DOWNLOAD Sharp PN-G655RE (serv.man3) Service Manual ↓ Size: 8.27 MB | Pages: 86 in PDF or view online for FREE

Model
PN-G655RE (serv.man3)
Pages
86
Size
8.27 MB
Type
PDF
Document
Service Manual
Brand
Device
Monitor / Complete
File
pn-g655re-sm3.pdf
Date
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Sharp PN-G655RE (serv.man3) Service Manual ▷ View online

PN-G655RE
TROUBLESHOOTING
5 – 3
7. HARDWARE CHECK NG
1
2
4 3
6
8
5 7
Major sympton when NG
LED flashing pattern
Countermeasures
1 LCD 12V
The backlight does not light up.
The red LED blinks.
Refer to 7-1.
2 VIDEO 5V
Abnormal colors on the display.
3 AMP 3.3V
Sound is not reproduced.
4 AMP 9V
5 BACKLIGHT
The backlight does not light up.
6 THERMAL1
Automatic power OFF.
red 
3 green 3 red 3 green 3 ...
Refer to 7-2.
7 THERMAL2
8 THERMAL3
7-1. The red LED blinks
Abnormality
No abnormality
Replace the abnormal part.
Replace the abnormal part.
No NG
Abnormality
Abnormality
NG
Is there any abnormality in the NG position? 
Check the power for abnormality
. 
 
Check the fuse for breakage. 
Check the cable connection.  
Check the key and the related parts for any abnormality. 
Check the connection cable.  
Check the key PWB.
Check the I/F PWB 1 for any abnormality. 
Check the connection cable.  
Check the fuse for breakage.  
Check the PWB.
To locate the abnormal position, perform a certain 
operation or use a certain RS232C command to display 
the diagnosis result.
7-2. The LED lights up in order of red 
3 green 3 red 3 green.
Abnormality
No abnormality
Replace the abnormal part.
Replace the abnormal part.
Replace the abnormal part.
No NG
Abnormality
Abnormality
NG
Is there any abnormality in the NG position?
Is the unit properly installed? 
Check the key and the related parts for any abnormality. 
Check the connection cable.  
Check the key PWB.
Check the I/F PWB 1 for any abnormality. 
Check the connection cable.  
Check the fuse for breakage.  
Check the PWB.
To locate the abnormal position, perform a certain 
operation or use a certain RS232C command to display 
the diagnosis result.
PN-G655RE
HARDWARE DESCRIPTIONS
6 – 1
CHAPTER 6. HARDWARE DESCRIPTIONS
1. CIRCUIT DESCRIPTIONS
1-1. POWER UNIT
The circuit is composed of the power unit 
(RDENC1010MPPZ
+
RDENC1011MPPA) and the filter block 
(RUITK1010MPPZ).  
■ General specifications
2. LCD UNIT
■ Color TFT LCD module LK645D3LZ2T
This module is an active matrix, transmission-type, LCD display which
uses the amorphous silicon thin-film transistor (TFT: Thin-Film Transis-
tor) and enables color display.
The circuit is composed of the color TFT - LCD panel, the driver IC, the
control circuit, the power circuit, the inverter circuit, the backlight unit,
etc. As an interface, the LVDS (Low Voltage Differential Signaling) is
used to supply 
+
12V DC power and 
+
24V backlight power, allowing
image and text display in 16,777,216 colors on a panel of 1920 
×
 RGB
×
 1080 dots. This module also includes the DC/AC inverter which is
used to drive the lamp. 
The backlight is of direct under system and is composed of 36 CCFT’s
(Cold Cathode Fluorescent Tubes). 
•  Screen size
: 163.9 cm
•  Drive display area
: 1428.48 mm (H) 
×
 803.52 mm (V) 
•  Max. brightness
: 450 cd/m2 (Typ.)
•  Backlight life
: 60,000 hour
*
* When the lamp is lighted continuously at Ta=25°C and the center
brightness reaches 50% of the initial value, it is judged as the life is
expired. 
3. IF PWB 1
Temperature sensor/Optical sensor/Remote control/Switch/LED/
Inverter/LCD display is controlled.
3-1. INPUT AND OUTPUT SIGNAL
3-2. MAIN COMPLETE PARTS AND FUNCTION
Input rated
: AC100V-240V  50Hz/60Hz
Power
consumption
: 560W max. (at 100Vac, 60Hz, rated load)
Output STB 5V
: 5.1V 1.5A
Output 5V
: 5.1V 1.0A
Output 12V
: 12.2V 4.0A
Output 24V
: 24.3V 11.0A
SPECIFICATIONS
USE CONNECTOR
PC signal
Analog input terminal
(VESA compliance)
D-sub 15 pin
BNC 
×
 5
Digital input terminal
(DVI compliance)
DVI-D terminal
Digital output terminal 
(Daisy chain type)
DVI-D terminal
RS-232C input terminal
D-sub 9 pin
AV signal
Digital input terminal
DVI-D terminal
Composite video input
terminal
BNC 
×
 1
Component video input
terminal
BNC 
×
 3
Monitor
control
RS-232C output terminal
D-sub 9 pin
REFERENCE
PARTS NAME
PARTS FUNCTION
IC101
BR24L02F
Analog PC type DDC
·
EEPROM
IC107
LT6554 3ch 
video 
buffer
IC201
TFP503
DVI-D type TMDS receiver
IC204
BR24L02F
Digital PC type DDC
·
ROM1
IC205
BR24L02F
Digital PC type DDC
·
ROM2
IC301
TFP513
DVI-D type TMDS transceiver
IC302
SM5301CS
Video buffer with the built-in LPF
supporting the video signal band
IC401
FLI8638
Scaler IC with built-in micropro-
cessor
IC402, 404
BR24L32FV
32kbit EEPROM
(The set data are saved.)
IC403
DS1374U-33
+
RTC with the watchdog function
supporting I2C
IC406
PCF8575
16bit I/O expander supporting
I2C
IC501, 502
MT46V16M16P-5B
128Mbit DDR SDRAM
IC503
S29AL032D70 
32Mbit flash memory
(program are saved.)
IC701
MAX3243
RS232C type transceiver/
receiver
IC702
TL16C2552
Dual UART with built-in FIFO
(used for RS232C communica-
tion)
PN-G655RE
HARDWARE DESCRIPTIONS
6 – 2
4. IF PWB 2
The sound PWB is controlled.
4-1. INPUT AND OUTPUT SIGNAL
4-2. MAIN COMPLETE PARTS AND FUNCTION
5. TEMPERATURE SENSOR PWB
Watches the temperature of the unit by the temperature watch function IC.
6. OPTICAL SENSOR PWB
Watches lighting of the backlight by the light receiving element IC.
7. KEY PWB
Provided with the remote control light receiving section, the switch, and
the LED module. 
SPECIFICATIONS
USE CONNECTOR
Audio
signal
PC audio input terminal
φ
 3.5 jack
AV audio input terminal
RCA 
×
 2
Audio output terminal
RCA 
×
 2
Speaker
output
Supporting 6 
Ω speaker
Speaker terminal
REFERENCE
PARTS NAME
PARTS FUNCTION
IC1
MSP3440G
Sound processor
IC2
NJU26901
Digital audio type delay IC
IC3
YDA138
Audio amp
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