LG 32LG30D (CHASSIS:LB81A) Service Manual ▷ View online
- 17 -
5. RGB PC doesn’t display
Check J703 ,
Can you see the normal waveform?
Check the input of RGB Audio switch(IC1001) ,
Can you see the normal waveform?
Check the output of RGB Audio switch(IC1001),
Can you see the normal waveform?
YES
YES
YES
NO
J703
may have problem. Replace this Jack.
NO
After checking the Power of RGB Audio switch, you
should decide to replace RGB Audio switch or not.
NO
After checking the Power of RGB Audio switch you
should decide to replace RGB Audio switch or not.
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
NO
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
This board has big problem because Main IC(IC100)
have some troubles.
After checking thoroughly all path once again, You
should decide to replace Main Board or not.
Check the input of RGB Video switch(IC700) ,
Can you see the normal waveform?
NO
After checking the Power of RGB Video switch, you
should decide to replace RGB Video switch or not.
YES
- 18 -
6. HDMI doesn’t display
Check input connect J900 , J901, J902
Can you see the normal waveform?
Check DDC communication lines(IC900, IC901,
IC903 Pin5,6)
Check the input of HDMI Seitch(IC902)
This signal is TMDS.
Can you see the normal waveform?
YES
YES
NO
J900 , J901, J902
may have problem. Replace this Jack.
Check the output of HDMI Switch(IC902).
Can you see the normal waveform?
YES
YES
NO
After checking the trace of TMDS lines and power of HDMI
Switch, you should decide to replace HDMI Switch or not.
NO
NO
After checking the Power of this chip, you should
decide to replace this or not.
After checking the Power of HDMI Switch you should
decide to replace MST3361 or not.
YES
Check HDCP communication lines(IC902)
NO
After checking the Power of this chip, you should
decide to replace this or not.
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
NO
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
This board has big problem because Main IC(IC100)
have some troubles.
After checking thoroughly all path once again, You
should decide to replace Main Board or not.
- 19 -
BLOCK DIAGRAM
Side Y/C
Rear CVBS
CVBS_Out
IN1
IN3
IN1
IN3
OUT1
Side CVBS
ANT
DVB/PAL Tuner
(TDVS-H702P)
LG Innotek
M-STAR
(MST2379A/LGE7363C)
D-AMP
(YDA138)
0IPRPTI030B
HeadPhone
LVDS(8Bit)
X-TAL 12Mhz
6212AA2004F
TV_CVBS+(1.8Vp-p)
$0.86
Audio_L
Audio_R
SIF+(96dBuV)
IN2
Air : DVB/PAL
•RGB/YPbYr*2
•CVBS*2
•YC*1
•L/R-IN*3
•SIF
•CVBS OUT*1
R OUT
L OUT
0IMMR00141A
HeadPhone
PC(VGA)
RS232C(Debug)
L
C
D
USB(SW Upgrade)
CVBS0P
SIF_IN1P
SCL_D_TU
SDA_D_TU
TU_TS_CLK
TU_TS_SYNC
TU_TS_VAL
TS1_CLK
TS1_SYNC
TS1_VLD
IN[A2]
OUT[A1]
2
3.3V
1.8V
HP_OUT_L[42]
HP_OUT_R[1]
OUT_P_R[8]
OUT_N_R[14]
OUT_P_L[35]
OUT_N_L[29]
IN_L[38]
IN_R[5]
HP_DET[37]
MUTE[6]
AUOUTR0[80]
AUOUTL0[79]
GPIO12[45]
LVDS[177-190,
194-199]
RXE
/RXO
BIN[1]SOGIN[2]GIN[3]RIN[4]
VS_RGB[7]
HS_RGB[8]
SCL/RX[33]
SDA/TX[34]
DM_DET[
PB_IN[11]
SOY[13]
Y_IN[14]
PR_IN[16]
AUL_IN1[70]
AUR_IN1[71]
CVBS1[30]
AUL_IN0[68]
AUR_IN[69]
SV_C0[25]
SV_Y0[26]
GPIO15[48]
6612F00099A
$0.27617
EAG31022001
$0.185
Tx
/Rx
(IC603)
MAX3232CDR
Tx_Out
Rx_In
R232C_TXD
R232C_RXD
EEPROM
AT24C028N
DDC_SDA/UART_Tx
DDC_SCL/
UART_Rx
IR_RX[57]
SAR0[201]
SAR1[202]
SAR2[203]
SAR3[204]
EEPROM(32K)
24C32
0IMMRAL025A
ROMSCK[35]
ROMSD[36]
5V
Flash(8M*2)
SPI_CK[171]
SPI_DI[172]
SPI_DO[173]
SPI_CZ[174]
EAN32213401
3.3V
KEY_CTL[1,2,3]
MP1593DN-LF
0IPMG00063A
$0.46
12V
5V
Power/LIPS
20
”BCM : $20
23
”BCM : $18
20
”BB3 : $12
23
”BB3 : $18
Power
32K -->
512K
TU_TS_DATA[0]
2.5V
TS1_D0
SCL_A_TU
SDA_A_TU
Video SW
(IC500,
STMAV340)
Comp_1
YPbPr
Comp_2
YPbPr
Comp_Y
Comp_Pb
Comp_Pr
3
3
HY5DU561622
(DDR)
2.5_DDR
HY5DU561622
(DDR)
- 20 -
Side AV_3
V,LR
Rear CVBS_1
V, LR
Side S_3
Y
C
MNT_V,LR_Out
IN1
IN3
IN1
IN3
OUT1
Comp_1
YPbPr/LR
Comp_2
YPbPr/LR
Rear AV_2
V, LR
ANT
DVB/PAL Tuner
(TDVS-H702P)
LG Innotek
M-STAR
(MST2379A/LGE7363C)
$4.66
D-AMP
(NTP3000)
0IPRPTI030B
LVDS(8Bit)
CLK_
14.3L6AF
6212AA2004F
CVBS(ATV)
$0.86
$0.0623
Audio_L
Audio_R
SIF
IN2
Comp1
Comp2
Air : 8VSB
Cable : 256/64QAM
•RGB/YPbYr*2
•CVBS*3
•YC*2
•L/R-IN*3
•SIF
•CVBS OUT*1
R OUT
L OUT
HeadPhone
PC EarPhone
PC(VGA)
RS232C(Debug)
PC IN
L
C
D
USB(SW Upgrade)
1.8Vp-p
1.0Vp-p
96dBuV
CVBS0[31]
Buffer
SIF_IN1P
SIF_IN1M
SIF_IN1P
SIFP0[51]
Buffer
[11]
TS0-7[96,97,98,99,100,101,102,103]
SCL[48]
SCL[49]
MSCL
MSDA
SCLM1[59]
SDAM1[60]
TPCLK[46]
TPSOP[44]
TPVALID[43]
nTPERR[41]
TSCLK[95]
TSSYNC[105]
TSVALID[104]
IN[256]
OUT[255]
2
3.3V
1.8V
HP_OUT_L[42]
HP_OUT_R[1]
OUT_P_R[8]
OUT_N_R[14]
OUT_P_L[35]
OUT_N_L[29]
IN_L[38]
IN_R[5]
HP_DET[37]
MUTE[6]
12V
AUOUTR0[80]
AUOUTL0[79]
GPIO12[45]
LVDS[177-190,
194-199]
RXE
/RXO
BIN[1]SOGIN[2]GIN[3]RIN[4]
VS_RGB[7]
HS_RGB[8]
SCL/RX[33]
SDA/TX[34]
DM_DET[
AUR_IN3[76]
AUL_IN3[75]
PB_IN[11]
SOY[13]
Y_IN[14]
PR_IN[16]
AUL_IN1[70]
AUR_IN1[71]
CVBS1[30]
AUL_IN0[68]
AUR_IN[69]
SV_C0[25]
SV_Y0[26]
GPIO15[48]
6630G70016A
$0.23975
6630G70017A
$0.21984
6612F00099A
$0.27617
6612F00099A
$0.27617
EAG31022001
$0.185
6612J10031A
$0.25744
T
x
/Rx
(ICL3232)
0IPRP00009A
0IMX232162A
$0.32
$0.4
ST-5V
Tx_Out
Rx_In
R232C_Tx
R232C_Rx
EEPROM
0IMMR00014A
$0.076
DDC_SDA
DDC_SCL
IR_RX[57]
SAR0[201]
SAR1[202]
SAR2[203]
SAR3[204]
EEPROM(32K)
24C32
0IMMRAL025A
ROMSCK[35]
ROMSD[36]
5V
$0.145
-‡
$0.76
Flash(16M)
SST25VF016B
SPI_CK[171]
SPI_DI[172]
SPI_DO[173]
SPI_CZ[174]
EAN32213401
$0.67
3.3V
KEY_CTL[1,2,3]
MP1593DN-LF
0IPMG00063A
$0.46
12V
5V
Power/LIPS
Power/LIPS
Power
32K -->
512K
SIF
HY5DU561622
(DDR)
HY5DU561622
(DDR)
2.5_DDR
HY5DU561622
(DDR)
HY5DU561622
(DDR)
Click on the first or last page to see other 32LG30D (CHASSIS:LB81A) service manuals if exist.