Akai LEA-19A08G Service Manual
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Akai LEA-19A08G Service Manual

Multisystem lcd tv set
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LEA-19A08G

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Summary of Contents for Akai LEA-19A08G

  • Page 1 LEA-19A08G...
  • Page 2 SAFETY SAFETY PRECAUTIONS PRECAUTIONS SAFETY SAFETY PRECAUTIONS PRECAUTIONS IMPORTANT IMPORTANT SAFETY SAFETY NOTICE NOTICE IMPORTANT IMPORTANT SAFETY SAFETY NOTICE NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards.
  • Page 3 Leakage Leakage Current Current Check Check circuit circuit Leakage Leakage Current Current Hot Hot Check Check circuit circuit SERVICING SERVICING PRECAUTIONS PRECAUTIONS SERVICING SERVICING PRECAUTIONS PRECAUTIONS CAUTION CAUTION CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow CAUTION SAFETY PRECAUTIONS on page 3 of this publication.

  • Page 4: Soldering Guidelines

    1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the unit under test.
  • Page 5 Replacement Replacement Replacement Replacement 1. Carefully insert the replacement IC in the circuit board. 2. Carefully bend each IC lead against the circuit foil pad and solder it. 3. Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic coating to the areas). "Small-Signal"...

  • Page 6: Specification

    copper pattern. Solder the overlapped area and clip off any excess jumper wire. At At At Other Other Other Other Connections Connections Connections Connections Use the following technique to repair the defective copper patternat connections other than IC Pins. This technique involves the nstallation of a jumper wire on the component side of the circuit board.

  • Page 7: Input Mode

    5. 5. 5. 5. Chrominance Chrominance Chrominance & & & & Luminance Luminance Specification Chrominance Luminance Luminance Specification Specification Specification Item Unit Remark cd/m2 LC185EXN-SCA1 White peak brightness Contrast ratio cd/m2 Brightness uniformity Full white 0.620 0.344 0.327 GREEN Typ.. 0.626 Typ..
  • Page 8 1366*768 47.56 59.6 84.75 WXGA 1280*1024 63.595 60.0 108.875 SXGA 1920*1080 66.647 59.988 138.625 WUXGA 8. 8. 8. 8. HDMI HDMI HDMI HDMI Input Input Input Input (PC/DTV) (PC/DTV) (PC/DTV) (PC/DTV) Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark 720*400 31.468 70.08 28.321 HDCP...
  • Page 9 * Download 1) Execute ISP program “Mstar ISP Utility” and then click“Config” tab. 2) Set as below, and then click “Auto Detect” and check “OK”message. If display “Error”, Check connect computer, jig, and set. 3) Click “Connect” tab. If display “Can’t”, Check connect computer, jig, and set. 4) Click “Read”...

  • Page 10: Service Mode

    Service Mode How to enter into Service Mode. The way to the factory mode menu: Step 1: Enter to AV1 mode, using the Source button Step 2: Press MENU button Step 2: Input 710 Step 3: Press “OK” System will be into the factory mode menu.

  • Page 11: Troubleshooting

    TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING 1. 1. 1. 1. TV/CATV TV/CATV TV/CATV TV/CATV doesn doesn doesn doesn’t t t t display display display display Check TU1 Pin10,Pin11(VIF), Could you measure voltage of TU1 & IIC lines? Can you see the normal signal? Are they all normal? You should check power line &...
  • Page 12 2. 2. 2. 2. AV doesn doesn doesn’t t t t display display display AV doesn display Check CN9,CN28 Can you see the normal CN9,CN28 may have problem. waveform? Replace this Jack . Check the input of Main IC(U12) After checking the Power of Main Can you see the normal waveform? IC(U12)
  • Page 13 3. 3. 3. 3. Component Component Component Component doesn doesn doesn doesn’t t t t display display display display Check CN24. CN24 may have problem. Replace this Can you see the normal waveform? Jack. Check the output of Main IC(U12). After checking the Power of Main IC(U12) Especially you should check you should decide to replace Main IC or...
  • Page 14 4. 4. 4. 4. RGB RGB PC PC doesn doesn doesn doesn’t t t t display display display display Check CN7, CN7 may have problem. Replace this Can you see the normal waveform? Jack. After checking the Power of RGB Video Check the input of RGB Video switch, you should decide to replace RGB switch(U10) ,Can you see the normal...
  • Page 15 5. 5. 5. 5. HDMI HDMI HDMI HDMI doesn doesn doesn doesn’t t t t display display display display Check input connect CN4 Can you see the normal waveform? may have problem. Replace this Jack. Check DDC communication lines(CN4, After checking the Power of this chip, you Pin15,16) should decide to replace this or not.
  • Page 16 SCHEMATIC SCHEMATIC SCHEMATIC SCHEMATIC DIAGRAM DIAGRAM DIAGRAM DIAGRAM CN15 12p/2.0 STANDBY R341 2.7K R127 NC/0R +5V_Standby +5V_Standby +5V_Normal +12V_PWR Q50 AO3401A BL-ADJUST BL-ADJUST +12V_NORMAL BL-ON/OFF BL-ON/OFF +12V_PWR R342 U01 BM9435 3904 R128 750K PWR-ON/OFF R344 R343 PANEL-ON/OFF R131 100K +5V_Normal PANEL-ON/OFF 3904 STANDBY...
  • Page 17 RXO0- RXO0- RXO1- RXO1- RXO2- RXO2- RXOC- RXOC- RXO3- RXO3- RXE0- RXE0- RXE1- RXE1- RXE2- RXE2- RXEC- RXEC- RXE3- RXE3- RXO0+ RXO0+ RXO1+ RXO1+ RXO2+ RXO2+ RXOC+ RXOC+ RXO3+ RXO3+ RXE0+ RXE0+ RXE1+ RXE1+ RXE2+ RXE2+ RXEC+ RXEC+ +5V_Standby RXE3+ RXE3+ DATA0 A_MDATA0...
  • Page 18 +5V_USB1 +5V_USB1 +5V_USB1 +5V_USB1 DDR-SDRAM DATA[15:0] DDR-SDRAM DATA[15:0] DDR-SDRAM DATA[15:0] DDR-SDRAM DATA[15:0] +5V_Normal +5V_Normal +5V_Normal +5V_Normal A_MADR0 A-MADR0 DATA0 A_MDATA0 A_MADR1 A-MADR1 DATA1 A_MDATA1 AVDD_DDR1_2.5V A_MADR2 A-MADR2 DATA2 A_MDATA2 A_MADR3 A-MADR3 DATA3 A_MDATA3 A_MADR4 A-MADR4 DATA4 A_MDATA4 A_MADR5 A-MADR5 DATA5 A_MDATA5 A_MADR6 A-MADR6...
  • Page 19 HDMI1-RX2+ HDMI1-RX2P R675 HDMI1-RX2P HDMI1-RX2- HDMI1-RX2N R676 HDMI1-RX2N HDMI1-RX1+ HDMI1-RX1P R677 HDMI1-RX1P HDMI1-RX1- HDMI1-RX1N R678 HDMI1-RX1N HDMI1-RX0+ HDMI1-RX0P R679 HDMI1-RX0P HDMI1-RX2+ HDMI1-RX0- HDMI1-RX0N R680 DATA2+ HDMI1-RX0N HDMI1-RXC+ HDMI1-CLKP R681 DATA2 SHIELD HDMI1-CLKP HDMI1-RX2- HDMI1-RXC- HDMI1-CLKN R682 DATA2- HDMI1-CLKN HDMI1-RX1+ HDMI_HP1 DATA1+ HDMI_HP1 GND1...
  • Page 20 AV 1_V R275 33 R AV 1-in R208 EXTERN AV EXTERN AV R206 EXTERN AV EXTERN AV AV 1_V R280 33 R AV 3_V AV 3-in RGB0_ Y+ R114 33 R VGA -G RGB0_ Y-SOG R203 33 R CN1 1 S1 A VGA -B RGB0_ Pb+...
  • Page 21 AUDIO Pre AMP 4W/4ohm AUDIO Pre AMP 4W/4ohm AUDIO Pre AMP 4W/4ohm AUDIO Pre AMP 4W/4ohm AMP_AUOUTL0 C190 2.2u R247 AMP_AUOUTL0 INV1 CA33 470uF 4P/2.5 OUT1 AMP_AUOUTR0 SP_L C191 2.2u R258 AMP_AUOUTR0 INV2 CA34 470uF OUT2 +12V_NORMAL SP_R +12V_NORMAL CN18 M/SS CN26 SP_R...

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