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Teletest Ltd, 4 Shelley Road, Bournemouth, Dorset, BH1 4HY, UK
Tel: 01202 646100 • Fax: 01202 646101 • Intl: +44 1202 etc sales-uk@teletest.net
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Technical Support: 19" LCD rack
99.9% of ALL reported problems are finger trouble! We can sort almost all problems out over the phone; try following the Q & A below and if you are having no luck then give us a call.
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POWER
Q: Why do I have no picture on the screens of my LCD rack?
A: Ensure the rack is turned on.
A: Ensure there a power supply connected to the XLR4 socket.
NOTE: The LEDs will be on if there is power applied to the rack.
PICTURE SOURCE
Q: The LEDs are on / backlight is glowing; why do I still have no picture on the screens of my LCD rack?
A: Ensure the cable is connected to the right input.
A: Ensure all the picture controls are set mid way.
A: Ensure the push button switch at the back is "out" for a PAL/NTSC signal, or "in" for an SDI signal.
A: Ensure there is a picture coming down the cable.
SUGGESTION: You can check there is a picture on the cable by connecting the cable into another input on the LCD rack or by connecting the cable into a different monitor or an oscilloscope.
LCD SCREENS
Q: Why are the angle of views on the LCD screens on the rack very poor?
A: Ensure the brightness is not turned down.
A: Ensure the screens are not positioned too far to the left or right of the operator.
NOTE: This question usually comes up from system integrators installing LCDs for the first time, to the spec of a customer who was trained using conventional tube monitors. They turn the brightness of the LCDs down to match the CRTs and position the LCDs in unrealistic positions, very often in sound booths.
SUGGESTION: An operator can only realistically look at 2 x 19" LCD racks in front of them. If more are needed, then position the outer ones at an angle, similar to that of a semi-circle.
Q: Why do I not have a 16/9 picture?
A: Are thes LCD screens 16/9?
NOTE: If they are 4/3 screens, a 16/9 picture will be displayed "squashed". 4/3 LCD screens do not display 16/9 pictures in letterbox format like CRT screens.
Q: Why do I have a faulty pixel or two?
A: Unfortunately no LCD manufacturer in the World can produce a pixel fault free screen 100% of the time.
PICTURE CONTROL
Q: I have a PAL/NTSC picture on the screen. Why is it really bright and why don't the picture control trimmers make much difference?
A: Ensure that the LCD input is 75ohm terminated.
NOTE: If the signal ends at the rack ie the loop through is not being used, then you terminate the unit by using a 75ohm BNC terminator on the output BNC socket of the OZRxxx0 monitors or the piano switch on the OZRxxx1 monitors.
Q: Why are the "Colour, Contrast and Tint" picture controls not working in SDI mode?
A: Only the brightness works in SDI mode as the LCD screen is displaying a high quality RGB component signal.
Q: I have a PAL picture on the screen. Why is the Tint picture control not working?
A: Tint only works for NTSC pictures.
SDI
Q: Why can't I display an SDI signal?
A: Ensure you have an SDI version (check the back for a handwritten part number OZRxxx2/3/4/9).
A: Ensure the push button switch at the back is "in" for an SDI signal.
Q: Why doesn't the SDI signal lock?
A: If the SDI is a 60Hz source (used in NTSC countries) then ensure the remote socket has been wired correctly or the piano switch is in the correct position.
A: Ensure you are are not trying to loop the SDI signal incorrectly.
Q: Why can't I loop the SDI signal.
A: The SDI feature has either not been activated (removing a jumper on the SDI card in the rack) or even installed.
NOTE: Call Teletest on SDI problems as it can be quite complicated to explain on paper!