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CONTENTS
I. Troubleshooting Guideline 3
II. Checkpoints in the Event of a Problem
1. Basic Inspection
- Not Working When Powered On 4
- Malfunction of Front Display or Keys 5
- Malfunction of Remote Control Unit 6
- Not Working When Powered On 7
- Does Not Boot after Power On or System Reset 8
2. CPU/System Memory Inspection
- Error Occurs During S/W Installation or Updating 9
System Stops During Initial Booting or Operation
3. Channel Inspection
- Lack of Channel Locking even though No Problems with Power/CPU (1) 10
- Lack of Channel Locking even though No Problems with Power/CPU (2) 11
- Lack of Channel Locking even though No Problems with Power/CPU (3) 12
4. MPEG Inspection
- No Problems Found during Basic and CPU/System Memory Inspections,
but MPEG Does Not Play 13
5. CI I/F Inspection
- Tuner Locked but No Channel Search 14
- CAM Not Detected 15
- CAM Detected, but No MPEG Play on a Scrambled Channel 16
6. Smart Card Inspection (IRCI-8400P, NACI-8700P)
- Card Not Detected or No MPEG Play on a Scrambled Channel 17
7. A/V Inspection
- No Video Output 18
- Not Audio Output 19
- Cannot Change the Screen Ratio [4:3 <-> 16:9] 20
- TV -> VCR Bypass Does Not Work 21
- VCR -> TV Bypass Does Not Work 22
- Cannot Switch between CVBS (S-VIDEO) <-> RGB 23
- No SPDIF Output 24
8. HDD Inspection
- Cannot Perform HDD-related Operations (tsr, recording) (1) 25
- Cannot Perform HDD-related Operations (tsr, recording) (2) 26
III. PCB Layout 27 ~ 28
IV. Block Diagram ??
V. Circuit Diagram and Waveform Diagram ?? ~ ??
VI. BOM (Bill of Material) ?? ~ ??
VII. Apparatus Drawing and Assembly Diagram ??
Troubleshooting Guideline
I. The repair of broken and defective sets should follow the recommended flow described below:
Broken
or
Defective?
Check assembly of the set, condition of connectors, condition
Visual Inspection of the PCB, for poor soldering or short circuiting of parts, and
for visual defects, and take appropriate measures.
If the set does not work after power-on, inspect the basic
Basic Inspection
operation of the SMPS and the Front I/F system.
Check if the STi5518 CPU and the flash memory are working
CPU/Flash
properly. To this end, check the items essential to the basic
Memory Inspection
operation of the set, such as memory access.
Check the front-end section that outputs the 22 kHz tone
signal and the DC power source that receives, tunes, and
Channel Inspection
locks the RF signals from the antenna LNB and operates the
LNB.
If channel searching fails even after locking [the signal level
MPEG Inspection and quality are normal], check for any problems with the
MPEG memory and the ts line.
If FTA channels are working normally, but MPEG play does
CI Inspection not work from a scrambled channel, check for problems with
CAM detection.
If MPEG play is normal in the case of FTA channels, but if
Smart Card MPEG play does not work for a scrambled channel on a CAS
Inspection model (IRCI-8400P, NACI-8700P), check for problems with
Smart Card detection.
Check the processes from MPEG decoding to A/V output, and
AV Inspection check the functions at the output jacks (CINCH, SCART, RF
Modulator, and SPDIF) on the back panel.
If the HDD functions (tsr, recording) do not work,
HDD Inspection check for problems with the i/f between the HDD power and
the CPU.
II. The illustrations and waveforms contained in this manual may differ depending on the system
condition and the signal being received. Use them only as a reference material.
What is important is to identify the location of the problem by tracing the flow of related signals.
It is recommended that you refer to the following example waveforms as reference material on related
signal patterns.
Basic Inspection 1
Not Working When Powered On.
Preliminary Checkpoints
Check the condition of the SMPS input power cable connection.
Check the condition of the fuse protecting the Transformer.
Check for short circuits between each power terminal and the ground.
Not Working When
Powered On.
OK Check the *JP 1
Check other modes related
voltage output of each 1. ON/OFF
to the Main Board.
port of JP1. - HDD Power[+5v.+12v]
control signal
- high[operation], low[standby]
NG 2. GND
3. +30V(+/- 2.0v)
4. GND
5. +24V(+/- 2.0v)
NG Disconnect the 6. GND
Check and replace the
JP1 cable and check 7. +17V(+/- 1.0v)
SMPS.
the output. 8. GND
9. +12V(+/- 0.8v)
10. GND
OK 11. +7.5V(+/- 0.5)
12. GND
13. +5V(+/- 0.25v)
Check the soldering 14. +3.3V(+/-0.16v)
of parts connected to Check for short 15. +3.3V(+/-0.16v)
OK circuits at each power
the corresponding
power supply. supply port.
"Useful Tips"
NG
Check other modes related
to the main board.
Useful Tips
* Power Supply Points*
1. +30 V: DUMMY
2. +24 V: DUMMY
3. +17 V: DUMMY
4. +12 V: U430 (6412)
5. + 7V5: use for U505 (TUNER and RF modulator power)
6. +5V : Use for U21 (AT89S52), Q260,Q261(Use as pull-up resistor for IIC transition),
JP350 (Use for ROM connector power), U360 (24LC64), JP450 (TOTX178A),
JP580~1 (Smart card power), U600 (HIN232ECB), U430 (6412)
7. +3V3 : D50(1N5402), U503(TDA10021/B3), U502 (LM1117-1.8), U182 (5518), U300 (KIA7027AF),
Q300~301 (tr's collect power for flash reset), U311 (KA5SDKAS01TSN), U330 (INTEL FLASH)
U371 (EMI SDRAM), U390 (SMI SDRAM), U517(KIA7029AF)
Page 4
Basic Inspection 2
Malfunction of Front Display and Keys
Preliminary Checkpoints
Check the cable connection between Front b/d and Main b/d.
Malfunction of
Front Display and
Keys
Waveform
U21 : AT89S52 Basic 2-1
U182 : 5518
NG
U-Com U21
(AT89S52)
NG Reset Cap.(C38) Check
Pin 4, C38
Reset Check
OK
Waveform
Basic 2-2
U-Com U21
(AT89S52)
NG 24MHz crystal Check
Pin 14,15 Crystal
Waveform Check(24MHz)
Basic 2-3
OK
* Check u-com UART.
- STi5518 for key scan -> transmits 0x51 with
ucom 10ms interval
U-Com U21
- ucom -> transmits STi5518 ACK(0xFA) (AT89S52) Check soldering and
NG
UART check replace u-com.
- waveform of AT89S52 pin5 check
If (STi5518 -> ucom) is output, but the
waveform of pin7 (ucom -> STi5518) is not
output, check AT89S52.
OK
Check for other defective
modes.
Handling the RCU during Operation/Standby
1. Operation mode
- The output of RCU Sensor FRP-5530HL (U1) is directly connected to STi5518 through Inverter(U23).
- u-com by 4key input, 3 Led & 7-segment display
2. Standby mode
- Handles the RCU at Micom (AT89S52), Power down mode for STi5518
- u-com by 1 standby key input, Red LED & 7-segment display
Page 5
Basic Inspection 3
Malfunction of Remote Control Unit
Preliminary Checkpoints
Check the battery condition when the RCU malfunctions.
Malfunction of Remote
Control Unit
Check the battery of
the RCU.
U901 : FRP-5530HL
=> Front B/D
U703 : 74LVT00
=> CPU B/D
Check the RCU battery. NG Replace the battery.
OK
Waveform
Basic 3-1
Check the FRP-
Check the L33
NG 5530HL(U1) OUT NG Replace FRP-5530HL.
waveform.
terminal PIN 3.
OK
OK Check for short circuits
around the circuitry.
Waveform
Basic 3-2
Check U703.PIN12,
Check for short circuits
13 and output (PIN11) NG
around the circuitry.
waveforms.
OK
Check for other
defective modes.
Useful Tips
1. Check the waveform of L33 and if it is abnormal, open L33 and check the waveform
of the input terminal of L33. If the waveform is abnormal, check the output waveform of FRP-
5530HL[U901.3PIN] of Front b/d. If the waveform is abnormal, replace FRP-5530HL.
Page 6
Basic Inspection 4
Not Working When Powered On
Preliminary Checkpoints
Check the System Clock (27.0 MHz) and the Reset terminal of STi5518.
The clocks internal to IC STi5518 basically drive the external 27.0 MHz system clock to
multiply or divide to generate various clocks for use.
The RESET of IC STi5518 is connected to FLASH through GLUE LOGIC.
Power Supply is U182 : 5518
Normal but the Set U300 : KIA7027AF[Reset IC]
Does Not Work U311 : KA5SDKAS01TSN
Waveform
Basic 4-1
STi5518
SYSTEM CLOCK NG Check the VCXO and
27.0MHz(PIN 120) related parts.
CHECK
Waveform
Basic 4-2
OK
IC STi5518)
SMI SDRAM NG Check the Clock Divider
CLOCK (PIN 95) and the SMI SDRAM.
CHECK
Waveform
OK
Basic 4-3
IC STi5518
RESET NG
Check the RESET IC part.
(PIN 124)
CHECK
Waveform
OK Basic 4-3
Flash Memory
RESET NG Check the Q300 and Q301
Q301 - Pin 2 I/O RESET.
CHECK
OK
Check for other
defective modes.
Useful Tips
1. Unstable 27 MHz may be due to a defective VCXO or STi5518 alone. Replace the chip or VCXO.
2. When replacing parts, be careful of static charges from the tip of the solder iron that can easily
damage parts. Also, check assembly, soldering, or for incorrect or reverse insertion of parts.
Page 7
Basic Inspection 5
Does Not Boot after Power-On or System Reset
Preliminary Checkpoints
The system clock 27.0 MHz must be stable during System Reset or the Power On Reset.
However, if VCXO is defective, the clock may be unstable until RESET is released.
To check this item, turn the main power off and back on, and check if the following waveform is maintained.
Does Not Boot after System/
Power-On Reset
Waveform
U182 : 5518 Basic 5-1
U300 : KIA7027AF[Reset ic]
U311 : KA5SDKAS01TSN
Reset timing problem STi5518 RESET & Clock 27 MHz Clock problem
TIMING CHECK
Check the soldering of
Reset IC and Flash Reset Check the soldering of IC
Glue (Q300, Q301). OK STi5518 and VCXO.
: Check the soldering of NG NG
Check the JTAG Option and Check the soldering of
JTAG Option: R320, R321,
5518 CPU_WAIT (Pin131). 5518 (Pin 131).
R322, and R323.
Waveform
Basic 5-1
OK
Check the soldering of NG NG Check the soldering of
ROM CS
Flash Memory and the 5518
Check
Q350 part. -> Replace the IC.
OK
Check the soldering of the
NG NG Check the I2C Shifter.
ICs that use I2C: Check the condition of the
Q260, Q261, and the
: EEPROM, TDA10021, RF I2C Line.
resistors in their vicinity
Modulator, and STV6412
OK
Check for other defective
modes.
Useful Tips
1. The resistors of JTAG Connector, R320, R321, and R322 should be set to Pull-Up, and R323 should be
set to Pull-Down. In addition, CPU_WAIT of 5518 must be set to Pull-Down for the system to operate.
2. When replacing parts, be careful of static charges from the tip of the solder iron
that can easily damage parts. Also, check assembly, soldering, or for incorrect or reverse insertion of parts.
Page 8
CPU/System Memory Inspection
Error Occurs During S/W Installation or Update
System Stops During Initial Booting or Operation
Preliminary Checkpoints
If the system does not respond even though no problems were found on the basic inspection,
you will need to check the flash memory that contains program codes.
If the system is working normally, Flash Memory Control signals that look similar to the ones shown below
will be repeated.
The main cause of the problems related to System Memory (i.e. Flash and SDRAM) is the soldering of parts.
Therefore, in the event of a problem, first check the soldering and the power supply of IC.
Error Occurring During S/
W Installation or Update
U330 : TE28F160C3TD70
Waveform
=> [FLASH MEM.]
CPU1-1
U371 : K4S281632F-TC75
=> [EMI SDRAM]
Check the Flash
NG Access signal CE(Pin 26), OK
OE(Pin 28), and
WE(Pin 11).
Check IC STi5518
and Flash Memory. NG Check the EMI SDRAM
(Incorrect insertion, poor Access and soldering.
soldering, etc.)
Waveform
CPU1-2
OK OK
Re-check the basic Check for other
inspection items. defective modes.
Page 9
Inspection of Channel Operations
Preliminary Check Points
As channels are controlled with locking associated with the tuner and TDA10021, the repair
of channel parts should be performed with inspection of related signals.
Channel Part Repair Flow
Check working
power supply for OK Check the power source of NG +1.8V LINE U502(LM1117S)
internal tuner +5V(Pin 2) and TDA10021. POWER CHECK
+5VT(Pin 11).
NG
OK Waveform
CH 1.
Check KTA1273(Q501) and
related lines.
NG Check for 850mVpp at BIAS
Check TDA10021 IF input. 1.65V.
Waveform
CH 2.
NG Check if Y501 oscillates at
Check TDA10021 clock.
28.920MHz.
OK Waveform
CH 3.
Check the tuner/TDA10021 I2C NG Check initialization
(Pin 17,18) and Tuner I2C (Pin waveform at Power On.
19,20).
Waveform
OK
CH 4.
Check 10021CLK, 10021VLD NG CLK is approximately 5.4MHz, and
VLD is approximately 26kHz. They may
signal. vary depending on the symbol rate.
Page 10
Inspection of Channel Operations
All parts including power source/CPU are working normally, but channels
cannot be locked.
b. Working Voltage of Tuner
Preliminary Check Points
+5V/+5VT given to the tuner is the working voltage inside the tuner. If the r.ipple makes the
voltage unstable, the frequency inside the tuner is changed, causing a locking defect.
Locking Defect
NG Tuner Working Power Source Check SMPS power
Check +5V (PIN 2 => 4.75 ~ source.
5.25)
Check C504(+5V Line)
and tuner (PIN 2) part. OK
Check internal tuner Check parts related to
working power source KTA1273 (Q501).
+5VT (PIN 11 => 4.75 ~ 5.25)
OK
Check other defective
modes.
Page 11
Inspection of Channel Operations
All parts including power source/CPU are working normally, but channels
cannot be locked.
f. Working Voltage of Tuner Output IF & TDA10021
Preliminary Check Points
The tuner output IF signal is biased at TDA10021 and is about 850mVpp at 1.6V ~ 1.7V.
Locking defect
Waveform
CH 1.
Check waveforms of Tuner
NG Check the tuner parts.
(U505) IF + (PIN 14) ,
and IF - (PIN 15).
OK Waveform
CH 5.
Replace related Check TDA10021(U503) and
NG
parts. each +V/Ripple.
* TDA10021 Power Source*
+3.3V
+1.8V ( U502 ) LM1117S-1.8
OK
Check other modes.
Inspection of Channel Operations
All parts including power source/CPU are working normally, but channels
cannot be locked.
h. TDA10021 28.920MHz Clock & I2C BUS
Preliminary Check Points
The TDA10021 CLOCK Y501 28.920MHz is converted to the A/D clock through the internal divider and
used as the internal clock. Therefore, check if it produces the waveform generated by X-TAL.
The I2C BUS is generated from STi5518 for control of the tuner and TDA10021 and used
mostly for data setting necessary for channel locking and also for status reading.
Locking defect
Waveform
CH 2.
Check TDA10021(U503)
NG Check related parts.
clock (C596, C597).
OK Waveform
CH 6.
Check TDA10021 (U503),
Replace related parts. NG I2C_SDA(PIN 18), and
I2C_SCL (PIN 17).
OK Waveform
CH 3.
Check TDA10021 (U503),
Replace related parts. NG
SCLT (PIN 20), and
SDAT(PIN 19).
OK
Check other modes.
Page 13
Inspection of Channel Operations
All parts including power source/CPU are working normally, but channels
cannot be locked.
g. TDA10021 Input/Output Signal
Preliminary Check Points
TDA10021 output is mainly divided into Bit Clock, Valid, and 8BIT Data and differs slightly
depending on the transmission parameters. Each signal is generated only when 10021 internal
locking is completed.
Locking defect
OK
Waveform
CH 7.
Replace related parts. NG Check TDA10021(U503) Confirm STi5518.
Reset (PIN 16).
OK
Waveform
CH 8.
Unlocked state
Replace related parts. NG Check TDA10021(U503) if not working
TS_VLD,TS_STR. normally
OK
Check other modes.
Page 14
MPEG Inspection
No Problems Found on Basic and CPU/System Memory Inspections, but
MPEG Does Not Play
- Check MPEG SDRAM Interface/Transfer Stream (TS).
Preliminary Checkpoints
If MPEG playback does not work even though no problems were found on the Basic inspection,
CPU/Flash inspection, and Tuner Lock inspection, check the SMI SDRAM I/F of the MPEG memory sector.
SMI SDRAM of IC STi5518 is selected when the SMI_CS0 (Pin 74) signal of STi5518 is LOW.
The main cause of the problems related to System Memory (i.e. Flash and SDRAM) is the soldering of parts.
Therefore, in the event of a problem, first check the condition of the soldering and the power supply of IC.
No Problems Found on
Basic/Memory/Tuner Lock
Inspections but MPEG Play U182 : 5518
Does Not Work U390 : SMI SDRAM
Waveform
MPEG1-1
Check the STi5518
NG output SMI_CS0 & OK
SMI_CLKIN
(Pin 74 / 82).
Waveform
MPEG1-2
NG STi5518 & SDRAM
Check soldering of
Interface Signal
SMI SDRAM.
Check
OK
OK
Waveform
MPEG1-3
Re-check basic
Check path between 10021
inspection items.
and CI2000/2/STi5518. NG Transfer Stream (TS)
(Incorrect insertion, poor Line CHECK
soldering, short circuits, PR51,PR52,R511,
damage, etc.) R512,R513
OK
Check ts path of CI2000/2
(page 6, 7, and 8).
Useful Tips
1. The above checkpoints are listed in order.
Because signals will pass through various paths between the above checkpoints, if any checkpoint
shows waveforms unlike the above, refer to the circuit diagram according to the above order to
identify the location.
2. If the MPEG still does not play, check if a signal error is caused by poor soldering of the TS Data Line.
Page 15
Smart Card (CAS) Inspection
Card Not Detected or Cannot Descramble
Preliminary Checkpoints
If a problem has occurred with Smart Card operation, check the soldering
around TDA8004 and Card Reader. If no problem is found, check the condition of each signal.
It may be necessary to check whether the card has any problems by using a Smart Card B/D and
Smart Card that work normally.
Card detection
failure and
Descramble failure
Check operating
+3.3V POWER LINE NG power (+3.3V) of Smart Check related parts and
+5V POWER LINE
Card B/D and the Card replace U701 Reader.
CHECK
power (+5V).
OK
LOW
Check U700 pin 23(/OFF) LOW U700 pin 9(/PRES)
of CARD DETECT signal CHECK
S/C B/D
Waveform SC1-1 HIGH HIGH
Waveform SC1-2
ACTIVATION &
DEACTIVATION SEQUENCE Check related parts and
CHECK NG replace TDA8024T.
(ISO/IEC 7816 SPEC)
OK
Check for other
defective modes.
Useful Tips
1. When accessing Smart Card, if Activation Sequence, Deactivation Sequence, or Emergency Deactivation
Sequence (at Power-Off), which conform to ISO/IEC 7816 Spec, are not satisfied, the card may get damaged or
result in descrambling.
Page 16
A/V Inspection 1
No Video Output
Preliminary Checkpoints
If no video is output through TV/VCR SCART or CINCH while the front display and key controls are normal,
first check the 5518 video output terminal and the 6412 input voltage.
If no problems were found on the 5518 output terminal and the 6412 input voltage, check the output signal
around 6412 since the final video out is controlled by 6412.
No Video Output
U430 : STV6412AD
U505 : Tuner with RF
Waveform AV1-1
C437 : CVBS
C438 : Y Check path between 5518 and 6412.
C439 : C Check STi5518BVC NG
C440 : R
(Incorrect insertion, poor soldering,
VIDEO OUTPUT.
C441 : G short circuits, damage, etc.)
C442 : B
OK
* 5V After basic inspection (1), check
PIN1,53,47,45,43,39,37 NG path between SMPS and 6412.
* 12V
Check 6412 input voltage.
(Incorrect insertion, poor soldering,
PIN31,63 short circuits, damage, etc.)
OK
Waveform AV1-2
Check path between the devices
NG that use 5518~IIC BUS [10021,
* IIC CLOCK[PIN55] Check 6412, RF IIC DATA,
* IIC DATA[PIN56]
EEPROM ,RF, and 6412].
and CLOCK.
(Incorrect insertion, poor soldering,
short circuits, damage, etc.)
* TV_SCART OK
PIN38 : BLUE
PIN40 : GREEN
PIN42 : RED/Chrom. Check path between 6412 and
PIN44 : CVBS NG each Output con.
Check 6412 VIDEO OUTPUT.
* VCR SCART (Incorrect insertion, poor soldering,
PIN46 : Chorm. OK short circuits, damage, etc.)
PIN48 : CVBS
* CINCH, RF
PIN36 : CVBS OK
Check RF MODULATOR NG Check path between 6412 and Rf.
Check if there is no RF output. VIDEO INPUT. (Incorrect insertion, poor soldering,
C446 short circuits, damage, etc.)
Check for other defective
modes.
Useful Tips
1. Because I2C BUS continues polling, to determine whether the devices using the I2C are working
properly, check the waveforms and messages using s/w with monitor s/w or debug.
Page 17
A/V Inspection 2
No Audio Output
Preliminary Checkpoints
If no audio is output through CINCH while the system is normal, first check the 5518 AUDIO output [I2S interface].
If no problems were found, check the UDA1334 AUDIO OUT terminal and 6412 OUT to identify the problem path.
No Audio Output
U430 : STV6412AD
Waveform U505 : Tuner with RF
AV2-1
* UDA1334BTS
PIN1 : DA_CLK NG Check path between 5518 and 1334.
Check STi5518BVC I2S
PIN6 : DA_FSCLK (Incorrect insertion, poor soldering,
PIN2 : DA_WS output.
short circuits, damage, etc.)
PIN3 : DA_DATA
OK
*UDA1334 Input Voltage
3.3V[PIN4,13] Check UDA1334
OK After basic inspection 1, check the
Vref(1.65V)[PIN12] input voltage. NG path between SMPS and 1334, 6412.
Check 6412 input (Incorrect insertion, poor soldering,
* 6412 Input Voltage voltage. short circuits, damage, etc.)
5V[PIN1,53,47,45,43,39,37]
12V[PIN31,63]
Vref(4.3V)[PIN16] OK
Check UDA1334 NG Check path between 1334 and 6412.
AUDIO OUTPUT. (Incorrect insertion, poor soldering,
PIN 14,16 short circuits, damage, etc.)
Waveform AV1-2
OK
* IIC CLOCK[PIN55]
Check path between the devices
* IIC DATA[PIN56] NG that use 5518~IIC BUS [10021,
Check 6412, RF IIC DATA,
EEPROM ,RF, and 6412].
and CLOCK.
(Incorrect insertion, poor soldering,
short circuits, damage, etc.)
* TV_SCART OK
PIN32 : Right
PIN33 : Left
* VCR SCART Check path between 6412 and
PIN29 : Right Check 6412 AUDIO NG each Output con.
PIN30 : Left OUTPUT. (Incorrect insertion, poor soldering,
* CINCH short circuits, damage, etc.)
PIN27 : Right
PIN28 : Left
* Rf OK
PIN35 : MONO
Check RF MODULATOR Check path between 6412 and Rf.
NG
Check if there is RF output. INPUT. (Incorrect insertion, poor soldering,
C501 short circuits, damage, etc.)
OK
Check for other defective
modes.
Useful Tips
1. Because I2C BUS continues polling, to determine whether the devices using the I2C are working
properly, check the waveforms and messages using s/w with monitor s/w or debug.
Page 18
A/V Inspection 3
Cannot Change the Screen Ratio [4:3 <-> 16:9]
Preliminary Checkpoints
If the aspect ratio cannot be changed while the system is normal
[including A/V Inspection (1, 2)], check the SCART function voltage of 6412.
Cannot change the
Aspect Ratio
U430 : STV6412AD
OK
* 4:3 mode Check path between 6412 and
Check output voltage NG
4.5~7V TV SCART.8pin
of 6412 SBO_TV.
* 16:9 mode (Incorrect insertion, poor soldering,
D562.Cathode
9.5~12V short circuits, damage, etc.)
OK
Check for other
defective modes.
Page 19
A/V Inspection 4
T-> VCR Bypass Does Not Work V
Preliminary Checkpoints
If TV -> VCR Bypass does not work while the system is normal [including A/V Inspection
(1, 2)], check the input and output of 6412.
Cannot change the
Aspect Ratio
U430 : STV6412AD
Check path between 6412 and TV
Check output voltage of NG
* TV -> VCR BYPASS: SCART.
6412 SBO_TV.
0~2V (Incorrect insertion, poor soldering,
D562.Cathode
short circuits, damage, etc.)
OK
* VIDEO Input
PIN21 :CVBS Check path between TV SCART
NG and 6412 input.
Check 6412 A/V INPUT.
* AUDIO Input (Incorrect insertion, poor soldering,
PIN22 : Left short circuits, damage, etc.)
PIN23 : Right
OK
* VIDEO Input
PIN21: CVBS Check path between 6412 and
NG VCR SCART.
Check 6412 A/V OUTPUT.
* AUDIO Output (Incorrect insertion, poor soldering,
PIN29: Right short circuits, damage, etc.)
PIN30: Left
OK
Check for other
defective modes.
Page 20
A/V Inspection 5
VCR -> TV VCR -> TV Bypass Does Not Work.
Preliminary Checkpoints
If VCR -> TV Bypass does not work while the system is normal [including A/V Inspection (1, 2)],
check the input and output of 6412.
Cannot change the
Aspect Ratio
Waveform AV5-1,
AV5-2, AV5-3, AV5-4 U430 : STV6412AD
* PIN61
-4:3 mode[4.5~7V]
-16:9 mode[9.5~12V] Check path between 6412
Check 6412 input voltage. NG and VCR SCART.
PIN61(SBO_VCR)
* PIN50 (Incorrect insertion, poor soldering,
PIN50(FBIN_VCR)
-RGB Input [1~3V] short circuits, damage, etc.)
-CVBS/S-VIDEO Input
[0~1V]
OK
* VIDEO
PIN64: Blue
PIN62: Green
Check path between 6412
PIN60: Red/Chrom. NG and VCR SCART.
PIN18: Cvbs Check 6412 A/V INPUT.
(Incorrect insertion, poor soldering,
short circuits, damage, etc.)
* AUDIO
PIN19: Left
PIN20: Right
OK
* D549.Cathode
-4:3 mode[4.5~7V]
-16:9 mode[9.5~12V] Check output Check path between 6412
voltage of 6412. NG and TV SCART.
*D562.Cathode D549.Cathode (Incorrect insertion, poor soldering,
-RGB Output [1~3V] D562.Cathode short circuits, damage, etc.)
-CVBS/S-VIDEO Output
[0~1V]
OK
* VIDEO Input
PIN38: BLUE
PIN40: GREEN
Check path between
PIN42: RED/Chrom. NG 6412 and TV SCART.
PIN44: CVBS Check 6412 A/V OUTPUT.
(Incorrect insertion, poor soldering,
short circuits, damage, etc.)
* AUDIO Output
PIN32: Right
PIN33: Left
OK
Check for other
defective modes.
Page 21
A/V Inspection 6
Cannot Switch between CVBS (S-VIDEO) <-> RGB
Preliminary Checkpoints
If CVBS (S-VIDEO) <-> RGB switching does not work while the system is normal
[including A/V Inspection (1, 2)], check fast blanking of 6412.
Cannot change
Video Mode
U430 : STV6412AD
OK
-RGB MODE[1~3V] Check path between 6412
Check output NG and TV SCART.
voltage of 6412.
-CVBS/S-VIDEO MODE (Incorrect insertion, poor soldering,
D549.Cathode
[0~1V] short circuits, damage, etc.)
OK
Check for other defective
modes.
Page 22
A/V Inspection 7
No SPDIF Output
Preliminary Checkpoints
If the SPDIF output is not working while the system is normal (including MPEG Play and A/V Output),
first check for any problems with the SPDIF output of 5518.
If no problems were found, check for any problems with the input power of the SPDIF connector.
No SPDIF Output
U182 : 5518
JP450 : TOTX178A
OK
Check path between 5518 and
NG JP450 (TOTX178A).
*5518.PIN57 Check SPDIF output of 5518.