Haier 20AL25S - 20" LCD TV, Service Manual

Page 1: ...SERVICE MANUAL FOR HLE20BB TFT LCD TV Haier Group ...

Page 2: ... CONTENTS 1 Main Unit Description 2 Features 4 Warning and Cautions 6 Replacement of Memory IC 8 Net Dimension 9 Remote Controller Functions 10 ICs function description 13 Block Diagram 21 Trouble Shooting 26 ...

Page 3: ...P TV channel down to select the item in the menu CH P TV channel up to select the item in the menu 5 Power supply switch 6 Power indicator Illuminates red in standby mode illuminates green when the display is turned on 7 Remote Sensor Selects the input signals Receives the signals from the remote control TV AV MENU VOL VOL CH CH POWER 1 2 3 4 5 6 7 2 3 1 4 5 2 3 1 4 6 7 5 6 7 HLH15BB HLE20BB 15HL2...

Page 4: ...rough your cable box Connection Options Earphone port PC Audio Input Connect the PC output connector from a PC to the audio input port The figure is just for referrence please see actual unit DVD DTV Input Connect a component device to these jacks ANT IN S VIDEO D SUB IN PC AUDIO IN AUDIO IN R L VIDEO IN V Pb Pr Y COMPONENT IN Video Input Connect video output from an external device to this jack D...

Page 5: ...em NTSC 9 NO of preset channels 100 10 Picture mode Yes 11 Angel of view H 176 V 176 12 Color display 16 777 216 13 Color level 16 14 OSD languages ENGLISH FANCE SPAISH 15 AV stereo Yes 16 Surrounding sound No 17 Audio system M 18 Bass Yes 19 Balance Yes 20 Sound mode Yes 21 Mute Yes 22 BTSC Yes 23 AV input Yes 24 AV output NO 25 Y CB CR Yes 26 Y PB PR Yes 27 S video jack NO 28 TV in Yes ...

Page 6: ... CHIP Yes 34 Semitransparent menu Yes 35 ZOOM NO 36 16 9 mode NO 37 Child Lock NO 38 Quick View Yes 39 NO of built in speakers 2 40 Audio output power Built in W 2 1 5 41 Total power input W 40 42 Voltage range V 120 43 Power frequency Hz 60 44 Time of sleep timer MINS 240 45 Approval UL 46 Suitable market U S ...

Page 7: ...zard Do not expose the main unit to rain or moisture Warning Do not drop or push objects into the television cabinet slots or openings Never spill any kind of liquid on the television receiver Caution If the television is to be built into a compartment or similarly enclosed the minimum distances must be maintained Heat build up can reduce the service life of your television and can also be dangero...

Page 8: ... the AC outlet Caution Avoid exposing the main unit to direct sunlight and other source of the heat Do not stand the television receiver directly on other produces which give off heat E g video cassette players Audio amplifiers Do not block the ventilation holes in the back cover Ventilation is essential to prevent failure of electrical component Do not squash power supply cord under the main unit...

Page 9: ...with the initial data values or blank memory IC 3 Power On Plug the 12V power plug into 12V power socket If memory IC is blank the program will take 25s to initial memory IC 4 Check and set SYSTEM default value 1 Press DISPLAY key then press colour key red green yellow DISPLAY on the Remote control unit continuously for factory used 2 The Factory2 will be displayed on the screen 3 Check the settin...

Page 10: ...9 TV channel number select 3 RECALL Quick TV channel switch return to the last channel 10 TV AV Select PC COMPONENT AV SV TV 7 MTS SAP Select MONO STEREO SAP in NTSC system 1 MUTE MUTE 8 P STD Select picture mode PERSONAL STANDARD MILD FRESH 5 DISPLAY Display current input signal information 4 EXIT Menu exit Illustration of the keys on the remote control MUTE RECALL DISPLAY EXIT 1 2 3 4 5 6 7 8 9 ...

Page 11: ...teries 1 Slide open the cover of the battery compartment on the back of the remote control 2 Load two batteries in the compartment plus and minus poles to respective mark 3 Replace the cover of the battery compartment AAA alkaline ...

Page 12: ...ility for direct drive of LEDs 14 DECDIG Decoupling digital supply 15 VP1 1st supply voltage TV processor 5V 16 PH2LF Phase 2 filter 17 PH1LF Phase 1 filter 18 GND1 Ground 1 for TV processor 19 SECPLL SECAM OLL decoupling 20 DECBG Bandgap decoupling 21 EWD AVL East West drive output or AVL capacitor 22 VDRB Vertical drive B output 23 VDRA Vertical drive A output 24 VIFIN1 IF input 1 25 VIFIN2 IF i...

Page 13: ...left signal 50 AUDIOIN4R Audio 4 input right signal 51 CVBS4 Y4 CVBS4 Y4 input 52 C4 Chroma 4 input 53 AUDIOIN2L SSIF Audio 2 input left signal sound IF input 54 AUDIOIN2R Audio 2 input right signal 55 CVBS2 Y2 CVBS2 Y2 input 56 AUDIOIN3L Audio 3 input left signal 57 AUDIOIN3R Audio 3 input right signal 58 CVBS3 Y3 CVBS 3 Y2 input 59 C2 C3 Chroma 2 3 input 60 AUDOUTLSL Audio output for audio power...

Page 14: ...ence voltage 0V 90 VREFAD_POS Positive reference voltage 3 3V 91 VREFAD Reference voltage for audio ADCs 3 3 2V 92 GNDA Ground 93 VDDA 1 8V Analogue supply for audio ADCs 1 8v 94 VDDA2 3 3V Supply voltage SDAC 3 3V 95 VSSadc Ground for video ADC and PLL 96 VDDadc 1 8V Supply voltage video ADC and PLL 97 INTO P0 5 External interrupt 0 or port 0 5 4mA current sinking capability for direct drive of L...

Page 15: ...P1 2 INT2 Port 1 2 or external interrupt 2 127 P1 4 RX Port 1 4 or UART bus 128 P1 5TX Port 1 5 or UART bus 2 RTD2023B PIN SYMBOL DESCRIPTION 1 APLL_GND Ground for multi phase PLL 2 APLL_VDD Power for multi phase PLL 3 PLL_TEST1 Test Pin 1 Power on latch for MCU crystal location 4 PLL_TEST2 Test Pin 2 Power on latch for crystal in frequency 5 TMDS_TST TMDS_TEST Pin Power on latch for host interfac...

Page 16: ... bit 4 34 V3 Video8 bit 3 35 V2 Video8 bit 2 36 V1 Video8 bit 1 37 ADC_GND ADC Ground 38 ADC_VDD ADC Power 39 V0 Video8 bit 0 40 VCLK Video8 Clock 41 NC 42 NC 43 NC 44 NC 45 NC 46 Digital 1 8V Ground GNDK 47 Digital 1 8V Power VCCK 48 COUT Crystal out 49 PWM2 Pulse width modulation output port2 50 DDCSCL1 ADC Open drain Internal 75K pull high 51 DDCSDA1 ADC Open drain Internal 75K pull high 52 DCL...

Page 17: ...play B port Red Data 5 80 BRED4 Display B port Red Data 4 81 BRED3 Display B port Red Data 3 82 BRED2 Display B port Red Data 2 83 Pad 3 3V Power PVCC 84 Pad 3 3V Ground PGND 85 ABLU7 Display A port Blue Data 7 86 ABLU6 Display A port Blue Data 6 87 ABLU5 Display A port Blue Data 5 88 ABLU4 Display A port Blue Data 4 89 ABLU3 Display A port Blue Data 3 90 ABLU2 Display A port Blue Data 2 91 ABLU1 ...

Page 18: ... drain Internal 75K pull high 121 DDCSCL2 DVI Open drain Internal 75K pull high 122 PWM0 Pulse width modulation output port0 123 RESET_OUT Reset out 124 33VRST_REF Reference 3 3v for Reset Out 125 DPLL_VDD Power for digital PLL 126 DPLL_GND Ground for display digital PLL 127 XO Crystal OSC output 128 XI Reference clock input from external crystal or from single ended CMOS TTL OSC 3 SM5964 PLCC Fun...

Page 19: ... port 2 bit 12 of external memory address 29 P2 5 A13 Bit 5 of port 2 bit 13 of external memory address 30 P2 6 A14 Bit 6 of port 2 bit 14 of external memory address 31 P2 7 A15 Bit 7 of port 2 bit 15 of external memory address 32 PSEN Program storage enable 33 ALE Address latch enable 34 P4 1 Bit 1 of port 4 35 EA External access 36 P0 7 AD7 Bit 7 of port 0 data address bit 7 of external memory 3...

Page 20: ...channel 2 7 VCC VCC is the supply voltage input 8 M SB M SB is the mute standby mode enable When held at less than 2V this signal enables the TPA1517 for standby operation When held between 3 4V and 8 8V this signal enables the TPA1517 for mute operation When held above 9 2V the TPA1517 operates normally 9 IN2 IN2 in the audio input for channel 2 10 20 GND HS GND HS are the ground and heat sink co...

Page 21: ... 0 1uF 0603 Y5V 80 20 50V R56 100ohm 0603 5 1 10W D45 NC LL4148 LL 34 D19 NC LL4148 LL 34 R65 NC 100ohm 0603 5 1 10W E43 NC 470uF 25V 20 10 13 105 D49 NC 1N5822 SMD SK34 SMA TR DO 27 L16 NC 47uH 12mm 12mm 10 2A BS 1 IN 2 SW 3 GND 4 FB 5 COMP 6 EN 7 NC 8 U15 NC MP1410ES C164 NC 100pF 0603 NPO 5 50V C147 NC 0 01uF 0603 X7R 10 50V R66 NC 10Kohm 0603 5 1 10W C146 NC 0 01uF 0603 X7R 10 50V R190 NC 30 9...

Page 22: ...603 NPO 5 50V C10 100pF 0603 NPO 5 50V C11 100pF 0603 NPO 5 50V C12 100pF 0603 NPO 5 50V C13 100pF 0603 NPO 5 50V C17 100pF 0603 NPO 5 50V SDIO DVD_STB DVD_CLK DVD_IR DVD_DAT GND 1 2 3 4 5 CN19 NC 5PIN 2 0 D H R83 NC 330ohm 0603 5 1 10W IR_IN LED_O LED_G 1 2 3 4 5 6 7 8 9 10 CN6 10PIN 2 0 D H K0 K1 K2 K3 K4 K5 K6 K7 GND 1 2 3 4 5 CN5 5PIN 2 0 D H CPU5V C74 100pF 0603 NPO 5 50V PPWR BACKLIGHT_PW K7...

Page 23: ...F 0603 Y5V 80 20 50V GND VS R241 100ohm 0603 5 1 10W VDRB HOUT VS TV_VS TV_HS 5V 5V RO GO BO R73 NC 100ohm 0603 5 1 10W R74 NC 100ohm 0603 5 1 10W C157 NC 47pF 0603 NPO 5 50V C156 NC 47pF 0603 NPO 5 50V TV R TV G TV B C142 0 1uF 0603 Y5V 80 20 50V R268 NC 0ohm 0603 5 1 10W R267 0ohm 0603 5 1 10W 5V TV SC1_SWITCH R8 75ohm 0603 5 1 10W C70 330pF 0603 NPO 5 50V R67 75ohm 0603 5 1 10W C109 330pF 0603 ...

Page 24: ...0V 1 8V_AVCC C21 0 1uF 0603 Y5V 80 20 50V 3 3V_PLL C24 0 1uF 0603 Y5V 80 20 50V C25 0 1uF 0603 Y5V 80 20 50V 3 3V_DVCC C26 0 1uF 0603 Y5V 80 20 50V C27 0 1uF 0603 Y5V 80 20 50V AVS0 AHS0 R0 R0 G0 G0 B0 B0 SOG0 R205 1Kohm 0603 5 1 10W C22 0 1uF 0603 Y5V 80 20 50V C20 0 1uF 0603 Y5V 80 20 50V R14 4K7ohm 0603 5 1 10W R15 4K7ohm 0603 5 1 10W R16 NC 4K7ohm 0603 5 1 10W R17 NC 0ohm 0603 5 1 10W R18 NC 0...

Page 25: ... BAV99LT1 A7 SOT 23 1 3 2 D35 BAV99LT1 A7 SOT 23 C4 0 1uF 0603 Y5V 80 20 50V 1 3 2 D36 BAV99LT1 A7 SOT 23 VGA_R VGA_G VGA_B VGA_SCL VGA_SDA VGAHS VGAVS GND GND GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 CN1 D351 015F 001 GND VGA5V TXD RXD R30 10Kohm 0603 5 1 10W GND 4 VCC 8 A0 1 A1 2 A2 3 WP 7 SCL 6 SDA 5 U3 NC 24C02N SO 8 R21 100ohm 0603 5 1 10W R11 100ohm 0603 5 1 10W R34 10Kohm 0603 5 1 10W GND DI...

Page 26: ...tput for LDO OK Turn on or not Check the power supply net follow Turn on the set Change LDO Or The load is in shorted OK Check Pin3 U13 For 350Khz switch signal U13 MP1410ES D17 IN5822 Check L9 47μH Higt Voltage Low voltage U13 MP1410ES PIN5 U13 Check C111 0 01F Y N Y N N Y Y N Y N Y N N Y OK Check Mcu 1 power supply 2 Reset 3 Crystal N Y ...

Page 27: ...n Check 5V for BLON on CN7 Tunn on or not Turn on Check Mcu 1 power supply 2 Reset 3 Crystal Check the cirture for Q4 MMBT3904 N N N Y Y 12V inverter input Check the power supply Check the inverter or self proofed N Y Check U25 SM5964 PIN43 ...

Page 28: ...heck voltage of Q24 Turn to power suppy trouble shorting Check LCD or Panel Connector Check U5 1 Power supply 2 Time circuit Check Q23 0 3 3V 5V or 12V according to the volitage N Y Check power supply for panel Check voltage of Q23 Check Q23 be care for the shorting Check circuit between CN8 and CN9 N N N N Y Y Y Y ...

Page 29: ...k voltage for the panel Check the panel connector Check LCD Check the output net the connector Change the panel connector Change LCD Select the right panel voltage N Y N N Y Y Check U5 For Power supply timer circuit Y Change mend the part circuit N ...

Page 30: ...1 Y N Check the speaker N Y Check U25 SM5964 And U25 I 0 interface PIN6 12 Check U20 PIN1 and PIN9 for signal input Y N Y N Check U20 PIN4 and PIN6 for signal output Chekc U21PIN60 61for signal output Y N Check U20 or E45 100 Examine and repair the output net between U20and CN11 Check net between U21 PIN60 61 And U20 PIN1 9 Check input audio input AV U21 PIN49 50 PC U21PIN53 54 Check U21 Check the...

Page 31: ...ck audio and PC AV N Y Turn to NO AUDIO trouble shooting Check signal ouput of SAW2 M9370M30 PIN1 1 check SAW2 2 check U21 PIN29 30 3 check power supply of U21 4 make sure U21 is damaged Check the net between SAW2 Pin1and C133 0 01μF Check C133 Y N ...

Page 32: ...3 3 TV Audio abnormal Noise and NICAM can t be detected Check the audio system Select the right audio Search again Picture is normal Check C113 0 01UF D26 R140 0Ω or change SAW2 N N Y Y ...

Page 33: ...et Y N Check voltage T1 PIN3 for 0V Examine and repair R267 0Ω N Y Check I2 C signal T1 PIN4 5 Check I2 C net connect with U25 SM5964 PIN16 17 N Y Check signal T1 PIN11 N Check the net between T1 PIN11 and U21 PIN24 25 Power supply for U21 Y Check voltage T1 PIN1 1V Examine and repair The circuit N Y Change T1 TDQ 6H3 Check voltage T1 PIN9 for 33V Examine and repair 33V circuit Y N ...

Page 34: ...PC Picture not in center Missing color Picture dithering No signal Auto adjust Check U5 RGB input Reset Y N Check R G B circuit Check VS HS signal Check OSD setting Reset Check VS HS i i Y N Check VS HS PC ...

Page 35: ...4 3 AV SV SCART YPbPr YCbCr S Video AV Missing color No signal No signal except PC Reset Check RGB Check VS HS circuit Check the circuit for power supply of U21 Check RGB signal input for U5 Y N ...

Page 36: ...Sincere forever ...