Ser vice Manual 2005 MITSUBISHI ELECTRIC LIQUID CRYSTAL DISPLAY TELEVISION LT-4260 (L423FR) The LT-4260 includes the L423FR, monitor and HD-6000, receiver controller. This manual covers the L423FR, monitor. For the receiver/controller, see the HD-6000 Service Manual CAUTION: Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and "PRODUCT SAFETY NOTICE" contained in this manual.
MODEL: L423FR CONTENTS PRODUCT SAFETY NOTICE ............................................................................................................. 5 SAFETY PRECAUTIONS ................................................................................................................... 5 DISASSEMBLY Cabinet Disassembly ...................................................................................................................... 7 Panel Replacement ..............................................
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MODEL: L423FR PRODUCT SAFETY NOTICE Many electrical and mechanical parts in television receivers have special safety related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have special safety characteristics are identified in this service manual.
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MODEL: L423FR Cabinet Disassembly Page 7
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MODEL: L423FR LCD Panel Replacement Procedure 1 2 Remove back_cover Remove Bracket_Vesa 3 4 Remove MAIN-SP(L/R), & SUB-WOOFER Remove Sp-connector Remove BRACKET A Page 13
MODEL: L423FR 5 Remove SHIELD CASE POWER,MAIN 6 Remove connector of card_reader 7 Remove screw Remove screw Page 14 Remove PWB-LED coonector
MODEL: L423FR 8 Remove screw of earth-lead Remove screw of earth-lead of card reader 10 Remove CHASSIS REAR MAIN 3 screws Page 15
MODEL: L423FR 11 12 Remove BRACKET TB(TOP) 4 screws Remove screws of BRACKET_TB_PANEL To p-lef t Top- right Bottom-lef t Bo tto m- righ t Page 16
MODEL: L423FR 13 Remove connector of PWB-MAIN LVDS & earth-lead Remove connector of PWB-power 14 Remove LCD panel Page 17
MODEL: L423FR Wire Dressing Page 18
MODEL: L423FR Initial Setup A. Option Menu Setup Follow the steps below for the initial set-up: 1. Select the "MENU" display by pressing the "MENU" button once. 2. Press the number buttons "2", "0", "7", "0" in sequence to select the "OPTION MENU" display. 3. Press the "ADJUSTST" buttons to select "INITIALIZE." 4. Press "ENTER.
MODEL: L423FR Circuit explanation 1. V ideo circuits Video It explains the video circuits of L423FR (Monitor for LT-4260). It corresponds to various inputs (Component, VIDEO, PC, HDMI). It explains the composition and its function of an video circuit. (Refer to an attached “Video block diagram of LT-4260”, regarding as the flow of video signal.)• @ 1-1.
MODEL: L423FR 1-3. Video input circuit of HDMI In HDMI input, it is inputted into IC400 of the signal processing IC via Following IC. (I)IC500 : HDMI-Receiver IC ((SII9993CTG100 : SiliconImage) It adopts a input of the interface standard called HDMI in this model. This can send both digital image (video) and digital audio by the differential signal from one input, and this is already beginning to be used for the output of DVD-PLAYER.
MODEL: L423FR The output format of this IC is LVDS data stream (differential signals). In 28 bits, 24-bits digital video signal and horizontal sync signal, vertical sync signal, and an enable signal and a clock signal for LCD panel are pointed out. A phase-locked transmit clock is transmitted in parallel with the data streams over a fifth LVDS link. And this output is sent to LCD panel through J402.
MODEL: L423FR 2-3 Audio amplifiers circuits (R)IC670, IC680, IC6A0, IC6C0 : Single Ended Audio Amplifier IC (MP7720DS : MPS) This model apply digital Audio Amplifier in order to decrease power consumption. 2 piece is for main sounds, and 2 more piece is for sub-woofer, total 4pcs. This amplifier voltage is 14V (both AMPVCC(for main) and SAMPVCC(for Sub Woofer)). 2-4.
MODEL: L423FR 3 . Power circuit For power supply of L423FR, there are the power supply of “always on” and “ON/OFF” with a control signal. Power source signal Voltage “always on” Control [V ] or signal “ON/OFF” Output IC Note 24V 24 ON/OFF Psave1 For inverter 24V 24 always on - For MAIN/B, SUB/B A12V A9V S8V 12 9 8 ON/OFF ON/OFF always on Psave2 Psave2 - IC860 IC820 IC850 S5V 5 always on - IC890 A5V AMPVC C SAMPVC C 4.5V A3.3V D3.3V AD3.3V D2.5V A1.8V S3.
MODEL: L423FR LT-4260 BLOCK-DIAGRAM J603 AUDIO(DVI) J8A5 J8A3 USB(UBB) for CARD-LEADER J500 HDMI J604 AUDIO(PC ) J605 S-VIDEO IC501 EEP2K IC602 CS4334KS (Audio_DAC IC500 SiI9993CTG (HDMI_Rx) J3X0 RS232C (Monitor link) J200 D-SUB (PC) IC5G1 IC42S161 00 (SDRAM) J601 AUDIO J5A0 COMPONENT IC5T1 MM156 6 (Mux) J602 AUDIO （COMP.
MODEL: L423FR J9A00 T9A10 24V IC9A11 L9A11 PFC IC9A11 RY9F00 L9F02 PCB-POWER only T9W31 24V IC9A10 L9AW1 PFC L9F01 IC9A11 J802 L9AX1 PFC IC9A11 L9F00 T9X31 24V IC9A12 J9F00 J802 Page 26
MODEL: L423FR LT-4260 VIDEO BLOCK-DIAGRAM Digital signal Analog signal IC403 HY5DU283222AQ (DDRSDRAM) Differential signal (TMDS) Differential signal (LVDS) A J5A0 COMPONENT IC501 EEP2K C J500 HDMI E LOW-PASS Filter IC5T1 MM1566 (Mux) J605 S-VIDEO D IC500 SiI9993CTG (HDMI_Rx) J402 J601 VIDEO B IC5A0 SM5301 (LPF) F IC5G0 UPD64011BGM (Digital_Decoder) G IC400 gm1601 (Scaler & Video processor with CPU) IC5G1 IC42S16100 (SDRAM) H IC203 AD9888 (ADC for PC) J200 D-SUB (PC) I IC2A0 M6647
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MODEL: L423FR 1. Power failure (1)POWER is turned off. Connect the Power plug and turn on the main Power switch (Front switch or remote switch). Is the POWER LED lit? YES NO Is the power plug connected NO Poor power plug connection. to the wall outlet correctly? YES Is all harness on board NO connected correctly? All harness connects correctly. YES Is the 24V output available at NO Pins 1,2 of J9A00? J9A00 Pin No.
MODEL: L423FR (2)in case of POWER-LED is lighting Is the back-light on? YES NO Is the following harness connected? NO Poor harness connection. -Between PWB-POWER and INVERTER (J9X00-INVERTER) (J9W00-INVERTER) YES Confirms voltage of Pin2 of J9E00 (INV_SW) and Pin3 of J9E00 (BRIGHT) outputs “H” level(about more than 2V). YES Inverter or back-light of LCDpanel are out of order. Skip to “2. No picture displayed and picture errors.” Page 30 NO IC300 and peripheral circuits are out of order.
MODEL: L423FR 2. No picture displayed and picture errors. Note ) It applies when there is no screen display or an unusual screen is outputted, although 24V(Pin1,2 of J9A00) from PWB-POWER is outputted normally and the back light is turned on. *Input source changes in following order with DEVICE UP button of remote control or DEVICE button of front switch. Component Input PC HDMI 2-1. No picture displayed and picture errors of all input.
MODEL: L423FR 2-2. No picture displayed and picture errors of PC signal only. Enter an input of WXGA(1360x768:60Hz) or XGA (1024x768:60Hz) gray scale in D-sub connector(J200), 0.7Vp-p and select PC INPUT. The video level inputs above 0.7Vp-p. Is all harness connected correctly? NO Poor harness connection or defective cable. YES Problem is in IC203 or IC2A0 or IC2A3 or their peripheral circuits. Please exchange PWB-MAIN 2-3. No picture displayed and picture errors of Component signal only.
MODEL: L423FR 2-4. No picture displayed and picture errors of HDMI signal only. Enter gray scale pattern of 1080i timing in J500 connector, and select HDMI INPUT. And then, perform AV reset by front switch. The video level inputs above 0.7Vp-p. Is all harness connected correctly? NO Poor harness connection or defective cable. YES Problem is in IC500 or IC501 or their Peripheral circuits. Please exchange PWB-MAIN 2-5. No picture displayed and picture errors of INPUT signal only(included S-Video).
MODEL: L423FR 3. No audio output generated. 3-1. No all audio output generated. Enter audio input signal. ( ex. Component) NO Is all harness connected correctly? (Especially between PWB-MAIN and PWB-DCDC(J611-J6E4) Poor harness connection or defective cable. and PWB-DCDC and SPEAKER(J6EA-SPEAKER)) YES NO Volume level is not 0. And MUTE is off. Raise volume level. And MUTE is turned off. YES NO Are the specified voltages available at the pins below? (Power source check) CN Name Pin No.
MODEL: L423FR 3-2. No each(L or R) of audio output generated. Enter audio input signal. ( ex. Component) NO Is all harness connected correctly? (Especially between -DCDC and SPEAKER(J6EA-SPEAKER)) Poor harness connection or defective cable. YES BALANCE level is center. NO It adjusts BALANCE to center. YES Problem is in IC670 or IC680 or their peripheral circuits. Please exchange PWB-MAIN 3-3. No woofer of audio output generated. Enter audio input signal. ( ex.
MODEL: L423FR 4. Other faults 4-1. Remote control is not effective. After checking the polarity of batteries, has NO it loaded correctly? Load the batteries, making sure the polarities (-) and (+) are correct. YES Regarding as the slide switch at the top of NO It sets the slide switch as “TV”. the remote, does it set as “TV”? YES NO Does it use within 20 feet? YES It does not operate, even if it exchanges for NO it uses within 20 feet. It exchanges on new batteries. new batteries.
MODEL: L423FR LT-4260 Parts List Part Number 03A684088 LM-42T 10106291 10106221 10108521 RE080031 RE010072 RG021011 11002861 11002871 11002841 11002851 11302251 NLNJ01AY AP0FR1ML AM0FR1ML AS0FR1ML 290P118030 12301601 12301641 12301631 12301611 11002881 11002891 11002911 11002901 H5100171 Description LCD-(LC420W02-A4K3) (T/A REQ) MOUNT-PLASMA TILT BACK-UNIT BRACKET BEZEL TC ASSY BEZEL-UNIT CABLE-USB HGRY USB 1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 a a 3 A9V 4 A5V GND 2 3 3 PSAVE2 4 PSAVE3 4 5 INV_SW 5 2 3 4 6 7 9 2 2 3 4 SCL GND GEN_W S5V 6 RESERVE 7 J400 1 3 6 7 J8A2 MUTE_SUB1 GND SDA 5 BLUE 8 AMBER S3.3V S7B-PH-K-S 9 8 RELAY 9 7 b B11B-PH-K-S BRIGHT 11 10 c Writing to H8S 1 1 2 PSAVE1 11 10 GND MD0 RES GND VCC (S3.3V) GND 6 2 3 DATA_N DATA_P MD1 8 MD2 10 GND 5 FWE J302 SCK1 9 4.5V 1 4 5 6 7 J8A0 TXD1 12 11 10 S3.
5 C311 16V 47u GEN_W RGRED GEN_INT L301 BLM21P221SG PSAVE1 C312 K-.
1 2 3 4 5 6 7 8 9 10 11 a a KEY1 KEY0 μCON b J3X0 DT10121-R3T CN MD9P L3X8 BK2125HS750 L3X7 BK2125HS750 b C3Y4 K-.01 DG c DG L3X1 C3Y5 K-.01 BK2125HS750 D3Y2 UDZS9.1B DG D3Y3 UDZS9.
8 4 S5V R201 F-75 1/4W 5 1/16W 1/16W C208 16V 47u L205 BLM21P221SG 6 1/16W R202 F-75 1/4W GND 1 3 5 7 1 3 5 7 C235 16V K-.1 0 1/16W R250 HS600 GND R251 33 0 1/16W R253 R252 0 GND DV11201-P8 R249 4S600 1/16W R261 R200 F-75 1/4W 4 6 8 2 4 6 8 FROIS2 a AD3.3V L210 BLM21P221SG R247 4S600 1/16W 3 FR_EB7 6 FR_EB6 4 FR_EB5 2 FR_EB4 8 FR_EB3 6 R248 4S600 1/16W B 1/16W 2 L208 FLC32CT-100K R258 0 G C207 16V K-.
7 C2E0 16V 47u C2C9 16V K-.1 DG DG 10K 10K R2C5 R2E0 C2E9 16V K-.1 11 SOG7 SOG6 SOG5 SOG4 SOG3 SOG2 10 SOG1 SOG0 SOB7 SOB6 7 SOB5 5 SOB4 3 1 C2E2 16V K-.1 SOB3 7 TO SOB2 5 L2A3 BLM21P221 SOB1 3 SOB0 1 C2E3 16V K-.1 C2E4 16V K-.1 9 SOG0 R2C0 4S600 8 1/16W SOG1 6 SOG2 4 SOG3 SOR0 SOR1 R2C1 4S600 8 1/16W 2 7 R2C4 5 10K 3 R2C6 DG C2E5 16V K-.1 R2C8 100 1/16W SOR2 6 A3.3V a L2A5 BLM21P221 ADC SI_QDE 5 4 D3.
1 2 3 4 5 6 7 8 9 10 11 a a VREF2 R5C5 F-33K 1/16W A5V b VREF1 μCON TO b L5A3 FLC32CT-100K D5A0 DAN217 C5A4 6.3V 10u 1 R5C6 F-1.2K 1/16W C5A5 16V 100u Q5A0 C2412K/C3928A 3 2 R5C7 F-3K 1/16W C5A3 K-.01 C5A6 K-.01 R5A3 4.7K 1/16W Q5A1 C2412K/C3928A C5A0 10V .47 L5A0 BLM21B050SPT R5C8 F-15K 1/16W c R5E0 4.7K 1/16W C5A9 K-.01 C5A8 K-.01 R5A9 F-820 1/16W C5A7 K-.01 R5A8 4.
2 3 HDMI_Y2 HDMI_Y3 HDMI_PB6 HDMI_Y1 HDMI_PB5 HDMI_PB(7:0) HDMI_PB4 HDMI_Y0 HDMI_PB3 HDMI_PB7 HDMI_PB2 4 6 8 5 7 1 3 5 7 1 3 5 7 R546 100 3 R543 33 2 4 6 8 1 3 5 HDMI_Y7 HDMI_Y(7:0) L507 0 52 HDMI_CLK 51 C538 OPEN Q13 53 Q12 54 Q11 55 Q10 56 Q9 57 OVCC Q8 58 OGND 59 Q7 60 Q6 61 Q5 62 Q4 63 Q3 VCC GND OGND OVCC 64 Q14 50 OVCC 47 80 PVCC ODCK 46 81 EXT_RES OGND 45 82 AVCC Q17 44 83 RXC- Q18 43 84 RXC+ Q19 42 85 AGND GND 41 C537 K-.
1 2 3 4 5 6 7 8 9 10 11 a a DEC_CLK RGRED 100 DECRST 1/16W 100 1/16W A3.3V_SDA 100 1/16W A3.3V_SCL FIELD R5K8 R5K9 R5L0 1/16W 47K R5L2 R5K6 F-360 1/16W R5K5 100 1/16W DGND 80 B16V K-.1 B16V 10u B16V 10u B16V K-.1 C5W2 L5G9 100 1/16W L5G8 0 1/16W ROCK 71 131 TM2 DVDD1 70 132 SMC ROY0 69 133 SCKSET ROY1 68 134 AGND ROY2 67 135 AYI1 DGND 66 1 2 DEC_Y0 136 VCLY ROY3 65 3 4 DEC_Y1 137 AYI2 ROY4 64 5 6 DEC_Y2 138 VRTY DVDD1 63 7 8 DEC_Y3 C5N5 B16V K-.
A1 A2 A3 C445 K-.1 B24 B25 B26 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 D5 C437 K-.1 D6 C466 K-.1 C440 K-.1 C441 6.3V 10u C435 K-.
8 9 10 OCM_ADR[19:0] a 7 OCM_CS 6 OCM_DAT[7:0] 5 OCM_RE 4 OCM_WE 3 DD_DQS 2 DD_DAT[31:0] 1 11 D3.3V a C4F1 K-.
1 2 3 4 5 6 7 8 9 10 11 L610 10u S5V S8V 50 ANA_IN1+ BIAS C652 No use C651 No use C649 No use C650 No use C647 No use C648 No use C646 10V 1u 42 41 40 39 38 37 36 35 34 33 C657 10u Q601 C2412 CAPL_M 32 Y1 4 RV1 VCC 34 D602 UDZS9.
1 2 3 D8A0 1SS355TE-17 GND 1 A12V 2 4.5V A12V a 3 4 K-.01 7 8 9 10 11 a 1 8 2 7 D8K0 1SS355TE-17 S3.3V K-.01 D1.8V L8C1 A5V C8P1 BLM21P221SG L8C2 C8A0 16V 100u 105C C8P2 C8A1 K-.01 BLM21P221SG 5 GND B12B-EH-K-S N.C A9V 6 L8A1 BLM21P221SG L8A0 BLM21P221SG C8P0 5 A3.3V IC8A0 SI3033LSA L8C0 BLM21P221SG A9V 4 R8A0 4.7K 1/16W 3 C8A2 K-.01 6 IC8K0 SI3018LSA C8A3 100u 16V 105C L8K1 BLM21P221SG L8K0 BLM21P221SG K-.
4 5 9 10 11 3 2 SP_R SGND 1 a SP_LP C6F0 CH 100 C6F4 CH 100 C6F2 CH 100 C6F3 CH 100 C6E1 25V 1000u SP_LN C6F1 100 CH C6E2 25V 1000u SP_RP 1 SAMPVcc (14V) 8 B6B-EH 4 SUB_IN HP_SENS a 5 7 2 J6E4 6 6 3 3 SP_L 2 SGND 1 b b Q6A0 C2412 5 C6A5 10V 1u IC6A0 MP7720DP C6A6 16V 1u SAMPVcc 14V 4 8 2 G1 D1 7 3 S2 D2 6 4 G2 D2 5 8 2 G1 D1 7 3 S2 D2 6 4 G2 D2 5 R6F5 4.7k R6FA R6FG 10k C6F6 K-.
4 5 6 7 D860 1SS355TE-17 C862 35V 470u 105C IC860 PQ1CY1032Z 1 R863 220K 1/16W a 10 11 L861 LHLP12 33u L862 COIL-RF K-10m F860 491002 125V 2A 2 ZL 5 ZL D861 SFPB-74 4 3 C860 k-.01 C865 16V 1000u 105C C866 16V K-.1 R864 39K 1/16W R860 F-6.8K 1/16W A12V C867 16V 220u 105C D862 BZX85-C15 A5V GND A12V A9V C802 BLM21P221SG L804 BLM21P221SG K-.01 C803 L805 R862 F-1K 1/16W J800 B5B-VH a L803 R861 F-1.8K 1/16W C864 K-.01 K-.01 BLM21P221SG C804 5 AMPVcc S8V K-.01 A9V N.
5 6 C9X18 1KV 470P 2 3 2 4 JP9F4 JUMPER 1 2 3 5 R9X02 1/10W 100K 2 R9X05 1/10W D-3.9K c 13121110 9 8 7 6 5 4 3 2 1 J9W00 B13B-PH-K-S 24V 24V C9W50 0.01 R9W63 1/2W 270 R9W00 1/10W 10K 7 1 R9W01 1/10W 10K 6 R9W03 1/10W D-27K IC9W12 PC123Y22 2 R9W54 47 R9W53 47 IC9W13 PC123Y22 2 IC9W00 KIA431A -AT R9W04 1/10W D-6.8K C9W33 AC250V E-1500 D9W02 UDZS_30B R9W52 1/10W 10K Q9W18 D9W29 1SS355TE DTC124EKA -TE17 R9W50 1/10W 10K D9W28 UDZS_11B R9W49 1/10W 22K R9W05 1/10W D-3.
1 2 3 4 5 6 7 8 9 10 11 IR a a 1 S5V L0K2 BLM1608HM121 R0H2 2.7K 1/16W GND L0K3 BLM1608HM121 R0G4 12K 1/16W R0G6 1/16W 10K IC0G0 OPA2350EA 2 R0G3 1/16W 220K b R0H1 1/16W 4.7K Q0G0 2SC2412K C0L1 39 C0L3 100 C0L2 C0L4 100 3 6 5 39 4 C0G1 0.01u 50V GND R0K2 10K R0H0 10K 1/16W 8 1 b LCD_RMC R0H4 1/16W 100 R0G9 220K 1/16W 7 C0G3 220 50V STB_RMC 4 R0G8 1/16W 1.2K 3 C0G7 10U 6.3V 5 C0G0 10U 6.
