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Norcent LT2722, Service Manual

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Norcent LT2722 Service Manual Download Page 25

Norcent LT2722

 

 

24

PC Control Block 

 

No Display 

Check U403 output 
relative circuit and panel 
control circuit 

Check U403 crystal 
X400 (14.318MHZ) 

Check CN605, FPC 
cable and panel 

Replace X400

 

Check power supply for
1.8V, 2.5V, and 3.3V

 

Check relative circuit

 

Check CN300 Pin1, 2, 
3 (R, G, B) and Pin13, 
14(HS, VS)

 

Check relative circuit

 

Replace U403

 

NG

NG

NG

NG

OK

 

OK

 

OK

 

OK

 

OK

 

Summary of Contents for LT2722

Page 1: ...HESE 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 O...

Page 2: ...Norcent LT2722 1 Revision List Version Release Date Revision History Model Name A00 Jan 09 2006 Initial Release EF84MGNKB2NCTMC...

Page 3: ...cification 13 3 1 Input Signal connector 13 3 2 Factory Preset Display Modes 14 4 Mechanical Instructions 15 5 Repair Flow Chart 21 6 White Balance Luminance Adjustment 26 7 BOM List 28 8 PCB Layout 5...

Page 4: ...ent YCbCr x 1 Audio channel L R x 1 Video Inputs HDTV YPbPr x 1 Audio channel L R x 1 Signal Input Analog D Sub 15 pin detachable cable PnP compatibility DDC2B Input frequency Analog FH 31 5 KHz to 80...

Page 5: ...Display Channel number on the right top corner MTS Press this key to activate Multichannel Television Sound Stereo or Mono sound PRE CH To display the previously selected TV channel TV VIDEO Select yo...

Page 6: ...bar display under the menu to assist in the operation of this equipment MAIN MENU Press the MENU button into the main OSD On Screen Display Adjust item include PICTURE PARAMETERS PC PARAMETERS AUDIO...

Page 7: ...st the time PHASE Adjust the phase of the graphic POSITION Adjust the position and angle of the graphic AUDIO SETTINGS BASS Adjust bass tone TREBLE Adjust treble tone SRS Switch SRS surround sound ON...

Page 8: ...he PIP off OFF or select the size SMALL MEDIUM LARGE of the PIP Can also be used to select one of two types POP PBP of dual graphics CHANNEL SETTINGS SYSTEM Used to choose between ANTENNA or CABLE CHA...

Page 9: ...w the instructions on the screen Once changed please remember your own password If you have forgotten your password please do the following POWER OFF MENU V CHIP MUTE to revert to the default password...

Page 10: ...he language English French or Spanish for the menu OSD LOCK Lock the selected configurations to prevent them from being overwritten SLEEP TIMER Configure the time for sleep mode INFORMATIONS Display t...

Page 11: ...to correct the interference by one or more of the following measures 1 Reorient or relocate the receiving antenna 2 Increase the separation between the equipment and receiver 3 Connect the equipment...

Page 12: ...ed to your home consult your dealer or local power company 14 Unplug this apparatus during lightning storms or when unused for long periods of time 15 Refer all servicing to qualified service personne...

Page 13: ...ing of the lead in wire to an antenna discharge unit size of grounding connectors location of antenna discharge unit connection to grounding electrodes and requirements for the grounding electrode See...

Page 14: ...unding The connector information is as follow 1 6 11 15 5 10 15 Pin Color Display Signal Cable Pin No Description Pin No Description 1 Red Video 9 No Pin 2 Green Video 10 Sync Ground 3 Blue Video 11 N...

Page 15: ...rtical Resolution Nominal Frequency KHz Sync Polarity Nominal Freq Hz Sync Polarity 720x400 31 5 N 70 1 P 640x480 31 5 N 59 9 N 640x480 37 9 N 72 8 N 640x480 37 5 N 75 N 800x600 37 9 P 60 3 P 800x600...

Page 16: ...722 15 4 Mechanical Instructions Step Figure Description Preparation Lay the LCD TV on a flat soft and clean surface Remove hinge cover Remove the hinge cover as the arrowheads Remove base Remove the...

Page 17: ...Norcent LT2722 16 Remove cover cable Push the clip as the arrowheads Remove back cover Remove the six screws Remove cover chin Remove the six screws...

Page 18: ...Norcent LT2722 17 Remove shield Remove the total six screws Remove main board Remove the four scres and disconnect he wire harnesses...

Page 19: ...2722 18 Remove power board Remove the six screws and disconnect the wire harness Remove main frame Remove the fourteen screws Remove speakers and bezel Remove the sixteen screws the left and right two...

Page 20: ...Norcent LT2722 19 Remove panel Remove the four screws...

Page 21: ...Norcent LT2722 20 Remove the four screws The end...

Page 22: ...ble to panel Replace Q401 Q400 Check U403 crystal X400 14 318MHZ Replace X400 Check power supply for 1 8V 2 5V and 3 3V Check relative circuit Replace U403 OK OK OK OK NO 5V NO Signal NG NG Check CN60...

Page 23: ...o Power Check CN606 Pin 3 4 12V Pin 5 6 5V Check Power Board circuit Check U701 input 5V U706 input 12V Check Q701 Q702 and PWR_ON control relative circuit U704 Pin2 8V U700 Pin2 1 8V U705 Pin2 2 5V U...

Page 24: ...main board or U403 Check U403 and relative circuit Replace keyboard NG NG OK Remote Control can t work Check IR Board J1 Pin 1 4 5V and voltage at Pin 3 will change when received signal Replace D600...

Page 25: ...and panel control circuit Check U403 crystal X400 14 318MHZ Check CN605 FPC cable and panel Replace X400 Check power supply for 1 8V 2 5V and 3 3V Check relative circuit Check CN300 Pin1 2 3 R G B an...

Page 26: ...604 output relative circuit and power supply 24V Check CN602 Pin3 4 and Pin1 2 are short when no ear phone plug Check earphone board Check U200 U105 output relative circuit Check TUNER Pin11 to U105 r...

Page 27: ...ALER Adjustment CO BR Contrast and Brightness adjust RG GG BG R G B Gain adjust RB GB BB R G B Bias adjust S9 S6 ST SH Save 9300 6500 TV AV S Video 480i Component 480P color temperature R9 R6 RT RH Re...

Page 28: ...C Adjust Video color temperature 1 Switch the chroma 7120 to RGB mode with press MODE button 2 Switch the MEM Channel to Channel 03 with up or down arrow on Chroma 7120 3 The LCD indicator on chroma...

Page 29: ...1 PIZZA BOX 1 PCS 45T 76 28 RN PE BAG FOR MANUAL 1 PCS 45T 88606 3 PE BAG FOR BASE 1 PCS 45T 88609 9 DE BAG 1 PCS 45T 88609 15 EPE COVER FOR BASE 1 PCS 45T 88626 5 PE BAG FOR MOUITOR 1 PCS 50T 500 1 C...

Page 30: ...4 65T306M1022BM Y1 CAP 001UF 250VAC MUR 1 PCS C915 65T306M1022BM Y1 CAP 001UF 250VAC MUR 1 PCS C970 65T306M2222BP Y1 CAP 0022UF 250V AC 1 PCS C907 67T 40K18116K 105C EC SHAP IN 1 PCS C930 67T215L102 6...

Page 31: ...OHM 1 10W 1 1 PCS R960 61V0805133 CHIPR 13KOHM 5 1 8W 1 PCS R961 61V0805152 CHIPR 1 5K OHM 5 1 8 1 PCS R914 61V0805191 2F 19 1K OHM 1 8W 1 1 PCS R957 61V0805200 9F CHIP 20 OHM 1 10W 1 1 PCS R958 61V0...

Page 32: ...S C953 65T0805104 32 CHIP 0 1U 50V X7R 1 PCS C956 65T0805104 32 CHIP 0 1U 50V X7R 1 PCS C965 65T0805104 32 CHIP 0 1U 50V X7R 1 PCS C959 65T0805334 22 0 33UF 10 25V X7R 080 1 PCS C946 65T0805471 31 CHI...

Page 33: ...5 11MM 1 PCS C944 67T 2154707NT 47UF 50V NCC 5 11MM 1 PCS C945 67T 2154707NT 47UF 50V NCC 5 11MM 1 PCS DC1205A3SMT DC TO DC BOARD FOR SMT 1 PCS CN801 33T800913Z H PIN HEADER 1 13 R A 1 PCS C806 67T215...

Page 34: ...0 64 22 OHM 5 2W 1 PCS R144 61T152M220 64 22 OHM 5 2W 1 PCS R145 61T152M220 64 22 OHM 5 2W 1 PCS R146 61T152M220 64 22 OHM 5 2W 1 PCS C609 64T176J104 0T 0 1UF 5 50 63V 1 PCS C610 64T176J104 0T 0 1UF 5...

Page 35: ...U404 56T4LVC 14 P 74LVC14ADT 1 PCS U403 56V 562 67 GM1501 BD 1 PCS U200 56V 593 6 M62438FP SOP 10 1 PCS Q117 57T 417 4 CHIP PMBS3904 BY PHILIP 1 PCS Q201 57T 417 4 CHIP PMBS3904 BY PHILIP 1 PCS Q401 5...

Page 36: ...16 1 PCS PR602 61V 125473 8 CHIP ARRAY 47K OHM 1 16 1 PCS PR603 61V 125473 8 CHIP ARRAY 47K OHM 1 16 1 PCS PR604 61V 125473 8 CHIP ARRAY 47K OHM 1 16 1 PCS PR605 61V 125473 8 CHIP ARRAY 47K OHM 1 16...

Page 37: ...1 PCS R227 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R229 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R232 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R233 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R238 61V0603102 CHIPR...

Page 38: ...1 5 OHM 1 16W 1 PCS R150 61V0603182 CHIP 1 8K OHM 1 16W 1 PCS R237 61V0603182 CHIP 1 8K OHM 1 16W 1 PCS R319 61V0603220 CHIPR 22 OHM 5 1 10W 1 PCS R320 61V0603220 CHIPR 22 OHM 5 1 10W 1 PCS R321 61V0...

Page 39: ...4 7K OHM 1 16W 1 PCS R113 61V0603472 CHIP 4 7K OHM 1 16W 1 PCS R135 61V0603472 CHIP 4 7K OHM 1 16W 1 PCS R210 61V0603472 CHIP 4 7K OHM 1 16W 1 PCS R301 61V0603472 CHIP 4 7K OHM 1 16W 1 PCS R302 61V06...

Page 40: ...616 61V0603912 CHIP 9 1K OHM 1 16W 1 PCS R617 61V0603912 CHIP 9 1K OHM 1 16W 1 PCS L405 61V1206000 CHIP 0 OHM 1 8W 1 PCS R108 61V1206471 CHIP 470OHM 1 8W 1 PCS R132 61V1206471 CHIP 470OHM 1 8W 1 PCS R...

Page 41: ...454 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C455 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C456 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C457 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C458 65T0603104 12 CHIP 0...

Page 42: ...198 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C211 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C212 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C214 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C218 65T0603104 32 CHIP 0...

Page 43: ...414 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C415 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C416 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C514 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C515 65T0603104 32 CHIP 0...

Page 44: ...146 65T0603104 37 CHIP 0 1UF 50V Y5V 1 PCS C147 65T0603104 37 CHIP 0 1UF 50V Y5V 1 PCS C148 65T0603104 37 CHIP 0 1UF 50V Y5V 1 PCS C149 65T0603104 37 CHIP 0 1UF 50V Y5V 1 PCS C150 65T0603104 37 CHIP 0...

Page 45: ...5T0603471 31 CHIP 470PF 50V NPO 1 PCS C619 65T0603471 31 CHIP 470PF 50V NPO 1 PCS C620 65T0603471 31 CHIP 470PF 50V NPO 1 PCS C623 65T0603471 31 CHIP 470PF 50V NPO 1 PCS C624 65T0603471 31 CHIP 470PF...

Page 46: ...1UF 50V Y5V 1 PCS C110 65T0805473 32 CHIP 0 04IF 50V X7R 1 PCS C231 65T0805473 32 CHIP 0 04IF 50V X7R 1 PCS CP601 65V600M471 8T CHIP ARRAY 470PF 8P 1 PCS CP608 65V600M471 8T CHIP ARRAY 470PF 8P 1 PCS...

Page 47: ...C737 67T 312100 3 SMD EC 10UF 16V 85C B 1 PCS C739 67T 312100 3 SMD EC 10UF 16V 85C B 1 PCS C740 67T 312100 3 SMD EC 10UF 16V 85C B 1 PCS C741 67T 312100 3 SMD EC 10UF 16V 85C B 1 PCS C744 67T 312100...

Page 48: ...3 SMD EC 47UF 16V 85C D 1 PCS C720 67T 312470 3 SMD EC 47UF 16V 85C D 1 PCS C727 67T 312470 3 SMD EC 47UF 16V 85C D 1 PCS C733 67T 312470 3 SMD EC 47UF 16V 85C D 1 PCS C213 67T 312479 3 SMD EC 4 7UF...

Page 49: ...PCS L657 71T 57G601 BEAD 1206 600 OHM 1 PCS L700 71T 57G601 BEAD 1206 600 OHM 1 PCS L701 71T 57G601 BEAD 1206 600 OHM 1 PCS L702 71T 57G601 BEAD 1206 600 OHM 1 PCS L704 71T 57G601 BEAD 1206 600 OHM 1...

Page 50: ...1 PCS 33V4659 1 C LENS REMOTE 1 PCS 34T1302 GM 5A REAR COVER 1 PCS 34T1402HGN20A BEZEL 27 S2 A2 1 PCS 34T1404 GM A COVER CHIN2 1 PCS 34T1432 GN L STAND 2 1 PCS 34V1307 GN L COVER STAND F 1 PCS 34V130...

Page 51: ...0 1GCJ TACT SWITCH TSPB 2 NP 1 PCS S605 77T 600 1GCJ TACT SWITCH TSPB 2 NP 1 PCS S606 77T 600 1GCJ TACT SWITCH TSPB 2 NP 1 PCS TP600 95T 900576 HARNESS 1 PCS R605 61V0603100 2F 10K 1 1 10W 1 PCS R610...

Page 52: ...Norcent LT2722 51 8 PCB Layout 8 1 Main Board...

Page 53: ...Norcent LT2722 52...

Page 54: ...Norcent LT2722 53...

Page 55: ...Norcent LT2722 54...

Page 56: ...Norcent LT2722 55 8 2 Power Board...

Page 57: ...Norcent LT2722 56...

Page 58: ...Norcent LT2722 57 8 3 Key IR Board...

Page 59: ...Norcent LT2722 58 8 4 Earphone Board...

Page 60: ...Decoder 74HC4052D 74HC4052D TV audio SIF YCrCb Audio YPrPb Audio Audio 1 Audio 2 PC Audio NOTE AV2 and S VIDCO USE the same Audio Input Speaker 5W x 2 Power Genesis 1501 Scalar OSD ADC LVDS MCU 27 in...

Page 61: ...Norcent LT2722 60 9 2 Power Board...

Page 62: ...Norcent LT2722 61 9 3 Exploded View...

Page 63: ...A CONTENTS B 1 12 Thursday October 20 2005 Title Size Document Number Rev Date Sheet of 6 11 11 Audio 01 Contents Revision History Johnny 8 Author 12 9 Draft Release 08 GM1501 1601 10 04 VPC3230D 2 06...

Page 64: ...C 0 1uF L111 600 OHM C155 0 1uF R178 100 1 16W C170 47pF C156 100uF 16V R144 22 2W R172 33 1 16W SOURCE_L2 11 C183 2 2uF 16V U105 MSP3425G 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 2...

Page 65: ...2 3 4 6 U102 AIC1117 33CY 3 2 1 VI VO GND L101 600 OHM D25 R127 10K 1 16W C114 0 1uF A12V To 3230D L100 5 6uH C134 47uF 16V R141 220 1 16W D33 C150 0 1uF R139 10 1 16W C112 560pF C146 0 1uF R147 470 1...

Page 66: ...3 22 23 24 26 38 51 27 28 29 30 33 43 53 35 34 52 63 58 36 32 31 8 9 10 12 14 17 19 21 25 37 39 40 41 42 44 45 46 47 48 49 50 57 56 55 54 62 61 60 59 67 66 65 64 68 72 71 70 69 73 74 75 76 77 79 78 80...

Page 67: ...11 12 13 14 15 16 17 18 1 2 3 4 5 6 7 8 9 RREF VSS_A VDD VIN INTRO SDA SCK SDO BOX RED VSS GREEN BLUE SEN HIN SMS VIDEO CSYNC LPF R215 470 1 16W SRS R207 31 6K 1 16W FB 4 C208 0 0047uF C216 0 068uF T...

Page 68: ...4 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80...

Page 69: ...F C304 10uF 16V C315 10uF 16V R312 75 1 16W GREEN R305 75 1 16W D304 BAV99 1 2 3 C307 NC 5VD_AVIE GREEN 8 C310 47pF VGA_RIN L302 0 1 16W VGA_VIN ZD300 MLL752A R310 150 1 16W R301 4 7K 1 16W SCALER_AVS...

Page 70: ..._CONNECT RXC RXC RX2 RX2 RX1 RX1 RX0 RX0 REXT LBADC_IN1 LBADC_IN2 LBADC_IN3 NO_CONNECT BLUE BLUE GREEN GREEN RED RED SOG NO_CONNECT TCLK XTAL NO_CONNECT ACS_RSET_HD GPIO_G06_B0 GPIO_G06_B1 GPIO_G06_B2...

Page 71: ...CMADDR11 OCMDATA5 C514 0 1uF FSDATA 0 31 8 19 LOW 2 5V_DDR OCMADDR4 FSADDR10 FSCLK 2 5V_DDR1 R405 10K 1 16W C521 0 1uF OCMADDR15 OCMADDR14 Serial_Interface_Debug2 3 3V_DIG1 OCM_RE C404 0 1uF BOOTSTRAP...

Page 72: ...70pF 5VP C678 68pF Comp_L 11 ACK 8 DAT 8 CN600 CONN 1 2 3 4 5 6 7 8 9 10 C673 470pF DVD_R L638 120 OHM C669 470pF Rin1 8 C657 68pF VGA_SDA 7 8 L643 120 OHM L609 600 OHM Audio_R 11 VGA_SCL L627 150 OHM...

Page 73: ...HDTV_L 10 R617 3 9K 1 16W AUDIO_SL1 1 24V AV1R C695 0 0056uF X R619 100K 1 16W AUDIO_SL2 C632 100uF 16V R623 1K 1 16W L637 600 OHM 5VA 5VD SOURCE_R2 2 R606 100K 1 16W C620 470pF R625 100K 1 16W X D60...

Page 74: ...16V C727 47uF 16V 3 3VA L700 600 OHM L706 600 OHM C700 0 001uF L712 600 OHM 3 3V_ADC 3 3V_PLL 3 3V_DVI For GM1601 Q701 AO4403 1 2 3 4 8 7 6 5 S1 S1 S1 G1 D1 D1 D1 D1 L711 600 OHM R703 3K 1 16W Q703 P...

Page 75: ...PC123FY2 4P 1 2 4 3 Q943 IRFB3415 R918 N C R960 13K 1 10W C925 50V_47uF C955 470uF 35V C936 0 01uF 50V R910 10K 1 10W P1 1 Q946 2SA733P C911 0 001uF ZD902 RLZ20B C912 0 47uF 25V C913 0 01U R904 47 1 1...

Page 76: ...uH C806 470uF 10V C803 1000PF C810 1000PF R804 22 1 4W R801 36K 1 16W D801 SSM54 Q801 AO4411 1 2 3 4 8 7 6 5 S1 S1 S1 G1 D1 D1 D1 D1 C805 470P R802 62K 1 16W C801 220uF 25V C807 470uF 10V 5V 2 5A CN80...

Page 77: ...E_Sel S603 VOL_UP S604 VOL_Down R607 5 1K CN600 CONN 1 2 3 4 5 D601 LED R603 5 1K C603 0 1uF 5VP R604 15K R605 10K C602 100uF 16V CN600 CONN 1 2 3 4 5 R609 100 1 16W D600 1 3 2 DATA VCC GND FOR EMI R6...

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