Showing posts with label lcd. Show all posts
Showing posts with label lcd. Show all posts
Monday, September 8, 2014
Difference between LCD and LED
Difference between LCD and LED :-
LCD is a liquid crystal display and LED is light emitting diode, both LCD and LED TVs or any other Lcds are Liquid crystal display.The basic technology in both of them is same as both type consist of two layers of polarized glass through which liquid crystal allows and blocks light, LED is basically a subset of LCD TVs.
LED Lcds differ from the LCDs in such a way that in LCD fluorescent lights are used while in LEDs light emitting diodes are used, another thing is placement of light on Lcd, fluorescent lights in LCD are always behind the Lcd while light emitting diodes on LEDs are placed either on behind or on corners of the Lcd thats the reason LEDs TV are slimmer than the LCD TVs.
LED TVs provide better and clear picture because of two reasons first LED TVs work with wheel or distint RGB- colors to produce share colors and second, Light emitting diodes can be dimmer which helps in maintaining the colors and sharpness on picture.
LCD is a liquid crystal display and LED is light emitting diode, both LCD and LED TVs or any other Lcds are Liquid crystal display.The basic technology in both of them is same as both type consist of two layers of polarized glass through which liquid crystal allows and blocks light, LED is basically a subset of LCD TVs.
LED Lcds differ from the LCDs in such a way that in LCD fluorescent lights are used while in LEDs light emitting diodes are used, another thing is placement of light on Lcd, fluorescent lights in LCD are always behind the Lcd while light emitting diodes on LEDs are placed either on behind or on corners of the Lcd thats the reason LEDs TV are slimmer than the LCD TVs.
LED TVs provide better and clear picture because of two reasons first LED TVs work with wheel or distint RGB- colors to produce share colors and second, Light emitting diodes can be dimmer which helps in maintaining the colors and sharpness on picture.
Thursday, September 4, 2014
TROUBLESHOOTING SANYO LCD 19R30 19 LCD TV
No raster_Sound normal, but no picture_ Picture normal, but no sound_Some source channel work abnormally.
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No raster (screen is not lit), no picture, no sound
If detect NS01 (main chip) pin 169 is of high level, you may remove RS14, detect VS01 emitter if first output high level after power on, then output low level continuously. If not, the reset schema may have problem. First detect if NS01 (main chip) pin 44 waveform is sine wave, if not, check NS01 crystal oscillator schema. When checking periphery of NS01, NS02 and NS05, check relative component’s welding, then use oscilloscope to detect the joint resistor pin between NS01 and NS05. If the waveform is not regular square-wave, that means either NS01 or NS05 work abnormally and therefore cause address line and data line be in error. NS05 error probability is greater. In addition, if joint resistor between NS01 and NS05 is in error, it will also cause no raster, no picture and no sound.
CLICK ON THE PICTURES TO ZOOM IN
Sound is normal, but no picture. (Blue screen and OSD can be displayed.) Note: HDMI channel is excluded.
Sound OK, but no picture (only backlight lights up)
Picture normal, but no sound.
Some source channel work abnormally.
Note: To get normal HDMI picture, especially when connect to DVD player with HDCP information, it must be guaranteed that NV04 and NV05 (HDMI port DDC chip) writing is correct, and especially bus between NV04, NV05 and HDMI jack must be smooth and unhindered. Secondly HOTPLUG schema must be guaranteed (it is of high level at normal broadcast), otherwise the picture playback cannot be normal.
To get normal HDMI sound, especially when connect to DVD player with HDCP information, it must be guaranteed that NV04 and NV05 (HDMI
port DDC chip) writing is correct, and bus between NV04, NV05 and HDMI jack must be smooth and unhindered, otherwise the sound playback cannot go.
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