Specifications

Circuit Descriptions, Abbreviation List, and IC Data Sheets
EN 20 TC5.1L CB9.
9.1.5 Vertical Output Section
This section mainly consists of IC301 (TDA8172), the Vertical
Coil and the related circuit. The supply voltage of IC301 are
+14V and -14V. These two voltages are provided by the LOT
section. For the vertical scan, IC101 creates a Saw-tooth
waveform at Pin16. This is the input signal of IC301. The main
task of IC101 is to create the vertical scan waveform. The
output signal of IC301 drives the Vertical Coil. If IC301 works in
normal state, Pin6 will send a square-signal to maintain a high
voltage at D214. If it does not, D214 will get a low voltage, Pin2
of IC101 senses this change and IC101 sends out a standby
signal.
9.1.6 Horizontal Output and LOT Section
The horizontal drive pulse is a square wave. IC101 creates this
waveform at Pin13. Via Q401 the signal goes to the input of
Q411. Q411 is a horizontal output triode with a damper inside.
The signal from Pin C of Q411 drives the Horizontal Coil.
When Q411 goes into cut-off state, a sub-coil inside the LOT
will generate an EHT by inductance.
9.2 IC description
9.2.1 Main IC (IC101)
Description:
The main IC is a TMPA8857CSNG, provided by TOSHIBA. It is
an integrated circuit, suited for PAL, NTSC and SECAM TV. An
MCU and a TV signal processor are integrated in a 64 pin DIP
package.
The MCU contains an 8-bit CPU, ROM, RAM, I/O-ports, timer/
counters, A/D-converters, an on-screen display controller,
remote control interfaces, IIC bus interfaces, and the closed
caption decoder.
The TV signal processor contains PIF, SIF, Video, multi-
standard chroma, deflection, and RGB processors.
Features:
MCU:
• High speed 8-bit CPU
• 12 I/O ports
• I2C bus interface (multi-master)
• 14-bit PWM output, 1 channel, for a voltage synthesizer
• 7-bit PWM output, 1 channel
• 8-bit A/D converter, 3 channels
• Remote control signal preprocessor
• Two 16-bit internal timer/counters, 2 channels
• Two 8-bit internal timer/counters, 2 channels
• Time base timer
• Watchdog timer
• 16 interrupt sources: 5 external, 11 internal
• Stop and Idle power saving modes
CCD decoder
• Digital data slicer for NTSC
OSD
• Clock generation for OSD display
• Font ROM characters: 384 characters
• Characters display: 32 columns x 12 lines
• Composition: 16 x 18 dots
• Size of character: 3 (line by line)
• Color of character: 8 (character by character)
• Display position: H 256 / V 512 steps
• BOX function
• Fringing, smoothing, italic, underline function
• Conform to CCD regulation
• Jitter elimination
TV Processor
IF
• Integrated PIF VCO, aligned automatically
• Negative demodulation PIF
• Multi-frequency SIF demodulator, without external tank-
coil
Video
• Integrated chroma traps
• Black stretch
• Y-gamma
Chroma
• Integrated chroma BPF’s
• PAL/NTSC/SECAM demodulation
RGB/Base-band
• Integrated 1 H base-band delay line
• Base-band TINT control
• Internal OSD interface
• Half-tone and transparent for OSD
• External YCbCr interface for DVD
• RGB cut-off/drive controls by bus
• ABCL (ABL and ACL combined)
Synchronization
• Integrated fH x 640 VCO
• DC coupled vertical ramp output (single)
• EW correction with EHT output
•Sync out