Toshiba 32WH37G, Service Manual

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Features:
n all-digital video processing
n high-performance adaptive 4H comb filter Y/C separator with adjustable vertical peaking
n multi-standard color decoder PAL/NTSC/SECAM including all substandards
n 4 composite, 1 S-VHS input, 1 composite output
n integrated high-quality A/D converters and associated clamp and AGC circuits
n multi-standard sync processing
n linear horizontal scaling (0.25 ... 4), as well as non-linear horizontal scaling ‘panorama vision’
n PAL+ preprocessing (VPC 3215)
n line-locked clock, data and sync output (VPC 3215)
n display/deflection control (VPC 3205)
n submicron CMOS technology
n I²C-Bus Interface
n one 20.25 MHz crystal, few external components
n 68-pin PLCC package
Pinning:
1 Ground 35. Ground
2 Ground 36. Supply Voltage
3 5 MHz Clock Out 38 47. Picture Bus Chroma
4 Standby Supply Volt 48 50. Picture Bus Priority
5 Analog Crystal Out 51. Ground
6 Analog Crystal In 52. VGAV Input
7 Ground 53. Front-End/ Back-End Data
9 Ground 54. Reset Input, Active Low
10 Interlace Out 55. I²C Bus Data
12 Vertical Sync Pulse 56. I²C Bus Clock
13 Front Sync Pulse 57. Test Pin, connect to GND
14 Main Sync/Horiz Sync Pulse 58. Video 4 Analog Input
15 Helper Line Output 59. Ground
16. Horz Clamp Pulse 60. Video 3 Analog Input
17. Active Video Out 61. Video 2 Analog Input
18. Double Output Clock 62. Video 1 Analog Input
19. Output Clock 63. Chroma/ Video 4 Analog Input
20...29.Picture Bus Luma 64. Analog Video Output
26. Ground 65. Analog Shield GND F
27. Not Connected 66. Supply Voltage, Analog Front-End
30. Main Clock Output 20.25 MHz 67. Signal Ground for Analog Input
31. Supply Volt 68. Reference Voltage Top, Analog
34. Ground
CIP3250:
The IC is used to interface the analog input, which is output from the PIP module (SCART RGB or PIP RGB).
As can be seen from the block diagram, there is a CT-BR-SAT block, which is used for luma contrast, brightness, hue,
and color saturation correction. The soft mixer is controlled by the fast blank signal.
Features:
n analog input for RGB or YUV and Fast Blank
n triple 8 bit analog to digital converters for RGB/YUV with internal programmable clamping
n single 6 bit analog to digital converter for Fast Blank signal
n digital matrix RGB % YUV (Y, B–Y, R–Y)
n luma contrast and brightness correction for signals from analog input
n color saturation and hue correction for signals from analog input
n digital input for DIGIT 2000 or DIGIT 3000 formats
n digital interpolation to 4:4:4 format
n high quality soft mixer controlled by Fast Blank signal
n programmable delays to match digital YUVin and ana-log RGB/YUV
n variable low pass filters for YUV output
n digital output in DIGIT 2000 and DIGIT 3000 formats, as well as RGB 4:4:4
n I²C bus interface
n clock frequency 13.5... 20.25 MHz