Circuit Descriptions
EN 40 Q548.1E LB7.
2009-Dec-18
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
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.
Figure 7-4 Rise-and-fall sequence PSU
7.2.4 Connector Pin Assignments
18670_201_090908.eps
090908
1308
1M59
Connector
to backlight
1M84
1M83
EMI-filter,
PFC
(power fact. corr.),
3V3standby
LED-driver part I
Main converter
12Vssb
24Vsound/bolt-on
18V_bolt-on
LED-driver part II
Interfacing
between
the 2 PWBs
1M95
1M99
PSU 1
PSU 2
Connector
to backlight
1316
1319
1351
1350
1351
1350
Pin no.
Connector
1308
CN1
1M95
CN4
1M99
CN5
1M59
CN6
1M83
CN7
1M84
CN8
1 N 3V3stdby +12V AL_I2C_
SCL
AL_I2C_
SCL
AL_I2C_
SCL
2 L Standby +12V GND GND GND
3 - GND1 GND1 AL_I2C_
SDA
AL_I2C_
SDA
AL_I2C_
SDA
4 - GND1 GND1 n.c. GND +3.3V
5 - GND1 BL_ON_
OFF
n.c. GND GND
6 - +12V DIM +3.3V +3.3V +3.3V
7 - +12V Boost GND GND GND
8 - +12V n.c. - n.c. n.c.
9 - +Vsnd INVOK - n.c. n.c.
10 - GND_
SND
n.c. - n.c. n.c.
11 - n.c. n.c. - Vbolt-on2 Vbolt-on2
12 - - n.c. - GND1 GND1
13 - - - - Vbolt-on1 Vbolt-on1
14 - - - - GND1 GND1
Pin no.
Connector
1351
CN-S-1(-A)
1350
CN-P-1(-A)
1316
CN2
1319
CN3
1 GND Vcc CC1A CA2
2 3V3s HV- CC2A CA2
3 BLON n.c. CC3A CC8B
4 STB HV+ CC4A CC7B
5 PWM-D - CC5A CC6B
6 Vref - CC6A CC5B
7 SCP - CC7A CC4B
8 B-V - CC8A CC3B
9 15V - CA1 CC2B
10 GND - CA1 CC1B
11GND---
12 37V - - -
13 37V - - -
LED-Drive
+Vbolt-on
18670_202_090908.eps
090908
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