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This document is a service manual for a Parker 24-inch LCD TV, model TL24V1. It provides essential information for technicians regarding the device's operation, safety, and troubleshooting.
The manual begins with a "CAUTION" section, emphasizing the importance of adhering to specified controls, adjustments, and procedures to avoid hazardous radiation exposure. It highlights the risk of electric shock and explicitly states that the cover or back should not be removed by unauthorized personnel, directing all servicing to qualified service personnel. The presence of a lightning flash with an arrowhead symbol warns of uninsulated "dangerous voltage" within the product, while an exclamation point within an equilateral triangle points to important operating and maintenance instructions in the accompanying literature. A general warning advises against exposing the appliance to rain or moisture to reduce the risk of fire or electric shock.
The "Important Safety Instructions" section provides a comprehensive list of guidelines for personal safety and proper device handling. Users are instructed to read and retain all safety and operating instructions, heed all warnings, and follow all use instructions. Specific warnings include unplugging the television if the power cord or plug is damaged, avoiding overloading wall outlets and extension cords to prevent fire or electric shock, and ensuring nothing rests on or rolls over the power cord. Users are strictly advised against attempting to service the television themselves due to the risk of dangerous voltage and other hazards. It also warns against pushing objects into cabinet slots or spilling liquid onto the television, as these actions could lead to fire, electric shock, or damage. If the television is dropped, the cabinet is damaged, or liquid is spilled, it should be unplugged and referred to qualified service personnel. The manual also cautions against subjecting the television to impact, particularly the picture tube surface. For cleaning, users should unplug the set and use a damp cloth, avoiding liquid or aerosol cleaners. Finally, it advises against placing the television on an unstable cart, stand, or table to prevent falls and serious injury, recommending only manufacturer-approved carts or stands and proper wall or shelf mounting. When moving an appliance and cart combination, care should be taken to avoid quick stops, excessive force, and uneven surfaces that could cause overturning.
The "Protection And Location Of Your Set" section offers guidance on the optimal placement and environmental conditions for the television. It advises against using the television near water sources like bathtubs, washbowls, kitchen sinks, laundry tubs, wet basements, or swimming pools, and explicitly states that the set should not be exposed to rain or water. If exposure occurs, the set should be unplugged and referred for servicing. The manual suggests choosing a location where artificial or sunlight does not shine directly on the screen to enhance viewing experience. It also warns against dusty places, as dust accumulation inside the TV chassis can lead to failure in high humidity conditions. The television cabinet features slots and openings for ventilation to ensure reliable operation and prevent overheating. These openings must not be blocked or covered by cloth or other materials, nor should the bottom ventilation slots be obstructed by placing the set on a bed, sofa, or rug. The television should not be placed near radiators or heat registers, or within a "built-in" enclosure without proper ventilation.
For external antenna systems, the manual provides detailed grounding instructions in accordance with Section 810 of the National Electrical Code, NFPA No. 70-1975. This includes proper grounding of the mast, supporting structure, lead-in wire to an antenna discharge unit, grounding conductors, and connection to a grounding electrode. An example diagram illustrates the antenna grounding as per NEC instructions. For CATV systems, installers are reminded of Article 820-40 of the NEC, which specifies that the cable ground should be connected to the building's grounding system as close to the point of cable entry as practical. Users are warned against locating an outside antenna system near overhead power lines or other electric circuits, as contact with them could be fatal. For added protection during lightning storms or extended periods of disuse, the television should be unplugged from the wall outlet and the antenna disconnected to prevent damage from lightning and power-line surges.
The "Factory Menu" section details how to access and navigate the service menu, which is crucial for technicians. There are two ways to access it: either by pressing the "Menu" button, selecting "Contrast" in the "Picture" submenu, and then pressing 9, 7, 3, 5 consecutively; or by pressing the "Go Back" button when the "FAC HOTKEY" item in the "Factory Menu" is enabled (ON). The Factory Menu includes items such as "FAC HOTKEY" (a shortcut button switch that must be disabled after production), "WARM UP" (for normal or aging mode), "ADC" (for ADC calibration), "WHITE BALANCE" (for white balance adjustment), "SHOP" (a crucial function to clear production information and prevent user access to the Factory Menu), and "NVM RESET" (to restore default values except WB and ADC data). Other items include "SET FAC CH" (to preset the channel table), "POWER ON" (to set power-on status), "USB UPDATE" (for software upgrades), "FAC CH SEL" (to select the factory of production), "SW VERSION" (software version information), "SW DATE" (software release date and time), "PRODUCT" (product model), and "SIACP VERSION" (serial port remote control protocol).
The "ADC calibration menu" and "White Balance Adjustment menu" provide detailed instructions for calibrating the Analog-to-Digital Converter and adjusting white balance, respectively. These sections list various parameters such as "SOURCE," "AUTO TUNE," "R OFFSET," "G OFFSET," "B OFFSET," "R GAIN," "G GAIN," and "B GAIN," along with their default values and descriptions. Notes specify that only YPBPR and PC sources should be calibrated for ADC, and only HDMI1, AV1, YPBPR, and PC sources should be adjusted for white balance.
The "Chassis Block Diagram" and "PCB Diagram" sections offer visual representations of the television's internal architecture and circuit board layouts. These diagrams are essential for technicians to understand the interconnections between different components and troubleshoot hardware issues.
Finally, the "Trouble Shooting" section provides flowcharts to guide technicians through common problems and their solutions. These flowcharts cover scenarios such as "Standby power OK, TV can't send power on signal," "Power OK, no backlight, no raster," "Power OK, backlight OK, no raster," "All the source no picture," "AV no picture," "VGA/YPbPr no picture," "HDMI no picture," "TV no picture," and "Picture OK, all source no sound." Each flowchart directs the technician to check specific components or signals and suggests replacement or repair actions based on the diagnostic outcome. For instance, if the TV can't send a power-on signal, the technician is guided to check the U801 output and replace U801, U201, or X201 if necessary. Similarly, for issues like no backlight or no raster, the flowcharts direct checks of power supply components (U808, U807, U804, U805, U810) and main control components (X201, U202, U204, U201). Audio-related issues lead to checks of earphone and AV audio output, signals on U601, and U601 itself. These structured troubleshooting steps help streamline the repair process and ensure efficient problem resolution.
The manual concludes with an "Exploded View" diagram, which illustrates the disassembled components of the television, and a "Parts List," providing a comprehensive inventory of all parts with their respective part numbers, materials, and quantities. This information is critical for ordering replacement parts and reassembling the device correctly. The final page includes "SERVICE SUPPORT" contact information, directing questions or technical support to "soporte@parker-electronics.com."
General| Display Technology | LCD |
|---|---|
| Screen Size | 24 inches |
| Aspect Ratio | 16:9 |
| HDMI Ports | 1 |
| USB Ports | 1 |
| VGA Port | 1 |
| Built-in Speakers | Yes |
| Resolution | 1366 x 768 |
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