
Do you have a question about the Philips 21PT9457 and is the answer not in the manual?
| aspect ratio | 4:3 |
|---|---|
| diagonal screen size | 21 inch / 53 cm |
| visible diagonal screen size | 51 cm |
| output power (RMS) | 2 x 3W |
|---|---|
| sound system | Stereo, SAP |
| sound enhancement | Balance, Incredible Surround, Treble and Bass Control |
| aerial input | 75 ohm F-type |
|---|---|
| number of preset channels | 181 |
| tv system | NTSC, PAL M, PAL N |
| mains power | AC 100-240V, 50/60Hz |
|---|---|
| power consumption | 72 W |
| standby power consumption | <3W |
| set dimensions (W x H x D) | 594 x 461 x 327 mm |
|---|---|
| box dimensions (W x H x D) | 660 x 532 x 396 mm |
| product weight | 20 kg |
Details about display, sound, and miscellaneous technical aspects of the television.
Explains connector color codes and lists rear/side connections with specifications.
Provides a visual overview of the chassis components and their physical layout.
Guidelines for safe repair procedures, component replacement, and post-repair checks.
Recommendations for periodic maintenance and inspection intervals based on usage.
Important cautions regarding high voltage, ESD, and safe tool usage during service.
General notes on measurement conditions, Dolby trademarks, and component interchangeability.
Explains conventions for resistor and capacitor values in schematics.
Guidelines and precautions for performing lead-free soldering.
Explains how to identify different Bill of Materials (BOM) versions using serial numbers.
General safety precautions for service technicians regarding electrical shock.
Step-by-step guide for disassembling the television set, including rear cover removal.
Instructions for removing and replacing internal boards like the side I/O panel.
Guidance on reassembling the television after repairs, ensuring correct component placement.
Reference to test points described in chapter 6 for measurements.
Information on accessing factory and service modes for adjustments.
States that error codes are not applicable for this specific model.
Troubleshooting guide for common TV issues like power failure and picture problems.
High-level block diagram illustrating the main sections of the TV chassis.
Overall schematic diagram providing a consolidated view of the chassis circuitry.
Circuit diagram for the power supply unit.
Circuit diagram for the line deflection system.
Circuit diagram for the frame deflection system.
Circuit diagram for the tuner and IF section.
Circuit diagram for the AV switching circuitry.
Circuit diagram for the optional tone control module.
Circuit diagram for the audio amplifier stage.
Circuit diagram for the CPU and decoder section.
PWB layout for the mono carrier, top view.
PWB layout for the mono carrier, bottom view.
Circuit diagram for the keyboard control panel.
PWB layout for the keyboard control panel, top side.
PWB layout for the keyboard control panel, bottom side.
Circuit diagram for the main switch panel.
PWB layout for the main switch panel, top side.
Circuit diagram for the side AV panel.
PWB layout for the side AV panel.
Circuit diagram for the BTSC panel.
PWB layout for the BTSC panel, top side.
PWB layout for the BTSC panel, bottom side.
Circuit diagram for the Slim EW panel.
PWB layout for the Slim EW panel.
Circuit diagram for the optional subwoofer panel.
PWB layout for the subwoofer panel.
Conditions required for performing electrical adjustments, including power supply and warm-up.
Details on hardware adjustments, specifically the main voltage (B+) adjustment.
Steps for accessing and performing software-based alignments via the factory menu.
Procedure to adjust RF AGC voltage for optimal reception.
Procedure to adjust focus using the flyback transformer knob for picture clarity.
Procedure to adjust screen voltage for picture brightness and level line.
Procedure to adjust horizontal picture centering using HPH parameter.
Adjustments for vertical and horizontal picture geometry and display ratio.
Procedure to adjust the position of the On-Screen Display (OSD) and LOGO.
Overview of the SK4.0A CA chassis and the manual's chapter structure.
General descriptions of the TV's functional circuits like tuner, IF, and sound channels.
Shows internal block diagrams and pin layouts of key ICs used in the TV.
Glossary of technical abbreviations used throughout the service manual.
Block diagram and pin configuration for IC601 (W6554A).
Pin configuration diagram for IC602 (P412).
Block diagram and pin configuration for IC301 (TDA486x).
Block diagram and pin configuration for IC102 (4052).
Block diagram and pin configuration for IC402 (TDA9842).
Block diagram and pin configuration for IC801 (TDA9850).
Block diagram for IC201 (OM837x).
Block diagram and pin configuration for TDA937x (IC201).
Block diagram for IC202 (24C08).
List of spare parts categorized by set level.
General list of various spare parts not specific to a board.
Spare parts list specifically for the main board.
Spare parts list for the keyboard and control panel components.
Spare parts list for the BTSC panel.
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