CAUTION:
Before servicing this chassis, it is important that the service technician read the "Safety
Precautions" and "Product Safety Notices" in this service manual.
ATTENTION:
Avant d'effectuer l'entretien du châassis, le technicien doit lire les «Précautions de sécurité»
et les «Notices de sécurité du produit» présentés dans le présent manuel.
VORSICHT:
Vor Öffnen des Gehäuses hat der Service-Ingenieur die ,,Sicherheitshinweise" und ,,Hinweise
zur Produktsicherheit" in diesem Wartungshandbuch zu lesen.
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
Data contained within this Service
manual is subject to alteration for
improvement.
Les données fournies dans le présent
manuel d'entretien peuvent faire l'objet
de modifications en vue de perfectionner
le produit.
Die in diesem Wartungshandbuch
enthaltenen Spezifikationen können sich
zwecks Verbesserungen ändern.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
Colour Television
December 2003
No. 0203
22LD4200
22LD4200UK
i
22" TFT TV Service Manual
TABLE OF CONTENTS
1.
INTRODUCTION.......................................................................................................................................1
2.
TUNER......................................................................................................................................................1
3.
IF PART (TDA988X) .................................................................................................................................1
4.
MULTI STANDARD SOUND PROCESSOR ............................................................................................1
5.
AUDIO AMPLIFIER STAGE WITH AN7522 .............................................................................................2
6.
POWER.....................................................................................................................................................2
7.
MICRO-CONTROLLER SDA55XX ...........................................................................................................2
7.1.
General Features ...............................................................................................................................2
7.2.
External Crystal and Programmable Clock Speed ............................................................................2
7.3.
Micro-controller Features...................................................................................................................2
7.4.
Memory ..............................................................................................................................................2
7.5.
Display Features ................................................................................................................................2
7.6.
ROM Characters ................................................................................................................................3
7.7.
Acquisition Features ..........................................................................................................................3
7.8.
Ports...................................................................................................................................................3
8.
SERIAL ACCESS CMOS 16K (2048*8) EEPROM ST24C16 ..................................................................3
9.
CLASS AB STEREO HEADPHONE DRIVER TDA1308..........................................................................3
10.
SAW FILTERS ..........................................................................................................................................3
11.
IC DESCRIPTIONS...................................................................................................................................4
11.1.
LM1117 ..........................................................................................................................................4
11.2.
LM2576 ..........................................................................................................................................5
11.3.
LM317T ..........................................................................................................................................6
11.4.
TFMS5360......................................................................................................................................6
11.5.
ST24LC21 ......................................................................................................................................7
11.6.
SST37VF040..................................................................................................................................8
11.7.
TEA5114A ......................................................................................................................................9
11.8.
TEA6415 ......................................................................................................................................10
11.9.
VPC3230D ...................................................................................................................................11
11.10.
SDA55XX (SDA5550) ..................................................................................................................13
11.11.
TDA9885/86 .................................................................................................................................14
11.12.
TDA1308 ......................................................................................................................................15
11.13.
AN7522N......................................................................................................................................15
11.14.
PI5V330........................................................................................................................................16
11.15.
GM6015........................................................................................................................................17
11.16.
SAA3010T ....................................................................................................................................18
11.17.
AD9883A ......................................................................................................................................19
11.18.
MC141585....................................................................................................................................22
11.19.
MC34063......................................................................................................................................24
11.20.
MSP34X0G ..................................................................................................................................25
11.21.
DS90C385....................................................................................................................................27
11.22.
LM1084 ........................................................................................................................................30
12.
SERVICE MENU SETTINGS..................................................................................................................31
12.1.
ADJUST MENU SETTINGS.........................................................................................................31
12.2.
OPTIONS MENU SETTINGS ......................................................................................................32
12.3.
APS WSS TEST MENU ...............................................................................................................36
13.
BLOCK DIAGRAMS................................................................................................................................37
14.
CIRCUIT DIAGRAMS .............................................................................................................................41
15.
ASSEMBLY DIAGRAM ...........................................................................................................................52
1
22" TFT TV Service Manual
1. INTRODUCTION
22" TFT-LCD TV is a
Progressive TV control system based on the µ-controller SDA555X, with built-in de-
interlacer and scaler.
TFT TV is a progressive scan flicker free colour television with PC input, driving an WXGA (1280*720)
panel with 16:9 aspect ratio. The chassis is capable of operation in PAL, SECAM, NTSC (playback) colour
standards and multiple transmission standards as B/G, D/K, I/I', and L/L´. Sound system output is
supplying 2x3W (10%THD) for left and right outputs of 16 speakers. The chassis is equipped with two full
SCART's, one front-AV, one SVHS, one D-Sub 15 (PC) input, one PC stereo audio input and one line out
(left and right) and one HP outputs.
2. TUNER
As the thickness of the TV set has a limit, a horizontal mounted tuner is used in the product, which is
suitable for CCIR systems B/G, H, L, L´, I/I´, and D/K. The tuning is available through the digitally
controlled I
2C bus (PLL). Below you will find info on the Tuner in use.
General description of UV1316:
The UV1316 tuner belongs to the UV 1300 family of tuners, which are designed to meet a wide range of
applications. It is a combined VHF, UHF tuner suitable for CCIR systems B/G, H, L, L', I and I'. The low IF
output impedance has been designed for direct drive of a wide variety of SAW filters with sufficient
suppression of triple transient.
Features of UV1316:
1. Member of the UV1300 family small sized UHF/VHF tuners
2. Systems CCIR: B/G, H, L, L', I and I'; OIRT: D/K
3. Digitally controlled (PLL) tuning via I
2C-bus
4. Off-air channels, S-cable channels and Hyper band
5. Compact size
6. Complies to "CENELEC EN55020" and "EN55013"
Pinning:
1.
Gain control voltage (AGC)
:
4.0V, Max: 4.5V
2.
Tuning voltage
3.
I²C-bus address select
:
Max: 5.5V
4.
I²C-bus serial clock
:
Min:-0.3V, Max: 5.5V
5.
I²C-bus serial data
:
Min:-0.3V, Max: 5.5V
6.
Not connected
7.
PLL supply voltage
:
5.0V, Min: 4.75V, Max: 5.5V
8.
ADC input
9.
Tuner supply voltage
:
33V, Min: 30V, Max: 35V
10.
Symmetrical IF output 1
11.
Symmetrical IF output 2
3. IF PART (TDA988X)
The TDA9885 is an alignment-free single standard (without positive modulation) vision and sound IF signal
PLL.
The TDA9886 is an alignment-free multistandard (PAL, SECAM and NTSC) vision and sound IF signal
PLL demodulator for positive and negative modulation including sound AM and FM processing.
Both devices can be used for TV, VTR, PC and set-top box applications.
4. MULTI STANDARD SOUND PROCESSOR
The MSP34x0G family of single-chip Multistandard Sound Processors covers the sound processing of all
analog TV-Standards worldwide, as well as the NICAM digital sound standards. The full TV sound
processing, starting with analog sound IF signal-in, down to processed analog AF-out, is performed on a
single chip.
These TV sound processing ICs include versions for processing the multichannel television sound (MTS)
signal conforming to the standard recommended by the Broadcast Television Systems Committee (BTSC).
The DBX noise reduction, or alternatively, Micronas Noise Reduction (MNR) is performed alignment free.
Other processed standards are the Japanese FM-FM multiplex standard (EIA-J) and the FM Stereo Radio
standard.
Current ICs have to perform adjustment procedures in order to achieve good stereo separation for BTSC
and EIA-J. The MSP 34x1G has optimum stereo performance without any adjustments.
2
22" TFT TV Service Manual
5. AUDIO AMPLIFIER STAGE WITH AN7522
The AN7522 is an audio class-AB amplifier assembled in SIL-12 Pin Plastic Package specially designed
for sound cards application. Using this IC chassis operates as a stereo TV set. AN7522 has stand-by
feature for low stand-by power consumption and mute feature for pop noise free opening and closing the
TV set. It can deliver 2*3W without clipping at 12V/16 applications.
6. POWER
The LM2576 series of regulators are monolithic integrated circuits ideally suited for easy and convenient
design of a stepdown switching regulator (buck converter). All circuits of this series are capable of driving
a 3.0A load with excellent line and load regulation. Two different versions (one having a fixed output
voltage of 3.3 V, and one with 5.0 V) of this IC are used in the regulator board.
7. MICRO-CONTROLLER SDA55XX
7.1. General Features
· Feature selection via special function register
· Simultaneous reception of TTX, VPS, PDC, and WSS (line 23)
· Supply Voltage 2.5 and 3.3 V
· ROM version is used.
7.2. External Crystal and Programmable Clock Speed
· Single external 6MHz crystal, all necessary clocks are generated internally
· CPU clock speed selectable via special function registers.
· Normal Mode 33.33 MHz CPU clock, Power Save mode 8.33 MHz
7.3. Micro-controller Features
· 8bit 8051 instruction set compatible CPU.
· 33.33-MHz internal clock (max.)
· 0.360 µs (min.) instruction cycle
· Two 16-bit timers
· Watchdog timer
· Capture compare timer for infrared remote control decoding
· Pulse width modulation unit (2 channels 14 bit, 6 channels 8 bit)
· ADC (4 channels, 8 bit)
· UART (rxd, txd)
7.4. Memory
· Up to 128 Kilobyte on Chip Program ROM
· Eight 16-bit data pointer registers (DPTR)
· 256-bytes on-chip Processor Internal RAM (IRAM)
· 128bytes extended stack memory.
· Display RAM and TXT/VPS/PDC/WSS-Acquisition-Buffer directly accessible via MOVX
· UP to 16KByte on Chip Extended RAM (XRAM) consisting of;
- 1 Kilobyte on-chip ACQ-buffer-RAM (access via MOVX)
- 1 Kilobyte on-chip extended-RAM (XRAM, access via MOVX) for user software
- 3-Kilobyte Display Memory
7.5. Display Features
· ROM Character set supports all East and West European Languages in single device
· Mosaic Graphic Character Set
· Parallel Display Attributes
· Single/Double Width/Height of Characters
· Variable Flash Rate
· Programmable Screen Size (25 Rows x 33...64 Columns)
· Flexible Character Matrixes (HxV) 12 x 9...16
· Up to 256 Dynamical Redefinable Characters in standard mode; 1024 Dynamical Redefinable Characters
in Enhanced Mode
· CLUT with up to 4096 colour combinations
· Up to 16 Colours per DRCS Character
· One out of 8 Colours for Foreground and Background Colours for 1-bit DRCS and ROM Characters
3
22" TFT TV Service Manual
7.6. ROM Characters
· Shadowing
· Contrast Reduction
· Pixel by Pixel Shiftable Cursor With up to 4 Different Colours
· Support of Progressive Scan and 100 Hz.
· 3 X 4Bits RGB-DACs On-Chip
· Free Programmable Pixel Clock from 10 MHz to 32MHz
· Pixel Clock Independent from CPU Clock
· Multinorm H/V-Display Synchronisation in Master or Slave Mode
7.7. Acquisition Features
· Multistandard Digital Data Slicer
· Parallel Multi-norm Slicing (TTX, VPS, WSS, CC, G+)
· Four Different Framing Codes Available
· Data Caption only limited by available Memory
· Programmable VBI-buffer
· Full Channel Data Slicing Supported
· Fully Digital Signal Processing
· Noise Measurement and Controlled Noise Compensation
· Attenuation Measurement and Compensation
· Group Delay Measurement and Compensation
· Exact Decoding of Echo Disturbed Signals
7.8. Ports
· One 8-bit I/O-port with open drain output and optional I 2 C Bus emulation support (Port0)
· Two 8-bit multifunction I/O-ports (Port1, Port3)
· One 4-bit port working as digital or analogue inputs for the ADC (Port2)
· One 2-bit I/O port with secondary function (P4.2, 4.3, 4.7)
· One 4-bit I/O-port with secondary function (P4.0, 4.1, 4.4) (Not available in P-SDIP 52)
8. SERIAL ACCESS CMOS 16K (2048*8) EEPROM ST24C16
The ST24C16 is a 16Kbit electrically erasable programmable memory (EEPROM), organised as 8 blocks
of 256*8 bits. The memory is compatible with the I²C standard, two wire serial interface, which uses a bi-
directional data bus and serial clock. The memory carries a built-in 4 bit, unique device identification code
(1010) corresponding to the I²C bus definition. This is used together with 1 chip enable input (E) so that up
to 2*8K devices may be attached to the I²C bus and selected individually.
9. CLASS AB STEREO HEADPHONE DRIVER TDA1308
The TDA1308 is an integrated class AB stereo headphone driver contained in a DIP8 plastic package. The
device is fabricated in a 1 mm CMOS process and has been primarily developed for portable digital audio
applications.
10.SAW FILTERS
K3953M is an IF Filter for Video Applications. The package is SIP5K. Supported standards are B/G, D/K, I,
L/L'.
K9656M is an IF Filter for Audio Applications. The package is SIP5K. Supported standards are B/G, D/K, I,
L/L'.