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TCL 21F1 NX56E-LA Service Manual

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SERVICE MANUAL
1. Caution
2. specification
3. Alignment Procedure
4. Block Diagram
5. Signal Processing Introduction
6
PCB Layout
7. Scheme Diagram
8. Specification of Main IC
9 Trouble Shooting
10. BOM List
11 Explode Diagram
This manual is the latest at the time of printing, and does not
include the modification which may be made after the printing, by
the constant improvement of product
TCL
21F1 NX56E-LA
2
6
13
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Summary of Contents for TCL 21F1 NX56E-LA

  • Page 1 SERVICE MANUAL 21F1 NX56E-LA 1. Caution 2. specification 3. Alignment Procedure 4. Block Diagram 5. Signal Processing Introduction PCB Layout 7. Scheme Diagram 8. Specification of Main IC 9 Trouble Shooting 10. BOM List 11 Explode Diagram This manual is the latest at the time of printing, and does not...
  • Page 2 CAUTION: Use of controls, adjustments or procedures other than those specified herein may result in hazardous radiation exposure. CA UTION: TO REDUCE THE RISK OF CAUTION ELECTRICAL SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER SERVICEABLE RISK RISK OF ELECTRI ELECTRIC PARTS INSIDE.

  • Page 3: Important Safety Instructions

    IMPORTANT SAFETY INSTRUCTIONS CAUTION: Read all of these instructions. Save these instructions for later use. Follow all Warnings and Instructions marked on the audio equipment. 1. Read Instructions- All the safety and operating instructions should be read before the product is operated. 2.
  • Page 4 PROTECTION AND LOCATION OF YOUR SET Do not use this television set near water ... for example, near a bathtub, washbowl, kitchen sink, or laundry tub, in a wet basement, or near a swimming pool, etc. Never expose the set to rain or water. If the set has been exposed to rain or water, unplug the set from the wall outlet and refer servicing to qualified service personnel.
  • Page 5 OPERATION OF YOUR SET 18. This television set should be operated only from the type of power source indicated on the marking label. If you are not sure of the type of power supply at your home, consult your television dealer or local power company. For television sets designed to operate from battery power, refer to the operating instructions.
  • Page 6 TCL-Thomson Electronics R&D Center (Shen’Zhen Lab) Product Functional Specification Chassis Name NX56-LA Serial No. Issued On 2008-5-19 Page 1 of 7 Updated On Version...
  • Page 7 TTE Corporation R&D Center (Shen’Zhen Lab) Disclosure Proprietary Information: These drawings and specifications are the property of TCL-Thomson Electronics and shall not be reproduced or copied or used as the basis for the manufacture or sale of apparatus or devices without the written permission of TCL-Thomson Electronics.
  • Page 8 TTE Corporation R&D Center (Shen’Zhen Lab) Revision History Model No. Status Date Comment Prepared by Checked by Released by: Prepared by Checked by Released by: Revised by Checked by Released by: Revised by Checked by Released by: Chassis Name NX56-LA Serial No.
  • Page 9 Model NX56-LA NX56-LA 29185 21M5US Item Master Data -Version -Customer ID -Destination -Brand -BOM NO. 03-B185SAE-SC31 03-DM63SAE-SC31S -Chassis Reception -Tuning [Channels Amt.] -Tuning [Technology] -Tuning [Indication] Channel Channel -Frequency Bands Antenna AND Cable Antenna AND Cable -IF Frequency 45.7MHz 45.7MHz -TV Systems (Color+ Sound) PAL M/N NTSC M PAL M/N NTSC M...
  • Page 10 Model NX56-LA NX56-LA 29185 21F5US Item -Nicam -America Stereo (MTS,BTSC,MPS) -America SAP -Korea Stereo -Thai Bilingual -Super Woofer -AVL -Sound Control [General] Volume Mute -Sound Control [Special] Treble Bass Balance Equalizer Smart Sound * modes Others -Speakers Quantity User Interface -Menu Language English/Portugal/Espanol English/Portugal/Espanol...
  • Page 11 Model NX56-LA NX56-LA 29185 21F5US Item -Front Cabinet Color -Middle Cabinet Color -Rear Cabinet Color -Local Controls Front Mains Switch CH+ CH- VOL+ VOL- TV/AV Menu Auto Search -Local Controls Top CH+ CH- VOL+ VOL- TV/AV Menu Auto Search -Indicator RC Received LED Standby LED Remote Controller...
  • Page 12 Model NX56-LA NX56-LA 29185 21F5US Item Guarantee Doc. Warning Label Approbation Label Others -Languages DFU -Indication on BACKOVER Made-in in family sheet FCC/Elect Shock Caution Label CE/Elect Shock Caution Label Warning Label Others Approbation IEC65 IEC65 Miscellaneous -Mains Voltage 100-240V 100-240V -Mains Frequency 50/60Hz...
  • Page 13 TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) NX56-LA Chassis Alignment Procedure Chassis Name NX56-LA Serial No. Issued on 2008-05-19 Page Page 1 of 15 Updated on 2010-01-27 Version...
  • Page 14 Disclosure ‹ Proprietary Information: These drawings and specifications are the property of TCL-Thomson Electronics and shall not be reproduced or copied or used as the basis for the manufacture or sale of apparatus or devices without the written permission of TCL-Thomson Electronics.

  • Page 15: Revision History

    TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) Revision History Model No. Status Date Comment Prepared by LIPENG 2008-05-15 03-B185SAE-SC31 29185 Checked by 29185/NX56-LA Released by Prepared by LIPENG 2008-05-15 03-DM62SAE-SC31S 21M63US Checked by 21M63US/NX56-LA Released by Prepared by LIPENG 2008-07-4 03-DM83SAE-SC31S...
  • Page 16 TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) 1.1. The way to enter P-Mode a) Method one Switch on the TV set. Press the “MENU” key on RC to show the “PICTURE” OSD menu. Move the cursor to “Contrast” item then press the “9”, “7”, “3”, “5” key continuously on RC within 3 seconds then enter P-Mode.
  • Page 17 TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) Press this key to enter or exit BUS I2C Bus OFF OFF mode DISPLAY STATE SCREEN DISPLAY Display software version 2. Flowchart of alignment procedure B+ adjustment Electrical RF AGC properties adjustment checking for...

  • Page 18: Adjustment Description

    TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) 3. Adjustment description *Notes: Alignment should be done after 3 minutes warm up of TV. 3.1 B+ Voltages 1. All relevant connectors and modules must be connected and inserted. 2. Main voltage is at 220VAC, 50Hz. voltage range:110VAC~240VAC,50Hz 3.
  • Page 19 TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) 3.2 RF AGC alignment 3.2.1 Method 1 A. Connect the detector as shown below (Picture 3.2) to collector of Q101. B. Receive a grey scale signal with 70dB V amplitude. C. Enter P-Mode, press “6” key on RC to select “AGCT”.

  • Page 20: White Balance Adjustment

    TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) Picture 3.3 3.4 White Balance Adjustment 1. Input a black and white pattern to RF input. 2. Enter P-Mode, press key “3 ” to select white balance adjustment menu. 3. Use the color analyzer to measure the black side of the screen. Adjust the value of “RC”,”GC”...
  • Page 21 TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) Screen background is black with No signal BriVSD Brightness of horizontal line when Adjust to right valuege adjust G2 SUBB Brightness Same as user “Brightness” and “Contrast” adjust SubCON Contrast BLOR-Y YUV R -OFFSET...
  • Page 22 TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) 2. Enter P-Mode, press key “2” to select horizontal geometry adjustment. (The OSD menu for this adjustment as below table 3.5.2. For NTSC signal, the “-50” will replace with “-60”.) 3. Adjust the value of the corresponding item to make the horizontal geometry of the pattern look good.
  • Page 23 TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) STB=Standby when power on LAST=Last power off status EEPROM INIT EEPROM initial 0=>1=Active EEPROM initial BRI CURVE >>>>>> Brightness curve Adjust this value CONCURVE >>>>>> Contrast curve Adjust this value COL CURVE >>>>>> Color curve...
  • Page 24 TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) C. C olour curve: OSD menu Default Value Description Remark COL0 Set the minimal colour when user C olour=0 Set the value as practical COL50 Set the colour when user C olor=50 requirement COL100 Set the maximal colour when user C olour=0 D.
  • Page 25 TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) On producing, these geometry offset datum can use to easy the NTSC geometry adjustment. When finished the PAL geometry adjustment, trigger the “AUTO OFFSET” from “0” to “1”, then the geometry adjustment of NTSC signal will finish automated. If now the geometry of NTSC signal is look good, it not needed to adjust the geometry of NTSC signal any more.
  • Page 26 TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) Ratio pre- and aftershoot Don’t adjust, use default 0-1:1, 1-1.5:1, 2-2:1 Ratio of positive and negative peaks Don’t adjust, use default 0-1:1 1-1:1.3, 2-1:1.7, 3-1:0.7 Vottage difference between soft clipping and pwl Don’t adjust, use default...
  • Page 27 TCL-THOMSON Electronics R&D Center (Shen’Zhen Lab) PRESS KEY fault detect Recommended KEY DETECT 1 =detect 0= N0 detect value= 1 Software eliminate bright 0= off BLACK LIGHT Spot when turn off 1=on 0 = TCL TUNER TYPE SET TUNER TYPE...
  • Page 28 RF Section Tuner Tu101 receive the radio frequency signal, after inside circuit to do signal receiving, and signal amplifying. The amplified high frequency signal accompany with the high frequency oscillation voltage oscillated by set oscillator input to the mixer. The IF picture signal and sound signal formed in mixer and output from mixer, then send to picture IF processing circuit.
  • Page 29 Small Signal Processing Section Small signal processing section is the IF (intermediate frequency) signal across saw filter send in the pin12 and pin13 of IC201. The VIFIN signal through built-in PLL DEMOD, sound trap, video amplifier and synchronous detector processing, get the color video broadcast signal and 2 sound IF signal.
  • Page 30 (Fig3. Block Diagram of IC201.) Horizontal Scanning Section The horizontal drive signal send out from pin 56 of IC201, Q401 is horizontal driving transistor, coupled by horizontal driving transformer T402 , to control the horizontal output transistor working in switch on and off situation, get good linearly and enough amplitude of saw-tooth wave current to drive horizontal deflection yoke scanning.
  • Page 31 Vertical Scanning Section Vertical scanning section adopted STV8172A vertical deflection booster, we use as differential-output driver. The vertical raw-tooth wave signal sends out from pin14/15 of IC201 VDA/VDB. The two differential signal input pin 1 and 7 of STV8172A IC301. Pin2(+14v) and Pin7(-14v) of IC301 is power supply which come from the main power transformer.

  • Page 32: Power Supply Section

    Audio Power Amplifying Section Power Supply Section AC supply 220V/110v through filtering network and rectifying circuit and get 300Vdc voltage. LF801/LF801A and CX802 makes up a differential mode rejection, LF802 and CY801,CY802 makes up a common mode rejection network. D801-D804 is rectifying network. 300Vdc voltage supply pin3 of T801, also through R804 send to pin8 of IC801 NCP1337.

  • Page 40: General Description

    UOC-TOP-64 N1 series Versatile signal processor for CRT TV applications Rev. 0.11 — 25 January 2007 Product data sheet 1. General description The UOC-TOP-64 series is a very flexible concept which offers attractive solutions for 1f TV receivers with CRTs. This new concept offers a complete range of products with the right price level to cover TV receivers from basic mono 14 inch sets up to the best featured large and/or wide screen AV-stereo TV sets.
  • Page 41 UOC-TOP-64 N1 series NXP Semiconductors Signal processor for CRT TV 2. Features 2.1 Analog Video Processing 2.1.1 Overview of available features (AV-110/90 and Mono-110 concept) „ Multi-standard vision IF circuit with alignment-free PLL demodulator „ Internal (switchable) time-constant for the IF-AGC circuit „...
  • Page 42 UOC-TOP-64 N1 series NXP Semiconductors Signal processor for CRT TV „ Picture improvement features with peaking (with switchable centre frequency, depeaking, variable positive/negative peak ratio, variable pre-/overshoot ratio and video dependent coring), dynamic skin tone control, gamma control and blue- and black stretching.
  • Page 43 UOC-TOP-64 N1 series NXP Semiconductors Signal processor for CRT TV 2.2 Micro-Controller „ 80C51 m-controller core standard instruction set and timing „ 0.9766 ms machine cycle „ maximum of 80 k x 8-bit late programmed ROM „ maximum of 3 k x 8-bit Auxiliary RAM „...
  • Page 44 UOC-TOP-64 N1 series NXP Semiconductors Signal processor for CRT TV 2.4 Display 2.4.1 Features of the OSD-only devices „ Up to 4 character sets with 256 characters each (size 16 pixels x 18 lines) „ Enhanced OSD modes „ 50Hz/60Hz display timing modes „...

  • Page 45: Quick Reference Data

    UOC-TOP-64 N1 series NXP Semiconductors Signal processor for CRT TV 3. Quick reference data Table 1: Quick reference data SYMBOL PARAMETER MIN. TYP. MAX. UNIT Supply analogue supply voltage VSP supply current (5.0 V) digital supply VSP / analogue supply periphery supply current (3.3 V);...

  • Page 46: Block Diagram

    UOC-TOP-64 N1 series NXP Semiconductors Signal processor for CRT TV 5. Block diagram P-PROCESSOR / TELETEXT DECODER / OSD BCLIN BLKIN/ SVM/ VGUARD **) The mono-110 version has only volume control and no tone control functions Fig 1. Block diagram of the “AV-110/90” and “MONO-110” TV processor <Document ID>...
  • Page 47 UOC-TOP-64 N1 series NXP Semiconductors Signal processor for CRT TV P-PROCESSOR / TELETEXT DECODER / OSD BCLIN BLKIN/VGUARD Fig 2. Block diagram of the “MONO-90” TV processor <Document ID> © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 0.11 — 25 January 2007 10 of 230...

  • Page 48: Pinning Information

    UOC-TOP-64 N1 series NXP Semiconductors Signal processor for CRT TV 6. Pinning information Table 6: Pinning information SYMBOL DESCRIPTION SDIP64 AV-110 AV-90 Mono-90 Mono-110 IFVO/SVO/PIP IF video output / selected CVBS output / PIP output IFVO/SVO IF video output / selected CVBS output supply voltage TV processor (+5 V) VCC8V 8 Volt supply for audio switches...
  • Page 49 UOC-TOP-64 N1 series NXP Semiconductors Signal processor for CRT TV Table 6: Pinning information SYMBOL DESCRIPTION SDIP64 AV-110 AV-90 Mono-90 Mono-110 GND5 ground OTP Programming Voltage VDDA1(3.3V) supply voltage BO/PBOUT Blue output / P output Blue output GO/YOUT Green output / Y output Green output RO/PROUT Red output / P...

  • Page 50: Main Features

    STV8172A ® Vertical Deflection Booster for 3-A TV/Monitor Applications with 75-V Flyback Generator PRODUCT PREVIEW Main Features ■ Power Amplifier HEPTAWATT ■ Flyback Generator (Plastic Package) ORDER CODE: STV8172A ■ Stand-by Control ■ Output Current up to 3 App ■ Thermal Protection Description Input (Non Inverting) The STV8172A is a vertical deflection booster...

  • Page 51: Absolute Maximum Ratings

    Absolute Maximum Ratings STV8172A Absolute Maximum Ratings Symbol Parameter Value Unit Voltage Supply Voltage (pin 2) - Note 1 Note 2 Flyback Peak Voltage - Note 2 Voltage at Pin 3 - Note Note 3 Note 6 -0.4 to (V + 3) Amplifier Input Voltage - Note...

  • Page 52: Electrical Characteristics

    STV8172A Electrical Characteristics Electrical Characteristics = 34 V, T = 25°C, unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit Fig. Supply Operating Supply Voltage Range (V Note 8 Pin 2 Quiescent Current = 0, I Pin 6 Quiescent Current = 0, I = 0, V =35v...
  • Page 53 Electrical Characteristics STV8172A Figure 1: Measurement of I and I 2.2V 39kW STV8172A 5.6kW (a): I2 and I6 measurement (b): I1 measurement Figure 2: Measurement of V 2.2V STV8172A - I5 Figure 3: Measurement of V and V I3 or I5 STV8172A 2.2V (a): V...

  • Page 54: Application Hints

    STV8172A Application Hints Application Hints The yoke can be coupled either in AC or DC. DC-coupled Application When DC coupled (see Figure 4), the display vertical position can be adjusted with input bias. On the other hand, 2 supply sources (V and -V ) are required.

  • Page 55: Ripple Rejection

    Application Hints STV8172A 4.1.1.1 Centering Display will be centered (null mean current in yoke) when voltage on pin 7 is (R is negligible): æ ö ´ ç ÷ ------------------------ --------------------- - è ø 4.1.1.2 Peak Current – V M V m ´...
  • Page 56 STV8172A Application Hints AC-Coupled Applications In AC-coupled applications (See Figure 6), only one supply (V ) is needed. The vertical position of the scanning cannot be adjusted with input bias (for that purpose, usually some current is injected or sunk with a resistor in the low side of the yoke). Figure 6: AC-coupled Application Output (47 to 100μF)
  • Page 57 Application Hints STV8172A performs an integration of the parabolic signal on C , therefore the amount of S correction is set by the combination of C and C Application with Differential-output Drivers Certain driver ICs provide the ramp signal in differential form, as two current sources i and i with opposite variations.

  • Page 61: Colour Television

    NX56 Colour Television Chassis: Figure 1 Fuse Blown Fuse Blown Check IC801 and Is the drain of D801~D804 peripheral Q801 shorted components. to earth? Replace Cheek D809~D812 Replace Q801 Figure2 No Raster Abnormal +B raster abnormal + B Check Q402 collector C resistance to earth Replace Q402 resistance to earth ok?
  • Page 62 NX56 Colour Television Chassis: Figure3 No Raster, +B OK No raster Replace IC201 Replace Q402 B Voltage OK Yes Check the waveform H-out Is the voltage waveform at PIN static working Pin8 56 of IC201 OK? point of Q402. IC202 5v Is the resistance Replace to earth of pin8...
  • Page 63 Colour Television Chassis: NX56 Figure 5 No Vertical Scanning Is both +14V and -14V ok? Is the signal at P1 of Check/Replace IC301 ok? , D410, D411 Check/Replace IC301 Check signal at P14/P15 of IC201 Check circuit Check/Replace IC201 between IC301 IC201 Figure 6 No Picture...

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