Philips L9.2A, Service Manual

Circuit description new circuits

GB 62

L9.2A

9.

EEPROM

Electrically Erasable Programmable 
Read Only Memory (also called NVM; 
non-volatile memory)

EHT-INFO

Extra high tension information; Beam 
current related signal from CRT to 
BIMOS.

Ext1 B

RGB External 1 Blue input signal.

Ext1 FB

RGB External 1 Fast-blanking input 
signal.

Ext1 G

RGB External 1 Green input signal.

Ext1 R

RGB External 1 Red input signal.

Ext1 Video

RGB External 1 Video input signal.

Ext2 AudioL/Mono

External 2 Audio Left input signal / 
Mono input signal.

Ext Audio/Mono

External Audio input signal / Mono 
input signal.

Ext2 AudioR

External 2 Audio Right input signal.

Ext2C

Exterial 2 SVHS Chrominance (C) 
input signal.

Ext2Video/Y

External 2 Video input signal or SVHS 
Luminance (Y) input signal.

ESD

Electrostatic Discharge

EURO

Europe; schematic/PCB information 
(only) applicable for European sets

EWD_dyn

Dynamic East-West correction to 
compensate  for variations in EHT

EWDRIVE

East-West drive correction

FB_TXT_OSD

Fast blanking signal from micro 
controller to IC7250 (BIMOS) for 
inserting or displaying TXT and OSD 
information (generated by the micro 
processor)

Filament

Filament (heater voltage) from LOT to 
CRT

FBL

Fast Blanking

FFBL

Full screen Fast Blanking

FM/AM/
Ext_VC_AudioMono

FM, AM or external mono signal from 
BiMOS to audio processor input (only 
used in Mono and Nicam L sets)

Front/Ext1AudioL

Front audio Left input signal / External 
1 Audio Left input signal.

Front/Ext1AudioR

Front audio Right input signal / 
External 1 Audio Right input signal.

GND

Ground

GND_LOT

Ground of  LOT

G_TXT_OSD

Green TXT or OSD signal from micro 
processor to the video controller 
IC7250 (BIMOS)

HD

Horizontal pulse derivation

HDRIVE

Horizontal output drive

HEW_protn

Switching signal to (de)activate the 
XRAY protection which is measured 
via pin 50 of the BIMOS (only for USA 
sets)

Hflybk

Horizontal flyback pulse used to 
monitor the horizontal oscillator

IF

Intermediate Frequency signal from 
the tuner

12C (or IIC)

2 Wire communication protocol 
between micro controller and 
integrated circuits

IC

Integrated Circuit

I/O

Input/Output

INT

Audio internal output

IR

Output signal from infrared receiver to 
micro controller. 

KeyBd1

Local keyboard control signal to micro 
controller

KeyBd2

Local keyboard control signal to micro 
controller (In protection mode KeyBd2 
is Ground)

KeyBd3

Local keyboard control signal to micro 
controller

L-

Power amplifier output to headphone 
and speaker 

L+

Power amplifier output to speaker 

LED

LED control signal from micro 
controller to LED

LATAM

Latin America; schematic/PCB 
information (only) applicable for Latin 
American (incl. Brazilian) sets

LeftOut

Audio Left signal output

LTI

Luminance Transient Improvement (= 
steepness)

MainAudioL/Mono

Audio Left/Mono signal to input power 
amplifier

MainAudioR

Audio Right signal to input power 
amplifier

MON

Audio monitor output

NICAM

Near Instantaneous Companded 
Audio Muliplex (digital audio)

NR

Noise Reduction

NTSC

NTSC colour system

OSD 

On Screen Display

P0Sys1/AM

Switching signal with several 
functions:

BiMOS crystal 
selection (only for 
Latam sets)

Selection of AM or FM signal (used in 
combination with P1Sys2/
AMFM_ExtSel) (only for Europe)

Sys2/AMFM_ExtSel

Switching signal with several 
functions: BIMOS crystal selection 
(only for Latam sets) Selection of 
internal AM/FM signal or an external 
signal (used in combination with 
P0Sys1/AM)

LLp/Mtrap

Switching signal with several 
functions: M-trap (sound filtering) 
switching (only for A/P Pal Multi sets) 
BiMOS crystal selection (only for 
Latam sets), Selection of L or L' 
system (only for Europe sets)

Dual/Mono

Switching signal to select the sound 
filter in dual-system Mono sets (BG/I, 
BG/DK or I/DK).

ScartPin8/SVHS

Switching signal from I/O to micro 
controller with several functions: 
Scart1 I/O: detects signal type 
connected to Scart 1 (no signal, 16:9 
signal, 4:3 signal) (only for Europe) 
Cinch I/O: detects signal type 
connected to cinch: SVHS or CVBS 
(not for Europe)

BassSw

Bass switching signal (only for some 
mono sets) 

TrebleSw

Treble switching signal (only for some 
mono sets)

Ext1/2

Used in L9-ITV sets (Hotel TV)

protn

Signal from E-W and LOT output to 
micro controller to (de)activate the 
protection mode

Mute/Volume

Audio mute / Volume control signal pin

POR/CLK

Power on reset (only used in L9-ITV 
sets)

R-

Power amplifier output " R- " to 
speaker 

R+

Power amplifier output " R+ " to 
headphone and speaker 

RAM

Random Access Memory

RESET

Reset signal to micro controller

RF_AGC

Automatic gain control signal from 
BiMOS output to tuner input.

RGB

Red-Green-Blue