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Prima LC-27U6 Service Manual

Prima lc-u# serial lcd tv service manual
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LCD TELEVISION
LC-U# serial

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Summary of Contents for Prima LC-27U6

  • Page 1 LCD TELEVISION LC-U# serial...

  • Page 2: Table Of Contents

    CONTENTS Safety instructions………………………………………………………………………..… Adjustment instructions …………………………….…….…………………………….… Trouble shooting ……………………………………………………….…………………… Working principle analysis……………………………………………………….…………. Block diagram…………………………………..……………….……………….………… IC block diagram………………………………………………………………………..…… Main assembly……………………………………………………………………………..… Identification criteria for the bright spot and dark spot of the LCD screen………..…. Wiring diagram ……………………………………………………………..……………... Troubleshooting charts………………………………………………………………..…… Schematic diagram (CPU and TV board) ……………………………………………..…… Schematic diagram (LC-23U7 and LC-27U7 power supply board)………………….…...

  • Page 3: Safety Instructions

    This service manual is only for service personnel to take reference with. Before Attention: servicing please read the following points carefully. Safety instructions 1. Instructions Be sure to switch off the power supply before replacing or welding any components inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will;...
  • Page 4 would be unable to work and no way to get it repaired. 2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling.

  • Page 5: Adjustment Instructions

    Alignment instruction 1 Alignment equipment PM5518 (video signal generator) K-7253 (VGA signal generator) CA210 (white balancer) 2 Alignment flow-chart The alignment flow-chart is shown as fig-1 Check DDC, HDCP KEY and CPU Factory initialization setup IF channel voltage of TV and AGC voltage adjustment Support format of VGA pre-set Adjustment for sub-brightness and white balance of VGA/HDMI (color temperature 6500k, 9300k and 12000k)
  • Page 6 Table1 sub-menu adjustment Items Range Introduce PW on LOGO ON/OFF Display 5s LOGO of turn on the TV NO Sig LOGO ON/OFF If display LOGO in no signal Black Screen BLUE/BLACK If display blue screen and white noise wave in no signal, setting “BLUE”...
  • Page 7 f. Input PROG852(640*480/75Hz) and the eighth level gray-scale of PATTERN signal of VG-849 to HDMI, repeatedly the b-e course. In the HDMI channel, preset value of offset_R, offset_G and offset_B to 15, preset value of gain_R, gain_G and gain_B to 25. 3.4 Adjustment for sub-brightness and white balance of YPbPr channel a.

  • Page 8: Trouble Shooting

    Item Setting Item Setting Item Setting Picture mode NATURE OSD language English Sound mode NORMAL HALFTONE STEREO WEAK DURATION VGA/HDMI NORMAL SCREEN FULL MAG.C ANTENNA CATV Trouble shooting Before servicing please check to find the possible causes of the troubles according to the table below.
  • Page 9 Deterioration of color phase or color Check if all the picture setups have been corrected. tone Screen position or size is not proper Check is the screen position and size is correctly set Picture is twisted and deformed Check to see if the picture-frame ratio is properly set Picture color changed or colorless Check the “Component”...

  • Page 10: Working Principle Analysis

    control so as to enable the liquid crystal TV set to recheck the signal and then to display correct picture signal Working principle analysis RF signal from the antenna to tuner, via high frequency amplifier and mix frequency to obtain IF signal, and then via pre-IF amplifier in V104, then it send to processed IF filter of SAW (Z103), obtain more idea IF speciality, it processed to IF amplifier, phase locked logic VCO and sync detection of N101 (M52760E) in the TV board to obtain VIDEO;...

  • Page 11: Block Diagram

    BLOCK DIAGRAM AV1-A AV2/S-A YPbPr-A AUDIO VGA/DVI-A HDMI-A NA02 AUDIO SIF DEC AUDIO AMP HEF4052 PROCESSOR N201 N401 N301 LA72700 TPA3008D2 R2S15900SP AV OUT Z102 IF AMP TUNER SPEAKER N101(TV) M52760E Z103 HEADPHONE VIDEO VIDEO1 SCALER DECORDER Y/VIDEO2 CCIR656 A/D D/A N601 8bit DEINTERLACER...

  • Page 12: Ic Block Diagram

    IC block diagram TVP5147 Copy CVBS/Y Data Protection Detector Processor Analog Front End VI_1_A Composite and S-Video Processor CVBS/ VI_1_B C/Pb VI_1_C Luma Y[9:0] CVBS/Y Separation Processing Output YCbCr 5-line Formatter VI_2_A Chroma C/CbCr Clamping Adaptive CVBS/ Processing C[9:0] VI_2_B Comb VI_2_C 11-Bit...
  • Page 13 M52760 2: AFT 3: AGC 4, 5: picture If input 7: sound IF input 13: SIF output 10: mono sound output 18: TV- VIDEO output 14, 17: +5V-1 power supply...
  • Page 14 LA72700 5: SIF input 25: TV sound -R output 26: TV sound- L output 11: SDA 12: SCL 31: +9Vpower supply...
  • Page 15 MST6151 207, 208: HDMI-R input 2, 3: HDMI-G input 5, 6: HDMI-B input 8, 9: HDMI-CLK input 14: HDMI-SDA 15: HDMI-SCL 20, 21: VGA-B input 22: VGA-G input 23, 24: VGA-G input 25, 26: VGA-R input 18: VGA H-sync input 19: VGA V-sync input 27, 28: PB input 29, 30: Y input...
  • Page 16 PIN DIAGRAM (MST5151A) VDDC DVI_G+ DVI_G- VDDM Pin 1 AVDD_DVI DQS[0] DVI_B+ MDATA[0] DVI_B- MDATA[1] MDATA[2] DVI_CK+ MDATA[3] DVI_CK- MDATA[4] AVDD_DVI MDATA[5] REXT MDATA[6] MDATA[7] AVDD_PLL MDATA[8] DDCD_DA MDATA[9] DDCD_CK MDATA[10] MDATA[11] AVDD_ADC HSYNC1 VDDM MDATA[12] VYSNC1 BIN1P MDATA[13] BIN1M MDATA[14] MDATA[15] SOGIN1...
  • Page 17 PIN DESCRIPTION MCU Interface Pin Name Pin Type Function HWRESET Schmitt Trigger Input Hardware Reset, active high w/ 5V-tolerant DBUS[3:0] I/O w/ 5V-tolerant MCU 4-bit DDR Direct bus; 4mA driving strength 75-72 I w/ 5V-tolerant MCU Bus ALE, active high I w/ 5V-tolerant MCU Bus RDZ, active high I w/ 5V-tolerant...
  • Page 18 DVI Interface Pin Name Pin Type Function DVI_R+ Input DVI Input Channel Red + DVI_R- Input DVI Input Channel Red - DVI_G+ Input DVI Input Channel Green + DVI_G- Input DVI Input Channel Green - DVI_B+ Input DVI Input Channel Blue + DVI_B- Input DVI Input Channel Blue -...
  • Page 19 Pin Name Pin Type Function LVA2M Output A-Link Negative LVDS Differential Data Output LVA2P Output A-Link Positive LVDS Differential Data Output LVA3M Output A-Link Negative LVDS Differential Data Output LVA3P Output A-Link Positive LVDS Differential Data Output LVACKM Output A-Link Negative LVDS Differential Data Output LVACKP Output A-Link Positive LVDS Differential Data Output...
  • Page 20 Pin Name Pin Type Function (for differential clocks) MCLK Output DRAM Memory Clock RASZ Output Row Address Strobe, active low CASZ Output Column Address Strobe, active low Output Write Enable, active low DQM[1:0] Output Data Mask Byte Enable 101, 133 DQS[3:0] Output Data Strobe...
  • Page 21 Pin Name Pin Type Function Ground Ground 1, 7, 13, 16, 35, 50, 64, 65, 80, 87, 103, 108, 114, 126, 132, 140, 155, 157, 159, 163, 172, 183, 184, 194, 205, 206...
  • Page 22 R2S15900 2: input L of AV1 27: input R of AV1 3: input L of AV2/S 26: input R of AV2/S 4: input L of YPBPR/VGA/HDMI 25: input R of YPBPR/VGA/HDMI...
  • Page 23 5: input L of TV 24: input R of TV 6: output L of AVOUT 23: output R of AVOUT 11: L output 19: R output 18: SCL 17: SDA 28: +9Vpower supply TPA3008 1: MUTE 3: R input 5: L input 20, 17: L input 41, 44: R input 15, 23, 33, 39, and 47: +18V power supply...

  • Page 24: Main Assembly

    667-L27U6-56 N101 MST6151DA (353-61510-10) N601 TVP5147 (353-51470-10) NA01 CS4340 (353-43400-30) N801 MTV412 (353-04120-10) Keypad board 667-L27U6-05 Remote control 301-RL27U6-27M (RC-R27M) MODEL LC-23U7 LC-23U7 LC-27U6/27U7 LC-32U5 (203-L27U70-01) (203-L27U70-02) Power supply 667-L27U6-20 667-L23U6-20 667-L27U6-20 667-L32K5-20 board IR board 667-L27U6-09 667-L27U6-09 667-L27U6-09 667-L32U5-09...

  • Page 25: Identification Criteria For The Bright Spot And Dark Spot Of The Lcd Screen

    Identification criteria for the bright spot and dark spot of the LCD screen Q’ty allowed Distance between two spots Category criteria 15" 20" 22" 30" 40" 15" 20" 22" 30" 40" One single ≤5 ≤2 ≤5 ≤2 ≤3 spot Bright 2 neighboring ≥15mm ≤2...

  • Page 26: Wiring Diagram

    Wiring diagram...

  • Page 27: Troubleshooting Charts

    Troubleshooting guide 1. No raster Turn-on power supply, check if the red indicator is light in the STANDBY? blue Check if PIN8(5V) of CPU Press POWER button in the board is normal? unit button and sensor control, check the indicator. Check if the PIN12 of X503 in Check STANDBY circuit of CPU board is high-level?
  • Page 28 2. Raster, but no picture Check if the unit button Does display sensor control menu in screen when operation? press submenu? Check channels have signal? HDMI/VGA/YPRP Enter factory-menu, Which is no initialization EEPROM, signal Replacing then turn off the TV, channels CPU board turn on again, display...
  • Page 29 3.no sound Check if PIN15, PIN30 Check PIN11 and PIN38 voltage of PIN19 output wave of Replacing N401 N401 is normal? N301 Check power supply Check PIN25 PIN26 output wave of Replacing N301 N201 Check PIN5 wave of Replacing N201 N201 Check PIN11 wave of TUNER1...

  • Page 42: Schematic Diagram (Lc-32U5 Power Supply Board)

    C901 BAS21 2200PF/4KV D901 1N5406RL TEST R901 SCK2R55A L904 PFC 3 CN901 R902 R903 1M ±5% 1206 MYG-10K-561 D903 D904 D902 C902 1N4007 1N4007 STTA806 R905 R906 R907 R904 L902 1000PF/4KV L903 1M ±5% 1206 1M ±5% 1206 1M ±5% 1206 1M ±5% 1206 JCLPQ32-2 D905...
  • Page 43 F902 T3.15A/250V MRT1 C930 HS901 HS902 HS903 0.1UF/630V LHS-80 LHS-80 LHS-35 BCX56-16 BCX53-16 T902 SPP11N60C2 KH32XH-T902 Q906 HS9001 D917 1N4746A-18V CN902 R984 10K ±5% R986 10K ±5% TJC3-4 L907 D919 KH32XH-L907 MBR20100CT D921 LL4148 D935 R988 R989 12V_1 12V_2 1N4749A-24V 11K ±5% 3.6K ±5% 24V_1...
  • Page 44 LCD-S.M.-U#_Ver.1.0...

This manual is also suitable for:

Lc-32u5Lc-27u7

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