232C_Tx/Rx
I2C_D_TU
MC74H4066
(IC1001)
PC_COMP_L/R_IN
SPDIF_OUT
DDR Memory
256Mb (IC300)
Flash Memory
4MB (IC304)
SPI_SCK
SPI_SDI
SPI_SD0
SPI_CSN_1
SPI_CSN_2
EEPROM
(IC302)
HDMI_I2C
SCL_EEPR
SDA_EEPR
MDATA[0:16]
MDATA[17:31]
P1100
16V 12V 5V
TV_CVBS
SIDE_Y, C_IN
SIDE_CVBS_IN
SIDE_L,R_IN
RGB_SW
AU_SW
SW_I2C_3.3V
SW_I2C_3.3V
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