Samsung PDP4294X/SMS, Service Manual

Page: 37 / 104

Circuit Operation Description
Samsung Electronics 5-23
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X Board
Connected to the X terminals on the panel. Maintains
1) the sustain voltage waveforms(including ERC) and
2) the Ve bias during scan time
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Y Board
Connected to the Y terminals on the panel. Maintains
1) the sustain voltage waveform(including ERC)
2) the Vscan bias, and generates
3) the Y rising/falling ramp waveform.
#
Y Buffer Board(Upper, Lower)
Applies the scan waveform to the Y terminals. Consists of two boards, the upper and lower board. In
preparation for the SD level, four scan driver IC
S
(STMicroelectronics’s STV7617:64 or STV7610A:963
outputs). When a single scan occurs, 7COF
S
are required.
$
COF
Utilizes the Va pulses on the address electrodes to form an address discharge by using the differences
between the beamed pulses occurring on the Y electrodes. It is manufactured in the COF form. Each
COF consists of data drive ICs (STMicroelectronics’s STV7610A: 96 outputs). When a single scan
occurs, 7 COFs are required.