DiBoss LT-32HLFH Service Manual Download

Page: 12 / 73

SERVICE MANUAL

TROUBLE SHOOTING

Check
P803 (8~12) : 24V?
P804 (6~10) : 24V

Replace LCD Panel.
(If possible, replace
inverter module.)

Check
Q804 (3) : 24V?

Check
P303 (25~27) : 5V?

Check
Q804 (3) : 24V?
Q804 (1) : 0V?

Replace
SMPS

Replace

Q800

Replace
Q804

Check
IC805 (3) : 5V?
IC805 (4)

: 0V?

Replace
IC805

Check
IC821 (3) : 5V?
IC821 (4)

: 0V?

Replace
IC821

Replace
IC804

No Raster

Summary of Contents for LT-32HLFH

Page 1: ...SERVICE MANUAL COLOR TFT LCD TV SERVICE MANUAL MODEL LT 32HLFH CAUTION BEFORE SERVICING THE TFT LCD TV READ THE SAFETY PRECAUTIONS IN THIS MANUAL...

Page 2: ...tions 5 Location of control 9 Trouble Shooting 12 Deassembly procedure 14 Exploded Drawing 19 Wire dressing 21 Adjustment instruction with Default Factory Data 22 Inspection instruction 24 PCB Layout...

Page 3: ...metallic part Any voltage measured must not exceed 0 75 volt RMS which is corresponds to 0 5mA In case any measurement is out of the limits specified there is possibility of shock hazard and the set...

Page 4: ...ply heatsink in this receiver Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostati...

Page 5: ...s 18AWG for AC 220 240V area 3 Tuning system FVS 100 Program 4 Sound output 10W 10Wrms Stereo Max 5 Antenna input impedance VHF UHF at 75ohm 6 OSD Type On Screen Display Windows type Center 7 External...

Page 6: ...CAM G 8 SECAM D 9 SECAM K 10 SECAM K1 11 SECAM I 6 0 12 NTSC 3 58 4 5 X 13 NTSC 3 58 5 5 X 14 NTSC 3 58 6 0 X 15 NTSC 3 58 6 5 X 16 NTSC 3 58 4 5 5 0 X 17 NTSC 4 43 5 5 X 18 NTSC 4 43 6 0 X 19 NTSC 4...

Page 7: ...mal there is nothing wrong with the set If possible use the XGA 1024 x 768 60HZ video mode to obtain the best image quality for your LCD monitor If used under the other resolutions some scaled or proc...

Page 8: ...atterned Vertical Align mode Wide verwing anale 170 High speed response WXGA 1366 X 768 pixels resolution 16 9 Low Power consumption Dyrect Type 16 CCFL Cold Cathode Fluorescent Lamp DE only mode LVDS...

Page 9: ...DEO RADIO Only when the set is Radio On COMPONENT PC ANALOG HDMI mode Clears the menu from the screen 5 MENU Displays a main menu 6 LIST Displays the programme list menu 7 I II Selects the language du...

Page 10: ...T buttons These buttons are used for Teletext For further details see the Teletext section 18 INPUT Selects the AV source of sub picture in PIP mode 19 PIP Displays a PIP Picture In Picture screen 20...

Page 11: ...olume Up Down Adjusts the volume Adjusts menu settings 5 TV AV Selects input signal source Clears the menu from the screen 6 POWER INDICATOR Illuminates red when the TV is in power standby mode Illumi...

Page 12: ...Panel If possible replace inverter module Y Check Q804 3 24V N Check P303 25 27 5V Y Check Q804 3 24V Q804 1 0V N Replace SMPS Replace Q800 Replace Q804 Check IC805 3 5V IC805 4 0V Replace IC805 Y Y...

Page 13: ...e ZD601 N IC101 123 124 L R Q104 105 E Sound Wave N Replace IC101 N Y IC202 10 0V Replace IC202 N No LED LED blinking Resistance 0 IC804 4 GND Y Replace IC804 D850 Y Check All SCL SDA TTL Level Y IC01...

Page 14: ...SERVICE MANUAL DEASSEMBLY PROCEDURE 1 Disassembly procedure 1 Back cover Remove 4 screws Remove 16crews Removal of Backcover...

Page 15: ...SERVICE MANUAL DEASSEMBLY PROCEDURE 2 Metal plate Rear chassis Remove 5 screws Removal of rear metal chassis Remove 2 screws Slide away the metal plate...

Page 16: ...SERVICE MANUAL DEASSEMBLY PROCEDURE 3 Metal plate Rear chassis Remove Main PCB 10 screws Removal of Main PCB Remove 6 connector...

Page 17: ...SERVICE MANUAL DEASSEMBLY PROCEDURE 4 LCD Panel chassis Remove 22 screws then take LCD BRKT Removal of LCD Module take LCD BRKT Removal of LCD Module...

Page 18: ...SERVICE MANUAL DEASSEMBLY PROCEDURE 5 LCD Module Remove 8 screws then take LCD BRKT Front mask remains after removing LCD Module...

Page 19: ...7 401 0032 BOTTOM BRKT EGI 1 18 450 001Y DECO STAND PMMA BLACK 1 19 450 004F G H REAR PLATE PVC BLACK 1 20 402 004W STAND BOTTOM ABS SILVER 1 21 402 004C STAND FRONT ABS DARK GRAY 1 22 401 0016 STAND...

Page 20: ...SERVICE MANUAL WIRE DRESSING 1 Wire Dressing Note Using acetate Using Copper Conducted tape Using Ferrite Cpre Using Copper Tape Using Conducted tape Using Ferrite Cpre...

Page 21: ...erring to Table below with the VOL key 4 Press TV AV button to exit SVC mode 1 1 Factory outgoing setting Initialize with default data into the SVC mode Main menu Change value Sub menu Change value Mo...

Page 22: ...10K 2 MODEL L 4 PC Pattern Generator 1024 x 768 60Hz Pattern Generator MSPG 3420 5 Setting All 6 Setting All Start Click 7 PC White Balance Setting 8 White Balance Setting Verify 3 Language Option EU...

Page 23: ...SERVICE MANUAL INSPECTION INSTRUCTION 1 Supplied Accessories Note Make Sure the following accessories are provided with Product...

Page 24: ...T BOX FRONT SET BOX FRONT INSPECTION INSTRUCTION 2 Packing condition BOX FRONT SET FRONT picture2 SET insert in BOX picture 1 PACKING insert in BOX PACKING BOTTOM BOX FRONT SET FRONT SET BACK ACCESSOR...

Page 25: ...1 1 SET Packing Exploded Drawg MA05 006 DRAWING NO TITLE 3 4 NO PART NO DESCRIP TION MATERKAL COLOR Q TY 1 LCD COLOR TV 1 2 321 006A POLY VINLY PE 1 3 310 021A B PACKING BOTTOM L R EPS WHITE 2 4 300...

Page 26: ...SERVICE MANUAL PCB LAYOUT 1 CONTROL PCB 2 Tuner PCB 3 SUB PCB...

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Page 32: ...SCREW 18 1 410 001Q BTB 4 12 SCREW 49 1 410 001R PB 4 8 SCREW 10 1 410 002R PP 4 12 SCREW 4 1 490 001M 7ITS FK10 2 104 13 FORM SHIELD 2 1 490 001R 7ITS FK 6 4 35 13 FORM SHIELD 2 1 490 011C 71TS FK 2...

Page 33: ...VBT SCART BACK COVER ASSY 1 1 AYCALT43A02A 32H HDMI PR NO B Front body 32inch 1 1 AYCOLT40A01A VCTI N F CONTROL CONTROL PCB ASSY 1 1 AYMALT52A01A HD READ_SCART_32 5V MAIN PCB ASSY 1 1 AYSTLT32A01F 30...

Page 34: ...ty Circuit No 1 0CESH471FMBD 470UF 35V 470U 5 C837 C851 C650 C836 C852 1 0ICKE78080AD IC KIA7808 KIA7808AP 1 IC800 1 0ISSY32P00BD DIP 32P AT49F040 1 IC109 1 0JAHDD15S0SD HDD 15S VERTICAL D SUB 15P 1 J...

Page 35: ...C107 C109 C11 C12 C120 C124 C128 C133 C136 C137 C138 C142 C147 C148 C152 C158 C159 C161 C162 C163 C166 C171 C172 C180 C181 C182 C183 C191 C186 C195 C196 C217 C236 C250 C27 C28 C29 C30 C31 C32 C33 C34...

Page 36: ...149 R150 R151 R162 R163 R17 R194 R195 R288 R289 R291 R292 R293 R294 R295 R296 R297 R298 R36 R561 R91 R719 R562 R563 R564 R601 R602 R604 R605 R606 R672 R673 R676 R703 3 0RHSS102DJTS Resistor chip 1K 1K...

Page 37: ...uit No 3 1DZSC5231BTS 5 1V MMSZ5231BS 7 5 1VZ 30 D700 D701 ZD191 ZD192 ZD20 2 ZD204 ZD205 ZD206 ZD210 Z D211 ZD212 ZD213 ZD214 ZD215 Z D216 ZD217 ZD218 ZD219 ZD220 Z D221 ZD222 ZD223 ZD224 ZD225 Z D60...

Page 38: ...rcuit No 1 410 001J SCREW 1 1 420 001F HEAT SINK 1 1 498 001A Silicon Grease 0 15 GRLT51AM001D GR HP RJ45 M I HD READY HP RJ45 PCB SUB LAVEL P N VENDOR P N Description Q ty Circuit No 1 WAFET08250SD W...

Page 39: ...D TV AV IN OUT PAL EU NTSC MULTI HDMI RGB PC RGB RGB FB AV IN OUT AV IN OUT YC IF H D M I P C R G B R G B F B A V I N O U T Y P b P r D T V A V I N O U T Y P b P R D V D Y C I F V C T I R G B H S V S...

Page 40: ...tended to be a finished product Basically a display device mounted inside an enclosure which will provide the safety Requirements With the exception of LCD Panel the display device shall be composed e...

Page 41: ...0 compliant receiver High bandwidth Digital Content Protection HDCP 1 1 compliant receiver High Definition Multimedia Interface HDMI 1 0 compliant receiver with I2S and S PDIF digital audio outputs L...

Page 42: ...scaling engines an on screen display controller and a built in output clock generator By use of external frame buffer PIP POP is provided for multimedia applications It supports de interlaced full sc...

Page 43: ...LVA0P LVA1M LVA1P LVA2M LVA2P LVACKM LVACKP GND VDDP LVA3M LVA3P GND BYPASS GND DVI_R DVI_R GND GND DVI_G DVI_G AVDD_DVI DVI_B DVI_CK AVDD_DVI AVDD_PLL DDCD_DA GND HSYNC1 BIN1P BIN1M DVI_B GND DVI_CK...

Page 44: ...Input w 5V tolerant Analog VSYNC Input from Channel 0 37 BIN0M Analog Input Reference Ground for Analog Blue Input from Channel 0 27 BIN0P Analog Input Analog Blue Input from Channel 0 28 GIN0M Analo...

Page 45: ...DVI Input Clock 9 Video Interface Pin Name Pin Type Function Pin VI_CK Input w 5V tolerant Digital Video Input Clock 66 VI_DATA 15 0 Input w 5V tolerant Digital Video Input Data 15 0 48 41 61 54 Digit...

Page 46: ...l Data Output 186 LVB1M Output B Link Negative LVDS Differential Data Output 181 LVB1P Output B Link Positive LVDS Differential Data Output 180 LVB2M Output B Link Negative LVDS Differential Data Outp...

Page 47: ...130 127 124 117 MDATA 31 0 I O Memory Data 82 85 88 99 135 138 141 152 Misc Interface Pin Name Pin Type Function Pin XIN Crystal Oscillator Input Crystal Oscillator Input 203 XOUT Crystal Oscillator...

Page 48: ...M Interface Power 86 102 113 125 139 154 VDDP 3 3V Power Digital Output Power 66 162 182 VDDC 1 8V Power Digital Core Power 63 79 131 156 173 185 195 GND Ground Ground 1 7 13 16 35 50 64 65 80 87 103...

Page 49: ...1 0 142 D 31 20 1 228 D1 28 00 1 102 D2 25 50 1 004 E 31 20 1 228 E1 28 00 1 102 E2 25 50 1 004 R1 0 13 0 005 R2 0 13 0 30 0 005 0 012 Millimeter Inch Symbol Min Nom Max Min Nom Max 0 7 0 7 1 0 0 2 8...

Page 50: ...uction set compatible CPU Up to 256 kB on chip program ROM WST PDC VPS and WSS acquisition Closed Caption and V chip acquisition Up to 10 pages on chip teletext memory Multi standard QSS IF processing...

Page 51: ...Test Logic I2C Master Slave 24kB Char ROM TEST RESETQ XTAL2 I2C Pxy CVBS in IFIN IFIN TAGC SIF YCrCb in CVBS out RGB in AOUT SPEAKER RGB out SVM RGB in SENSE RSW VERT EW HOUT PROT HFLB Panorama Scale...

Page 52: ...D Sense ADC Input 10 137 GNDM IN GND Reference Ground for Sense ADC 11 138 FBIN IN GND Fast Blank Input Back end 12 139 RIN IN GND Analog Red Input Back end 13 140 GIN IN GND Analog Green Input Back e...

Page 53: ...9 P11 IN OUT LV Port 1 Bit 1 Input Output 42 50 P10 IN OUT LV Port 1 Bit 0 Input Output 43 53 VSUP3 3FE SUPPLY OBL Supply Voltage Analog Video Front end 3 3 V 44 54 GND SUPPLY OBL Ground Platform 45 5...

Page 54: ...VREFIF Differential IF Input 74 111 VREFIF OBL Reference Voltage IF ADC 75 112 TAGC OUT LV Tuner AGC Output 76 113 AIN1R SIF IN OUT GND Analog Audio 1 Input Right Analog 2nd Sound IF Output 77 114 AIN...

Page 55: ...N OUT LV Port 3 Bit 2 Input Output Digital 656 Bus 2 Input Output 79 P31 656IO1 IN OUT LV Port 3 Bit 1 Input Output Digital 656 Bus 1 Input Output 80 P30 656IO0 IN OUT LV Port 3 Bit 0 Input Output Dig...

Page 56: ...Bus 3 Input Output 92 DB4 IN OUT LV Data Bus 4 Input Output 93 DB5 IN OUT LV Data Bus 5 Input Output 94 DB6 IN OUT LV Data Bus 6 Input Output 95 DB7 IN OUT LV Data Bus 7 Input Output 32 RDQ OUT LV Da...

Page 57: ...ble to these pins It is recommended to use more than one capacitor By choosing different values the frequency range of active decoupling can be extended IF Pins VREFIF Reference Voltage for Analog IF...

Page 58: ...7 F in parallel to 100 nF low inductance is required XREF DAC Current Reference Fig 4 20 External reference resistor for DAC output currents typical 10 k to adjust the output current of the D A conver...

Page 59: ...for the control ler ADC P24 P26 P30 P37 I O Port Fig 4 34 These pins provide CPU controlled I O ports ADB0 ADB19 Address Bus Output Fig 4 35 These 20 lines provide the CPU address bus output to access...

Page 60: ...06 107 108 GIN RIN FBIN GNDM BIN SVMOUT RSW2 EW VERT VERT RSW1 SENSE VSUP5 0BE TEST GND GND VREFAU VSUP8 0AU SPEAKERR SPEAKERL AOUT1L AOUT1R AOUT2L AOUT2R AIN3R AIN3L AIN2L AIN2R AIN1L AIN1R SIF TAGC...

Page 61: ...ons F1 and F2 are intended to solve the remaining problems Table 1 1 History of field problems No Field Problem C7 D2 D4 D5 F1 F2 Comment FP01 Streaky Noise x x x x Problem solved in F1 FP02 Modulator...

Page 62: ...D2 Problem solved in F1 workaround available 52 OSD Jitter x x Problem appeared in D2 Problem solved in D5 53 MSP Automatic Standard Detection for EIA J x x x Problem solved in D4 54 MSP Standard Tog...

Page 63: ...68 BSO x x x x x Problem solved in F1 69 H Out Jitter x x x Problem solved in F1 workaround available 70 SCE Luma Input x x x new feature in D2 Problem solved in F1 71 YUV ECO Mode x x x x x Problem s...

Page 64: ...ng adaption doesn t work Thus the peaking signal is limited only hardware redesign D1 D1 40 Bandwidth of Antialias Filter The bandwidth adjustment of the antialias filter 1 6 is disturbed This causes...

Page 65: ...utomatic standard detection fails if EIA J is selected as preferred 4 5MHz sound carrier firmware redesign D4 workaround avoid Mod_4_5MHz 1 0 1 0 If Mod_ASS and Mod_Dis_Std_Chg 1 EIA J is detected any...

Page 66: ...ode for vertical peaking in 4H combfilter allows switching between 2H and 1H peaking filter See new register VPM in section 2 1 2 F1 F20 Fastblank Output The fastblank signal of the TVT display genera...

Page 67: ...eset Range Function Advanced Settings MOD_ACCU_BS 9 0 h10 h100E 10 1 RW 0 512 511 Modulator imbalance value Write set manual imbalance value with MOD_IF 0 MOD_IR 0 for take over set MOD_UPDATE 1 Read...

Page 68: ...also section 2 1 1 4 WP5 2 1 1 3 Status of VCT 49xyI F1 and how to deal with currently used workarounds The following table gives recommendations how to deal with workarounds used at C7 Dx No Problem...

Page 69: ...MOD_If 0 write MOD_ACCU_BS 0 consider also W2 none under inves tigation W2 MOD_ACCU_BS must be written several times until value is accepted Write MOD_ACCU_BS until readback value matches written valu...

Page 70: ...1 70 MINVWIN hB5 15 RW VS_CD 0 0 1 Calculate MINV 0 every line 1 over 4 lines Note set to 0 for standard CVBS and 1 for component input THRELIM hB5 14 RW VS_CD 0 0 1 Limit Threshold to MINV 0 no limit...

Page 71: ...00 sync amplitude and peak white 01 sync amplitude only 10 sync amplitude peak white and peak dark 11 fixed to value AGCADJ1 I2C REV 4 0 hFC 4 0 R 1 2 3 4 5 6 VCTH Revision h01 VCTH 01 01 h02 VCTH 02...

Page 72: ...cessing must be equal to PPLOP ODC PPLOP 11 0 h17 11 0 RW upd_pplop 1296 0 4095 Pixel Per Line Output must be equal to PPLIP BLE MINRED h3E 13 RW VS_DP 0 0 1 Enable Entropy Adaption 0 entropy adaption...

Page 73: ...10 0 RW 1426 0 2047 HSync Period Maximum Table 2 13 Wrongly Documented TVT Registers Name Addr Dir Reset Range Function RTC RTCRW h8F 4 RW 0 0 1 RTC Read Write RTCSUB 3 0 h8F 3 0 RW 0 0 15 RTC Subadd...

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