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PHILIPS FM23 AC
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of PHILIPS FM23 AC Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 137 (click to view)
Circuit Descriptions, List of Abbreviations, and IC Data Sheets
Sync Path All incoming H and V sync signals go to a 4-pole switch (item 7009) where SYNC_SEL and VIDEO_SEL_2 determine, which signal is available on the ADC. Before this switch, the VGA sync path is rather straight, only 1 switch (item 7007) is added for the VGA2 sync signals, which determines if VGA2 sync is input or output (VGA2_OUT). In the Basic configuration, these switches are omitted, and replaced by jumpers (4009/4010). The external sync (AV1 - 3) signals are treated differently. Both H_HD_EXT and V_HD_EXT go to three circuits: � A comparator circuitry with an LM319 (item 7025), to ensure both sync pulses are always positive going (H and V_SYNC_CMP), � A level detection circuitry (items 7000 to 7002), to detect if the sync is of TTL level (H and V_SYNC_TTL), � A positive/negative going detection circuitry (items 7006 to 7010), to indicate the polarity of the sync in case of TTL level (H and V_SYNC_POL_N). All above-mentioned signals go to the EPLD (see diagram SC11) for further processing. Processed sync signals H_HD and V_HD coming from the EPLD, are also switched to the ADC (H_ADC and V_ADC) along with the proper RGB signals (R_ADC, G_ADC and B_ADC). Digital Video This part describes the digital video path on the SCAVIO panel, starting at the AD converters in either the AD9887 (item 7170) or in the SAA7118E (item 7225) and ending at the output for the PDP. For both the Basic as the Enhanced version, everything "after" the Pixel Works chip, is equal. For the Basic version, the input for the Pixel Works only consists of the "Graphics path". For the Enhanced version, it is both the "Graphics path" as the "Video path". The SCAVIO panel contains the following functions in the video path: 1. The "YPbPr to RGB matrix" and "2fH Video+Sync Switch" are explained above in the "Analogue Video" part. 2. The "Digital Video" path containing the Digital Video Decoder and the De-interlacer. 3. The "Digital Graphics" path containing the ADC+TMDS decoder. 4. The "Scaler" which is the Pixel Works (PW164-10R) plus Memory. 5. The "EPLD" for sync decoding and video manipulation. 6. The "LVDS" encoder. The Digital "Graphics Path" This is a straightforward application of the Analogue Devices AD9887 (item 7170). Inputs for this device are: � FTV Receiver box, � � � � VGA formats (up to SXGA at 75 Hz), 2fH RGB+HV (only in Enhanced version), 2fH YPbPr, which is converted to RGB by the "YUV to RGB" matrix (only in Enhanced version), DVI-d (only in Enhanced version).

FM23, FM24, FM33

9.

EN 137

It also is a "must" when a computer graphics card is connected, because there is no, or very little, post anti-aliasing filtering done on such cards. Therefore, the outputted RGB samples need to be exactly aligned with the sampling of the AD converter. Analogue input signals can go up to "SXGA at 75 Hz" format, which gives a pixel clock of 135 MHz. In fact, it can handle any standard with a pixel rate up to 140 MHz. Special modes are made for the F21R E-box, for both PAL and NTSC. These are invoked when an E-box is connected to the SCAVIO panel. Digital input: Via the DVI connector (Enhanced version only) it is possible to insert TMDS (Transition Minimised Differential Signalling) data into the SCAVIO panel. DVI is a fairly new computer graphics standard, which can be seen as the digital follow-up of the analogue VGA interface. The TMDS signal is directly fed into the AD9887, where any DVI standard up to "SXGA at 60 Hz" can be decoded to RGBHV. The preferred VGA standard for this chassis is programmed in the DDC EEPROM (item 7215), which can be read by the PC. Via an internal switch, it is possible to choose between the analogue input and the digital input. The output format is for both inputs the same (8 bit RGB plus HV). The driver determines whether the AD9887 outputs single or dual pixels. For lower standards like "VGA at 60 Hz", the interface will be single pixel, which means that every clock cycle one byte of R, G, and B data is outputted. Dual pixel means that on every clock cycle two bytes of R, G, and B data outputted. These two bytes are de-multiplexed, which is done to make the interface more robust for jitter, set-up, and hold times, and to reduce the digital data rate over the PCB (reduced EMC). Digital "Video Path" This path is only available in the Enhanced version of the SCAVIO panel and is used for the following input signals: � CVBS input, � Y/C input, and � 1fH YPbPr. It is a straightforward application of the Philips SAA7118 (item 7225) and the Micronas SDA9400 (item 7280). The SAA7118 is a PAL/NTSC/SECAM Digital Video Decoder with adaptive digital comb filter and component video input. It decodes all input standards to 4:2:2 YCbCr, which then is processed by the SDA9400. The SDA9400 is a motion adaptive de-interlacer, which makes a progressive video signal from the interlaced input. Depending on the motion in the picture, it will just interleave the odd and even field (no motion: ABAB) or repeats the same field twice; this is also known as line doubling (motion: AABB). The motion detection is pixel based, with a soft-switch between "motion" and "no motion". After the de-interlacer, the signal is fed as a 4:2:2 YCbCr progressive scan signal to the video port of the Pixel Works processor. The Pixel Works PW164 Scaler The Pixel Works PW164 Image Processor is a highly integrated (Ball Grid Array, BGA) chip, which interfaces video inputs and computer graphics in virtually any format to the PDP. Computer images from VGA to UXGA resolution input to the chip can be resized to fit on the PDP. Horizontal and vertical image scalers, coupled with intelligent frame locking circuitry create sharp images, centred on the screen and without user intervention. An embedded DRAM frame buffer and memory controller perform the frame rate conversion. Video data from 4:3 aspect ratio NTSC or PAL and 16:9 aspect ratio sources such as HDTV and DVD are supported. Non-

Analogue input: The AD9887 is meant to sample "pixel synchronous". To achieve this, a (software) driver is running on the Pixel Works processor (PW). After hooking up a source to the AD9887, the PW starts counting the number of lines per field and calculates the H-period time. With these two values, it determines the exact match or the closest match out of a lookup-table (LUT) with VGA standards. When the correct standard is determined, the PW will set the AD9887 I2C registers to the correct value. The AD9887 should now sample with exact the same frequency as the incoming standard requires. This is done to get an optimal picture performance.

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