Sony SDM-HX93 User manual

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Model Description
MODEL BRAND
Printing Specification
1. Trim Size (Format) : 215mm x 280 mm
2. Printing Colors
•Cover : Gray
•Inside : Blac
3. Stock (Paper)
•Cover : Uncoated paper 150 g/
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•Inside : Uncoated paper 100 g/
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4. Printing Method :
5. Bindery : Saddle stitch
6. Language : English
7. Number of pages : 39(Including blank 2pages)
Part No.
1.
2.
User’s Guide Specification
User’s Guide Specification
Changes
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 CHANGE NO. CHANGE CONTENTS
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LHX73L/LHX93L
AUEUB/AFEUB
SONY 3828TSO059L
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(1) Origin Notification
* LGEDI : Printed in Indonesia * LGEWA : Printed in U.K.
* LGESP : Printed in Brazil * LGEMX : Printed in Mexico
* LGENT : Printed in China * LGEIL : Printed in India
8
Special Instructions3.
Product Name SDM-HX73, SDM-HX93

Pagination sheet
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 
Front
Cover
Front cover
inside
2
English
3
English
4
English
5
English
…….
English
…..
English
36
English
37
Blank page
(Blank)
Rear Cover
Inside
(Blank)
Rear
Cover

MENU
OK
INPUT
COLOR MONITOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS NO. : CL-53
MODEL: SDM-HX73, SDM-HX93

1. LCD CHARACTERISTICS
Type : TFT Color LCD Module
Size : 17 inch(SDM-HX73)
19 inch(SDM-HX93)
Pixel Pitch :
0.264 (H) x 0.264 (V)
(SDM-HX73)
0.294 (H) x 0.294 (V) (SDM-HX93)
Color Depth : 262K colors(SDM-HX73)
16.7M colors(SDM-HX93)
Electrical Interface : LVDS
Surface Treatment : Haze 25%, Hard-coating(2H)
Operating Mode : Normally White
Backlight Unit : 4 CCFL (SDM-HX73)
6 CCFL (SDM-HX93)
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio
≥
10
(SDM-HX73)
Left : -60° min., -70°(Typ) Right : +60° min., +70°(Typ)
Top :+60° min., +70°(Typ) Bottom : -60°min., -70°(Typ)
(SDM-HX93)
Left : -85° min. Right : +85° min.
Top :+85° min. Bottom : -85°min.
2-2. Luminance : 320(min), 370(Typ) (SDM-HX73)
: 310(min), 360(Typ) (SDM-HX93)
2-3. Contrast Ratio : 250(min), 450(Typ) (SDM-HX73)
: 400(min), 600(Typ) (SDM-HX93)
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal
• Type : Separate Sync,
Composite Sync, Digital
3-2. Video Input Signal
1) Type : R, G, B Analog
2) Voltage Level : 0~0.71 V
a) Color 0, 0 : 0 Vp-p
b) Color 7, 0 : 0.467 Vp-p
c) Color 15, 0 : 0.714 Vp-p
3) Input Impedance : 75 Ω
3-3. Operating Frequency
Horizontal : 28 ~ 80kHz (Digital: ~64kHz)
Vertical : 48 ~ 75Hz (Digital: 60Hz)
4
. Max. Resolution
Analog : 1280 x 1024 / 75Hz
Digital : 1280 x 1024 / 60Hz
5. POWER SUPPLY
5-1. Power
: AC 100~240V, 50/60Hz , 1.0A
5-2. Power Consumption
6. ENVIRONMENT
6-1. Operating Temperature: 0°C~50°C
6-2. Relative Humidity : 5%~95% (Non-condensing)
6-3. MTBF : 50,000 Hours(Min)
7. DIMENSIONS (with TILT/SWIVEL)
(SDM-HX73)
Width : 413.8 mm (16.3'')
Depth : 232.0 mm (9.13'')
Height : 418.3 mm (16.47'')
(SDM-HX93)
Width : 466.5 mm (18.37'')
Depth : 265.0 mm (10.43'')
Height : 468.0 mm (18.43'')
8. WEIGHT (with TILT/SWIVEL)
(SDM-HX73)
Net. Weight : 6.5kg (14.33 lbs)
Gross Weight : 9.0kg (19.84 lbs)
(SDM-HX93)
Net. Weight : 8.5 kg (18.74 lbs)
Gross Weight : 11.5kg (25.36 lbs)
CONTENTS
SPECIFICATIONS
- 2 -
SPECIFICATIONS ................................................... 2
PRECAUTIONS ....................................................... 4
TIMING CHART ....................................................... 5
OPERATING INSTRUCTIONS ................................ 6
WIRING DIAGRAM ................................................. 8
BLOCK DIAGRAM ................................................... 9
DESCRIPTION OF BLOCK DIAGRAM...................10
ADJUSTMENT ...................................................... 12
TROUBLESHOOTING GUIDE .............................. 13
PRINTED CIRCUIT BOARD................................... 19
EXPLODED VIEW.................................................. 22
REPLACEMENT PARTS LIST .............................. 24
PIN CONFIGURATION .......................................... 29
SCHEMATIC DIAGRAM........................................ 30
MODE
POWER ON (NORMAL)
STAND-BY
SUSPEND
DPMS OFF
POWER S/W OFF
H/V SYNC
ON/ON
ON/ON
OFF/ON
ON/OFF
OFF/OFF
-
-
VIDEO
ACTIVE
ACTIVE
OFF
OFF
OFF
-
-
POWER CONSUMPTION
less than 50W(SDM-HX73)
less than 60W(SDM-HX93)
less than 1W
less than 1W
less than 1W
less then 1W(SDM-HX73) - AUO Module
less then 1W(SDM-HX93)
LED COLOR
GREEN
AMBER
AMBER
AMBER

- 3 -
Signal Connector Pin Assignment
Pin Signal (DVI-I)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
T. M. D. S. Data2-
T. M. D. S. Data2+
T. M. D. S. Data2/4 Shield
T. M. D. S. Data4-
T. M. D. S. Data4+
DDC Clock
DDC Data
Analog Vertical Sync.
T. M. D. S. Data1-
T. M. D. S. Data1+
T. M. D. S. Data1/3 Shield
T. M. D. S. Data3-
T. M. D. S. Data3+
+5V Power
Ground
(return for +5V,
H. Sync. and V. Sync.)
Pin Signal (DVI-I)
18
9
17 24
16 C1
C4
C3
C2
C5
16
17
18
19
20
21
22
23
24
C1
C2
C3
C4
C5
Hot Plug Detect
T. M. D. S. Data0-
T. M. D. S. Data0+
T. M. D. S. Data0/5 Shield
T. M. D. S. Data5-
T. M. D. S. Data5+
T. M. D. S. Clock Shield
T. M. D. S. Clock+
T. M. D. S. Clock-
Analog Red
Analog Green
Analog Blue
Analog H. Sync.
Analog Ground
T. M. D. S. (Transition Minimized Differential Signaling)
• DVI-D Connector (Digital/Analog)

PRECAUTION
- 4 -
WARNING FOR THE SAFETY-RELATED COMPONENT.
•There are some special components used in LCD
monitor that are important for safety. These parts are
marked on the schematic diagram and the
replacement parts list. It is essential that these critical
parts should be replaced with the manufacturer’s
specified parts to prevent electric shock, fire or other
hazard.
•Do not modify original design without obtaining written
permission from manufacturer or you will void the
original parts and labor guarantee.
TAKE CARE DURING HANDLING THE LCD MODULE
WITH BACKLIGHT UNIT.
•Must mount the module using mounting holes arranged
in four corners.
•Do not press on the panel, edge of the frame strongly
or electric shock as this will result in damage to the
screen.
•Do not scratch or press on the panel with any sharp
objects, such as pencil or pen as this may result in
damage to the panel.
•Protect the module from the ESD as it may damage the
electronic circuit (C-MOS).
•Make certain that treatment person’s body are
grounded through wrist band.
•Do not leave the module in high temperature and in
areas of high humidity for a long time.
•The module not be exposed to the direct sunlight.
•Avoid contact with water as it may a short circuit within
the module.
•If the surface of panel become dirty, please wipe it off
with a softmaterial. (Cleaning with a dirty or rough cloth
may damage the panel.)
WARNING
BE CAREFUL ELECTRIC SHOCK !
•If you want to replace with the new backlight (CCFL) or
inverter circuit, must disconnect the AC adapter
because high voltage appears at inverter circuit about
650Vrms.
•Handle with care wires or connectors of the inverter
circuit. If the wires are pressed cause short and may
burn or take fire.
TIMING CHART
VIDEO
SYNC
B
D
CFE
A
CAUTION
Please use only a plastic screwdriver to protect yourself
from shock hazard during service operation.

- 5 -
Mode H/V
Sort
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
720x400
70Hz
H–35.00 864 640 224 64 96 64
V–66.667Hz 525 480 45 3 39 3
640x480
60Hz
H–37.50 840 640 200 64 120 16
V–75.0Hz 500 480 20 3 16 1
640x480
65Hz
H–31.500 900 720 180 108 54 18
V + 70.156Hz 449 400 49 3 34 12
640x480
75Hz
H–35.162 896 720 176 40 102 34
V–59.901Hz 587 480 107 2 93 12 720x480
60Hz
H +- 35.156 1024 800 224 72 128 24
V + 56.250Hz 625 600 25 2 22 1 800x600
56Hz
H + 37.879 1056 800 256 128 88 40
V + 60.317Hz 628 600 28 4 23 1 800x600
60Hz
H + 48.077 1040 800 240 120 64 56
V + 72.188Hz 666 600 66 6 23 37 800x600
72Hz
H + 46.875 1056 800 256 80 160 16
V + 75.0Hz 625 600 25 3 21 1 800x600
75Hz
H–49.727 1152 832 320 64 224 32
V–74.553Hz 667 624 43 3 37 3
832x624
(MAC16”)
75Hz
H–48.363 1344 1024 320 136 160 24
V–60.004Hz 806 768 38 6 29 3 1024x768
60Hz
H–56.476 1328 1024 304 136 144 24
V–70.069Hz 806 768 38 6 29 3 1024x768
70Hz
H + 60.023 1312 1024 288 96 176 16
V + 75.029Hz 800 768 32 3 28 1 1024x768
75Hz
H–60.241 1328 1024 304 96 176 32
V–74.927Hz 804 768 36 3 30 3
1024x768
(MAC19)
75Hz
H + 67.500 1600 1152 448 128 256 64
V + 75.000Hz 900 864 36 3 32 1 1152x864
75Hz
H–68.681 1456 1152 304 128 144 32
V–75.062Hz 915 870 45 3 39 3
1152x870
(MAC21)
75Hz
H–61.795 1504 1152 352 128 194 30
V–65.950Hz 937 900 37 4 31 2 1152x900
66Hz
H–71.732 1472 1152 320 96 208 16
V–76.068Hz 943 900 43 8 33 2 1152x900
75Hz
H + 31.216 1480 1170 310 129 144 37
V + 50.026Hz 624 584 40 3 34 3 1170x584
50Hz
H + 60.000 1800 1280 520 112 312 96
V + 60.000Hz 1000 960 40 3 36 1 1280x960
60Hz
H + 63.981 1688 1280 48 112 248 408
V + 60.020Hz 1066 1024 42 3 38 1 1280x1024
60Hz
H + 79.976 1688 1280 408 144 248 16
V + 75.025Hz 1066 1024 42 3 38 1 1280x1024
75Hz
Sync
Polarity Frequency
Dot
Clock
Back Porch
(F)
Blanking time
(B)
Resolution
28.350
25.175
30.240
31.500
31.505
36.000
40.000
50.000
49.500
57.285
65.000
75.000
78.750
80.000
108.000
100.000
92.940
105.590
46.200
108.000
108.000
135.000
<< Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >>
H–31.469 800 640 160 96 48 16
V–59.940Hz 525 480 45 2 33 10
Sync Duration
(D)
Front Porch
(C)
Video Active Time
(A)
Total Period
(E)

MENU
OK
INPUT
- 6 -
FRONT VIEW
REAR VIEW
SIDE VIEW
OPERATING INSTRUCTIONS
See Front Control Panel(P7) Head Phone Jack
Power Button
1. AC IN connector
This connector connects the power cord(suplied).
2. Audio input jack for INPUT1
This jack inputs audio signals when connected to the
audio output jack of a computer or other audio
epuipment connected to INPUT1.
3. HD15 input connector(anlog RGB) for INPUT1
This connector inputs analog RGB video signals
(0.700Vp-p, positive)and sync signals.
4. Audio input jack for INPUT2
This jack inputs audio signals when connected to the
audio output jack of a computer or other audio
epuipment connected to INPUT2.
5. HD15 input connector(anlog RGB) for INPUT2
This connector inputs analog RGB video signals
(0.700Vp-p, positive)and sync signals.
6. Audio input jack for INPUT3
This jack inputs audio signals when connected to the
audio output jack of a computer or other audio
epuipment connected to INPUT3.
7. DVI-D input connector(digital RGB) for INPUT3
This connectot inputs digital RGB video signals that
comply with DVI Rev.1.0.
SONY
INPUT 1 INPUT 2 INPUT 3
2 3 4 5 6 7
1

- 7 -
Front Control Panel
MENU
OK
INPUT
MENU
OK
INPUT
1
2
3
4
5
6
1. MENU Button
This button turns the menu screen on and off.
2. and (volume control) Buttons
These buttons are used to select the menu items and
make adjustments, and also display the “Volume”menu
to control the volume.
3. OK Button
This button activecfes the selected menu item and
adjustments made using the buttons(2).
4. INPUT Button
This button switches the video input signal between
INPUT1, INPUT2 and INPUT3 when two computers are
connected to the monitor.
5. Button
Use these buttons to choose or adjust items in the On Screen
Display.
• MOVIE: For viewing movies
• PC: For viewing PC
•GAME : For viewing
GAME
•AUTO
: For viewing AUTO
Establish brightness and light and darkness, color price in Menu
according to environmental condition.(MOVIE/PC/GAME).
6. (Power) switch and (power) indicator
This switch turns the monitor on when the power
indicator lights up in Green. To turn the monitor off,
press this switch again.
If the power indicator does not light up, press the MAIN
POWER switch.

CN3
CN4
CN2 J705
J706
J702
J605
- 8 -
WIRING DIAGRAM
Connector Ass’y P/N:
6631T20025C
Connector Ass’y P/N:
6631T10003E
Connector Ass’y P/N:
6631T11016W

- 9 -
ADC
Analog(R/G/B)
DVI(TMDS)
Inverter
Output
(4Lamp)
EEPROM
(EDID)
EEPROM
(System)
LVDS
Panel
Vcc
Regulator Regulator Regulator Process
IC
TDA7442 AP8202
SRS
WOW
IC
Amp
IC
L/R
VOL
KEY
DVI-D D-Sub X2
Filter
EEPROM*2
(EDID) MST9151A
3.3V
3.3V
2.5V
2.5V
9V
5V
5V
5V
MTV412PLCC
TPA3004D2
12V 12V
DVI Rx
LAMP Connector Audio in
LIPS
OSD
Scaling
Pre-Amp PLL
LVDS
Tx
+
BLOCK DIAGRAM

- 10 -
DESCRIPTION OF BLOCK DIAGRAM
1. Video Controller Part & Display Data Transmitter Part.
This part amplifies the level of video signal for the digital conversion and converts from the analog video signal to the
digital video signal using a pixel clock.
The pixel clock for each mode is generated by the PLL.
The range of the pixel clock is from 25MHz to 135MHz.
This part consists of the Scaler, LVDS Tx, TMDS Rx, Reset IC.
The Scaler gets the video signals which were converted analog to digital, interpolates input to 1280x1024 resolution
signal and outputs 8-bit R, G, B signal to transmitter.
Especially pre-amp / ADC / Video controller/ Transmitter are merged to one chip ‘MST9151A’by MST.
This part transmit digital signal from the Scaler to the receiver of module.
2. Power Part
This part consists of the one 3.3V and one 2.5 regulators to convert power which is provided 5V by LIPS Board.
In particular, 5V is provided for LCD Panel. There is also 12V which is for Audio power.
Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for IC in the main board.
3. System Controller (Microprocessor) Circuit
1) Microprocessor (U501) distinguishes polarity and frequency by calculating horizontal and vertical sync input from
signal source.
2) Microprocessor (U501) carries out power control by sending power-down trigger signal to each IC.
3) Microprocessor (U501) communicates with EEPROM (704), and MST9151A (U201) through IIC or 8 bit bus line. It
is enable to control and communicate each devices.
4) Microprocessor (U501) let User adjust screen by OSD function.
4. Audio Part
This circuit supports speaker output of 3W+3W(Right, Left).
There is processor IC for audio input selection and volume control.
The SRS WOW IC is AP8202 which support SRS WOW function. (Focus, Bass, SRS 3D).
The Main amp(TPA3004D2) IC amplifies input audio signal up to 3W.
The speaker unit is 16ohm impedance.

- 11 -
EMI
COMPONENTS
LINE
100 ~ 240V
INPUT RECTIFIER
AND FILTER ENERGY TRANSFER OUTPUT RECTIFIER AND FILTER
12V
5V
GND
SIGNAL
COLLECTiON
PHOTO
INVERTER CIRCUIT High Voltage output
12V
-COUPLER
ISOLATION
PWM CONTROL
CIRCUIT
HVDC 100KHz
PRIMARY SECONDARY
50 ~ 60Hz
Operation description_LIPS
LIPS Board Block Diagram
1. EMI components.
This part contains of EMI components to comply with global marketing EMI standards like FCC,VCCI CISPR, the
circuit included a line-filter, across line capacitor and of course the primary protection fuse.
2. Input rectifier and filter.
This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.
3. Energy Transfer.
This part function is for transfer the primary energy to secondary through a power transformer.
4. Output rectifier and filter.
This part function is to make a pulse width modulation control and to provide the driver signal to power switch,to adjust
the duty cycle during different AC input and output loading condition to achieve the dc output stabilized, and also the
over power protection is also monitor by this part.
5. Photo-Coupler isolation.
This part function is to feed back the dc output changing status through a photo transistor to primary controller to
achieve the stabilized dc output voltage.
6. Signal collection.
This part function is to collect the any change from the dc output and feed back to the primary through photo transistor
7. Inverter
The inverter converts from DC12V to AC 700V and operate back-light lamp of module.

- 12 -
ADJUSTMENT
1. Procedures of how to go to service mode.
1) Enter the service mode of this unit by turning on the
power while pressing and holding the "↓" key
simultaneously.
2) Press "MENU" key----MAINTAIN.
3) Press "OK" key to enter the service menu.
4) Select the desired function.
5) Press the "MENU" key to exit OSD.
6) Turn off the power and then turn on it again. The
monitor then enters the normal mode.
To enter the service again, repeat the procedure
described above.
Note
W/B readjustment is required after the panel, board
and microcomputer are replaced. However, be sure to
perform aging for more than 30 minutes for RGB reset
before W/B adjustment.
2. Setup
1) Prepare timing and pattern data for a signal
generator according to the Sony timing specifications.
2)
Connect a monitor video cable to the signal generator.
3) Put Color Analyzer(ex. CA-110) 50cm away from the
monitor, specify it vertically in the center of the
display, and adjust the focus to the optimum level
using an eyepiece.
4) Put the monitor and Color Analyzer(ex. CA-110) in a
light-shielded room.
5) Set up [SERVICE MODE] of the monitor.
3. Operation
Data is manually set to improve the productivity. The
brightness, contrast, and backlight are set to 50, 70
and 100 respectively. After that, the default data of the
color temperature to be adjusted is set.
4. Warm up time
Warm up for 30 minutes before performing any
adjustment.
5. Adjustment for White Balance
a. Display SMPTE at SXGA/60Hz(Input level 0.73V).
b. Set up [SERVICE MODE].
c. Click "INITIAL EEPROM" and again setup Service
Mode.
d. Click "WHITE BALANCE" and then select “AUTO”.
6. 9300K color adjustment
a. Select "9300K" in "COLOR TEMP" and enter.
b. Use a 35%(89Gray) IRE white video field in the
primary mode.
c. Adjust "SUB CONTRAST " to secure the color
temperature.
d. Press "MENU" key to exit adjust mode.
7. 6500K color adjustment
a. Select "6500K" in "COLOR TEMP" and enter.
b. Repeat the adjustment procedure as steps b to d at
9300K.

- 13 -
NO PROBLEM
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK POWER
BOARD, AND FIND
OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK J705
VOLTAGE
PIN 5, 6, 8(5V)
PIN 1, 2(12V)?
NO
CHECK 5VS LINE
(OPEN CHECK)
CHECK
U501 PIN 8 Voltage
(5V) ?
NO
CHECK IIC LINE
CONNECTION
(U501, U502)
CHECK U201 VCC,
X501 XTAL CHECK
IS U201
PIN94 (3.3V), PIN85(2.5V)
VOLTAGE REPEATED
AS PULSE
SHAPE ?
NO
YES
YES NO PROBLEM
YES
CHECK KEY CONTROL
CONNECTOR ROUTINE

- 14 -
2. NO RASTER (OSD IS NOT DISPLAYED) –LIPS
CHECK MICOM INV
ON/OFF PORT.
CHECK
PIN 9
5V?
NO
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK LIPS
CHECK J705
PIN 5, 6, 8(5V)
PIN 1, 2(12V)
?
NO
1. CONFIRM BRIGHTNESS
OSD CONTRL STATE.
2. CHECK MICOM DIM-ADJ
PORT
CHECK
PIN 10
5V?
NO
LIPS
CHECK
PULSE AS
CONTACTING SCOPE
PROBE TO CAUTION LABEL.
(CONTACT PROBE TO
CAUTION LABEL.
CAN YOU SEE PULSE
AT YOUR
SCOPE?
NO
REPLACE CCFL LAMP
IN THE LCD MODULE
YES
YES
YES
YES

- 15 -
1. CHECK PIN11, 12
SOLDERING CONDITION
2. CHECK X501
3. TROUBLE IN U501
U201
POWER PIN 72,
82, 94(3.3V)
PIN 64, 85 (2.5V)?
NO CHECK U803
(2.5V REGULATOR),
CHECK U804
(3.3V REGULATOR)
U501
PIN11, 12
OSCILLATE AS
12MHZ?
CHECK CONNECTION LINE
FROM D-SUB TO U501
TROUBLE IN CABLE
OR LCD MODULE
YES
YES
YES
3. NO RASTER (OSD IS NOT DISPLAYED) –MST9151A
NO RASTER
(OSD IS NOT DISPLAYED)
U501
PIN43 IS 48KHz H-SYNC?
PIN44 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
NO
NO

- 16 -
4. TROUBLE IN DPM
TROUBLE IN DPM
TROUBLE IN PC
CHECK PC
PC IS NOT GOING
INTO DPM OFF MODE
NO
TROUBLE IN
SIGNAL CABLE
NO
YES
YES
CHECK
R734, R741
(INPUT-1)SYNC.
R732, R755
(INPUT-2)SYNC.
CHECK
U501 PIN 43, 44
(0V) ?

- 17 -
NO U807 PROBLEM
NO
NO
CHECK PC
NO U602 PROBLEM
NO U801 PROBLEM
NO U603 PROBLEM
J601, J602, J603 PROBLEM
CHECK U807 PIN2(12V)?
YES
CHECK J601, J602, J603 AUDIO INPUT.
YES
YES
CHECK U602 PIN 24
CHECK U601 PIN 26, 27
CHECK U801 PIN 3 (5V)
NO CHECK U501 PIN 35 Line
CHECK U601 PIN 16 (5V / 2.5V)
YES
CHECK L601, L605, L606, L607 AMP IC OUT
YES
SPEAKER PROBLEM
YES
5. NO SOUND
NO SOUND
YES
YES
U602 PIN 24 (9V) NO U602 PROBLEM
YES

- 18 -
6. NO EARPHONE SOUND
NO U603 PROBLEM
NO U604 PROBLEM
CHECK U604 PIN 4, 8 INPUT
YES
CHECK U604 PIN 5, 7 OUTPUT.
YES
EARHONE PROBLEM
NO EARPHONE SOUND
YES