Philips 32PFL5405H/05 Service Manual page 56

EN 56 7. Q552.1E LA
6
×
6 5
×
L
E 6
L
D
E
D
E
D
36 30 24
Figure 7-17 LED grouping per board
The communication between PNX85500, Complex
Programmable Logic Device (CPLD) and the Ambilight module
uses the SPI protocol; refer to figure
protocol outside LED board. Between the CPLD and the LED
driver, as "extra" line is mentioned:
• Non-SPI signals that are required for the LED driver
• Temperature sensor line.
S P I
P N X
Figure 7-18 Communication protocol outside LED board
Refer to figure for an overview of the communication inside the
LED board.
S P I
B uffer
Tem p
sensor
Te m p
Figure 7-19 Communication protocol inside LED board
The buffer is built around item no. 7B20 (diagram AL1A) and
regenerates the clock signals. Refer to figure
buffer.
2010-Feb-19
Circuit Descriptions
3
×
4 2
5
× L ×
6 6
E
3
L D L
×
E
6
D
L
E
D
18 15 12
18770_210_100126.eps
7-18 Communication
S P I + e x tra
C P LD
18770_211_100126.eps
E x tra
S P I S P I
LE D
D river
E E P R O M
S P I
S P I
18770_213_100126.eps
7-20 Ambilight
PWM-CLOCK
4
+
SPI-CLOCK
5
L
E
D
9
The temperature sensor is built around item no. 7B30 (diagram
100126
AL1A) and indicates overtemperature of the board. Refer to
figure
100126
The EEPROM (item no. 7B07; diagram AL1A) contains
alignment information about the mounted LEDs and is
programmed during the alignment process in production. Refer
to figure
SPI-DATA-IN-BUF
SPI-CLOCK-BUF
SPI-CS
DATA-SWITCH
SPI-DATA-RETURN
100219
The LED driver is built around item no. 7B26 (diagram AL1A)
and controls the LEDs. Refer to figure
back to
div. table
+3V3
7B20-1
74LVC2G17
3B01-2
2 7 1
100R
7B20-2
74LVC2G17
+3V3
3B01-1
1 8 3
100R
Figure 7-20 Ambilight buffer
7-21 Temperature sensor.
+3V3 +3V3
7B30
FB40
1
3
FB41
Figure 7-21 Temperature sensor
7-22 EEPROM.
+3V3
7B07
M95010-WDW6
+3V3 VCC
Φ
5
D
7B06
(64K)
74LVC1G32GW 6
C
1
4 1
S
2
+3V3 3B02-1
1 8 3
W
10K
GND
Figure 7-22 EEPROM
3B30-1
PWM-CLOCK-BUF
6 1 8
220R
3B30-4
4 4 5 SPI-CLOCK-BUF
220R
18770_214_100126.eps
100126
3B34
100K RES
+3V3
4 TEMP-SENSOR
LMV331IDCK
18770_215_100126.eps
100126
2
Q
3B02-2
7
+3V3
HOLD
7 2
10K
18770_216_100126.eps
100126
7-23 LED driver.