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5. TroubleShootiong
No Power Detected
Check the Power No
Connect Power Plug
Plug connection
Yes
Checkt heVol t ageat No Check PAFT1(Fuse)
PACT1's both ends "REMOVE"and Change
of AC input voltage
Yes
Check the Themistor
Measure the voltage
No (PLRU1 :3D-9)
of PRCU1
Check the shoting of
both of input voltage
PQIZ1
Yes
Check the voltage No If the controller is
of Vcc for SMPS operating unstably or no
controller operation,change the PQIZ1
Yes
Check the No Check the shorting at
connection at
several main power
several main power
Yes
Connect between SMPS and Main Power
Samsung Electronics 5-1
Troubleshooting
TV channel Missing
Antenna Cable is No
connected well ? Connect Antenna cable.
Yes
Check tuner's
(TM101/TM102) No Check Voltage drive
voltages.5,12pin=5V,6pin=32V,14,15pin=3.3V circuit and repair trouble.
and 16pin(Reset)="High"
Yes
Check I2C data bus of two No Check I2C bus line
Tuners R110(R210), R109(R209). between tuner and CPU.
Data/clock signal OK?
Yes
Check the TS data at
RN101(RN201)~RN102(RN202) No
Change for same spec tuner.
and clcok at R114(R214).
Data &clock OK?
Yes
Check serial resisters' No Correct resistors of
condition of TS &control pins. location(R105~R116).
No problem ?
Yes
Check Decoder "U302".
R110,R109_1_I2C_DATA R110,R109_1_I2C_CLK RN101,RN102,R114_ RN101,RN102,R114
1_TS_DATA 1_TS_CLK
5-2 Samsung Electronics
Troubleshooting
Composite Video signal Missing (RCA Connector)
Check CVBS at No
Check Failure mode of U302
R713
Yes
Check Failure mode of
Check CVBS at No Video filter(C756,L708,
4pin of U701 C763,C773,R736,C715)
Yes
Check CVBS at No
Check Failure mode of U701
36pin of U701
Yes
Check Failure mode of J703
U302_2_CVBS_1 U701_2_CVBS_2 U701_2_CVBS_4
Samsung Electronics 5-3
Troubleshooting
Composite Video signal Missing
(SCART Connector)
Check CVBS input No
Check Failure mode U302
at R713
Yes
Check CVBS at 4pin No Check Video filter circuit
of U701 (C756,L708.C763,C773,R736,L715)
Yes
Check CVBS at No
Check Failure mode of U701
44pin of U701
Yes
Check CVBS at
No
19pin of Check R806,R812,C809
Scart Connector
Yes
Check Failure mode
of J801 SCART Connector
U302_2_CVBS_1 U701_2_CVBS_2 U701,R806,R812,C8092_CVBS_4
5-4 Samsung Electronics
Troubleshooting
RGB Signal Missing (SCART Jack)
U302 R,G,B_3_R Check DTV Output Select No
switch RGB mode or not. Change to RGB mode.
Yes
U302 R,G,B_3_G
Check R/G/B signal No Check Failure mode
at R708,R709,R710 of U302(STi5100).
Yes
U302 R,G,B_3_B Check Open or Short at
Video filter circuit.
Check R/G/B signal No
R :C755,L710,C767,C771,R738
at C712,C711,C710
G :C761,L711,C766,C772,R741
B :C757,L707,C764,C770CR740
Yes
U701 R,G,B_3_R_1
Check R/G/B signal No Check Failure mode
at Pin 42,40,38 of U701 of U701(STV6412A)
Yes
U701 R,G,B_3_G_1
Check Open or Short at
No the circuit
Check R/G/B signal at
R :R805,R811,C808
Pin15,11,7 of SCART Jack
G :R804,R810,C807
B :R803,R809,C806
Yes
U701 R,G,B_3_B_1
Check RGB-Jack Connection
(STB <->TV).
Samsung Electronics 5-5
Troubleshooting
SPDIF Output Missing (Optical)
Check +5V No
Check +5V Drive
at Pin2 of J702
Yes
Check Digital Audio signal No
Check Failure mode U302(STi5100)
at R714
Yes
Check J702 Optical Jack
Failure mode
U302_4_digital_audio
5-6 Samsung Electronics
Troubleshooting
RCA Sound Output Missing
Check Analog Audio No Check Failure mode
Signal at C704,C706 of U302(STi5100)
Yes
Check Failure mode of
Check Analog Audio No U702 and Application
Signal C725,C732 Circuit pin 8 =12V
Yes
Check Analog Audio No Check of U701(STV6412)
output at Pin28,27 of U701 Failure mode.
Yes
No Check U1001
Check Audio signal at
Failure mode and
L706,L705
application circuit
Yes
Check Failure mode
of J703(RCA Connector)
U302,U702_5_audio U701,U1001_audio_1
Samsung Electronics 5-7
Troubleshooting
Scart Sound Output Missing
Check Analog Audio No Check Failure mode
Signal at C704,C706 of U302(STi5100)
Yes
Check Failure mode of
Check Analog Audio No U702 and Application
Signal C725,C732 Circuit pin 8 =12V
Yes
Check Analog Audio No Check of U701(STV6412)
output at Pin33,32 of U701 Failure mode.
Yes
No Check Open or Shot
Check Analog Audio
Circuit at C801,R801,C804,
Signal at L801,L802
L801,R807
Yes
Check Failure mode
of J801(SCART Connector)
U302,U702_5_audio U701,C801,R801,C804,
L801,R8075_audio_1
5-8 Samsung Electronics
Troubleshooting
TV channel Missing
Check the Signal at No Check Failure mode
pin 1,3 of U502 of U302
Yes
Check the Voltage(5V)at No Check Failure mode of
pin 5 of U502 U501 and Circuit
Yes
Check Signal and Voltage Check Short or Open at
No
at DM(pin3),DP(pin4), VBUS(pin2)of J1202 and Flat cale
J1301(Front Board) Connection
Yes
Check Open or Short at
J1302(USB connector)on Front Board
U302_6_usb
Samsung Electronics 5-9
Troubleshooting
No Recording
Check Voltage at
pin1=5V pin4=12V No
Check Failure mode of SMPS Board
of "PZWZ2"(HDD power connector)on
SMPS board
Yes
Check the cable at HDD
power cable and ATA No
Fix the cable
Cable
Yes
Check the HDD Selection No Fix the HDD Selection =Mast er
=Mast er
Yes
No Check Open or Short at
Check the Data Signal at
U601,U602,U603,U604,U605
U603,U604,U605
and Their Circuit
Yes
Check Failure mode
of HDD
U603 PIN1_7_ata_select U603 PIN11_ U603,605 PIN2
7_ata_address 7-ata_data
5-10 Samsung Electronics