Samsung PS42P2SBX/XEC, Service Manual

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5-2-3(A) FUNCTIONS OF EACH BOARD
(1) X board
X board is connected to the panel’s X-electrode blocks, 1) generates sustain voltage pulse (including
ERC), 2) generates X rising ramp pulse, and 3) sustains Ve bias during scan period.
(2) Y board
Y board is connected to the Y-electrode blocks of panel, 1) generates sustain voltage pulse (including
ERC), 2) generates Y rising and falling ramp pulse, and 3) sustains Vscan bias.
(3) Y buffer board (upper and lower)
Y buffer board impresses scan pulse to Y electrodes, and consists of upper and lower sub-boards. In
case of SD class, one board is equipped with 4 scan driver IC’s (STMicroelectronics STV7617 with 64
or 65 outputs).
(4) COF
Impresses Va pulse on address electrodes in the address section and generates address discharge
based on a difference between such Va pulse and scan pulse impressed on Y electrodes. It is in the
form of COF, and a COF is equipped with 4 data drive IC’s (STMicroelectronics STV7610A with 96
outputs). For a single scan, 7 COF’s are required.
Circuit Operation Description
5-12 Samsung Electronics
5-2-3 Configuration and Operation Principles of Driver Circuit
Y-Buffer (Upper)
Y-Buffer (Lower)
Y Drive board
- Sustain pulse
(Energy recovery)
- Rising ramp pulse
- Falling ramp pulse
- Vscan pulse
X Drive board
- Sustain pulse
(Energy recovery)
- Rising ramp pulse
- Ve bias
Y-electrode blocks
(6 blocks)
COF X-electrode blocks
(3 blocks)