File information: | |
File name: | v771_v772.pdf [preview v771 v772] |
Size: | 412 kB |
Extension: | |
Mfg: | Acer |
Model: | v771 v772 🔎 |
Original: | |
Descr: | LCD Monitor |
Group: | Electronics > Computer equipment > Monitors |
Uploaded: | 15-08-2018 |
User: | plamensl |
Multipart: | No multipart |
Information about the files in archive: | ||
Decompress result: | OK | |
Extracted files: | 1 | |
File name v771_v772.pdf V772 CRT Monitor Service Guide Circuit Operation Theory ACER V772 DEFLECTION CIRCUIT OPERATION THEORY 1. The Block Diagram of Deflection: H-sync Digital Tilt Rotation V-sync Controller Circuit C il I2C BUS AutoSync Deflection Controller IC TDA4856 Vertical Deflection Output Step Up IC TDA4866 for B+ G1 & Spot Dynamic Killer Circuit Focus H-SIZE Compensation Shut down Circuit G1 Dynamic Regulation Feedback Horizontal Deflection Output Circuit 1 Confidential V772 CRT Monitor Service Guide Circuit Operation Theory 2. Autosync Deflection Controller (TDA4856) 2.1 pin 1 is AFC feedback. 2.2 pin XRAY: if V XRAY > threshold (6.25V typical) switches the whole IC into protection mode. 2.3 pin 3,4,5,6,8 for B+ control function block. 2.4 pin 11(EWDRV) is a parabolic waveform used for pincushion correction 2.5 pin 16 generates video claming & blanking pulse. 2.6 pin 18,19 is I2C data. 2.7 pin 21 V-regulation. 2.8 the resistor from pin 28 (HREF) to ground determines the maximum oscillator frequency. 2.9 the resistor from pin 27 (HBUF) to pin 28 defines the frequency range. 2.10 pin 31 H-regulation. 2.11 pin 32 focus. +48V ZD204 +14V |
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