LG 50PB2DR-AC (CHASSIS:PB61C) Service Manual ▷ View online
- 25 -
Snow noise (White dot) ?
Power off and on
(TV or STB/DVD
)
Video is normal & No Sound ?
Check HDCP Power Pin(IC604),
MST3361(IC603)
IIC(#69,#70)
Check MST3361(IC603) inputs
Power, Osc
#25,#26(RX1C-,RX1C+),
#14,#15(RX0C-,RX0C+)
Re-download EDID(IC605,IC606)
Check MST3361(IC603)
Outputs
V-out (#99) , H-out (#98) , Clock (#96)
, Data
Check CY2309
(IC203)
REF(#1), CLKA4(#15)
1
2
3
4
5
6
N
Y
N
Y
YY
Y
Y
Check
CPLD (IC301) V-Sync,
H-Sync Output #95(VD), #96(HD)
1 : _Check HDCP Error
_Retry power off and on (TV or STB/DVD
)
_Check MST3361(IC603) HDCP IIC line (#69,#70)
2 : _Check EDID Download
(RX0C-,RX0C+
) :
Frequency : Different according to
format !!
4 : _Check
MST3361(IC603) Outputs
5 : _Check
CPLD (IC301) V-Sync, H-Sync Output #95(VD), #96(HD)
_Signal shape is same (above)
SCL :
SDA :
3 : _
MST3361(IC603) inputs
(RX1C-,RX1C+
) :
(Vsync
) :
(DE) :
(Clk
) :
(Hsync
)
59.94Hz
Frequency : Different according to
format !!
(Data) :
6 : _Check
CY2309 (IC203) REF(#1), CLKA4(#15)
_Signal shape is same (above)
(7) PVR HDMI/DVI
- 26 -
Check Antenna Cable
Check PAL/DVB-T Tuner(TU1302),
IF out
Check HD2.4(LGDT1102F) Input
CLK, SOP, Valid, Error, Data
Check PVRSoc(LGDT1304)
DTV
Check CPLD(IC305) Inputs
CLK, SOP, Valid, Error, Data
NG
Check CPLD(IC305)Outputs
CLK, SOP, Valid, Error, Data
3 : _
In case of DTV Check CPLD(IC305) Inputs (CLK, SOP, Valid, Error, Data)
_ Signal Shape is same (above)
4. _Check CPLD(IC305) Inputs (CLK, SOP, Valid, Error, Data)
5. _ Check PVRSoc(LGDT1304)
6._ Check CPLD(IC305)Outputs (CLK, SOP, Valid, Error, Data)
7._ Check HD2.4(LGDT1102F) Input (CLK, SOP, Valid, Error, Data)
Is it 3.3V #15, 1.8V #14 output of
TUNER(TU1302)
Check CPLD(IC305) Inputs
CLK, SOP, Valid, Error, Data
Check CPLD(IC305)Outputs
CLK, SOP, Valid, Error, Data
(8) PVR Digital TV
- 27 -
Check HDD power cable,
Wafer(P1601)
Check HDD Signal Cable(SATA),
Wafer(P1000)
Check SiI3512(IC1002)
Power pins,
Osc
, PCI Bus, LED1000
Check CPLD(IC305) inputs
(CLK), (SOP), (Valid),
(Error),(Data
)
Check CPLD(IC305) outputs
(CLK), (SOP), (Valid),
(Error),(Data
)
1
2
5
4
3
Check PVRSoc
LGDT1304P
(IC908)
1.
Check HDD Power cable. #1: 5V, #4:12V
2.
Check HDD Signal cable (SATA)
3.
Check SiI3512(IC1002) inputs: Power pins,
Osc
¥
Check LED1000 blinking
¥
Check PCI bus
4.
Check CPLD(IC305) inputs:
(Clock, Sop, Valid, Error, Data : 8bit)
PVRSoc
Memory Test :
(Hardware test Menu)
5. Check CPLD(IC305) outputs:
(Clock, Sop, Valid, Error, Data : 8bit)
(9) PVR HDD PLAY BACK
- 28 -
Symptom : When TV set powers on, LED is blinking in seconds. And power off(LED is red)
Fan operate normally?
Replace Fans and recheck
5V MNT(P1604 #6) is 5V HIGH?
Check P1604
AC DETECT(P1604 #1) is 5V HIGH ?
NO
No
NO
NO
Replace power board
Normal?
NO
Replace Power board
Normal?
Check P1603 (power)
Power lines and GND short?
Replace A/V board
or digital board
NO
NO
Check A/V board
Micom
Check A/V board
Micom
YES
YES
Check Fan wafers
and connectors.
Normal?
Check Fans
Fan(P1606), upper/side
( 50
: 1EA, 42
: No FAN )
(10) PROTECT MODE
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