Philips FM242, Руководство по обслуживанию

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Circuit Descriptions and List of Abbreviations EN 70 FM242 AA 9.
9. Circuit Descriptions and List of Abbreviations
Index of this chapter:
1.
General
2. Power Supply unit (very limited)
3. VGA connector panel
4. SCAVIO panel
5. Audio Amplifier panel
6. LED/Switch panel
7. Plasma Display Panel
8. Abbreviations
9. IC Block diagrams
Notes:
•
Figures can deviate slightly from the actual situation, due
to different set executions.
• For a good understanding of the following circuit
descriptions, please use the diagrams in chapter 6 and 7.
Where necessary, you will find a separate drawing for
clarification.
9.1 General
The FM242 is the 3rd generation Philips plasma monitors.
Related to the FM242 it is a cost down product. A lower
specified pdp is used here (SDI-pdp), however performing still
very acceptable. In comparison to the FTV1.9DE, it has:
• The power supply has been exchanged by another supply-
panel
• A new SCAVIO panel, which takes over the tasks of the
former AVC and LIMESCO panels.
• A new class-D audio amplifier,
• A VGA-resolution pdp. It is possible to use this product as
stand-alone monitor or, in combination with the so-called
F21R Receiver box, for TV applications.
There are two configurations:
•
Basic: which has one video input (VGA1) and one video
output (VGA2). The VGA2 video output is directly
connected to the VGA1 video input, without any
processing. The audio output of VGA2 is also directly
connected to the VGA1 audio input.
• Enhanced: which has six video inputs (VGA1, VGA2, DVI-
D, CVBS, YC and HD) and six corresponding audio inputs.
These inputs are internally converted to the appropriate
signals. The VGA2 connection is here bi-directional (Flex-
VGA).
Note: In all descriptions below, the Enhanced version of the
FM242 is discussed. When there are important differences
between the Basic and Enhanced versions, this is mentioned.
Figure 9-1 Control and Data Path
4052
1
Audio Processing
Audio Amplifier
RC / LED / Switch Panel
3D Comb*
PW
PixelWorks
PW164_10R or 10RK
Video Scaling
Co-processor
OTC
Main Processor
SAA5801H/xx
LVDS
Encoder
DS90C385
Flash
ROM
2Mbyte
NVM
32Kbit
ADC +
TMDS
Decoder
AD9887
Y/G
Pb/B
Pr/R
H,V
Sync
decoder
NVM
DDC
NVM
DDC
EPLD
EP1K30QC
PDP
Digital Video
Decoder
SAA7118
De-interlacer
SDA9400
MSP Audio Processor
MSP3415G
Audio Delay
32KSRAM CY7C1399
Flash ROM
2Mbyte
D
V
I
DVI-D
In
Display
Control
AC i/
p
CVBS
YC
NVM
DDC
Light
Sensor
Sub-D
9 P
DRAM
2Mbyte
SRAM
128kbyte
ADC Exp
PCF8591
IO Exp-
SC1
PCF8574
HP
Amp
LP
Amp
Tweeter
Low/Mid
Per channel
RS
232
C
V
G
A
2
ST
RS 232
Driver
Red
LED
Green
LED
NVM
32Kbit
I 2
C_
Bu
s
-2
I 2 C_Bus4
(sw bus to NVM)
I
2
C_Bu s5
(sw bus to N VM)
PW/OTC
Switch
4052
UART
OTC
Y/H/V
RGB+HV
TMDS
YUV
Digital
RGB+HV
RGB+HV
Digital
RGB+HV
RGB+HV
I 2 S I 2 S
YP
b
P
r
I
2
C_Bu s-1
I 2 C_Bu s-3
UART (Ebox)
3v3Stby/
5vStdby
1fH YUV
UART
PW
ON/OFF switch
(see description)
L/R CVBS
L/R VGA in
L/R DVI
L/R HD
L/R Flex VGA
(only output in
Basic config.)
Audio Switch
TEA6422D
L/R YC
Output
Switch
Video +
Sync
switching
RGB+HV
RGB+HV
RGB
RC5 to E-box
PSU
AC/DC, DC/DC converters
Audio supply, 5V,8V6, 3v3, Vs,Va
Protection
3v3,5v Standby PSU
Fan driver
Vs,Va,Vcc Vsago
H,V
VGA1
Switch
Sync.
Interrupt
Gener.
H and/or V
from VGA1
SAM
,
SD
M
,
R
S
232c
Fan Control PWM
MPU
PROM
for EPLD
Loop thru of RGB
and H,V signals
from VGA1 only
Serial Digital RGB with
clock and Sync information
UART
Interrupt
gener.
H,V
In
te
rr
u
p
t
I 2 S
AV3
AV1
AV2
RC
out
YPbPr
RGB
Contro l
Video
PSU
Mute
Mute
audio
enable
service
int. pins
RS232
Interrupt
gener.
RS232C/
TTL
RS232C
activity int.
CPUgo =>
PDP go =>
<= IRQ_PDP
POWER_DOWN =>
select
sw
it
ch
-
VG
A
1
Power ON
Reset
Clock
generator
+
5
V_
Stb
y
_
S
w
+9V_STBY
+9V_STBY
+9V_STBY
PW
Re
s
e
t
IO expander
PS
2x
FAN
2x
FAN
U
PCF8574AT
VGA2
VGA1
RS232-C
M
SP Re
s
e
t
video
control
Power OK, 5V test,
8V6 test
IN
OUT
V
G
A
*
CL 26532038_006.eps
010502
IR RXr
(RC in)
R
ICONN
S232C
! All Functional block s shaded grey are required for
the"Basic Configuration".
The remainder is required for the "Enhanced Configuration".
*
are optional or prepared