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PSSG PHILIPS SERVICE SOLUTIONS GROUP PHILIPS TECHNICAL TRAINING F8 COLOR TV CHASSIS P H I L I P S Philips Technical Training (USA) 401 E. Old Andrew Johnson hwy TECH TRAINING PO box 555 Jefferson City, TN 37760 VIDEOT A P E S PH: 865-475-0397 FAX: 865-475-0221 MANUALS EMAIL: [email protected] F8 COLOR TV CHASSIS INTRODUCTION. ALWAYS USE AN ISOLATION TRANSFORMER WHEN SERVICING THIS CHASSIS FOR YOUR SAFETY. The F8 chassis is a leader TV chassis produced by Philips Consumer Electronics Company for SIGNAL FLOW the 1999 model year. (Figure 1) The F8 is used in sets with 25, 27, The incoming RF signal is and 32 inch screen sizes. The F8 applied to the U/V tuner where chassis is a global design and is the 45.75 MHz IF signal is oriented front to rear, or "north developed and amplified. The IF to south", as it has been called. signal then exits the tuner from The F8 chassis tuning system pin10 to pass through the SAW features 181 channels with on- filter. The shaped signal is screen display. The main tuning then applied to IC 7250, the IF system uses a tuner, a processor. The automatic gain microcomputer IC, and a memory IC control (AGC) is performed in IC mounted on the main chassis. The 7250 and applied to the U/V microcomputer communicates with the tuner at pin 1. An automatic memory IC, the customer keyboard, fine tuning signal (AFT) is also remote receiver, U/V tuner, signal generated in the IC and then processor IC and the audio output routed to the tuning system via IC via the I2C bus. The memory IC the I2C bus, to provide retains the settings for favorite frequency correction as needed. stations, customer preferred settings, and service/factory data. Composite Video is output on Pin 6 of 7250 and buffered by The F8 chassis uses a Very Large transistor 7266. In Mono Audio Scale (VLSI) Integrated Circuit for sets, the signal is applied to signal processing. This IC performs 1001, 4.5 MHz Band Pass Filter, video IF, sound IF processing, AGC and then applied to Pin 1 and control, horizontal and vertical the Audio Demodulator circuit. drive and synchronization, also Audio is then output on Pin 15 Luminance/Chrominance processing. and applied to the Audio The on-screen graphics and closed Amplifier 7953. Volume level is caption decoding are done within controlled at the Audio