Norcent LT2022 SERIES Service Manual
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Norcent LT2022 SERIES Service Manual

Lcd tv monitor
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NORCENT LT2022
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LCD TV MONITOR
LT2022 SERIES
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY
REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL;
WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE
OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR
OMISSIONS.
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Summary of Contents for Norcent LT2022 SERIES

  • Page 1 NORCENT LT2022 LCD TV MONITOR LT2022 SERIES THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR...

  • Page 2: Table Of Contents

    NORCENT LT2022 Table of Contents Table of Contents …..................…………...….. 1. Specifications …..................…………...….. 1.1 General Specifications ………………………………………………………………………………. 1.2 LCD TV Description ......................... 1.3 Interface Connectors ..................…………..…. 2. Adjustment................……………...…………………. 2.1 Use of the Remote Control..................…………..2.2 Use of the Menus ....................…………..2.2.1 Front Panel Control Knobs............………………………………..……...

  • Page 3: Specifications

    NORCENT LT2022 1. Specifications 1.1 General Specifications Items Specification Screen Size 20” TFT-LCD Panel Aspect Ratio Resolution 640 x 480 (VGA) Display Area (opening) H x V 408mm x 306mm Pixel Pitch 0.212mm x 0.637mm Display colors 16.7 million LCD Panel...

  • Page 4: Lcd Tv Description

    NORCENT LT2022 1.2 LCD TV Description The LCD TV will contain a main board (include audio), a switching power board (include an inverter board), an IR board, a Headphone jack board and a function keyboard. The main board and power board will house the...

  • Page 5: Adjustment

    NORCENT LT2022 2. Adjustment 2.1 Use of the Remote Control POWER: MUTE Press to turn on/off the TV. The Temporarily interrupt the TV is never completely powered sound or restore it. off unless it is physically unplugged. DISPLAY Press this button to Display...

  • Page 6: Use Of The Menus

    NORCENT LT2022 2.2 use of the menus 2.2.1 Front Panel Control Knobs Press to turn on or off the TV. Power Key: Press to show the OSD menu and exit OSD menu at the TV. MENU Key: Press to perform select function and channel.
  • Page 7 NORCENT LT2022 5. Reset is set up to default value. When adjust any item sub-OSD will show up like this AUDIO ADJUST 1. Volume is adjusted from 0 to 100. 2. Bass and Treble are adjusted from 0 to 100.
  • Page 8 NORCENT LT2022 information or stock marker reports. Not all Closed Caption modes are necessarily being use by a TV channel during the transmission of a Closed Caption program. V-CHIP SETUP Select V-Chip on OSD then enter 4 digits of pin number.
  • Page 9 NORCENT LT2022 CHANGE PIN (personal identification number) is needed for changing password to control V-chip setup. Process as follows: 1) Enter old pin code 2) Enter new pin code 3) Confirm new pin by entering new pin one more time.

  • Page 10: Trouble Shooting Chart

    NORCENT LT2022 3. Trouble Shooting Chart Defect Mode Failure Analysis Repair Testing Missing Line Abnormal Display Bright Dot Dark Dot Light Leakage Mura Check Panel Panel Change Image Sticking Dot Defect Brightness Spot Dot Defect Particle No display Check Power Board...
  • Page 11 NORCENT LT2022 Noise Check Single Cable Change Single Cable Flicker Check Main board Change Main board Change Panel Check Panel Abnormal Check Main board Change Main board Gray Check Panel Change Panel Check LVD Cable Change LVDS Cable R\G\B Display...
  • Page 12 NORCENT LT2022 LED Display Change Keyboard or LED Off Abnormal Main board or wire Change Keyboard or LED Dark Main board Change Keyboard or LED Abnormal Main board or wire Change Keyboard or LED Flicker Main board or wire Abnormal...
  • Page 13 NORCENT LT2022 Key Board OSD is unstable or not working Is Key Pad Board connecting normally? Connect Key Pad Board Replace Button Switch Is Button Switch normally? Is Key Pad Board Normally? Replace Key Pad Board Check Main Board...

  • Page 14: White-Balance, Luminance Adjustment

    NORCENT LT2022 4. White-Balance, Luminance adjustment Approximately 30 minutes should be allowed for warming up before proceeding white balance adjustment. Before started adjust white balance, please setting the Chroma-7120 MEM. Channel 1 to 9300 color. (Our 9300 parameter is x =283, y = 297, Y> 350cd/cm2 (TV Mode)) For setting MEM.

  • Page 15: Software Flow Chart

    NORCENT LT2022 5. Software Flow Chart...
  • Page 16 NORCENT LT2022 1) MCU initializes. 2) Is the EEPROM blank? 3) Program the EEPROM by default values. 4) Get the PWM value of brightness from EEPROM. 5) Is the power key pressed? 6) Clear all global flags. 7) Are the AUTO and SELECT keys pressed? 8) Enter factory mode.

  • Page 17: Bom

    NORCENT LT2022 6. BOM EA64MSNKB2NCPVC Location Part No. for TPV Description Quantity Unit M1V 330 4128 SCREW M3X4 CBPFA64KMSE1P CONVERSION BOARD PWTV2062CM1 20" POWER BOARD ASS'Y 1V6012 1 SCREW 15T5943 6 MAIN FRAME 15T8024 1 AC-SOCKET 15V5930 1 BKT CONNECTOR...
  • Page 18 SCREW 3X12mm Q1V 930 6128 SCREW (T3X6) Q1V1030 12128 SCREW 705LA64FB34044 20"TV BACK COVER ASS'Y E750L 750TVMA1T01 1 CMO 20.1"NORCENT CONSIG HJPFA60A1 HEADPHONE JACK BOARD IRPFF91A3 LCD TV IR BOARD KEPFA60KA11 KEY BOARD 12T 394 3 RUBBER FOOT 15V5939 1...
  • Page 19 NORCENT LT2022 C601 65T0603104 32 CHIP 0.1UF 50V X7R C602 65T0603104 32 CHIP 0.1UF 50V X7R 71T 59B601 EA CHIP BEAD 600OHM 0603 T 71T 59B601 EA CHIP BEAD 600OHM 0603 T R600 61V0603101 CHIPR 100 OHM+-5% 1/10W KEPFA60KA11 SMTKEPFA60KA11...
  • Page 20 NORCENT LT2022 19F25214R0 SPRING 28F0820080 SHAFT 28F0835090 SHAFT CBPFA64KMSE1P SMTFA64KMSE1PS MAIN BOARD 40T 45762412B CBPC LABEL 44T3231508512 CHIELD D-SUB 85T 583510 GASKET CN102 33T802210A H HEADER FEMALE 1*10P R/A CN107 33T3802 8H WAFER 8P RIGHT ANGLE PI CN111 33T3802 3H...
  • Page 21 NORCENT LT2022 C137 65T0603104 12 CHIP 0.1UF 50V X7R C143 65T0603104 12 CHIP 0.1UF 50V X7R C144 65T0603104 12 CHIP 0.1UF 50V X7R C145 65T0603104 12 CHIP 0.1UF 50V X7R C146 65T0603471 32 CHIP 470PF 50V NPO C147 65T0603471 32...
  • Page 22 NORCENT LT2022 C233 65T0603104 12 CHIP 0.1UF 50V X7R C234 65T0603104 12 CHIP 0.1UF 50V X7R C235 65T0603104 12 CHIP 0.1UF 50V X7R C236 65T0603104 12 CHIP 0.1UF 50V X7R C237 65T0603104 12 CHIP 0.1UF 50V X7R C238 65T0603104 12 CHIP 0.1UF 50V X7R...
  • Page 23 NORCENT LT2022 C346 65T0603104 12 CHIP 0.1UF 50V X7R C347 67T 312100 3 SMD EC 10UF 16V 85C B C348 67T 312100 3 SMD EC 10UF 16V 85C B C349 65T0603104 12 CHIP 0.1UF 50V X7R C350 65T0603104 12 CHIP 0.1UF 50V X7R...
  • Page 24 NORCENT LT2022 C500 65T0603822 32 CHIP 8200PF 50V X7R C501 65T0603104 12 CHIP 0.1UF 50V X7R C502 65T0603104 12 CHIP 0.1UF 50V X7R C503 65T0603823 32 CHIP 0.047UF 50V X7R C504 61V0603000 CHIPR 0OHM +-5% 1/10W C505 65T0603474 27 CHIP 0.47UF 25V Y5V...
  • Page 25 NORCENT LT2022 C624 67T 312339 7 SMD EC 3.3 UF 50V 85C C625 67T 312100 3 SMD EC 10UF 16V 85C B C626 67T 312100 3 SMD EC 10UF 16V 85C B C627 67T 312109 7 SMD EC 1UF 50V 85C...
  • Page 26 NORCENT LT2022 C721 67T 312100 3 SMD EC 10UF 16V 85C B C722 65T0603104 12 CHIP 0.1UF 50V X7R C723 65T0603104 12 CHIP 0.1UF 50V X7R C724 65T0603104 12 CHIP 0.1UF 50V X7R C725 65T0603104 12 CHIP 0.1UF 50V X7R...
  • Page 27 NORCENT LT2022 L207 71T 56U601 BEAD 600 OHM L208 71T 56U601 BEAD 600 OHM L301 71T 56U601 BEAD 600 OHM L302 71T 56U601 BEAD 600 OHM L303 71T 56U601 BEAD 600 OHM L304 71T 56U601 BEAD 600 OHM L305 71T 56U601...
  • Page 28 NORCENT LT2022 Q702 57T 417 4 CHIP PMBS3904 BY PHILIP Q703 57T 417 4 CHIP PMBS3904 BY PHILIP 61V0805000 CHIP 0OHM 1/10W 61V0805000 CHIP 0OHM 1/10W R101 61V0603750 9F 75 OHM 1% 1/10W R104 61V0603750 9F 75 OHM 1% 1/10W...
  • Page 29 NORCENT LT2022 61V0805000 CHIP 0OHM 1/10W R300 61V0603000 CHIPR 0OHM +-5% 1/10W R301 71T 59B121 K CHIP BEAD R302 61V0603101 CHIPR 100 OHM+-5% 1/10W R303 61V0603101 CHIPR 100 OHM+-5% 1/10W R304 61V0603101 CHIPR 100 OHM+-5% 1/10W R305 61V0603913 CHIP 91K OHM 1/16W...
  • Page 30 NORCENT LT2022 R360 61V0603103 CHIPR 10K OHM+-5% 1/10W R363 61V0603104 CHIPR 100K OHM+-5% 1/10 R364 61V0603104 CHIPR 100K OHM+-5% 1/10 R365 61V0603104 CHIPR 100K OHM+-5% 1/10 R366 61V0603104 CHIPR 100K OHM+-5% 1/10 R367 61V0603104 CHIPR 100K OHM+-5% 1/10 R370 61V0603302...
  • Page 31 NORCENT LT2022 R622 61V0603152 CHIP 1.5 OHM 1/16W R623 61V0603101 CHIPR 100 OHM+-5% 1/10W R624 61V0603101 CHIPR 100 OHM+-5% 1/10W R625 61V0603103 CHIPR 10K OHM+-5% 1/10W R626 61V0603103 CHIPR 10K OHM+-5% 1/10W R627 61V0603392 CHIP 3.9K OHM 1/10W R628 61V0603102...
  • Page 32 NORCENT LT2022 RN311 61V 125220 8 CHIP ARRAY 22 OHM 1/16W RN312 61V 125220 8 CHIP ARRAY 22 OHM 1/16W RN313 61V 125220 8 CHIP ARRAY 22 OHM 1/16W RN314 61V 125220 8 CHIP ARRAY 22 OHM 1/16W RN315 61V 125220 8...
  • Page 33 NORCENT LT2022 C219 65V 3J1806ET 18PF 5% 3KV TDK C222 65V 3J1806ET 18PF 5% 3KV TDK C901 65V305M2222B3 C-C220P/250V C902 65V305M2222B3 C-C220P/250V C903 63T 107474 HS 0.47UF +-20% 275VAC C904 63T107K224 US 56KOHM 5% 1/6W C905 67T215S15115K EC105C 150UF 450V...
  • Page 34 NORCENT LT2022 C212 65T0805102 31 1000PF 50V NPO C213 65T0805104 22 0.1UF +-10% 25V X7R 080 C214 65T0805334 22 0.33UF+-10% 25V X7R 080 C215 65T0805223 22 CHIP 0.022UF 25V X7R 08 C217 65T0805104 22 0.1UF +-10% 25V X7R 080 C220 65T0805103 22 CHIP 0.01UF 25V X7R 080...
  • Page 35 NORCENT LT2022 D229 93T 39S 24 T RLZ 5.6B LLDS D903 93T 6432P LL4148 BY PANJIT D904 93T 6432P LL4148 BY PANJIT IC101 56T 379 37 FP5001DR-LR IC201 56T 212 6 LM339DT IC203 56T 212 6 LM339DT IC204 56T 212 6...
  • Page 36 NORCENT LT2022 R212 61V0603750 1F RES 7K5 1/10W 1% SMT 06 R213 61V0603392 CHIP 3.9K OHM 1/10W R214 61V1206472 CHIP 4.7KOHM 5% 1/4W R217 61V0603472 CHIP 4.7K OHM 1/16W R219 61V0603180 2F CHIP 18K OHM 1/10W 1% R221 61V0603272 CHIP 2.7KOHM 1/16W...
  • Page 37 NORCENT LT2022 R299 61V0603104 CHIPR 100K OHM+-5% 1/10 R901 61V1206105 CHIP 1MOHM 5% 1/4W R902 61V1206105 CHIP 1MOHM 5% 1/4W R904 61V1206105 CHIP 1MOHM 5% 1/4W R906 61V1206754 CHIP 750KOHM 5% 1/4W R908 61V1206339 CHIP 3.3OHM 1/4W R910 61V0805000 CHIP 0OHM 1/10W...
  • Page 38 NORCENT LT2022 R247 61T 60230352T 30KOHM 5% 1/6W R249 61T 60243252T 4.3K OHM 5% 1/6W R250 61T 60230352T 30KOHM 5% 1/6W R253 61T 60230352T 30KOHM 5% 1/6W R269 61T 17110252T 1K OHM +-2% 1/4W R270 61T 17210152T 100 OHM 5% 1/4W...

  • Page 39: Pcb Layout

    NORCENT LT2022 7. PCB Layout 7.1 Main Board PCB Layout...
  • Page 40 NORCENT LT2022...

  • Page 41: Power Board Pcb Layout

    NORCENT LT2022 7.2 Power Board PCB Layout...
  • Page 42 NORCENT LT2022...

  • Page 43: Block Diagram

    NORCENT LT2022 8. Block Diagram 8.1 Main board GTL5640L16 24LC16 PHILIPS SDRAM EEPROM FQ1236/F-H3 Tuner AT29LV040A 20 inch Flash ROM Panel NJM2244 Selector VIDEO 1 SPV301A Key PAD VIDEO 2 Scaler VPC 3230 Decoder S-VIDEO Y/Pb/Pr Inverter M61323 Selector 12V/5V...

  • Page 44: Power Board

    NORCENT LT2022 8.2 Power board IC101, Rectifier Q101 AC input Bridge Rectifier CMOS Transformer EMI filter and Filter CN902 Start Circuit MOSFET ON/OFF R906, R907 Q901 BL ADJ Voltage Feedback Circuit Over Control IC Voltage Protect ROYER MOSFET ON/OFF Control IC...

  • Page 45: Schematic Diagram

    NORCENT LT2022 9. Schematic Diagram 9.1 Main Board Schematic Diagram CN101 C137 CN111 L139 0.1uF C170 NC L113 300 OHM 600 OHM Audio_L+ L115 0.1uF 300 OHM L114 CONN Audio_L- C167 NC 10uF/16V L116 300 OHM L118 Audio_R+ CN112 300 OHM...
  • Page 46 NORCENT LT2022 RN101 1/16W C114 AGND 0.22uF R108 C111 C112 C113 1/16W U102 100pF 100pF 100pF C161 10uF/16V L148 120 OHM VIN1 VOUT CVBS_SEL_O 15 L108 600 OHM VIN2 C116 C115 AV_1 VIN3 0.22uF 10uF/16V AV2_R_1 L149 120 OHM AV2_R...
  • Page 47 NORCENT LT2022 TUNER ANT_Cable TU100 L101 L102 L103 C101 600 OHM 600 OHM 600 OHM 47pF AGND 1 2 3 4 5 6 R132 1/16W R101 4,5,6,9,11,14,15 TUNER_SIF 1/16W R133 1/16W C102 12V_T 4,5,6,9,11,14,15 47pF C181 C182 100pF 100pF AGND...
  • Page 48 NORCENT LT2022 R201 1/16W VD_VS R202 1/16W VD_HS 6,14 C201 R203 1/16W VD_VREF 3.3pF R204 1/16W VD_Field 1/16W RP201 X200 C202 20.25MHz 3.3pF RP202 VIN2:With Comb Filter VDDI L201 1/16W C[0..7] (3D_Y)/Without Comb 150 OHM Filter (CVBS) C203 SVIDEO_C U200 L200 0.001uF...
  • Page 49 NORCENT LT2022 3.3VM RN300 22 U300D SPV301A 1/16W U302 MDR0 U300B SPV301A MDR1 CPUP00 C364 MAR0 MDR0 MDR2 SW300 HWRST CPUP01 MAR1 MDR1 MDR3 CPUP02 10uF/16V AC21 MAR2 MDR2 EXTMCLK CPUP03 MAR3 MDR3 EXTDCLK CPUP04 MAR4 MDR4 EOSDCLK RN307 22...
  • Page 50 NORCENT LT2022 near IC U300A COAST C390 C389 C388 C387 CLK_ADC R363 100K 1/16W 22pF AD_CLK CLKA HS_ADC U300C 22pF 22pF 22pF near IC AD_HS CLAMP AD_Clamp VS_ADC R364 SPV301A AD_VS CVS_COAST 100K 1/16W U300E R367 PCK1 R301 P_CLK 120 OHM...
  • Page 51 NORCENT LT2022 3.3VM 3.3VM C301 0.1uF C302 0.1uF U2.AA23 U2.D14 C303 0.1uF C304 0.1uF C305 0.1uF U2.AC9 U2.M4 C306 0.1uF C307 0.1uF C308 0.1uF C309 0.1uF U2.AC10 U2.M23 C310 0.1uF C311 0.1uF C312 0.1uF C313 0.1uF U2.AC18 U2.N4 C314 0.1uF C315 0.1uF...
  • Page 52 NORCENT LT2022 3.3VA L501 C501 600 OHM 3.3V_AP 0.1uF 3.3V_AP R501 R502 AGND L502 2.7K 1/16W 1/16W 600 OHM VSEL_VS 3.3V_AD C503 C500 L503 AD_Clamp VSEL_HS 0.0082uF 0.082uF 600 OHM R503 R504 3.3VDD C536 C504 1/16W 1/16W 3.3V_AD 3.3VDD C502 33pF 0.1uF...
  • Page 53 NORCENT LT2022 R609 R610 1/16W 1/16W L600 CN601 C632 600 OHM Comp_L Comp_L_1 PC_L 10uF/16V L604 C633 600 OHM Comp_R Comp_R_1 PC_R PC_AUDIO 10uF/16V R654 4.7K 1/16W R655 L605 R612 R611 C634 600 OHM 4.7K 1/16W 4.7K 1/16W 4.7K 1/16W...
  • Page 54 NORCENT LT2022 TUNER_SIF 5V_A 5V_A 5V_A C601 C604 C602 C603 L601 3.3pF 56pF 3.3pF 56pF 600 OHM C661 C660 X600 L602 0.1uF 18.432MHz 10uF/16V 600 OHM C607 C606 C605 0.0015uF 470pF 100uF/16V R601 1/16W ASEL_O_R R602 R603 C609 1/16W 1/16W...
  • Page 55 NORCENT LT2022 +5VP L701 AGND 5VP : From Power Supply 5V C725 L702 0.1uF U701 3.3VS 600 OHM 12VP : From Power Supply12V AGND 8V :FOR MSP3455G/M62438/uPD64038 C702 R701 5V : For Tuner/VPC3230D/MSP3455G/ Q701 0.1uF 1/16W TVP5150/PT2308/PT2314/Z86129/uPD640 C701 C703 C704...
  • Page 56 NORCENT LT2022 3.3VM L802 600 OHM L800 600 OHM 3.3VM L801 L803 600 OHM C801 C802 C803 0.1uF 0.1uF 0.1uF U802 PAN_PWR C800 C805 C804 0.1uF 0.1uF 10uF/16V P_CLK C806 10uF/16V LM3940S-3.3 1 9 2 C807 C809 CLKIN 0.1uF R[0..7]...
  • Page 57 NORCENT LT2022 NC L403 82uH R416 1/10W R402 R401 L404 NC 1/16W 1/16W L401 600 OHM 600 OHM C401 Q401 R404 C411 VD_VOUT PMBS3904 1/16W C415 C404 NC C406 NC R403 C405 47uF/16V 10uF/16V 1/16W 10uF/16V 0.1uF 10uF/16V 0.1uF L402 C402 0.1uF...
  • Page 58 NORCENT LT2022 R910 C916 1/16W R906 R907 1/2W 1/16W 0.1uF/16V R911 R909 3D_C 1/16W R912 Q902 Q903 1/16W C917 R908 2SA1037AK 2SA1037AK Q901 4.7K 1/16W R913 AGND 0.1uF/16V 2SA1037AK D900 R914 R916 4.7K 1/16W 1/16W 1N4148W 5.6K 1/16W C918 Q904...

  • Page 59: Power Board Schematic Diagram

    NORCENT LT2022 9.2 Power Board Schematic Diagram R919 47_1/2W_M R920 C913 47_1/2W_M 102P_500V 5Vout D910 F902 MOSPEC20100 5A/24V/1206 12Vout L903 T901 73L-253-91L TO INVERTER PQ26/22.5 FB902 BD901 R906 R904 C906 R903 GBU405 1M(1206) 1M(1206) 152P/1KV 100K_2W C916 TO AUDIO D911...
  • Page 60 NORCENT LT2022 5Vout L101 Q101 FB101 22UH BEAD C101 D101 D102 C106 C107 0.1UF 1000uF/16V SI4431DY -T1 SR24 SR24 1000uF/16V R101 C103 10NF C105 100PF(NPO) LM3485 C104 PGATE IC102 R102 R103 60KF PWR GND C102 20KF 0.1UF Isense MINI SO8...
  • Page 61 NORCENT LT2022 CN201 C201 27P/3KV Q201 SI4431 OR AO4411 R201 4.7K Q202 12Vout SST3904 L201 D201 Q203 C202 0.01UF 150UH(60-52) CN203 1000UF/25V 1000UF/25V C205 DT A144WKA C203 C204 C245 C246 Q204 0.1UF 0.1UF PT 201 R207 R208 RLZ8.2B 27P/3KV D202...
  • Page 62 NORCENT LT2022 +12VCC V_REF R298 V_SENSOR_4 D221 1N4148 V_SENSOR_1 R256 D222 1N4148 300K R299 R254 R255 V_SENSOR_5 R293 300K V_SENSOR_2 R257 D224 1N4148 D225 1N4148 Q217 300K D223 R291 R294 300K V_SENSOR_3 V_SENSOR_6 1N4148 680K D226 1N4148 D227 1N4148 R296...

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