Samsung PS42E7SX Service Manual

Circuit DescriptionSamsung Electronics 13-7■ Requisite Components Necessary for Drive Board Operation1) Power- Supplied from the power board. The optimal value may differ from the following:a) Vs : 200V - Sustainb) Vset : 190V - Y Rising Rampc) Ve : 110V - Ve biasd) Vscan : -190V - Scan low biase) Vsc_h : -70V - Scan high bias (Created by the DC-DC power block of the Y Drive board)f) Vdd : 5V - Logic signal buffer ICg) Vcc : 15V - Gate drive IC2) Logic Signal- Supplied by the Logic board- Gate signal of each switch■ Drive Circuit Architecture and Function Description- Description of the function of each board1) X Drive BoardThis is connected to the X port part of the panel. 1) Sustain voltage waveform (including ERC) is output, and 2) Ve bias in the Scansection is maintained.2) Y Drive BoardThis is connected to the Y port part of the panel. It outputs 1) Sustain voltage wave form (including ERC), and 2) Y Rising, FallingRamp waveform, and maintains 3) Vscan bias.3) Y Buffer BoardA board, which applies the Scan waveform to the Y terminal block, consists of 12 Scan Driver ICs (TI SN755870: 64 Outputs).Y Pole Terminal(4 Block)X Pole Terminal(2 Block)Power B'dLogic B'dLogic E-Buffer Logic F-Buffer- Sustain Pulse(Energy Recovery)- Rising Ramp Pulse- Falling Ramp Pulse- Vscan PulseY-BufferY Drive B'dX Drive B'd- Sustain Pulse(Energy Recovery)- Ve Bias