Philips 40PFL7664H/12 Service Manual page 40

EN 40 7. Q548.1E LB
7.2 Power Supply
All power supplies described below are a "black box" for
Service. When defective, a new board must be ordered and the
defective one must be returned, unless the main fuse of the
board is broken. Always replace a defective fuse with one with
the correct specifications! This part is available in the regular
market.
Consult the Service Spare Parts website for the order codes of
the boards.
7.2.1 Specifications
Sets in this chassis use the "FSP202-5F01" dual-Power Supply
Unit from FSP Technology Inc. In this Service Manual, no
detailed information is available for design protection reasons.
The display used in the sets uses LEDs as backlight. The
drivers for these LEDS are integrated on the PSUs.
7.2.2 Application Block Diagram
PSU 1
1350
EMI-filter,
PFC ,
(power fact. corr.)
3V3standby
LED-driver part I
1351
1316
1308
Connector
to backlight
Figure 7-3 Block Diagram PSU
7.2.3 Control
The Power Supply Unit is controlled via a digital input signal
consisting of the "STANDBY", "DIM", "BLON" and "BOOST"
lines.
When the LED driver outputs are activated, the PSU will
generate an INVOK signal from LOW to HIGH. When the LED
driver outputs are de-activated, the generated INVOK signal is
LOW.
The definitions of LOW and HIGH are:
• LOW: < 0.4 V
• HIGH: > 2.4 V.
2009-Dec-18
Circuit Descriptions
PSU 2
1M99 1M83
1M95 1M84
1350
1M59
Main converter
Interfacing
12Vssb
between
24Vsound/bolt-on
the 2 PWBs
18V_bolt-on
LED-driver part II
1351
1319
Connector
to backlight
18670_201_090908.eps
090908
LED-Drive
+Vbolt-on
Figure 7-4 Rise-and-fall sequence PSU
7.2.4 Connector Pin Assignments
1308 1M95
Pin no. CN1 CN4
1 N 3V3stdby
2 L Standby
3 - GND1
4 - GND1
5 - GND1
6 - +12V
7 - +12V
8 - +12V
9 - +Vsnd
10 - GND_
SND
11 - n.c.
12 - -
13 - -
14 - -
1351
Pin no. CN-S-1(-A)
1 GND
2 3V3s
3 BLON
4 STB
5 PWM-D
6 Vref
7 SCP
8 B-V
9 15V
10 GND
11 GND
12 37V
13 37V
18670_202_090908.eps
Connector
1M99 1M59 1M83
CN5 CN6 CN7
+12V AL_I2C_ AL_I2C_ AL_I2C_
SCL SCL
+12V GND GND
GND1 AL_I2C_ AL_I2C_ AL_I2C_
SDA SDA
GND1 n.c. GND
BL_ON_ n.c. GND
OFF
DIM +3.3V +3.3V
Boost GND GND
n.c. - n.c.
INVOK - n.c.
n.c. - n.c.
n.c. - Vbolt-on2 Vbolt-on2
n.c. - GND1
- - Vbolt-on1 Vbolt-on1
- - GND1
Connector
1350 1316 1319
CN-P-1(-A) CN2 CN3
Vcc CC1A CA2
HV- CC2A CA2
n.c. CC3A CC8B
HV+ CC4A CC7B
- CC5A CC6B
- CC6A CC5B
- CC7A CC4B
- CC8A CC3B
- CA1 CC2B
- CA1 CC1B
- -
- -
- -
090908
1M84
CN8
SCL
GND
SDA
+3.3V
GND
+3.3V
GND
n.c.
n.c.
n.c.
GND1
GND1
-
-
-