Funai LCD A1504 User Manual

15″/20″ COLOR LCD TELEVISION
LCD-A1504
LCD-A2004
The LCD panel is manufactured to provide many years of useful life.
Occasionally a few non active pixels may appear as a tiny spec of color.
This is not to be considered a defect in the LCD screen.
 

1-1 L4100SP
SPECIFICATIONS
ANT. Input ------------------- 80 dBµV, Video: PAL 87.5%, Audio: 30 kHz dev (1 kHz Sin)
Test Input Signal ----------- 400Hz 30% modulation



All items are measured across 8Ω load at speaker output terminal with L.P.F.
Note:
Nominal specifications represent the design specifications. All units should be able to approximate these. Some 
will exceed and some may drop slightly below these specifications. Limit specifications represent the absolute 
worst condition that still might...

4-3 L4100DC
Wiring Diagram
Fig. D3
T402
CN101A CN102A
CN31A
CN31B CN801CN802
To Speaker To LCD Module 
AssemblyTo LCD Module Assembly
Function CBAMain CBA LCD Main CBA
To Speaker CN103A CN101BCN320A CN321A
CN102B CN103B
T401
 

4-6 L4200DC
Cable Wiring Diagram
Fig. D3
T1402
CN101A CN102A
CN53 CN405
CN1401CN51
CN51A CN801CN802
To SpeakerTo LCD Module Assembly
Function CBA IR Sensor CBA Inverter CBAMain CBA LCD Main CBA
To Speaker CN103A CN101BCN310A CN311ACN313A
CN102B CN103B
T1401
T1404
To LCD 
Module
Assembly To LCD 
Module
Assembly
T1403
 

5-1 L4100INT
HOW TO INITIALIZE THE LCD TELEVISION
To put the program back at the factory-default, 
initialize the LCD television as the following procedure.
How to initialize the LCD television:
1. Turn the power on. (Use main power on the TV 
unit.)
2. To enter the service mode, press [STANDBY], [2], 
[7], [1], and [MUTE] buttons on the remote control 
unit in that order within 5 seconds.
- To cancel the service mode, press [STANDBY] 
button on the remote control.
3. To initialize the LCD television,...

6-1 L4100EA
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note: 
“CBA” is abbreviation for “Circuit Board Assem-
bly.”
NOTE:
Electrical adjustments are required after replacing 
circuit components and certain mechanical parts. It is 
important to perform these adjustments only after all 
repairs and replacements have been completed. 
Also, do not attempt these adjustments unless the 
proper equipment is available.
Test Equipment Required
1. DC Voltmeter
2. Pattern Generator
3. Color Analyzer
How to Set up...

6-2 L4100EA
2. +B Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
the unit does not operate correctly.
Note: TP401(+B), TP300(GND), VR649 --- Main CBA
1. Connect DC Volt Meter to TP401 and 
TP300(GND).
2. Adjust VR649 so that the voltage of TP401 
becomes +13.0±0.3V DC [LCD-A1504] or 
+21.0±0.3V DC [LCD-A2004].
3. Flicker Adjustment
Adjustment Point: R977 (LCD Main CBA)
1. Enter the Service mode. 
2. Press “2” button on the remote control unit.
The...

6-3 L4100EA
The following adjustment normally are not 
attempted in the field. Only when replacing the 
LCD Panel then adjust as a preparation.
4. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white. 
Symptom of Misadjustment: White becomes bluish
or reddish.
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80% or APL 40%).
3. Set the color analyzer to the CHROMA mode and 
bring the optical receptor to the center on the 
LCD-Panel...

7-1
System Control Block Diagram
L4100BLS
BLOCK DIAGRAMS
KEY-IN-1 44
CN31B
KEY-IN-2 33
RCV30REMOTE
SENSOR
CN31A
FUNCTION CBA
KEY-IN-1 44
CN51A
KEY-IN-2 33
IR SENSOR CBA
CLN53RCV51
D51
RCV-IN 33
REMOTE
SENSOR
IC151
(MICRO CONPUTER)
931052895922
KEY-IN-1 44
CN103B CN103A
RCV-IN 11BACKLIGHT-SW33BACKLIGHT-ADJ22P-ON-H 66PROTECT-1 13 13PROTECT-2 14 14VOLUME 77A-MUTE(NU)88INPUT-0 99INPUT-1 10 10S-SW 15 15SCL 18 18SDA 19 19
16 KEY-IN-1
RCV-IN RESET
P-ON-HPROTECT-1PROTECT-2VOLUME
SDASCLINPUT-0INPUT-1S-SWSCLSDA...

7-2
IF/Video Block Diagram
L4100BLIF
JK75115117
VIDEO-PbVIDEO-Y VIDEO-Pr
TO 
AUDIO
BLOCK DIAGRAM
CN103A INPUT-0(INV)
INPUT-1(INV)
TU1
SIF
SDASCL
7109SIF
MAIN CBA
VIDEO SIGNAL
AUDIO SIGNAL
TO AUDIO  BLOCK
DIAGRAM
Q734
JK722
VIDEO1
-IN
JK721
S-VIDEO
-INTO SYSTEM 
CONTROL 
BLOCK
DIAGRAM
CY
TO
LCD BLOCK 
DIAGRAM (A),(B)
CN103B
IC781
(INPUT SELECT)
Q754 Q702
Q701
SW
CONTROL
10
9
11
INPUT-0
INPUT-1
TO 
SYSTEM CONTROL
BLOCK DIAGRAM
Q872
Q871
Q753
Q752
Q751
(TUNER UNIT)
BUFFERBUFFERBUFFERBUFFERBUFFERBUFFER...