Sharp LC-32SA1E (serv.man2) Service Manual ▷ View online
LC-26SA1E/RU, LC-32SA1E/RU
6 – 22
<26/32”> Backlight failure to light up
Do all the fluorescent tubes light up?
NO
Check the individual fluorescent
tubes for light-up failure
tubes for light-up failure
YES
Replace any defective fluorescent
tube (s) with new one (s).
tube (s) with new one (s).
YES
Is the power supplied to the inverter
unit?
unit?
NO
Check the connection between
power unit and inverter unit.
power unit and inverter unit.
YES
Is the fuse in the inverter unit circuit
functioning?
functioning?
NO
Replace the blown-out fuse on the
inverter unit.
Turn on the power again.
If the fuse gets blown out again,
check the short-circuited
inverter unit.
Turn on the power again.
If the fuse gets blown out again,
check the short-circuited
YES
Check drive trans and their peripheral
circuits as well as drive FET and their
peripheral circuits.
circuits as well as drive FET and their
peripheral circuits.
YES
Is the VCC power supplied to the
inverter control IC on the inverter
unit?
inverter control IC on the inverter
unit?
NO
Check the circuit connected with the
VCC terminal on the inverter control
IC.
VCC terminal on the inverter control
IC.
YES
Are there control signals (INV-ON,
INV-BRT, PWM-SEL) at CN3 on the
inverter unit?
INV-BRT, PWM-SEL) at CN3 on the
inverter unit?
NO
Are there the INV-ON and INV-BRT
signals at P704 on the power unit,
and the (INV-ON and INV-BRT)
signals at SC1702 on the main PWB?
signals at P704 on the power unit,
and the (INV-ON and INV-BRT)
signals at SC1702 on the main PWB?
NO
Check pins (97) and (91) of IC1710
(main PWB).
(main PWB).
YES
Is the specified control signal inputted
at INV-CTL-IC on the inverter unit?
at INV-CTL-IC on the inverter unit?
NO
Check the line between CN3 and
INV-CTL-IC.
INV-CTL-IC.
YES
Are the DRIVE-FET at the primary
side of DRIVE-TRANS functioning?
side of DRIVE-TRANS functioning?
NO
Replace INV-CTL-IC or check its
peripheral circuits.
peripheral circuits.
YES
Is the secondary circuit of DRIVE-
TRANS functioning?
TRANS functioning?
NO
Replace the DRIVE-TRANS for
the fluorescent tubes, or check their
peripheral circuits.
the fluorescent tubes, or check their
peripheral circuits.
LC-26SA1E/RU, LC-32SA1E/RU
6 – 23
LCD failure
Does a single or several vertical
stripes appear on the LCD screen?
stripes appear on the LCD screen?
Replace the LCD panel.
LCD failure
Does a single or several horizontal
stripes appear on the LCD screen?
stripes appear on the LCD screen?
Replace the LCD panel.
LCD failure
Do luminescent or black dots appear
on the screen?
on the screen?
Replace the LCD panel.
LCD failure
Is the on-screen image rippling or
distorted?
distorted?
Replace the LCD panel.
LCD failure
The backlight functions.
Does not the image come out in the
LCD screen (screen black)?
Does not the image come out in the
LCD screen (screen black)?
Replace the LCD control unit
LCD failure
Does the entire LCD screen look
whitish all over?
whitish all over?
Replace the LCD control unit
LCD failure
Does the QS drive function?
Replace the LCD control unit
LCD failure
Are there data bit drop-outs?
(No solution even when turning on
and off the QS drive)
(No solution even when turning on
and off the QS drive)
Replace the LCD control unit
LCD failure
Is the gamma correction as
specified?
specified?
Replace the LCD control unit
LC-26SA1E/RU, LC-32SA1E/RU
7 – 1
LC-26SA1E
Service Manual
CHAPTER 7.
MAJOR IC INFORMATIONS
[1] MAJOR IC INFORMATIONS
1. General ICs Information
Ref No.
Name
Part Code
Description
Drawing
Name
KD890FM (MAIN UNIT)
IC1905 1
IC1905 1
HDMI-Receiver
VHISII9021+-1Q
The SiI9021 is a second generation panel Link Cinema receiver that is compat-
ible with the HDMI 1.1 (High Definition Multimedia interface) specification.
The SiI9021 is capable of receiving and outputting two channel digital audio at
up to 192KHz - an excellent solution for Digital TVs.
The feature of this IC is as follows.
1) Digital video interface supports video processors:
2) Analog RGB and YPbPr output: 10-bit DAC.
3) Digital audio interface supports high-end audio systems:
ible with the HDMI 1.1 (High Definition Multimedia interface) specification.
The SiI9021 is capable of receiving and outputting two channel digital audio at
up to 192KHz - an excellent solution for Digital TVs.
The feature of this IC is as follows.
1) Digital video interface supports video processors:
2) Analog RGB and YPbPr output: 10-bit DAC.
3) Digital audio interface supports high-end audio systems:
M1
IC2701 2
4CH-
MULTIPLEXER
MULTIPLEXER
VHITVHC153T-1Y
This IC is a super high speed CMOS 4-channel multiplexer using the CMOS
technology and incorporates 2 circuits.
The input consists of 2 addresses A, B, 4 channel inputs C0-C3 and strobe
input G, and the signal of the channel selected by the address input sent as the
output Y.
The strobe input is used for prohibition of data output.
That means, when G input is “H” the output becomes “L” unconditionally.
In this model, this IC operates the switch of H/V-SYNC on each signal condi-
tion.
technology and incorporates 2 circuits.
The input consists of 2 addresses A, B, 4 channel inputs C0-C3 and strobe
input G, and the signal of the channel selected by the address input sent as the
output Y.
The strobe input is used for prohibition of data output.
That means, when G input is “H” the output becomes “L” unconditionally.
In this model, this IC operates the switch of H/V-SYNC on each signal condi-
tion.
M2
IC3002 3
VIDEO
PROCESSOR
PROCESSOR
RH-IXB624WJN1Q The VCT 6wxyP family is based on functional blocks contained and approved
in existing products like VCT49xxl, VSP 94x5B, and DPS 94xxA.
That is, the following 6 major functions are included:
1) Audio Processing
2) Video Processing
3) Motion Adaptive Upconversion
4) Scaling, Display Processing and FPD
5) Unified memory for Audio, Video and Text Control, 3D Combfilter PC
That is, the following 6 major functions are included:
1) Audio Processing
2) Video Processing
3) Motion Adaptive Upconversion
4) Scaling, Display Processing and FPD
5) Unified memory for Audio, Video and Text Control, 3D Combfilter PC
Connectivity
6) Controlling, OSD and Text
M3
IC3003 3
Microcontroller
RH-IXB664WJZZY
This IC is based on LCD Driver and nano Watt Technology and is RISC micro-
processor to control peripheral functions necessary for the system configura-
tion.
In this equipment, the R/C LED on the AVC side and system on the display side
are controlled.
processor to control peripheral functions necessary for the system configura-
tion.
In this equipment, the R/C LED on the AVC side and system on the display side
are controlled.
M3
IC2301 5
RS232C
Transmitters/
Receivers
Transmitters/
Receivers
VHIISL83220-1Y
This IC is a line driver receiver in conformity with EIA/TIA-232-E (former RS-
232C) standard.
By connecting a PC, the system can be controlled externally.
232C) standard.
By connecting a PC, the system can be controlled externally.
M5
IC1710 6
CPLD
RH-IXB823WJZZQ This IC is a CPLD of Altera and use CMOS EEPROM cells to implement logic
functions with 64 Macrocells. This device controls ON/OFF power supply and
signals for inverter unit.
signals for inverter unit.
M6
IC1706 6
Stepdown
Converter
Converter
VHIMP1410ES-1Y
The MP1410 is a monolithic step down switch mode regulator with a built in
internal power MOSFET.
In this model, it is assumed 1.8V DC/DC-CONVERTER and is used.
internal power MOSFET.
In this model, it is assumed 1.8V DC/DC-CONVERTER and is used.
M6
IC3001
E2PROM
VHIBR24L64F-1Y
The BR24L64F is a 2-wire (I2C bus type) serial EEPROM that is electrically
programmable.
This IC saves adjustment values of the adjustment process mode, etc.
The data is given out by commands from the main microprocessor.
programmable.
This IC saves adjustment values of the adjustment process mode, etc.
The data is given out by commands from the main microprocessor.
IC1901
E2PROM
VHI24LC2BIN-1Y
This IC is a 2-wire (I2C bus type) serial EEPROM this is electrically
programmable.
This EEPROM chip stores EDID data of the input for HDMI.
This data is controlled by the I2C signal.
programmable.
This EEPROM chip stores EDID data of the input for HDMI.
This data is controlled by the I2C signal.
IC2303
E2PROM
VHIBR24C21F-1Y
This IC is a 2-wire (I2C bus type) serial EEPROM this is electrically
programmable.
This EEPROM chip stores EDID data of the input for PC.
This data is controlled by the I2C signal.
programmable.
This EEPROM chip stores EDID data of the input for PC.
This data is controlled by the I2C signal.
KD604FM (AV UNIT)
IC301
IC302
IC301
IC302
Sound Amp
VHITDA8931T-1Y
The TDA8931 is a switching power stage for high efficiency class-D audio
power amplifier systems.
With this amplifier a compact 1x 20 W closed loop self-oscillating digital ampli-
fier system can be built.
In this model, Audio amplifier is 10watt.
power amplifier systems.
With this amplifier a compact 1x 20 W closed loop self-oscillating digital ampli-
fier system can be built.
In this model, Audio amplifier is 10watt.
AV1
LC-26SA1E/RU, LC-32SA1E/RU
7 – 2
Ref No.
Name
Part Code
Description
Drawing
Name
KD605FM (POWER UNIT)
IC705
IC705
Switching
Regulator
Regulator
VHIMR4020++-1
This IC is a power supply for the switching regulator on the primary side.
Overvoltage/overcurrent protection circuit, other protection circuits and control
circuits are built in this IC.
Overvoltage/overcurrent protection circuit, other protection circuits and control
circuits are built in this IC.
P1
IC704
Switching
Regulator
Regulator
VHIMR4030++-1
This IC is a power supply for the switching regulator on the primary side.
Overvoltage/overcurrent protection circuit, other protection circuits and control
circuits are built in this IC.
Overvoltage/overcurrent protection circuit, other protection circuits and control
circuits are built in this IC.
P1
KD608FM (TUNER UNIT)
IC201
IC201
IF-
Demodurator/
PLL
Demodurator/
PLL
VHITDA9886+-1Y
The TDA9886 is an alignment-free multistandard (PAL, SECAM and NTSC)
vision and sound IF signal PLL demodulator for positive and negative modula-
tion in cluding sound AM and FM processing.
vision and sound IF signal PLL demodulator for positive and negative modula-
tion in cluding sound AM and FM processing.
TUNER
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