Vertical Deflection
The Frame stage consists fully of discrete components. This has the advantage for
better flash behavior than when an IC was used.
The Frame differential drive signal from the Hercules comes from a current source.
Resistors R3460 and R3461 convert them into a voltage, and feed them into the
differential amplifier TS7455 and TS7456. The output of TS7456 is input to the next
amplification stage of TS7452. Finally, TS7451 and TS7453 deliver the Vertical yoke
current to the coil and feedback through the sensing resistors R3471 and R3472.
D6458 and TS7454 are used to bias TS7451 and TS7453, to get rid of zero crossovers,
which can cause horizontal lines at the screen center.
The negative supply is from -12V and the positive scanning supply is from +12V through
D6459. The flyback supply is derived from D6455, D6456 and C2456. This circuit is a
voltage doubler, which stores energy in C2456 during the Line flyback period and
delivers the energy to C2465 during the Line scanning period. Throughout the Frame
period, the charging and discharging of C2456 works alternatively. However, at the first
half of the Frame scanning, TS7451 is “on” and consumes all the charge from C2456.
When entering 2nd half Frame period, TS7451 is “off”, so C2456 will gradually charge
up to the required flyback supply.
C2463, R3464 and D6457 are for boosting the base voltage of TS7451 during the
flyback period and the 1st half Frame period as well. C2463 is charged by D6457 during
the 2nd half scanning. R3467 and R3468 are for oscillation damping.
The V_guard protection is to protect the Frame stage if a fault condition happens. The
V_guard will sense the pulse with voltage > 3.8 V and period < 900 us. Any signal out of
this range will be considered as fault, and the chassis will be shut down.
Содержание 29PT6441/85
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Страница 35: ...Figure Service position Mono Carrier ...
Страница 69: ...Power Supply Set Not Working Figure Fault finding tree Set not working ...
Страница 70: ...Set Does Not Start Up Figure Fault finding tree Set does not start up ...
Страница 73: ...Blank Screen Figure Fault finding tree Blank screen ...
Страница 76: ...Picture Ok No Sound Figure Fault finding tree Picture ok no sound ...
Страница 77: ...Unable To Perform Tuning Figure Fault finding tree Unable to perform tuning ...
Страница 80: ...Audio Processing No Sound Figure Fault finding tree No sound ...
Страница 83: ...Hardware Alignments Figure Top view family board ...
Страница 86: ...Software Alignments and Settings Figure Service Mode overview ...
Страница 118: ...Figure Geometry alignments ...
Страница 172: ...All Models 7661 Chassis Overview ...
Страница 173: ...All Models 7661 Power Supply A1 ...
Страница 174: ...All Models 7661 Deflection A2 ...
Страница 175: ...All Models 7661 Tuner IF A3 ...
Страница 176: ...All Models 7661 Hercules A4 ...
Страница 177: ...All Models 7661 Features Connectivities A5 ...
Страница 178: ...All Models 7661 Class D Audio Amplifier A6 ...
Страница 179: ...All Models 7661 Audio Amplifier A7 ...
Страница 180: ...All Models 7661 Rear I O Cinch A8 ...
Страница 181: ...All Models 7661 Front Control A9 ...
Страница 182: ...All Models 7661 DVD Power Supply A10 ...
Страница 183: ...All Models 7661 CRT Panel B1 ...
Страница 184: ...All Models 7661 Eco Scavem B2 ...
Страница 185: ...All Models 7661 Side AV Headphone Panel D ...
Страница 186: ...USED ONLY IN MODELS 25PT6341 85 7661 Side Jack Panel Wide ...
Страница 187: ...NOT USED IN MODELS 25PT6341 85 27MS6341 37 27PT5441 37 32MS6341 37 32PT5441 37 33PT5441 85 7661 Top Control Panel E ...
Страница 188: ...USED ONLY IN MODELS 27MS6341 37 32MS6341 37 7661 Top Control Panel Round ...
Страница 189: ...USED ONLY IN MODELS 26PW6341 37 28PW6341 85 30PW6341 37 32PW6341 85 7661 Linearity Panorama Panel G ...
Страница 190: ...NOT USED IN MODELS 27ST6210 27 7661 LTI CTI Interface Panel H ...
Страница 191: ...NOT USED IN MODELS 25PT6341 85 27PT5441 37 32PT5441 37 33PT5441 85 7661 Front Interface Panel J ...
Страница 192: ...USED ONLY IN MODELS 27ST6210 27 7661 EPS Module ...
Страница 193: ...USED ONLY IN MODELS 27ST6210 27 7661 SP LS Module ...
Страница 194: ...USED ONLY IN MODELS 27ST6210 27 7661 ITV Interface Module ...
Страница 195: ...All Models 7661 Layout Mono Carrier Top Side ...
Страница 196: ...All Models 7661 Layout Mono Carrier Overview Bottom Side ...
Страница 197: ...All Models 7661 Layout CRT Panel Top Side ...
Страница 198: ...All Models 7661 Layout CRT Panel Bottom Side ...
Страница 199: ...All Models 7661 Layout Side AV Headphone Panel Top Side ...
Страница 200: ...All Models 7661 Layout Side AV Headphone Panel Bottom Side ...
Страница 201: ...USED ONLY IN MODELS 25PT6341 85 7661 Side Jack Panel Wide Top Side ...
Страница 202: ...USED ONLY IN MODELS 25PT6341 85 7661 Side Jack Panel Wide Bottom Side ...
Страница 205: ...USED ONLY IN MODELS 27MS6341 37 32MS6341 37 7661 Top Control Panel Round Top Side ...
Страница 206: ...USED ONLY IN MODELS 27MS6341 37 32MS6341 37 7661 Top Control Panel Round Bottom Side ...
Страница 207: ...USED ONLY IN MODELS 26PW6341 37 28PW6341 85 30PW6341 37 32PW6341 85 7661 Layout Linearity Panorama Panel Top Side ...
Страница 208: ...NOT USED IN MODELS 27ST6210 27 7661 Layout LTI CTI Interface Panel Top Side ...
Страница 209: ...NOT USED IN MODELS 27ST6210 27 7661 Layout LTI CTI Interface Panel Bottom Side ...
Страница 210: ...NOT USED IN MODELS 25PT6341 85 27PT5441 37 32PT5441 37 33PT5441 85 7661 Layout Front Interface Panel Top Side ...
Страница 211: ...NOT USED IN MODELS 25PT6341 85 27PT5441 37 32PT5441 37 33PT5441 85 7661 Layout Front Interface Panel Bottom Side ...
Страница 212: ...USED ONLY IN MODELS 27ST6210 27 7661 EPS Module Top Side ...
Страница 213: ...USED ONLY IN MODELS 27ST6210 27 7661 SP LS Module Top Side ...
Страница 214: ...USED ONLY IN MODELS 27ST6210 27 7661 SP LS Module Bottom Side ...
Страница 215: ...USED ONLY IN MODELS 27ST6210 27 7661 ITV Interface Module Top Side ...
Страница 216: ...USED ONLY IN MODELS 27ST6210 27 7661 ITV Interface Module Bottom Side ...
Страница 217: ...All Models 7661 Testpoint Overview Mono Carrier ...
Страница 218: ...All Models 7661 Testpoint Overview CRT ...
Страница 219: ...All Models 7661 Testpoint Overview LTI Panel ...
Страница 220: ...All Models 7661 Wiring Diagram ...
Страница 221: ...All Models 7661 Block Diagram Supply and Deflection ...
Страница 222: ...All Models 7661 Block Diagram Video ...
Страница 223: ...All Models 7661 Block Diagram Audio Control ...
Страница 224: ...All Models 7661 I2C and Supply Voltage Overview ...