Table of Contents
Related Manuals for THOMSON 50M14DP
Summary of Contents for THOMSON 50M14DP
- Page 1 50M14DP/55E5500S1 service manual The 50M14DP and 55E5500S1 used the same main board. So most part of them are the same except the appearance and the size. The 50M14DP will be introduced as an example here. 50M14DP 55E5500S1 1 ...
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Page 2: Table Of Contents
table of contents Precautions and Safety Notices ............... 3 Disassembly Procedure .................. 4 3. Key Points’ voltage and wave form .............. 6 3.10 Power supply flow chart .............. 6 3.11 3.3V STB .................... 7 3.12 Test point of POWER ON/OFF ............. 7 3.13 Test point of Main board’s Main_power. .......... 8 3.14 24V‐12V test point ................ 9 3.15 ... -
Page 3: Precautions And Safety Notices
1. Precautions and Safety Notices 3 ... -
Page 4: Disassembly Procedure
2. Disassembly Procedure There are five kinds of screws in the back cover. They are marked in different colors as the picture. Be careful the key wire is connect with the main board and the back cover. Take the key wire off and remove the back cover. 4 ... - Page 5 5 ...
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Page 6: Key Points' Voltage And Wave Form
3. Key Points’ voltage and wave form 3.10 Power supply flow chart 6 ... -
Page 7: Stb
3.11 3.3V STB PIN7 is the test point of 3.3V STB 3.12 Test point of POWER ON/OFF PIN10 of P102 is the test point of POWER ON\OF. You can also test Q104.C pole is low means POWER OFF when Q104 is break‐over. C pole is high means POWER ON when Q104 is ... -
Page 8: Test Point Of Main Board's Main_Power
3.13 Test point of Main board’s Main_power. PIN1, PIN2, PIN4 are the inputs of 24V 8 ... -
Page 9: 12V Test Point
3.14 24V‐12V test point L101 is the test point of 24V‐12V. The IC used for 24V‐12V is TI’s TPS54331.It is also used in MT32,MT10B. It is also a BUCK reduction voltage just like MP1593.It sets output voltage by using resistance to separate voltage sampling.PIN4 is Soft start.PIN3 is Enable and is high level in order.PIN6 is Compensator.PIN5 is Feedback voltage and is 0.8V in usally.PIN1 is Bootstrap connecting to a freewheeling diode’s negative pole with a capacitance.PIN8 ... - Page 10 3.15 24V‐5V L116 is the test point of U5:RT8110 is a DC‐DC source IC. It had been used in many other boards. It worked as a model of isochronous BUCK reduction voltage. It separates voltage to setting outputs voltage by using R130, R111 and R109.When PIN8 of U104 receives the FB signal; U104 will adjust the square wave’s duty ratio of PIN2 and PIN4’s outputs. And it will control the time of two MOS in Q1 so as to stabilize voltage. Vout=0.8*{1+R130/(R111+R109)} 10 ...
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Page 11: 3.3V
3.16 5V‐3.3V PIN4 of U101 is the test point of 5V‐3.3V. 11 ... -
Page 12: 1.2V
3.17 5V‐1.2V L102 is the test point of 5V‐1.2V. U7: The IC is G153.It’s function is just like TPS54519.It can set work frequency by PIN8.And it has a power good signal output. Now this IC is used in V101 and MT31. Vout=0.827*{1+R136/(R138+R137)} On‐off frequency setting relationship (Relation between the resistance of PIN8 and frequency) RT(KΩ)=311890/(Fsw(KHz)1.0793 (Fsw(KHz)=133870/RT(KΩ)0.9393 12 ... -
Page 13: 1.5V
3.18 5V‐1.5V L115 is the test point of 5V‐1.5V(DDRV). U103:MP217 is a DC‐DC BUCK deduction voltage source IC.PIN1 is the FB sampling of output voltage. The output value can be set by R125, R131 and R128 separate voltage.PIN4 and PIN5 are inputs.PIN3 is output. Vout=0.8*(1+R125/R131+R128) 13 ... -
Page 14: Main Ic's Key Test Point (Reset Circuit)
3.19 Main IC’s key test point (Reset circuit) The C pole of Q905 is RESET test point. 12V will charge to C957 (Capacitance is short circuit in the period of charge) when system is power on.Q905’s B and E is in same level. Dynatron is cut‐off. C pole is in low level. When C957 is full (Capacitance is same to open circuit), Q805’s B is 0.7v or more small than E’s level. Dynatron is break‐over. C pole will output high voltage level. Main IC request the RESET time is more than 10S. Q906 is designed to prevent system reset in standby. If there has no Q906 (RESET signal will be plugged to high level in normal work or even in standby), 24V will drop in standby and Q905’s C will follow it, so the system will reset. RESET signal Power on reset Power off reset 14 ... -
Page 15: Bl_On/Off (Wave Form)
3.20 BL_ON/OFF (wave form): PIN12 of P102 is the test point of BL_ON/OFF. The value is 3.3V high level in BL_ON and BL_OFF timing test: Blue: VBL; Green: DIM; Purple: BL_ON. 15 ... -
Page 16: Dim Test Point (Wave Form)
3.21 DIM test point (wave form): PIN11 of P102 is the test point. The wave form of DIM is square wave and it has 10%‐100% duty ratio. The test point will be PIN8 if it analogue dimming It is the LED negative port and DIM’s follow wave form: 16 ... -
Page 17: Lvds Power Supply On/Off (Wave Form)
3.22 LVDS power supply ON/OFF (wave form) PIN1,2,3,4 of P600 or The D of Q601:The test point of LVDS power supply. B of Q600 is high level in normal. Gate’s level of Q601 will be dragged down when Q600 is break‐over. Then Q601 (P channel MOS) will break‐over to supply power to LVDS. Follow is the LVDS power on/off timing test: Purple means VCC, Green means SIGNAL, Blue means BL‐ON. 17 ... -
Page 18: Power Supply For Ddr
3.23 Power supply for DDR IC C401 is the test point of Power Supply for DDR IC. 3.24 Key test point of AMP Test points of S: R930,R931,R932 and R938. Test points of C950 is test C: point of R935,R929. RESET.(normal is R950 is test point of 24V R937 is test power ... - Page 19 STA381 digit AMP’s request of timing: The value of AMP module’s ripple is also very important. The power is big when the sound frequency is low, and it causes the ripple of 24V is also very big. This will cause the AMP’s over frequency protection. Otherwise the RESET signal of AMP (PIN40) is also very important. If its timing isn’t accord with the timing of Power on, there maybe have problems that: noise in POWER on etc. 19 ...
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Page 20: Main Unit Circuits' Elements
4. Main unit circuits’ elements 4.1 TV signal flow The 75Ω antenna receives the high frequency TV signals, and put the signals into Tuner TU1 .After processed by the inner circuits of Tuner: High frequency amplify, mixing, filter , IF amplify, frequency discrimination, preview release, AGC Auto Gain Control, AFT Auto Frequency Control, PLL Phase‐locked loop filter etc. TU1 output the ... - Page 21 AC Power‐On Sequence DC Power‐On Sequence 21 ...
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Page 22: Intro Of Amp
Crystal request: Power supply request 4.3 Intro of AMP IC The IC is STA381BW that had been used in many other boards. Follow is the inner chart. 22 ... - Page 23 23 ...
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Page 24: Intro Of Each Little Board
5. Intro of each little board 5.1 Key board It is a resistance differential voltage key and is same to standardizing circuits. Key board has 7 keys: CH+,CH‐,VOL+,VOL‐,MENU,OK and Standby. Follow is the voltages of each key: Key lower upper limit Designed Measure PIN limit of of software value of value software hardware differential voltage CH+ 0.62 1.04 ... - Page 25 MHL detect control circuit as follow. MHL_DET signal will be set to high level by peripheral equipment when MHL peripheral equipment’s line is connect to P801. MHL signal is inputted to Main IC (U104) directly, and is used for Main IC to detect and estimate. Otherwise when MHL is in high level, Q800 is break‐over, Q805 is cut‐off. ...
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Page 27: Troubleshooting Flow Chart
6. Troubleshooting Flow Chart These flow charts may not match every single defeat TV set, but they can give you useful advices when you meet the same defeats described on the titles below. 6.1 Green Power LED does not turn on. The TV is not work. Not work Both no Check 3.3VSTB and 12V/24V Both have Only has Check Power Unit 3.3VSTB Check each Abnormal Check each DC‐DC and DC‐DC unit’s there terminal outputs, ... -
Page 28: Abnormal Display
Many problems may cause the TV can't start up. Firstly，it's need to foreclose the possible bad board（such as main board, key board, panel etc).We can do the right thing only if we find the bad board. The main reasons such as: power supply abnormal, core voltage, DDR's reference voltage, main program abnormal, MBOOT program ... -
Page 29: Abnormal Sound
check the relative channel circuit's component whether have obviously short and virtual jointing. It is need to use forehead method to deal with the covert reason. It is need to check Tuner's outputs for TV source abnormal display. Because of Main IC's high degree of integration, all of the video signals are transmitted to the back end after processed by main IC. All of the sources’ abnormal display may caused by the main IC's abnormal run. So it is need to judge the problem is caused by the main IC or fore‐end circuits. You can do like this: Put the good machine's TV/AV signal into the bad machine's Main IC ,and put the bad machine's TV/AV signal into the good machine's ... - Page 30 PKV 50M14/MT31LB Interconnect P001 P002 LED1- PDIM PDIM LED2- B_ON B_ON LED3- LED4- Back Light Drive V IN V IN LED+ 11 24/60V 24/60V LED+ 12 24/60V 24/60V LED+ 50":PE421C6 13 24/60V 24/60V power 14 24/60V 24/60V P102 +24V +24V +24V +24V +24V...
- Page 32 V1.0 序号 客户物料编码 高频物料编码 物料名称 规格型号 位置 备注 供应商1 供应商2 供应商3 单机量 AI料 1 10-0RL255-EBX G.D.10.0RL255-EB4 整流二极管 RL255 2.5A/600V SDO-15 沂光 D301 D302 沂光 银河 2 10-0SR160-SBX G.D.10.0SR160-SB4 SR160 1A/60V DO-41 沂光 沂光 银河 肖特基二极管 3 10-1N4007-EBX G.D.10.1N4007-EB4 整流二极管 1N4007 1A/1000V DO-41 沂光 D206 D202 沂光...
- Page 33 V1.0 序号 客户物料编码 高频物料编码 物料名称 规格型号 位置 备注 供应商1 供应商2 供应商3 单机量 39 19-BC0104-JTX G.W.19.BC0104-JTX 贴片电阻 100KΩ1/8W +/-5%0805 R443 风华高科 泽天 40 19-BC0122-FTX G.W.19.BC0122-FTX 贴片电阻 1.2KΩ1/8W +/-1%0805 R220 风华高科 泽天 41 19-BC0122-JTX G.W.19.BC0122-JTX 贴片电阻 1.2KΩ1/8W +/-5%0805 R216 R426 风华高科 泽天 42 19-BC0123-FTX G.W.19.BC0123-FTX 贴片电阻...
- Page 34 V1.0 序号 客户物料编码 高频物料编码 物料名称 规格型号 位置 备注 供应商1 供应商2 供应商3 单机量 79 28-BB0104-KBX G.W.28.BB0104-KBX 贴片电容 104/50V+/-10%0805 C217 C426 C425 C211 C401 C415 C420 泽天 三星 80 28-BB0105-KBX G.W.28.BB0105-KBX 贴片电容 105/50V+/-10%0805 C215 C427 C402 C308 泽天 三星 81 28-BB0223-KBX G.W.28.BB0223-KBX 贴片电容...
- Page 35 V1.0 序号 客户物料编码 高频物料编码 物料名称 规格型号 位置 备注 供应商1 供应商2 供应商3 单机量 118 46-40338W-12XG G.D.46.40338W-12XG 插座 2.0间距 2*6双排卧式插座 新富尔 G.D.50.03150D-6GS3G 力特 50-03150D-6GS3G 陶瓷保险丝管 T3.15AH/250V 5*20mm(无引线) Littelfuse G.D.54.866350-2UG Φ3*10mm 顶电源板到屏(K3、K6、及K1下方孔位) 57-866350-2UG 间隔柱 G.D.54.893390-0UG Φ6*18.3mm 57-893390-0UG 间隔柱 电源板K1;K7;K10;K11;K12) 122 64-Z30080-114G G.D.64.Z30080-104 组合镙丝 M3*8 垫片φ6mm FOR QW3 FOR H2 FOR H3 123 64-Z30100-104G G.D.64.Z30100-104...
- Page 36 D301 RL255 US15KB80R 250VAC T3.15AH 470P 0.22U C101 0.22U D302 RL255 470P AGND AGND R321 R307 R308 VCC1 VBUS 240K Q305 R305 S4160T LLC_VCC R309 R333 D303 MUR460 R314 U301 C311 FAN7930C R332 R310 0.47U VBUS Vcc MAX 20-24V BAV70 L301 Vcc ON 11-13V...
- Page 37 D202 C203 R202 R201 P_DIM 1N4007 R208 R203 2200P 450V 330K U201 BL_ON COLD A_DIM FSL206MR Vcc MAX R209 Vcc ON 7-9V AGND P_ON 3.3V/0.2A Vcc OFF 6-8V D206 L201 1N4007 SR160 C211 VSTR 0.1U DRAIN1 AGND R206 D211 C210 DRAIN2 C208 C202...
- Page 38 HOT COLD VBUS LLC_VCC 24V/5A AGND MBR20100CTP C406 L401 0.8UH 0.022U Vcc MAX R412 U401 Vcc ON 11.2-13.8V C411 FSFR1700XS C413 Vcc OFF 8.9-11.1V R445 R444 1000U 1000U C420 C414 0.1U 470U D402 R409 100R D403 AGND C401 R404 D404 0.1U 79C18V MBR20100CTP...