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Sharp LC-19SK25U-W Service Manual
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Sharp LC-19SK25U-W Service Manual

Lcd colour television
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In the interests of user-safety (Required by safety regulations in some countries) the set should be re-
stored to its original condition and only parts identical to those specified should be used.
The revised edition added the schematic of SUB3(sound) after Page 81.
ﾈ IMPORTANT SERVICE SAFETY PRECAUTION ..........................................................................................2
ﾈ SPECIFICATIONS .........................................................................................................................................5
ﾈ OPERATION MANUAL ..................................................................................................................................7
ﾈ DIMENSIONS ..............................................................................................................................................11
ﾈ REMOVING OF MAJOR PARTS .................................................................................................................13
ﾈ ADJUSTING PROCEDURE OF EACH SECTION ......................................................................................18
ﾈ PUBLIC MODE SETTING PROCEDURE ...................................................................................................40
ﾈ TROUBLESHOOTING TABLE .....................................................................................................................45
ﾈ MAJOR IC INFORMATIONS .......................................................................................................................53
ﾈ BLOCK DIAGRAM .......................................................................................................................................54
ﾈ OVERALL WIRING DIAGRAM ....................................................................................................................56
ﾈ DESCRIPTION OF SCHEMATIC DIAGRAM ..............................................................................................58
RC/LED Unit ..............................................................................................................................................59
MAIN Unit ..................................................................................................................................................60
SUB Unit ....................................................................................................................................................78
POWER_INVERTER Unit ..........................................................................................................................84
KEY Unit ....................................................................................................................................................86
ﾈ PRINTED WIRING BOARD ASSEMBLIES .................................................................................................87
ﾈ REPLACEMENT PARTS LIST ...................................................................................................................105
ﾈ PACKING OF THE SET .............................................................................................................................124
Revised Edition
LCD COLOR TELEVISION
LC-19SK25U
LC-19SK25U-W
LC-19SB25U
LC-19SB25U-W
LC-19SB15U
LC-19D45U
MODEL
CONTENTS
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
N38B2LC19K25U
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Summary of Contents for Sharp LC-19SK25U-W

  • Page 1: Table Of Contents

    Revised Edition N38B2LC19K25U LCD COLOR TELEVISION LC-19SK25U LC-19SK25U-W LC-19SB25U LC-19SB25U-W LC-19SB15U LC-19D45U MODEL In the interests of user-safety (Required by safety regulations in some countries) the set should be re- stored to its original condition and only parts identical to those specified should be used.
  • Page 2 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U IMPORTANT SERVICE SAFETY PRECAUTION Service work should be performed only by qualified service technicians who are thor- oughly familiar with all safety checks and the servicing guidelines which follow: WARNING earth ground, such as electrical conduit or electrical ground connected to an earth ground.
  • Page 3 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U PRECAUTIONS A PRENDRE LORS DE LA REPARATION La réparation ne peut être effectuée que par un technicien spécialisé qui s'est parfaitement accoutumé à toute vérification de sécurité et aux conseils suivants. AVERTISSEMENT condensateur de 0.15µF en série avec toutes les pièces métalliques exposées du coffret et une terre 1.
  • Page 4 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U Precautions for using lead-free solder 1 Employing lead-free solder "All PWBs" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder. Example: Indicates lead-free solder of tin, silver and copper.
  • Page 5 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U SPECIFICATIONS Item Model: LC-19SK25U/LC-19SK25U-W/LC-19SB25U/LC-19SB25U-W/LC-19SB15U 18.5 o screen size class Advanced Super View & BLACK TFT LCD LCD panel ( Diagonal Measurement: 18 o ) 1,049,088 pixels (1,366 g 768) Resolution TV-standard (CCIR) American TV Standard ATSC/NTSC System Function Receiving VHF/UHF VHF 2-13ch, UHF 14-69ch Channel CATV(analog) 1-135ch (STD, HRC, IRC) Digital Terrestrial 2-69ch Broadcast (8VSB) Digital Cable 1-135ch (64/256 QAM) Audio multiplex BTSC System Audio out 2W g 2...
  • Page 6 Power Requirement AC 120 V, 60 Hz Power Consumption 44 W (0.5 W Standby with AC 120V) TV + stand 11.9 lbs./5.4 kg Weight TV only 10.1 lbs./4.5 kg TV + stand g 14 g 7 inch Dimension (W g H g D) g 12 g 3 inch TV only Operating temperature e 32°F to e 104°F (0°C to e 40°C) Emergency alert messages via Cable are unreceivable. The dimensional drawings are shown on the inside back cover. • As part of policy of continuous improvement, SHARP reserves the right to make design and specification changes for product improvement without prior notice. The performance specification figures indicated are nominal values of production units. There may be some deviations from these values in individual units.
  • Page 7 LC-19SB25U/U-W LC-19SB15U LC-19D45U REMOVING OF MAJOR PARTS (LC-19SK25U/LC-19SK25U-W) 1. Remove the Stand HINGI Cover fixing screw (1 pc.). 2. Remove the stand fixing screws (4 pcs.). 3. Remove the cabinet B fixing screws (10 pcs.). 4. Remove the cabinet B after opening from the direction of an arrow.
  • Page 8 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U (LC-19D45U) 1. Remove the Stand HINGI Cover fixing screw (1 pc.) and the handle fixing screws (4 pcs). 2. Remove the stand fixing screws (4 pcs.). 3. Remove the cabinet B fixing screws (10 pcs.). 4. Remove the cabinet B after opening from the direction of an arrow. 5.
  • Page 9 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U (LC-19SB25U/LC-19SB25U-W/LC-19SB15U) 1. Remove the Stand HINGI Cover fixing screw (1 pc.). 2. Remove the stand fixing screws (4 pcs.). 3. Remove the cabinet B fixing screws (10 pcs.). 4. Remove the cabinet B after opening from the direction of an arrow. 5.
  • Page 10 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U 6. Remove the vesa angle fixing screws (4 pcs.). 7. Remove the 3 lock screws from Main Shield. 8. Remove the 9 lock screws from the sub PWB and main PWB and power PWB and AC angle. Detach the sub PWB and main PWB and power PWB from LCD assembly.
  • Page 11 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U ﾈ Precautions in servicing the side-B (backside) of the main PWB unit 1. Remove the lock screws (2 pcs.) from the main PWB, detach the PWB from the set, and then turn it over. 2. Connect the service-specific extension cable (QCNW-E542WJZZ) between the main PWB (SC1201) and the sub PWB (P501).

  • Page 12: ﾈ Adjusting Procedure Of Each Section

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U ADJUSTING PROCEDURE OF EACH SECTION The adjustment values are set to the optimum conditions at the factory before shipping .If a value should become improper or an adjustment is required due to part replacement, make an adjustment according to the following procedure.
  • Page 13 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U 3. Adjustment procedure 3.1 Plug the AC power cord directly into a wall outlet. 3.2 Calling the adjustment process mode There are two ways to call this mode. ∗ Turn on the power and press the “ADJUST PROCESS” key on the remote controller. ∗...
  • Page 14 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U Signal: color BAR (SATURATION 75%) Setting: 28: XGA H: 48.36KHz V: 60Hz SYNC: OFF Note: Please use the color Bar of SATURATION 2 Adjusting AUTO GAIN-OFFSET in page 5 of DVP(M2-PC)to RUN . When “AUTO GAIN-OFFSET OK” appears , this adjustment is complete NOTE: If want to set all item to ON,please set to RUN in ADJUST PROCESS.
  • Page 15 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U 3.5.3 Common bias Adjustment 1 Feed in built-in signal (See follow picture) 2 Adjust the “COM BIAS” setting so that the peak-to-peak of the wave be minimized.
  • Page 16 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U 3.5.4 White balance adjustment Adjustment item Adjustment conditions Adjustment procedure Setting Backlight: +16 For detailed adjustment procedure refer to "Kameyama Model Integral WB Adjustment (MAX) Specifications". 1) Make the following settings for the set. AV MODE: [DYNAMIC] Backlight: +16 Aging time: Min.

  • Page 17: ﾈ Public Mode Setting Procedure

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U PUBLIC MODE SETTING PROCEDURE 1. How to start Public Mode • There are the following two ways to get the public mode setup screen displayed. 1 In the adjustment process mode, turn on "HOTEL MODE". Also press the "CH ( )"...
  • Page 18 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U 2. How to exit Public Mode There are the following ways to quit the public mode setup screen. • Turn off "HOTEL MODE" in the adjustment process mode. (✩) ← This way alone is not for quitting the setup screen, but for quitting the mode itself.
  • Page 19 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U 5. On Setting Items * "EZ-SETUP" discussed below indicates "EZ-SETUP after the first power-on". (1) POWER ON FIXED Selection Selection between " Variable " " Fixed " (loop provided) Default Variable Explanation " " Fixed setting, the power-off by the power key of the unit is invalidated and the image is kept being re- ceived.
  • Page 20 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U (5) R/C BUTTON Selection " " " " Selection between Respond No respond (loop provide) Default Respond Explanation Keys acceptable by remote control are limited or reception of keys can be prohibited. Limit in Setting " "...
  • Page 21 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U (9) BLUE SCREEN Selection " " " " Selection between (loop provide) Default Explanation In "Yes" setting, when don't receive any signal or no signal input, the screen is blue. Limit in Setting None Exception None Remarks (10) INPUT MODE START Selection...

  • Page 22: ﾈ Troubleshooting Table

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U TROUBLESHOOTING TABLE No power supply (Front LED does not light up) and no power-up even is turned on (Front LED light up to blue) Is the AC cord connected? Connect the AC cord and turn on the power. Are the harness and Cable connected Connect the harness and Cable properly.
  • Page 23 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U TROUBLESHOOTING TABLE (Continued) No audio output during UHF/VHF reception Check the tuner and peripheral circuits. Is SIF output from the tuner (TU1101_Pin15) normal? Check the filter circuits (Q1102, Q1103) and Is input signal fed to pin21 of IC1101? peripheral circuits.
  • Page 24 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U TROUBLESHOOTING TABLE (Continued) No audio output from external input <<INPUT-1>> Is L-ch audio signal fed from input terminal J501 to pin 12 of IC501? Is R-ch audio signal fed from input terminal J501 to pin 12 of IC502? <<INPUT-2>>...
  • Page 25 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U TROUBLESHOOTING TABLE (Continued) <Component video signal input> No video output (INPUT-1) Select INPUT-1 and the input signal on the input switching No video output from extermal input <<INPUT-1>> menu screen. No Check between J501 and pins 7,8 and 9 of P501. Is video signal fed to pins 7, 8 and 9 of P501? (Q501, Q502, Q503) Check between IC801 and IC501.
  • Page 26 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U TROUBLESHOOTING TABLE (Continued) <Composite video signal/S-video signal input> No video output (INPUT2) Select INPUT-2 and the input signal on the input switching No video output from extermal input <<INPUT-2>> menu screen. <Composite video signal input> Check between J502 and pin 11 of IC501. Is video signal fed to pin 11 of P501? <S-video signal input>...
  • Page 27 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U TROUBLESHOOTING TABLE (Continued) No video output during ANALOG broadcasting reception Is video signal sent to output terminal pin 13 of tuner Check or replace the tuner's peripheral circuits. (TU1101)? Is video signal out from pin 1 of P502? Check pin 13 of TU1101 to pin 1 of P502.
  • Page 28 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U TROUBLESHOOTING TABLE (Continued) No video output from HDMI input (INPUT3) Are signals fed from HDMI (SC402) connector to input Is IC403(E PROM) accessed with IIC when connectiong terminals RRX0± (pins 16 and 17),RRX1(pins 19 and HDMI device and is DDC_IIC_CLOCK/DATA data read 20),RRX2(pins 22 and 23),DDCSCL and DDCSDA(pins 31 out? and 32?
  • Page 29 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U TROUBLESHOOTING TABLE (Continued) No video output from PC input (INPUT4) Are signal fed from pins 1,2,3(Analog-R/G/B),and 13,14(H Sync/V Sync) of input terminal (SC401) to pins U2, N3, R, K1, J1 of IC801 (C4US)? Check peripheral circuits of IC801 and Q402,Q405,Q406. Are signals from A6, A1, E1, E2, W5, W6, W7, Y6, AA6 of Check IC801 and peripheral circuits.

  • Page 30: ﾈ Major Ic Informations

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U MAJOR IC INFORMATIONS IC801 (RH-IXC238WJQZQ) This is a system LSI for digital TV integrating a VSB/QAM demodulator, a system decode, an analog front-end with a 3D comb filter, an MPEG2 video decoder, an AC3 audio decode, a display procesor and a 2D graphics engine into a single product.Also integrates a 32-bit RISC-type SuperHarchitecture SH3 CPU for user application software, and an M32R CPU as a sub CPU for the software control of its real-time functions.

  • Page 31: ﾈ Block Diagram

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U BLOCK DIAGRAM MAIN MAIN AV1 COMP-Y AV1 COMP-Y INPUT1 INPUT1 AV1 COMP-Pb AV1 COMP-Pb J501 J501 AV1 COMP-Pr AV1 COMP-Pr AV2 CVBS AV2 CVBS CVBS CVBS INPUT2 INPUT2 AV2 S-Y AV2 S-Y J502 J502 AV2 S-C AV2 S-C AV2 S.DET AV2 S.DET...
  • Page 32 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U IC8201 DDR2 256M PANEL RSDS LK185T3GW LVDS IC9201 T-COM IC8701 FLASH 64M ICC_SDA/SCL IC802 EEPROM IC801 V_BRT LAMP_CTL DTV-C4US UARTRXD/M32TMS TERM RH-IXC238WJQZQ UARTTXD/M32TRST UN12V POWER REGULATORS MODULE LAMP_ON LAMP_ERR TXD_MPU AC_CTL RXD_MPU AC_CTL RESET_N STBY_POW OPERATION KEY1/KEY2 UNIT LCD_ON...

  • Page 33: ﾈ Overall Wiring Diagram

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U OVERALL WIRING DIAGRAM...
  • Page 34 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...

  • Page 35: ﾈ Description Of Schematic Diagram

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U DESCRIPTION OF SCHEMATIC DIAGRAM VOLTAGE MEASUREMENT CONDITION: 1. The voltages at test points are measured on the stable supply voltage of AC 120V. Signals are fed by a color bar signal generator for servicing purpose and the above voltages are measured with a 20k ohm/V tester.

  • Page 36: ﾈ Schematic Diagram

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U SCHEMATIC DIAGRAM  R/C LED Unit...

  • Page 37: Main Unit

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  MAIN Unit - 1/9...
  • Page 38 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...
  • Page 39 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  MAIN Unit - 2/9...
  • Page 40 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...
  • Page 41 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  MAIN Unit - 3/9...
  • Page 42 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...
  • Page 43 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  MAIN Unit - 4/9...
  • Page 44 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...
  • Page 45 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  MAIN Unit - 5/9...
  • Page 46 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...
  • Page 47 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  MAIN Unit - 6/9...
  • Page 48 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...
  • Page 49 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  MAIN Unit - 7/9...
  • Page 50 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...
  • Page 51 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  MAIN Unit - 8/9...
  • Page 52 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...
  • Page 53 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  MAIN Unit - 9/9...
  • Page 54 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...

  • Page 55: Sub Unit

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  SUB Unit - 1/2...
  • Page 56 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...
  • Page 57 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  SUB Unit - 2/2...
  • Page 58 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...
  • Page 59 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  SUB Unit - 3/3...
  • Page 60 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...

  • Page 61: Power_Inverter Unit

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  POWER_INVERTER Unit...
  • Page 62 LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U...

  • Page 63: Key Unit

    LC-19SK25U/U-W LC-19SB25U/U-W LC-19SB15U LC-19D45U  KEY Unit...

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