JVC LT-26KM18/NSK User manual

SERVICE MANUAL
COPYRIGHT © 2008 Victor Company of Japan, Limited No.YA655<Rev.001>
2008/10
LCD COLOUR TELEVISION
YA655<Rev.001>200810SERVICE MANUAL
LT-26KM18/NSK, LT-26KM28/NSK
COPYRIGHT © 2008 Victor Company of Japan, Limited
<FU2 CHASSIS LINEUP>
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
No.YA587: LT-32EX18 SERIES No.YA645: LT-32BX18 SERIES No.YA649: LT-32BX38 SERIES
No.YA644: LT-32FX38 SERIES No.YA645: LT-32BX38 SERIES No.YA588: LT-42EX18 SERIES
BASIC CHASSIS
FU2

1-2 (No.YA655<Rev.001>)
SPECIFICATION
Design & specifications are subject to change without notice.
Items Contents
Dimensions ( W ×H ×D ) 67.2 cm ×51.9 cm ×23.0 cm [with stand]
67.2 cm ×47.1 cm ×10.8 cm [without stand]
Mass 10.0 kg [with stand]
9.0 kg [without stand]
Power Input AC220V - AC240 V, 50 Hz / 60 Hz
Power Consumption 100 W (Standby:1.2 W)
TV RF System B, G, I, D, K, M
Colour System PAL / SECAM / NTSC 3.58 / NTSC 4.43
Stereo System A2 (B/G, D/K), NICAM (B/G, I, D/K)
Teletext System FLOF (Fastext), WST (World Standard System)
Receiving
Frequency
VHF Low
VHF High
UHF
CATV
46.25 MHz - 140.25 MHz
147.25 MHz - 423.25 MHz
431.25 MHz - 863.25 MHz
Mid (X - Z+2, S1 - S10) / Super (S11 - S20) / Hyper (S21 - S41) bands
Intermediate
Frequency
VIF
SIF
38.9 MHz (B, G, I, D, K, M)
32.26 MHz (5.74 MHz: B), 32.15 MHz (5.85 MHz: G), 31.45 MHz (6.55 MHz: I)
31.75 MHz (6.25 MHz: D), 32.15 MHz (5.85 MHz: K)
Colour Sub
Carrier
PAL
SECAM
NTSC
4.43 MHz
4.40625 MHz / 4.25 MHz
3.58 MHz / 4.43 MHz
LCD panel 26V-inch wide aspect (16 : 9)
Screen Size Diagonal : 66.0 cm (H: 57.58 cm ×V:32.37 cm)
Display Pixels Horizontal : 1366 pixels ×Vertical : 768 pixels (W-XGA)
Audio Power Output 6 W + 6 W
Speaker 5.0 cm ×12.0 cm, oval type ×2
Aerial terminal (VHF/UHF) 75 Ωunbalanced, coaxial
Video / Audio
Input-1/2
Component Video
750p / 1125i
625p / 525p / 625i / 525i
RCA pin jack ×3
Y : 1V (p-p) (Sync signal: ±0.35V(p-p), 3-value sync.), 75 Ω/ Pb/Pr : ±0.35V(p-p), 75 Ω
Y : 1V (p-p), Positive (Negative sync provided), 75 Ω/ Pb/Pr : 0.7V(p-p), 75 Ω
Video 1V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack ×2
Audio 500mV (rms), High impedance, RCA pin jack ×4
PC (RGB) Input Video D-sub 15 pin ×1
R/G/B : 0.7 V (p-p), 75Ω
HD / VD : 1 V (p-p) to 5 V (p-p), high impedance
< Available signal >
VGA : 640 pixels ×480 pixels (Horizontal : 31.5 kHz / Vertical : 60 Hz)
XGA : 1024 pixels ×768 pixels (Horizontal : 48.4 kHz / Vertical : 60 Hz)
Audio 3.5 mm stereo mini jack ×1
HDMI Input Video HDMI connector ×2
(Digital-input terminal is not compatible with picture signals of computer signal)
Audio Digital: HDMI connector ×2
Analog: 500mV(rms) (-4dBs), high impedance, RCA pin jack ×2 [HDMI-1]
Video / Audio Output Video 1V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack ×1
Audio 500mV (rms), Low impedance, RCA pin jack ×2
Headphone 3.5 mm stereo mini jack ×1
Remote Control Unit RM-C2020 (UM-3/AAA/R6 dry cell battery ×2)

(No.YA655<Rev.001>)1-3
SECTION 1
PRECAUTION
1.1 SAFETY PRECAUTIONS
(1) The design of this product contains special hardware,
many circuits and components specially for safety
purposes. For continued protection, no changes should be
made to the original design unless authorized in writing by
the manufacturer. Replacement parts must be identical to
those used in the original circuits. Service should be
performed by qualified personnel only.
(2) Alterations of the design or circuitry of the products should
not be made. Any design alterations or additions will void
the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or
property damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These
characteristics are often not evident from visual inspection
nor can the protection afforded by them necessarily be
obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in
the parts list of Service manual. Electrical components
having such features are identified by shading on the
schematics and by ( ) on the parts list in Service
manual. The use of a substitute replacement which does
not have the same safety characteristics as the
recommended replacement part shown in the parts list of
Service manual may cause shock, fire, or other hazards.
(4) Don't short between the LIVE side ground and
ISOLATED (NEUTRAL) side ground or EARTH side
ground when repairing.
Some model's power circuit is partly different in the GND.
The difference of the GND is shown by the LIVE : ( ) side
GND, the ISOLATED (NEUTRAL) : ( ) side GND and
EARTH : ( ) side GND.
Don't short between the LIVE side GND and ISOLATED
(NEUTRAL) side GND or EARTH side GND and never
measure the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND at the same time with a
measuring apparatus (oscilloscope etc.). If above note will
not be kept, a fuse or any parts will be broken.
(5) When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer's replacement components.
(6) Isolation Check (Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an
isolation check on the exposed metal parts of the cabinet
(antenna terminals, video/audio input and output terminals,
Control knobs, metal cabinet, screw heads, earphone jack,
control shafts, etc.) to be sure the product is safe to operate
without danger of electrical shock.
a) Dielectric Strength Test
The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand a
voltage of 3000V AC (r.m.s.) for a period of one second. (.
. . . Withstand a voltage of 1100V AC (r.m.s.) to an
appliance rated up to 120V, and 3000V AC (r.m.s.) to an
appliance rated 200V or more, for a period of one second.)
This method of test requires a test equipment not generally
found in the service trade.
b) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use
a line isolation transformer during this check.). Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal part of the cabinet, particularly
any exposed metal part having a return path to the chassis,
to a known good earth ground (water pipe, etc.). Any
leakage current must not exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).
Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not
use a line isolation transformer during this check.). Use
an AC voltmeter having 1000Ωper volt or more
sensitivity in the following manner. Connect a 1500Ω
10W resistor paralleled by a 0.15µF AC-type capacitor
between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC voltage
across the resistor with the AC voltmeter. Move the
resistor connection to each exposed metal part,
particularly any exposed metal part having a return path
to the chassis, and measure the AC voltage across the
resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Any voltage measured must
not exceed 0.75V AC (r.m.s.). This corresponds to
0.7mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.35V
AC (r.m.s.). This corresponds to 0.3mA AC (r.m.s.).
AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
1500 10W
0.15 F AC-TYPE
GOOD EARTH GROUND

1-4 (N o.Y A 655< R ev.001> )
1.2 INSTALLATION
1.2.1 HEAT DISSIPATION
If the heat dissipation vent behind this unit is blocked, cooling
efficiency may deteriorate and temperature inside the unit will
rise. The temperature sensor that protects the unit will be
activated when internal temperature exceeds the pre-determined
level and power will be turned off automatically.Therefore,
please make sure pay attention not to block the heat dissipation
vent as well as the ventilation outlet behind the unit and ensure
that there is room for ventilation around it.
1.2.2 INSTALLATION REQUIREMENTS
Ensure that the minimal distance is maintained, as specified
below, between the unit with and the surrounding walls, as well
as the floor etc.Install the unit on stable flooring or stands.Take
precautionary measures to prevent the unit from tipping in order
to protect against accidents and earthquakes.
1.2.3 INSTALLATION REQUIREMENTS
To ensure safety in an emergency such as an earthquake, and
to prevent accidents, ensure that measures are taken to prevent
the TV dropping or falling over.
1.2.4 NOTES ON HANDLING
When taking the unit out of a packing case, do not grasp the
upper part of the unit. If you take the unit out while grasping the
upper part, the LCD PANEL may be damaged because of a
pressure. Instead of grasping the upper part, put your hands on
the lower backside or sides of the unit.
1.3 HANDLING LCD PANEL
1.3.1 PRECAUTIONS FOR TRANSPORTATION
When transporting the unit, pressure exerted on the internal LCD
panel due to improper handling (such as tossing and dropping)
may cause damages even when the unit is carefully packed. To
prevent accidents from occurring during transportation, pay
careful attention before delivery, such as through explaining the
handling instructions to transporters.
Ensure that the following requirements are met during
transportation, as the LCD panel of this unit is made of glass and
therefore fragile:
(1) USE A SPECIAL PACKING CASE FOR THE LCD PANEL
When transporting the LCD panel of the unit, use a special
packing case (packing materials). A special packing case
is used when a LCD panel is supplied as a service spare
part.
(2) ATTACH PROTECTION SHEET TO THE FRONT
Since the front (display part) of the panel is vulnerable,
attach the protection sheet to the front of the LCD panel
before transportation. Protection sheet is used when a LCD
panel is supplied as a service spare part.
(3) AVOID VIBRATIONS AND IMPACTS
The unit may be broken if it is toppled sideways even when
properly packed. Continuous vibration may shift the gap of
the panel, and the unit may not be able to display images
properly. Ensure that the unit is carried by at least 2
persons and pay careful attention not to exert any vibration
or impact on it.
(4) DO NOT PLACE EQUIPMENT HORIZONTALLY
Ensure that it is placed upright and not horizontally during
transportation and storage as the LCD panel is very
vulnerable to lateral impacts and may break. During
transportation, ensure that the unit is loaded along the
traveling direction of the vehicle, and avoid stacking them
on one another. For storage, ensure that they are stacked
in 2 layers or less even when placed upright.
VENTILATION HOLE
*Diagram differs from actual appearance.
*Diagram differs from actual appearance.
150 mm
200 mm
150 mm
200 mm
50 mm
POWER
It fixes in a band.
TV STAND
*Diagram differs from actual appearance.

(No.YA655<Rev.001>)1-5
1.3.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL)
(1) Avoid placing the unit under direct sunlight over a
prolonged period of time. This may cause the optical filter
to deteriorate in quality and COLOUR.
(2) Clean the filter surface by wiping it softly and lightly with a
soft and lightly fuzz cloth (such as outing flannel).
(3) Do not use solvents such as benzene or thinner to wipe the
filter surface. This may cause the filter to deteriorate in
quality or the coating on the surface to come off. When
cleaning the filter, usually use the neutral detergent diluted
with water. When cleaning the dirty filter, use water-diluted
ethanol.
(4) Since the filter surface is fragile, do not scratch or hit it with
hard materials. Be careful enough not to touch the front
surface, especially when taking the unit out of the packing
case or during transportation.
1.3.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR
PARTS
Take note of the following when replacing exterior parts (REAR
COVER, FRONT PANEL, etc.):
(1) Do not exert pressure on the front of the LCD panel (filter
surface). It may cause irregular COLOUR.
(2) Pay careful attention not to scratch or stain the front of the
LCD panel (filter surface) with hands.
(3) When replacing exterior parts, the front (LCD panel) should
be placed facing downward. Place a mat, etc. underneath
to avoid causing scratches to the front (filter surface).
1.3.4 HOW TO CHECK THE OPERATING TIME
This model has a function to count and record the LCD panel
operating time. The operating time can be checked in the
following procedure.
• Maximum count time = 131072 hours
(1) Press the [RETURN+] key and [MUTING] key simultaneous-
ly, then enter the SERVICE MODE.
(2) When the Main Menu is displayed, press [2] key to enter
the self check mode.
(3) The operating time of the LCD panel is displayed in 6
-digit decimal number.(Refer to the below figure)
1.3.5 HOW TO RESET THE OPERATING TIME
(1) Press the [RETURN+] key and [MUTING] key simulta-
neously, then enter the SERVICE MODE.
(2) When the Main Menu is displayed, press [2] key to enter
the self check mode.
(3) When the self check screen is displayed, press [ZOOM]
key to reset the operating time.
NOTE:
• When the LCD PANEL UNIT is replaced, be sure to reset the
operating time following the above method.
• Cannot reset Toytal operating time.
Press [2] key
*When the power is turned off with the remote control unit or the power
button of the main unit, the count restarts from the turn off time.
*When the power is turned off by disconnecting the power cord from the
AC outlet, the recorded time count less than 2 hours is not counted.
*When the operating time exceeds the maximum count time, "MAX" is
displayed to the right of the counted time, and the following count is
discontinued.
SERVICE MODE SCREEN
SELF CHECK MODE SCREEN
SERVICE MENU Ver.xxx
1. ADJUST
2. SELF CHECK
3. I2C STOP
The operating time is displayed.
MAX is displayed when the maximum
count time is exceeded.
The total operating time is displayed.
[Can not reset.]
LOB 9
MEM 0 AIO 3
TUN 0 HDM 3
SYN NG SMD 3
TIME 685536
TOTAL 1371072 MAX

1-6 (No.YA655<Rev.001>)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
HDMI INPUT
By connecting a HDMI compatible device, high definition
pictures can be displayed on your TV in their digital form.
COLOUR MANAGEMENT
This function ensures dull colours are compensated to
produce natural hues.
AI VOLUME
You can adjust the volume of all the channels and video inputs
to the same level automatically depends on the strength of
signal of the sources.
PULL DOWN
This function displays a cinema film picture more smoothly and
naturally on the screen.
2.2 MAIN DIFFERENCE LIST
Item LT-26KM18/NSK LT-26KM28/NSK
Cabinet Colour Black & Black Silver & Black

(No.YA655<Rev.001>)1-7
2.3 TECHNICAL INFORMATION
2.3.1 LCD PANEL
This unit uses the flat type panel LCD (Liquid Crystal Display) panel that occupies as little space as possible, instead of the
conventional CRT (Cathode Ray Tube), as a display unit.
Since the unit has the two polarizing filter that are at right angles to each other, the unit adopts "normally black" mode, where light
does not pass through the polarizing filter and the screen is black when no voltage is applied to the liquid crystals.
2.3.1.1 SPECIFICATIONS
The following table shows the specifications of this unit.
2.3.1.2 PIXEL FAULT
There are three pixel faults - bright fault, dark fault and flicker fault - that are respectively defined as follows.
BRIGHT FAULT
In this pixel fault, a cell that should not light originally is lighting on and off.
For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.
DARK FAULT
In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting.
For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.
FLICKER FAULT
In the pixel fault, a cell that should light originally or not light originally is flashing on and off.
For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on
and off.
Item Specifications
Maximum dimensions ( W ×H ×D ) 76.0 cm ×45.0 cm ×4.5 cm
Weight 4.5 kg
Screen size Diagonal : 66.0 cm (H: 57.58 cm ×V:32.37 cm)
Aspect ratio 16 : 9
Drive device / system a-Si-TFT active matrix system
Resolution Horizontally 1366 ×Vertically 768 ×RGB <W-XGA> 3147264 dots in total
Pixel pitch (pixel size) Horizontally: 0.4215 mm, Vertically: 0.4215 mm
Displayed colour 16777216 colours 256 colours for R G and B
Brightness 450cd/m2
Contrast ratio 2500 : 1
Response time (G to G) less than 6.5 ms
View angle (Horizontally) 176°
View angle (Vertically) 176°
Surface polarizer Anti-Glare type Low reflective coat
Colour filter Vertical stripe
Backlight Cold cathode fluorescent lamp ×6 (U-type)
Power supply voltage in LCD 12 V
Power supply voltage in inverter 24 V
Panel interface system LVDS (Low Voltage Differential Signaling)

1-8 (No.YA655<Rev.001>)
2.3.2 MAIN CPU PIN FUNCTION [IC7001 : DIGITAL PWB]
Pin Pin name I/O Function
1 DGND - GND
2NC -Notused
3NC -Notused
4 VDD33 - 3.3V power supply
5 VSS33 - GND
6 VDD18 - 1.8V power supply
7 VSS18 - GND
8 V1_Y_SYNC I V sync for Input-1
9 PC_VD I V sync for PC
10 MOUT_CV O Video for Monitor out
11 V1_CV I Video for Input-1
12 ADCVSSA - GND
13 V1_Y I Y for Input-1
14 ADCVDDA - 3.3V power supply
15 PC_G I G for PC
16 VREFA I Reference voltage setting
17 VIN4A I Not used
18 VRPA I Reference voltage setting
19 V2_CV I Video for Input-2
20 VRMA I Reference voltage setting
21 TV_CVBS I Video for VHF/UHF tuner
22 ADCVSSB - GND
23 VIN1B I Not used
24 ADCVDDB - 3.3V power supply
25 V1_PB I Pb for Input-1
26 VREFB I Reference voltage setting
27 PC_B I B for PC
28 VRPB I Reference voltage setting
29 VIN4B I Not used
30 VRMB I Reference voltage setting
31 VINFB I Not used
32 DVSSABC - GND
33 DVDDABC - 3.3V power supply
34 VINMX I Not used
35 ADCVSSC - GND
36 VIN1C I Not used
37 ADCVDDC - 3.3V power supply
38 V1_PR I Pr for Input-1
39 VREFC I Reference voltage setting
40 PC_R I R for PC
41 VRPC I Reference voltage setting
42 VRMC I Reference voltage setting
43 PLL1VDD33A - 3.3V power supply
44 LPF1 I LPF setting for PLL
45 PLL1VSS33A - GND
46 PLL1VDDD - 3.3V power supply
47 PLL1VSSD - GND
48 VDD18 - 1.8V power supply
49 VSS18 - GND
50 VDD33 - 3.3V power supply
51 VSS33 - GND
52 NC - Not used
53 NC - Not used
54 DGND - GND
55 VCCQ10 - 1.0V power supply
56 MCLK O Not used
57 SDITDO O Data for SDI
58 SDITDI I Data for SDI
59 SDITCK I Clock for SDI
60 SDITRST I Reset for SDI
61 IISSD O Not used
62 IISWS O Not used
63 IISSCK O Not used
64 VCCQ33 - 3.3V power supply
65 VREF1 I Reference voltage setting
66 VREF2 I Reference voltage setting
67 SIF I SIF for VHF/UHF tuner
68 SAVDD - 3.3V power supply
69 SXIN I 36.864MHz oscillation for sampling clock
70 SXOUT O 36.864MHz oscillation for sampling clock
71 TEST0 I Test mode setting [L fixed]
72 TEST1 I Test mode setting [L fixed]
73 VCCQ10 - 1.0V power supply
74 SDITMS I Mode select for SDI
75 ROUT1 O Audio (Right) for Monitor out
76 VCOM I Reference voltage setting
77 LOUT1 O Audio (Left) for Monitor out
78 AVDDPLL - 3.3V power supply
79 PLLXFCA I Filter setting for HDMI
80 AVSSPLL - GND
81 PLLXFCP I Filter setting for HDMI
82 AVSSPLL - GND
83 PLLXFCX I Filter setting for HDMI
84 AVSSPLL - GND
85 HDMI_PWR1 I Power status detect for HDMI
86 HDMI_SCL O Clock for I2C bus (for HDMI)
87 HDMI_SDA I/O Data for I2C bus (for HDMI)
88 VSSE - GND
89 VDDE - 3.3V power supply
90 AVDDHDMI - 3.3V power supply
91 RXCN I TMDS clock for HDMI
92 RXCP I TMDS clock for HDMI
93 AVSSHDMI - GND
94 RX0N I TMDS data for HDMI
95 RX0P I TMDS data for HDMI
96 AVSSHDMI - GND
97 AVDDHDMI - 3.3V power supply
98 AVSSHDMI - GND
99 RX1N I TMDS data for HDMI
100 RX1P I TMDS data for HDMI
101 AVDDHDMI - 3.3V power supply
102 AVDDHDMI - 3.3V power supply
103 RX2N I TMDS data for HDMI
104 RX2P I TMDS data for HDMI
105 AVSSHDMI - GND
106 EXTRES I For external resistor
107 PVDD - 3.3V power supply
108 PVSS - GND
109 VCCQ10 - 1.0V power supply
110 MPSEL I Mode select for external operation [External = L]
Pin Pin name I/O Function

(No.YA655<Rev.001>)1-9
111 SDVDD - 3.3V power supply
112 XOUT O 27MHz oscillation for CPU system clock
113 XIN I 27MHz oscillation for CPU system clock
114 RESET I CPU reset [Reset = L]
115 VCCQ33 - 3.3V power supply
116 SCK O Clock for external flash memory
117 VCCQ10 - 1.0V power supply
118 VDDQ - GND
119 SDI I Data for external flash memory
120 SDO O Data for external flash memory
121 VCCQ10 - 1.0V power supply
122 CS O Chip select for external flash memory
123 DIN_HOTP1 O Reset for HDMI-1 [Reset = L]
124 DIN_HOTP2 O Reset for HDMI-2 [Reset = L]
125 DIN_SEL O Input select for HDMI-1 or HDMI-2 [HDMI-1 = H]
126 DIN_EQ O
Equalizer for cable length of HDMI [HDMI1.3 compliant cable = L]
127 DIN_RWSW O For digital input protection
128 V2/PC_A_SEL O Not used
129 VCCQ10 - 1.0V power supply
130 HDMI_PWR2 I Not used
131 PXD07 I Not used
132 VDIN I Not used
133 HDIN I Not used
134 PXCLK I Not used
135 PXD08 I Not used
136 PXD09 I Not used
137 PXD10 I Not used
138 PXD11 I Not used
139 VCCQ33 - 3.3V power supply
140 PXD12 I Not used
141 PXD13 I Not used
142 PXD14 I Not used
143 PXD15 I Not used
144 SDVDD - 3.3V power supply
145 VCCQ10 - 1.0V power supply
146 MSN I Control signal for external operation
147 MST I Clock for external operation
148 VCCQ10 - 1.0V power supply
149 MSD I Data for external operation
150 MSQ O Data for external operation
151 VCCQ10 - 1.0V power supply
152 VCCQ33 - 3.3V power supply
153 MAVDD - 3.3V power supply
154 ADIN4 I Not used
155 AFC I AFT voltage for VHF/UHF tuner
156 KEY2 I Key scan for side control (POWER/CH+/CH-/MENU)
157 KEY1 I Key scan for side control (INPUT/VOL+/VOL-)
158 ADIN0 I Not used
159 PLLMAVDD - 3.3V power supply
160 PLLDVDD - 3.3V power supply
161 PLLSAVDD - 3.3V power supply
162 SDVDD - 3.3V power supply
163 SDA1 I/O Data for I2C bus (for tuner/audio)
164 VCCQ33 - 3.3V power supply
165 SCL1 O Clock for I2C bus (for tuner/audio)
166 SDA0 I/O Data for I2C bus (for EEPROM)
Pin Pin name I/O Function
167 SCL0 O Clock for I2C bus (for E2PROM)
168 VCCQ33 - 3.3V power supply
169 AUDIO_MUTE O Speaker/monitor output muting [Muting = H]
170 REMOTE I Remote control sensor input
171 MAIN_POW O Power on/off control for main power [ON = L]
172 LB_POW O Power on/off control for low bias line [ON = L]
173 PFC_POW O Not used
174 PWM_DIM O PWM dimming control for back-light inverter
175 A_DIM O DC dimming control for back-light inverter
176 VCCQ10 - 1.0V power supply
177 LPF2 I LPF setting for PLL
178 VDD33BIAS - 3.3V power supply
179 REFRIN I Bias setting for LVDS
180 VSS33BIAS - GND
181 ETXOUT3P O Not used
182 ETXOUT3M O Not used
183 ETXCLKOUTP O Not used
184 ETXCLKOUTM O Not used
185 VDD33LVDS - 3.3V power supply
186 ETXOUT2P O Not used
187 ETXOUT2M O Not used
188 VSS33LVDS - GND
189 ETXOUT1P O Not used
190 ETXOUT1M O Not used
191 ETXOUT0P O Not used
192 ETXOUT0M O Not used
193 3+ O LVDS data for LCD panel
194 3- O LVDS data for LCD panel
195 CLK+ O LVDS clock for LCD panel
196 CLK- O LVDS clock for LCD panel
197 VDD33LVDS - 3.3V power supply
198 2+ O LVDS data for LCD panel
199 2- O LVDS data for LCD panel
200 VSS33LDVS - GND
201 1+ O LVDS data for LCD panel
202 1- O LVDS data for LCD panel
203 0+ O LVDS data for LCD panel
204 0- O LVDS data for LCD panel
205 PROTECTOR I Power abnormality detection [Emergent = H]
206 LCD_POW O Power on/off control for LCD drive [ON = L]
207 BL_ON O Power on/off control for back-light [ON = L]
208 BL_5060A O Not used
209 POWER_LED O POWER LED(blue) lighting [ON = H]
210 HP_DET I Headphone detect [Detect = H]
211 VCCQ10 - 1.0V power supply
212 VCCQ33 - 3.3V power supply
213 PC_HD I H sync for PC
214 VCCQ10 - 1.0V power supply
215 NC - Not used
216 VCCQ33 - 3.3V power supply
Pin Pin name I/O Function

1-10 (No.YA655<Rev.001>)
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE
• Make sure that the power cord is disconnected from the outlet.
• Pay special attention not to break or damage the parts.
• Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors.
• Be sure to reattach the wire clamps removed during the procedure to the original positions. (Attaching the wire clamps in wrong
positions may affect the performance.)
REFERENCE:
When removing each board, remove the connector if necessary. The operation is easier if you write down the connection points
(connector numbers) of the connector. For connection of each board, refer to the "WIRING DIAGRAM" of the Standard Circuit
Diagram.
3.1.1 REMOVING THE REAR COVER (Fig.3-1)
(1) Remove the 1 screw [A].
(2) Remove the POWER CORD COVER.
(3) Remove the POWER CORD.
(4) Remove the 2 screws [B], 6 screws [C], 7 screws [D] and
2 screws [E].
(5) Remove the REAR COVER.
3.1.2 REMOVING THE POWER PWB (Fig.3-1)
• Remove the REAR COVER.
• Remove the POWER CORD.
(1) Remove the 6 screws [F].
(2) Remove the POWER PWB.
3.1.3 REMOVING THE ANALOG PWB (Fig.3-1)
• Remove the REAR COVER.
(1) Remove the 3 screws [G].
(2) Remove the ANALOG PWB.
3.1.4 REMOVING THE CHOKE COIL (Fig.3-1)
• Remove the REAR COVER.
(1) Remove the 3 screws [H].
(2) Remove the ANALOG PWB.
3.1.5 REMOVING THE DIGITAL PWB (Fig.3-1)
• Remove the REAR COVER.
(1) Remove the 1 screw [I].
(2) Remove the TERMINAL COVER.
(3) Remove the 4 screws [J].
(4) Remove the DIGITAL PWB.
3.1.6 REMOVING THE SW PWB, CONTROL ASSY (Fig.3-1)
• Remove the REAR COVER.
(1) Remove the 2 screws [K].
(2) Remove the SW PWB.
(3) Remove the 2 screws [L].
(4) Remove the CONTROL ASSY.
3.1.7 REMOVING THE INVERTER PWB (Fig.3-1)
• Remove the REAR COVER.
(1) Remove the 6 screws [M].
(2) Remove the INVERTER PWB COVER.
(3) Remove the INVERTER PWB.
3.1.8 REMOVING THE SPEAKER (Fig.3-1)
• Remove the REAR COVER.
(1) Remove the 4 screws [N].
(2) Remove the SPEKAER.
3.1.9 REMOVING THE STAND (Fig.3-1)
(1) Remove the 4 screws [P].
(2) Remove the STAND.
3.1.10 REMOVING THE SPEAKER HOLDER (Fig.3-1)
• Remove the REAR COVER.
• Remove the SPEKAER.
• Remove the STAND.
(1) Remove the 3 screws [Q], 2 screws [R] and 3 screws [S].
(2) Remove the MAIN BASE.
(3) Remove the 2 screws [T].
(4) Remove the STAND BASE COVER.
(5) Remove the 3 screws [U], 4 screws [V] and 2 screws [W].
(6) Remove the BOTTOM FRAME.
(7) Remove the 3 screws [Q], 2 screws [R] and 3 screws [S].
(8) Remove the SPEKAER HOLDER.
3.1.11 REMOVING THE LED PWB (Fig.3-1)
• Remove the REAR COVER.
• Remove the STAND.
• Remove the MAIN BASE.
• Remove the BOTTOM FRAME.
(1) Remove the 2 screws [Y] and 2 hooks [a].
(2) Remove the LED PWB.
3.1.12 REMOVING THE LCD CONTROL PWB (Fig.3-1)
• Remove the REAR COVER.
• Remove the STAND.
• Remove the MAIN BASE.
• Remove the BOTTOM FRAME.
(1) Remove the 2 screws [Z].
(2) Remove the TOP FRAME.
(3) Remove the 4 screws [AA].
(4) Remove the LCD CONTROL PWB COVER.
(5) Remove the INVERTER PWB.
3.1.13 REMOVING THE LCD PANEL UNIT (Fig.3-1)
• Remove the REAR COVER.
• Remove the STAND.
• Remove the MAIN BASE.
• Remove the BOTTOM FRAME.
• Remove the TOP FRAME.
(1) Remove the LCD PANEL UNIT from the FRONT PANEL.

(No.YA655<Rev.001>)1-11
Fig.3-1
CC
FF
RR
QQ
RR
AAAA
MM
KK LL
KK
ZZ
HH
YY
VV
WW
BB CC
EE
TT
PP
AA
TT
JJ
SS II
UU
GG
DD
XX
NN
NN
XX
XX
STAND
FRONT PANEL
CONTROL ASSY
SW PWB
SPEAKER HOLDER
SPEAKER HOLDER
SPACER
SPEAKER
SPEAKER
LCD PANEL UNIT
TOP FRAME
LCD CONTOROL
PWB
LCD CONTOROL
PWB COVER
INVERTER
PWB COVER BOTTOM FRAME
IR+LED PWB
MAIN BASE
TERMINAL BASE
STAND BASE COVER
POWER CORD COVER
POWER CORD
ANALOG
PWB
DIGITAL PWB
POWER PWB
REAR COVER
CHOKE COIL
INVERTER PWB

1-12 (No.YA655<Rev.001>)
3.2 MEMORY IC REPLACEMENT
• This model uses the memory IC.
• This memory IC stores data for proper operation of the video and drive circuits.
• When replacing, be sure to use an IC containing this (initial value) data.
3.2.1 MEMORY IC TABLE
3.2.2 MEMORY IC REPLACEMENT PROCEDURE
1. POWER OFF
Switch off the power and disconnect the power plug from the
AC outlet.
2. REPLACE THE MEMORY IC
Be sure to use the memory IC written with the initial setting
values.
3. POWER ON
Connect the power plug to the AC outlet and switch on the
power.
4. SERVICE MODE SETTING [SYSTEM CONSTANT SETTING]
(1) Press the [DISPLAY] key and [MUTING] key
simultaneously, then enter the SERVICE MODE.
(2) Press the [8] key, then enter the SYSTEM CONSTANT
SET SCREEN.
(3) Check the setting values of the SYSTEM CONSTANT
SET. If the value is different, set the correct value with
the [FUNCTION /]key.
5. RECEIVING CHANNEL SETTING
Refer to the OPERATING INSTRUCTIONS and set the
receive channels (Channels Preset) as described.
6. USER SETTING
Check the user setting items according to the given in page
later. Where these do not agree, refer to the OPERATING
INSTRUCTIONS and set the items as described.
7. SERVICE MODE SETTING [ADJUST MODE SETTING]
Verify what to set in the SERVICE MODE, and set whatever is
necessary (Fig.3-3). Refer to the SERVICE ADJUSTMENT for
setting.
* Input PAL White Raster signal 75% ( Y = 525 mV and SYNC
= 0.3 V ) at VDO 2 for adjustment.
SERVICE MODE SCREEN
Fig.3-3
SYSTEM CONSTANT SETTING
Symbol Number of pins Mounting PWB Main content of data
IC7002 8-pin DIGITAL PWB Setting value of IC7001 (MAIN CPU) is memorized.
IC7003 8-pin DIGITAL PWB Programming data of IC7001 (MAIN CPU) is memorized.
Setting mode Iitem No. Setting items Settings
1.ADJUST S001 R DRIVE MID Do not adjust
S002 G DRIVE MID Adjust
(Do not over 128)
S003 B DRIVE MID Adjust
(Do not over 128)
S004 R DRIVE COOL Do not adjust
S005 G DRIVE COOL Do not adjust
S006 B DRIVE COOL Do not adjust
S007 R DRIVE WARM Do not adjust
S008 G DRIVE WARM Do not adjust
S009 B DRIVE WARM Do not adjust
Setting item Setting value
1.No Sound No
2.HDMI Mode YES
3.Clear SD RV
SERVICE MODE SCREEN
Press [1] key
Press [8] key
ADJUST MODE SCREEN
SERVICE MENU Ver.xxx
1. ADJUST
2. SELF CHECK
3. I2C STOP
S001 R DRIVE MID 128
PAL FULL STD M
System Constant
1. No Sound : xxx
2. HDMI Mode : xxx
3. Clear SD : xxx
Version
Model=FU UltraMulti
Soft=x.xx, E2PROM =xxxx
Trans ver=x.xx
Para ver=xxxxxx
Date=xxxxxxx
SYSTEM CONSTANT SCREEN

(No.YA655<Rev.001>)1-13
3.2.3 SETTINGS OF FACTORY SHIPMENT
3.2.3.1 BUTTON OPERATION
3.2.3.2 REMOTE CONTROL DIRECT OPERATION
3.2.3.3 REMOTE CONTROL MENU OPERATION
(1) PICTURE
(2) SOUND
(3) FEATURES
(4) SET UP
3.2.4 VSM SETTING
Note: " * " Adjustable range is 0-128 only (Don't over 128)
Setting item Setting position
POWER Off
CHANNEL PR1
VOLUME 15
TV/AV TV
Setting item Setting position
CHANNEL PR1
VOLUME 15
SUB POWER OFF
Setting item Setting position
PICTURE MODE Bright
White balance Cool
FEATURES
Clear SD Off
Digital VNR On
DigiPure On
Pull Down Off
Colour Management On
Picture Management On
COLOUR SYSTEM TV Depends on PR/CH
EXT Auto
Zoom Auto (Panoramic)
Setting item Setting position
STEREO / I•II Stereo sound
Bass Centre
Treble Centre
Balance Centre
Cinema Surround Off
Setting item Setting position
On Timer Off
Sleep Timer Off
Channel Guard Off (ID:0000)
Blue Back On
Child Lock Off
Auto Shutoff Off
Favourite Setting Blank
Power Lamp On
Eco Mode Off
Setting item Setting position
Auto Program TV channel automatically set
Edit/manual Preset CH only
Language English
Video-1 Setting Component
AI Volume On
Appearance Size-1
Teletext Language Group-1
HDMI SETTING
HDMI-1 Size Auto
HDMI-1 Audio Auto
HDMI-2 Size Auto
VSM PRESET
Soft Bright Standard White MID COOL WARM
Back Light 16 32 23 R 128 -024 -000
Contrast 16 19 16
Bright 16 16 16 G 128* -009 -006
Sharp 16 20 16
Colour 16 16 16 B 128* -000 -019
Tint 16 16 16

1-14 (No.YA655<Rev.001>)
3.3 REPLACEMENT OF CHIP COMPONENT
3.3.1 CAUTIONS
(1) Avoid heating for more than 3 seconds.
(2) Do not rub the electrodes and the resist parts of the pattern.
(3) When removing a chip part, melt the solder adequately.
(4) Do not reuse a chip part after removing it.
3.3.2 SOLDERING IRON
(1) Use a high insulation soldering iron with a thin pointed end of it.
(2) A 30w soldering iron is recommended for easily removing parts.
3.3.3 REPLACEMENT STEPS
1. How to remove Chip parts
[Resistors, capacitors, etc.]
(1) As shown in the figure, push the part with tweezers and
alternately melt the solder at each end.
(2) Shift with the tweezers and remove the chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply extra solder to each lead.
(2) As shown in the figure, push the part with tweezers and
alternately melt the solder at each lead. Shift and remove
the chip part.
NOTE :
After removing the part, remove remaining solder from the
pattern.
2. How to install Chip parts
[Resistors, capacitors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the
solder. Then heat and melt the solder at both ends of the
chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the
solder.
(3) First solder lead Aas indicated in the figure.
(4) Then solder leads Band C.
SOLDER SOLDER
A
B
C
A
B
C

(No.YA655<Rev.001>)1-15
SECTION 4
ADJUSTMENT
4.1 ADJUSTMENT PREPARATION
(1) This TV is adjusted by using REMOTE CONTROL UNIT.
(2) The adjustment using the REMOTE CONTROL UNIT is made on the basic of the initial setting values. The setting values
which adjust the screen to the optimum condition can be different from the initial setting values.
(3) Make sure that connection is correctly made AC to AC power source.
(4) Turn on the power of the TV and measuring instruments for warming up for at least 30 minutes before starting adjustments.
(5) If the receive or input signal is not specified, use the most appropriate signal for adjustment.
(6) Never touch the parts (such as variable resistors, transformers and condensers) not shown in the adjustment items of this service
adjustment.
4.2 PRESET SETTING BEFORE ADJUSTMENTS
Unless otherwise specified in the adjustment items, preset the
following functions with the REMOTE CONTROL UNIT.
4.3 MEASURING INSTRUMENT AND FIXTURES
• Signal generator (Pattern generator)[PAL]
• Remote control unit
4.4 BASIC OPERATION OF SERVICE MODE
4.4.1 HOW TO ENTER THE SERVICE MODE
(1) Press [RETURN+] key and [MUTING] key on the remote
control unit simultaneously to enter the SERVICE MODE
SCREEN.
4.4.2 HOW TO EXIT THE SERVICE MODE
Press the [MENU] key to exit the Service mode.
4.4.3 CHANGE AND MEMORY OF SETTING VALUE
SELECTION OF SETTING ITEM
• [[FUNCTION /] key.
For scrolling up / down the setting items.
CHANGE OF SETTING VALUE (DATA)
•[[FUNCTION /]key.
For scrolling up / down the setting values.
MEMORY OF SETTING VALUE (DATA)
The setting value will be stored automatically when release the
REMOTE CONTROL UNIT keys.
4.4.4 SERVICE MODE SELECT KEY LOCATION
Setting item Settings position
Picture Mode Standard
PICTURE adjustments Centre
White Balance Mid
SERVICE MODE SCREEN
NOT USED
Refer to SECTION5
SERVICE MENU Ver.XXX
1. ADJUST
2. SELF CHECK
3. I2C STOP
FUNCTION
/
FUNCTION
/
MUTING
RETURN+

1-16 (No.YA655<Rev.001>)
4.4.5 ADJUSTMENT MODE
This mode is used to adjust the VIDEO CIRCUIT.
4.4.5.1 HOW TO ENTER THE ADJUSTMENT MODE
When the SERVICE MENU SCREEN of SERVICE MODE is
displayed, press [1] key to enter the ADJUSTMENT MODE.
NOTE:
• When a number key other than the [1] key is pressed in the
SERVICE MODE SCREEN, the other relevant screen may
be displayed.
This is not used in the adjustment procedure. Press the
[MENU] key to return to the SERVICE MODE SCREEN.
4.4.5.2 DESCRIPTION OF STATUS DISPLAY
(1) SIGNAL SYSTEM
The signal displayed on the screen is displayed.
(2) ZOOM MODE
State of the ZOOM MODE is displayed.
(3) PICTURE MODE
State of the PICTURE MODE is displayed.
(4) WHITE BALANCE MODE
State of the WHITE BALANCE MODE is displayed.
(5) SETTING ITEM No.
State of the Setting Item No. are displayed.
(6) SETTING ITEM NAME
Setting item name are displayed. The setting item numbers to
be displayed are listed below.
(7) SETTING VALUE (DATA)
The SETTING VALUE is displayed.
PAL50 : PAL50Hz
PAL60 : PAL60Hz
SECAM : SECAM
NTSC3 : NTSC3.58
NTSC4 : NTSC4.43
525I : 525i
525P : 525p
625I : 625i
625P : 625p
750P5 : 750p 50Hz
750P6 : 750p 60Hz
1125I5 : 1125i 50Hz
1125I6 : 1125i 60Hz
1125P5 : 1125P 50Hz
1125P6 : 1125P 60Hz
--- : Others
HXGA : HDMI XGA
SERVICE MODE SCREEN
Press [1] key
(1)SIGNAL SYSTEM
(2)ZOOM MODE
(7) SETTING VALUE (DATA) (5)SETTING ITEM No. (6)SETTING ITEM
(4)WHITE BALANCE
(3)PICTURE MODE
S001 R DRIVE MID 128
NTSC3 FULL STD M
ADJUST MODE SCREEN
SERVICE MENU Ver.XXX
1. ADJUST
2. SELF CHECK
3. I2C STOP
PCVGA : PC VGA/60
PCXGA : PC XGA/60
PCSXGA : SXGA/60
PCSVGA : PC SVGA/60
PCWXGA : WideXGA(1360)/60
H525I : HDMI 525i
H525P : HDMI 525p
H625I : HDMI 625i
H625P : HDMI 625p
H750P5 : HDMI 750p 50Hz
H750P6 : HDMI 750p 60Hz
H125I5 : HDMI 1125i 50Hz
H125I6 : HDMI 1125i 60Hz
H125P5 : HDMI 1125P 50Hz
H125P6 : HDMI 1125P 60Hz
FUL : FULL
PAN : PANORAMIC
16Z : 16:9 ZOOM
14Z : 14:9 ZOOM
REG : REGULAR
STD : Standard
BRI : Bright
SOFT : Soft
H : Cool
M:Mid
L:Warm
Setting mode Setting items Settings
1.ADJUST R DRIVE MID Do not adjust
G DRIVE MID Adjust (Do not over 128)
B DRIVE MID Adjust (Do not over 128)
R DRIVE COOL Do not adjust
G DRIVE COOL Do not adjust
B DRIVE COOL Do not adjust
R DRIVE WARM Do not adjust
G DRIVE WARM Do not adjust
B DRIVE WARM Do not adjust

(No.YA655<Rev.001>)1-17
4.5 INITIAL SETTING VALUES IN THE SERVICE MODE
• Perform fine-tuning based on the "initial values" using the remote control when in the Service mode.
• The "initial values" serve only as an indication rough standard and therefore the values with which optimal display can be achieved
may be different from the default values.
• <S004> to <S009> are the off set values.
4.5.1 ADJUSTMENT MODE
*Adjusttable range is 0000-0128 only (Don’t over “0128”)
4.6 ADJUSTMENT PROCEDURE
4.6.1 VIDEO CIRCUIT
Item No. Item name Variable range Setting value
S001 R DRIVE MID 0000 - 0255 0128 [Do not adjust]
S002 G DRIVE MID 0000 - 0255 0128*
S003 B DRIVE MID 0000 - 0255 0128*
S004 R DRIVE COOL 0000 - 0255 (-024) [Do not adjust]
S005 G DRIVE COOL 0000 - 0255 (-009) [Do not adjust]
S006 B DRIVE COOL 0000 - 0255 (-000) [Do not adjust]
S007 R DRIVE WARM 0000 - 0255 (-000) [Do not adjust]
S008 G DRIVE WARM 0000 - 0255 (-006) [Do not adjust]
S009 B DRIVE WARM 0000 - 0255 (-019) [Do not adjust]
Item Measuring
instrument Test point Adjustment part Description
WHITE
BALANCE
(HIGHLIGHT)
Remote
control unit
Signal
generator
[1.ADJUST]
S001: R DRIVE MID
S002: G DRIVE MID
S003: B DRIVE MID
(1) Receive a PAL 75% all white signal.
(2) Set PICTURE MODE to "STANDARD".
(3) Set ZOOM to "FULL".
(4) Set WHITE BALANCE. to "MID".
(5) Select "1.ADJUST" from the SERVICE MODE.
(6) Adjustment is select item from <S001>(R DRIVE
MID), <S002>(G DRIVE MID), <S003>(B
DRIVE MID).
(7) Select <S001> item fix to 128 Other color
<S002>, <S003> should be less than 128.
NOTE:
Adjusttable range is 0000-0128 only (Don't
over "0128").
(8) Must check white balance adjustment correctry
with low light to high light.

1-18 (No.YA655<Rev.001>)
SECTION 5
TROUBLESHOOTING
5.1 SELF CHECK FEATURE
5.1.1 OUTLINE
This unit comes with the "Self check" feature, which checks the
operational state of the circuit and displays/saves it during
failure.Diagnosis is performed when power is turned on, and
information input to the main microcomputer is monitored at all
time.Diagnosis is displayed in 2 ways via screen display and LED
flashes. Failure detection is based on input state of I2C bus and
the various control lines connected to the main microcomputer.
5.1.2 HOW TO ENTER THE SELF CHECK MODE
(1) Press the [RETURN+] key and [MUTING] key
simultaneously, then enter the SERVICE MODE.
(2) Press the [2] key then enter the SELF CHECK MODE.
NOTE:
When a number key other than the [2] key is pressed in the
SERVICE MODE screen, the other relevant screen may be
displayed.
This is not used in the SELF CHECK MODE. Press the
[MENU] key to return to the MAIN MENU SCREEN.
5.1.3 HOW TO EXIT THE SELF CHECK MODE
To Save Failure History:
Turn off the power by unplugging the AC power cord plug when
in the Self check display mode.
To Clear (Reset) Failure History:
Turn off the power by pressing the [POWER] key on the remote
control unit when in the Self check display mode.
5.1.4 FAILURE HISTORY
Failure history can be counted up to 9 times for each item. When
the number exceeds 9, display will remain as 9. Failure history
will be stored in the memory unless it has been deleted.
NOTE:
Only SYNC (with/without sync signals) will be neither counted
nor stored.
5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECK
FEATURE
In addition to circuit failures (abnormal operation), the following
cases may also be diagnosed as "Abnormal" and counted.
(1) Temporary defective transmissions across circuits due to
pulse interruptions.
(2) Misalignment in the on/off timing of power for I2C bus (Vcc)
when turning on/off the main power.
Therefore, turn on the main power, and then wait for about 3
seconds before starting Self check.
If recurrences are expected, ensure to clear (reset) the failure
history and record the new diagnosis results.
Fig.5-1
Press [2] key
SERVICE MODE SCREEN
SELF CHECK MODE SCREEN
SERVICE MENU Ver.xxx
1. ADJUST
2. SELF CHECK
3. I2C STOP
NOT USED
Refer to SECTION1
Failure history
LOB 9
MEM 0 AIO 3
TUN 0 HDM 3
SYN NG SMD 3
TIME 685536
TOTAL 1371072 MAX
Diagnosis
OK:Normal
NG:Abnormal

(No.YA655<Rev.001>)1-19
5.1.6 DETAILS
Self check is performed for the following items:
5.1.7 METHOD OF DISPLAY WHEN A RASTER IS NOT OUTPUT
In the state where a raster is not output by breakdown of the set, an error is displayed by blink of the POWER LED.
< Explanation of operation >
If error is detected, the power is turned off. Shortly after the power is turned off, POWER LED will be blinked.
When the protection of low bias line short operates, the power cannot be turned on until the power cord takes out and inserts, after
the power is turned off.
Detection item Display Detection content Diagnosis
signal (line) Detection timing
Low bias line short
protection
LOB Confirm the operation of the low bais(5V/12V/14V/16V/
24V) protection circuit.
5V: Q9201 [DIGITAL PWB]
12V: Q9301 [DIGITAL PWB]
14V: Q9503 [POWER PWB]
16V: Q9505 [POWER PWB]
24V: Q9506 [POWER PWB]
PROTECTOR Detection starts 3 seconds after
the power is turned on. If error
continues between 200 ms the
power is turned off.
MAIN MEMORY MEM Confirmation of reply of ACK signal which uses I2C
communication.
IC7002 [DIGITAL PWB]
SDA Detection starts 3 seconds after
the power is turned on.If it checks
whenever I2C communication is
performed and no reply of ACK
signal an error will be counted.
AUDIO AIO Confirmation of reply of ACK signal which uses I2C
communication.
IC6002 [DIGITAL PWB]
SDA Detection starts 3 seconds after
the power is turned on.If it checks
whenever I2C communication is
performed and no reply of ACK
signal an error will be counted.
RF TUNER TUN Confirmation of reply of ACK signal which uses I2C
communication.
TU1001 [ANALOG PWB]
SDA Detection starts 3 seconds after
the power is turned on.If it checks
whenever I2C communication is
performed and no reply of ACK
signal an error will be counted.
HDMI HDM Confirmation of reply of ACK signal which uses I2C
communication.
IC8502 [DIGITAL PWB]
SDA Detection starts 3 seconds after
the power is turned on.If it checks
whenever I2C communication is
performed and no reply of ACK
signal an error will be counted.
SYNC SIGNAL SYN Confirmation of presence of sync signal in selected
video signal.
IC7001 [DIGITAL PWB]
--- The selected video input signal is
always checked and if there is the
sync signal, it is displayed as
"OK", and if not as "NG".
Type of error POWER LED flash cycle
Low bias line short protection Power LED turnig on and off at 1 second intervals.

(No.YA655<Rev.001>)
VPT
Printed in Japan
Victor Company of Japan, Limited
Display Division 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan