ViewSonic VA1930wm-1, Service Manual

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VA1930wm-1
2
4
6.6 CN102 (DVI Connector)
Pin Symbol Pin Symbol Pin Symbol
1 T.M.D.S.Data2- 9 T.M.D.S.Data1- 17 T.M.D.S.Data0-
2 T.M.D.S.Data2+ 10 T.M.D.S.Data1+ 18 T.M.D.S.Data0+
3
T.M.D.S.Data2/4
Shield
11
T.M.D.S.Data1/3
Shield
19 T.M.D.S.Data0/5 Shield
4 T.M.D.S.Data4- 12 T.M.D.S.Data3- 20 T.M.D.S.Data5-
5 T.M.D.S.Data4+ 13 T.M.D.S.Data3+ 21 T.M.D.S.Data5+
6 DDC Clock 14 +5V Power 22 T.M.D.S.clock Shield
7 DDC Data 15 Ground(for+5V) 23 T.M.D.S.Clock+
8 No Connect 16 Hot Plug Ddtect 24 T.M.D.S.Clock-
7. Key Parts Pin Assignment
7.1 IC802 (TOP245Y or TOP246Y, Power Control IC)
Pin Symbol I/O Description
1 C I Control
2 L I Line Sense
3 X I External Current Limit
4 S O Source of MOSFET(GND)
5 F I Frequency
6 D I Drain of MOSFET
7.2 IC501 (OZ9938GN, CCFL inverter controller IC)
Pin No. Symbol I/O Description
1 DRV1 O Drive output
2 VDDA I Supply voltage input
3 TIMER I Timing capacitor to set striking time and shut down delay time
4 DIM I
Analog dimming or Internal LPWM dimming or external PWM
pulse input for dimming function
5 ISEN I Current sense feedback
6 VSEN I Voltage sense feedback
7 OVPT I Over-voltage/over-current protection threshold setting pin
8 NC
9 NC
10 ENC I ON/OFF control of IC
11 LCT I
Timing capacitor to set internal PWM dimming frequency and
also a pin for analog dimming selection
12 SSTCMP I Capacitor for soft start time and loop compensation