mytv TLH19 - User Manual

This document is a service manual for a MyTV LED Color TV, Model No.: TLH19. It provides detailed technical information for servicing and understanding the device.

Function Description

The MyTV TLH19 is an LED Color TV. The service manual includes exploded views, mechanical parts lists, and detailed circuit diagrams (schematics) for various components, indicating its primary function as a display device for television broadcasting and external media. The TV incorporates several input and output interfaces, suggesting its capability to connect to a variety of external devices for audio and video playback.

Important Technical Specifications

The manual provides extensive detail on the internal components and their interconnections, which allows for the inference of several technical specifications:

Power Supply:

• Power In: The main power input section includes a FUSE/6A, indicating a maximum current draw of 6 Amperes for the main power line. It generates various internal voltage rails:
  • +12VIN: Main input voltage.
  • +5V_SB (Standby): Generated from +12VIN using an SY8113 buck converter, capable of supplying 3A (though the inductor is rated for 2A, prompting a note about potential inductor upgrade). The output voltage is derived from a 0.6V reference with a resistor divider (R101, R100).
  • +12V_SW & +5V_SW: Switched 12V and 5V rails, controlled by a Q12 (3904) transistor and a PowerON signal.
  • +3V3_SW: Generated from +12V_SW using an SY8120B buck converter, with output voltage set by a resistor divider (R146, R155).
  • +1V: Generated from +12V_SW using an SY8120B buck converter, with output voltage set by a resistor divider (R157, R151).
  • +3V3_SB: Generated from +5V_SB using a BL1117-3.3V linear regulator.
  • +1V5: Generated from +5V_SW using a BL1117-ADJ adjustable linear regulator, with output voltage set by a resistor divider (R105, R103).
  • +2V5: Generated from +3V3_SW via a 1N4148 diode.
  • ADC Power: A dedicated +1V ADC power rail, capable of supplying 300mA, with an FB10R ferrite bead for noise filtering.
• PLL Power/GND (1.0V/2.5V):
  • +2V5_MPLL: Filtered by FB8 (FB10R) and C64 (100nF).
  • +1V_SSPLL: Filtered by FB5 (FB10R) and C36 (100nF).
• DEMO/VIF Power:
  • +3V3_DEMO: Filtered by FB6 (10UH) and C47 (1uF), C45 (10uF).
  • +1V_VIF: Filtered by FB7 (FB10R) and C53 (100nF).
• System PLL:
  • +1V_AVDD: Filtered by FB4 (2.2R) and C37 (1uF), C51 (100nF), C133 (100nF), C79 (100nF).
• ADC Power/GND (1.0V/3.3V):
  • +1V_ADC, +1V_ADCA: Filtered by FB10 (FB10R) and C60 (10uF), C146 (100nF).
  • +3V3_ADCB, +3V3_VDAC: Filtered by FB12 (10UH) and C76 (10uF), C95 (100nF).
  • Note: FBs for ADC need Rdc<0.015, Z=120/100MHz, Idc>3A.
• TMDS Power/GND (1.0V/3.3V):
  • +DVDD33, +3V3_TMDS: Filtered by FB14 (FB10R) and C154 (100nF), C147 (100nF).
  • +1V, +1V_TMDS: Filtered by FB13 (FB10R) and C154 (100nF), C147 (100nF).
• Source Power/GND (1.0V/3.3V):
  • Various pins (Pin3, Pin53, Pin79, Pin113, Pin182, Pin202, Pin236, Pin254, Pin230) are connected to +CVDD, filtered by multiple capacitors (C195, C128, C41, C25, C192, C38, C89, C101).
  • +3V3_SW, +DVDD33: Filtered by FB2 (FB10R) and multiple capacitors (C26, C138, C32, C39).
  • Note: All FBs except ADC, CVDD need Rdc<0.2, Z=300/100MHz, Idc>500mA.
• LVDS PWR:
  • +3V3_SW, +3V3_LVDS: Filtered by C31 (100nF).
• DDR-3 Power:
  • +1V5, +MVDD: Filtered by FB15 (FB10R) and numerous capacitors (C63, C181, C126, C91, C44, C103, C109, C129, C85, C97).
  • Power bypass cap. for VREF: Includes RD16, RD20 (2K_1%), RD14, RD22 (2K_1%), C113, C161 (100nF).

Main Processor:

• SPV9202B (1HDMI)-DDR3-LQFP256: This is the central processing unit, indicating support for HDMI, DDR3 memory, and a LQFP256 package. It integrates various functionalities including:
  • DDR3 Interface: Supports A_DDR3_MD[0..15], A_DDR3_MA[0..13], A_DDR3_DQMH, A_DDR3_DQML, A_DDR3_DQSL, A_DDR3_DQSL#, A_DDR3_DQSH, A_DDR3_DQSH#, A_DDR3_MWE_B, A_DDR3_MRAS_B, A_DDR3_MCAS_B, DDR3_ODT, A_DDR3_MRESET_B, A_DDR3_CLK#, A_DDR3_CLK, A_DDR3_CKE, DDR3_MBA0, DDR3_MBA1, DDR3_MBA2.
  • Crystal Circuit: Uses a 24MHz crystal with 8pF load capacitors.
  • Reset Circuit: Controlled by a push-button and a 10K pull-up resistor.

Memory:

• DDRIII 1G BGA96: A 1 Gigabit DDR3 memory module in a BGA96 package, connected to the SPV9202B.
• SPI Flash: Uses a W25X32VSSIG (32Mbit) SPI flash memory for firmware storage, connected to the SPV9202B via CEN_FLASH, SDO_FLASH, SCK_FLASH, SD1_FLASH lines.

Display Interface:

• LVDS (Low-Voltage Differential Signaling): The TV uses an LVDS interface to connect to the panel module. It includes multiple differential pairs for clock (TXCLK1M/P, TXCLK0M/P) and data (TX1M/P, TX0M/P) signals, supporting various RXO and RXE signals. The VCC-Panel power supply is controlled by a Q6 (GV3407) transistor and a PANEL_ON signal.

Audio:

• Audio Out: Features a TDA1517P audio amplifier, capable of 0-2V standby, 3.3V-6.4V mute, and 8.5V-18V power-on. It provides two output channels (OUT1, OUT2) for speakers (PH LIN, PH RIN).
• PC Audio: Input via a PHONOJACK (J20) with R202, R208 (10K) resistors.
• AV Input: Includes Audio L and Audio R inputs (AVL, AVR) via a PJ-320A connector, with R8, R6 (10K) resistors.
• DVD Input: Includes DVD_AIN2R and DVD_AIN2L inputs via a PJ-339 connector.

Video Inputs:

• PC Analog Input (VGA): Supports VS_VGA, HS_VGA, PC-BIN, PC-GIN, PC-RIN signals, with R182, R183 (33R) resistors for sync signals. It also includes an I2C EEPROM (24C02) for DDC (Display Data Channel) communication.
• SCART Input: Supports CVBSO_IN, SC1_CVBS_OUT, SC1_RIN, SC1_GIN, SC1_BIN, SC1_FS, SC1_AU_LIN, SC1_AU_LOUT, SC1_AU_RIN, SC1_AU_ROUT. It includes a voltage-controlled switch for TV mode (0-2V), 16:9 AV (5-8V), and 4:3 AV (9.5-12V).
• SCART CVBS Out: Output for composite video, controlled by Q19 (3906) and Q18 (3904) transistors.
• YPbPr Input: Supports HD1 Y, HD1 Pb, HD1 Pr signals via a PJ-320A connector.
• DVD Input: Supports DVD Y, DVD Pb, DVD Pr signals via a PH-11A connector.
• HDMI: Supports HPD_HDMI, SDA_HDMI_IN, SCL_HDMI_IN, CEC, CLK-, CLK+, DATA0-, DATA0+, DATA1-, DATA1+, DATA2-, DATA2+. It includes R162 (10K) for HPD_HDMI and R173 (1K) for +5V_HDMI_A.
• Video Switch: Uses an U1 (DVD/X5DV330) switch to select between HD1 Y/Pb/Pr and DVD Y/Pb/Pr inputs, outputting to MUX1 Y/Pb/Pr.

Tuner:

• ATV (Analog TV) Tuner: Uses a Si2158 tuner IC, supporting RF_in, RF_IP, RF_REF, RF_SHIELD, XTAL_I, XTAL_O, SCL, SDA, ADDR, RSTB, GPIO1, GPIO2, GND1, GND2, GND3, AGC1, AGC2, XOUT. It includes a 24MHz crystal.
• DTV IF AGC: Features a DIFAGC signal for Automatic Gain Control.

Backlight:

• The backlight circuit is controlled by BL_ON and BL_ADJ signals. It uses Q10, Q8, Q9 (3904) transistors and resistors (R115, R110, R109, R116, R113, R123, R111) to drive the backlight inverter.
• PH-10A_INVERTER: The inverter module receives +12V and ON/OFF, ADJ signals, and outputs +12V1, +12V2, +12V3.
• Inverter PCB Principle Diagram: Shows a D1, L1, F1, C1, C2, Q1, R34, R3, U1 (9002), D3, R5, ZD2, ZD3, C7, C5, C6, R1, R27, R21, R22, R23, R24, R4 circuit. The U1 (9002) is likely the inverter controller IC.

User Interface:

• Key & IR: Includes a 14-pin connector (J4) for LED_R, LED_G, IR, GND1, K0-K7 (keypad inputs), and POWER. It uses Q15 (3904) for HPD_HDMI, and Q2 (3904) for LED_G_ON.
• USB: Features a J15 connector for USB0_DM, USB0_DP, and +5V_USB, with a F1 (1206/0R) fuse.
• CI (Common Interface): Supports PCMCIA/SOKET (Single) interface with TSO CLK, TSO VAL, TSO SYNC, TSO D[0..7], TSI CLK, TSI VAL, TSI SYNC, TSI D[0..7], CI_REG, CI_CE1, CI_CE2, CI_OE, CI_WE, CI_IORD, CI_IOWR, CI_RDY, CI_RST, CI_A[0..14], CI_D[0..7], CIIN_CD1, CI_WAIT. It can operate in 8-bit mode.

Usage Features

Based on the provided schematics and parts list, the MyTV TLH19 offers the following usage features:

• Multi-standard TV Reception: The presence of an ATV tuner (Si2158) indicates the ability to receive analog television broadcasts.
• Multiple Video Inputs:
  • HDMI: For high-definition digital video and audio from devices like Blu-ray players, gaming consoles, and set-top boxes.
  • VGA (PC Analog Input): For connecting to personal computers or laptops.
  • SCART: A legacy connector for older video equipment (VCRs, DVD players), supporting composite video and RGB signals.
  • YPbPr (Component Video): For high-quality analog video from DVD players or other component video sources.
  • AV (Composite Video): For standard-definition analog video from various sources.
  • DVD: Dedicated input for DVD players.
• Multiple Audio Inputs/Outputs:
  • PC Audio Input: For audio from a connected PC.
  • AV Audio Input: For audio accompanying composite video.
  • DVD Audio Input: For audio accompanying DVD video.
  • Audio Output (TDA1517P): For driving external speakers.
  • SPDIF Output: For digital audio output to home theater systems.
• USB Connectivity: For connecting USB devices, likely for media playback or firmware updates.
• Common Interface (CI) Slot: For conditional access modules (CAMs) to decrypt pay-TV channels, indicating support for digital TV services (though the specific digital tuner type is not detailed, the CI slot strongly implies DTV capability).
• Remote Control and On-Device Keypad: The "Key & IR" section indicates both infrared remote control capability and physical buttons on the TV for basic operations.
• LED Backlight: Utilizes an LED backlight system for display illumination, which typically offers better energy efficiency and contrast compared to traditional CCFL backlights.

Maintenance Features

The service manual is primarily designed for maintenance and repair, offering several features that aid in servicing the device:

• Exploded View and Mechanical Parts List: Provides a clear breakdown of the TV's physical components, including the panel module, lamp lens, remote assembly, inverter, terminal bases, speaker, rubber pad cord, glass base, display bracket, TV cab, function key assembly, TV control key PCB assembly, and drive PCB. This is crucial for disassembly, reassembly, and identifying replacement parts.
• Detailed Schematics (Driver PCB Principle Diagram, Inverter PCB Principle Diagram): These diagrams are the core of the service manual, providing:
  • Component Identification: All components (resistors, capacitors, ICs, transistors, diodes, inductors, connectors) are clearly labeled with their designators (e.g., R1, C1, U1, Q1, D1, L1, J1, CN1).
  • Circuit Tracing: Allows technicians to trace signal paths and power distribution throughout the various boards (Driver PCB, Inverter PCB).
  • Voltage Rails: Clearly indicates the different voltage rails (+12VIN, +5V_SB, +3V3_SW, +1V, +1V5, +2V5, +1V_ADC, etc.), which are essential for troubleshooting power-related issues.
  • Test Points (TP): Some schematics include test points (e.g., TP3, TP6, TP7, TP5, TP4, TP1), which are designated locations for measuring voltages or signals during diagnostics.
  • Component Values: Most components have their values specified (e.g., 10K for resistors, 100nF for capacitors, 6.8uH/3A for inductors), enabling accurate component replacement.
  • IC Pinouts: Pin numbers and functions for integrated circuits (e.g., SY8113, BL1117, SY8120B, W25X32VSSIG, TDA1517P, Si2158, SPV9202B) are provided, which is vital for checking their operation and identifying faulty ICs.
  • Ferrite Beads (FB): The use of ferrite beads (e.g., FB9, FB10, FB12, FB13, FB14, FB15, FB2, FB6, FB7, FB4, FB8, FB11) for noise filtering is indicated, which helps in diagnosing electromagnetic interference (EMI) issues.
  • Grounding Information: Specific notes like "Short these ground planes on PCB" (for SPV9202E E-Pad) are provided, highlighting critical grounding requirements for proper operation and noise reduction.
• Interconnection Details: The manual shows how different modules and PCBs connect to each other (e.g., Driver PCB to Inverter PCB, main board to panel, tuner connections), which is crucial for identifying connection faults.
• Specific Notes for Troubleshooting: For instance, the note about the +5V_SB inductor rating ("+5V SB输出3A电流,而电感只有2A,是否需要使用更大的电感") directly points to a potential area for improvement or troubleshooting if the 5V standby rail experiences issues under load. Similarly, notes about FB specifications (Rdc, Z, Idc) are valuable for ensuring correct replacement parts are used.
• Power-on/Standby Control: The presence of PowerON, BL_ON, PANEL_ON, and MUTE signals, along with their associated control circuits, allows for systematic troubleshooting of power-up sequences and display/audio activation issues.

Overall, this service manual provides comprehensive technical documentation essential for the diagnosis, repair, and maintenance of the MyTV TLH19 LED Color TV.