DOWNLOAD LG 42PB4D-AA (CHASSIS:PB73B) Service Manual ↓ Size: 9.95 MB | Pages: 59 in PDF or view online for FREE

Model
42PB4D-AA (CHASSIS:PB73B)
Pages
59
Size
9.95 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / Plasma
File
42pb4d-aa-chassis-pb73b.pdf
Date
PREV: LG 42PB4DA-UA (CHASSIS:PA75C) Service Manual

LG 42PB4D-AA (CHASSIS:PB73B) Service Manual ▷ View online

- 21 -
Symptom : TV set out of order on powers
Check X300 (24MHz)
Normal?
Re-download
 MTV416GMF (IC309 )
Normal?
YES
NO
Replace MTV416GMF (IC309 )
and Re-download
Check SI3865(Q702) 2,3pin 5V
Normal?
Replace Power board
Normal
Check P702 all input voltage
Normal ?
YES
Check SI3865(Q1901
,Q1902,Q1903)  2,3pin 3.3V
Normal?
YES
Check SI3865(Q702) 5pin 3.3V
Normal?
Check SI3865((Q1901,Q1902
, Q1903 )  5pin 3.3V
Normal?
NO
NO
NO
Check P702  wafers & connectors.
Normal ?
YES
Check P701 #3,8Pin 5V
Normal ?
YES
Replace power board
NO
NO
Replace SI3865(Q702)
YES
Replace SI3865(Q1901,Q1902,Q1903 )
YES
NO
YES
POWER
1. Video
(11) POWER1
- 22 -
Symptom : No booting
Check X300 (24MHz)
Normal?
Re-download
 MTV416GMF (IC309 )
Normal?
YES
Replace MTV416GMF (IC309 )
and Re-download
Check SI3865(Q702) 2,3pin 5V
Normal?
Check SI3865(Q1901
,Q1902,Q1903)  2,3pin 3.3V
Normal?
YES
Check SI3865(Q702) 5pin 3.3V
Normal?
Check SI3865((Q1901,Q1902
, Q1903 )  5pin 3.3V
Normal?
NO
NO
Replace SI3865(Q702)
YES
Replace SI3865(Q1901,Q1902,Q1903 )
YES
NO
YES
Check SI4800( Q315)1,2,3Pin 1.9V
Normal?
Replace SI4800( Q315)
Replace SC2621(IC304)
YES
NO
NO
Check between FB1714 and C345
1.2V
Normal?
Replace SI4800( Q300,Q301)
Replace SC2621(IC304)
NO
NO
NO
POWER
1. Video
(12) POWER2
- 23 -
EXT1/2
AT/NT
TUNER
X260
TP A
HDMI 1/2/3
TP C
RGB
COMP 1/2
SIF
SIF IN 1
NTP
3000
SIF IN 2
I2S IN 1
I2S IN 2
I2S OUT 1
SPDIF 
ıÛ
CS8416
I2S
I2S
I2S
I2S
S/PDIF
SPDIF
L/R
L/R
L/R
L/R
ANT/Cable
TP
MSP4450K
MNT
OUT
I2S
I2S
I2SI 3
I2SO 1
SC 2
MCLK
MCLK
SPDIF OUT
Optical
Coaxial
2. Audio
(1) All path
- 24 -
Check NTP3000 (IC505) Power
Check NTP3000 (IC505)
 
Inputs pins
#17(DATA), #18(LRCLK), #19(SCLK), #6(MCLK)
1
2
3
4
5
6
7
Check X260 (IC101)
 
Output
R153(SCLK), R154(LRCLK), R155(DATA), R156(MCLK)
Check NTP3000 (IC505)
 
Output
L510,L511(Left) / L512,L513(Right)
Check Speaker output wafer
P502(Left), P501(Right)
Check NTP3000 (IC505)
 
Output
L515,L516(Left)  L517,L518(Right)
Check Speaker
All Source Speaker Out
Check MSP4450K (IC508) Output
R5062 (Left), R5063 (Right)
1
2
3
4
If DTV or HDMI  input
Check X260 (IC101)
 
Output
R153(SCLK), R154(LRCLK), R155(DATA)
Check MSP4450K (IC508) Input
R5059(SCLK) R5060(LRCLK), R5061(DATA)
Check MNT Output Jack (J704)
Monitor L,R Out
Check MSP4450K (IC508)  Power
5
Check MSP4450K (IC508)  X-
tal
 Input
X-tal
 Input (71,72pin) : 18.432MHz
6
If ATV, AV, Component, RGB  input
Check MSP4450K (IC508) Input
C5016(ATV_SIF), R5041(AV1_R), R5042(AV1_L),
R5045(AV2_R), R5046(AV2_L), R5048(CMP1_R),
R5049(CMP1_L), R5051(CMP2_R), R5052(CMP2_L),
R5055(RGB_R), R5058(RGB_L)
Check CS8416(IC501)  Input
C5006 (X260_SPDIF) or
C5005 (HDMI_SPDIF)
Check CS8416(IC501)  Output
R590 (8416_SPDIF_out)
1
2
3
4
Check CS8416 (IC501)
 
Power
Check SPDIF Jack
P500 (Optical SPDIF Jack) and
P501 
(Coaxial SPDIF Jack)
Digital Audio Out
Common Sound Out
Common Sound Out
2. Audio
(2) Common Sound Out
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