Installation modify stby circuit

Installation Gacun st-by LCD

Damage IC stand-by LCD can be replaced with Gacun commonly used in television tubes (3 wires) or disposable Gacuc IC STR (5 feet) How to install the TV tube Gacun 3 feet:

• Attach the red wire on tranfo switching.
• Attach the black wire to the ground great Elko.
• Attach the blue cable to the photocoupler. If the blue cable is not installed, then the output voltage will be more than 3.3 / 5v - although the position of VR has been minimal.
• Our experience Gacun do not need to be plugged cooling, because the power to st-by just a little.
• Noteworthy is Power Fet good isolated so as not to stick to the chassis / body LCD
• Special Note: If the current at power-on voltage 3.3 / 5V drops, then VR can diajust bit (voltage will not rise, remain 3.3 / 5v). If it still drops, then add a little ajustment try again .... and so on until it drops again.

 

How to install gacun IC STR 5 feet - see picture below:

What is the difference between TV Gacun 3kaki with Gacun ICSTR 5 feet?

• Gacun TV 3 feet can be mounted, although the technical components in the primary section there are partially damaged.
• Gacun IC can be mounted, with terms of 12 or 15V supply voltage on the primary part still function.

LCD main power supply

LCD Gacun main power supply (2 FET)

GACUN LLC power supply can be used on the LCD with PFC (B + 400v) or without PFC (+ 300v)
There are 2 kinds of gacun LLC, which

• Type for 32 "to 42".
• Type for 42 "and above.

Before installing GACUN LCD, it needs a bit of work pemahamn first LCD power supply.

• Large screen LCD power supply consist of 3 blocks of power supply circuits, namely 1) PFC circuits, 2) power supply st-by, and 3) Power supply Main.
• PFC circuit serves to raise the voltage to a voltage 300v 400v in Elko great. On the small screen LCD of this circuit does not exist.
• Power supply circuits PFC and current Top-st position by not working. And will work only if "Power-on".
• So when the st-by voltage at great elko only 300v. And when the "power-on" voltage berubag be 400v.

How to install :

• Remove the used components: 1) Power Fet, 2) IC driver, and 3) Photocoupler (X)
• Grease two power FET with silicon grease.
• Paste the second FET in a cooler, then attach the screws through the holes in the pcb.Do not be too strong because it can damage the components.
• Note: Do NOT IMPROVE LONG CABLE CONNECTORS.Because it can mengganngu employment systems.

How splicing cables GACUN LLC Power supply:

· Red	:	(+) Great Elko (2)
· Black	:	FET which repealed the former ground (0)
· Gray	:	tranfo resonant (8)
· Blue	:	tranfo resonant (6)
· Green	:	photocoupler footprints were repealed (5)
· White	:	Ic Vcc revoked driver coming from tranfo st-by (10 - 15V)
· Yellow	:	1) If using PFC or no voltage 400v does not need to be installed. 2) If no PFC or voltage is only 300v, attached to (+) Elko great along the red wire
· Purple	:	former photocoupler feet long (7)
· Chocolate	:	(-) Elko (1)

Panel Driver 3

Understanding the panel driver.3

TIMING CONTROL

Pictured above is an example of a circuit block driver panel. Timing and control is the heart of this circuit, which is responsible for:

• Controlling the timing (time) the mechanism of how the image data is received by turning on each pixel so as to form an image.
• Reset Row driver (gate driver) and Colom driver (data driver) for each time the start began to show images of the upper corner of the left and then perform scanning (sweeping) the image data line by line down seems like the TV tube on the entire surface until ceases at bottom-right corner of the screen.
• Row select line driver which should be turned on or off
• Colom driver inputs change digital image data into an analog voltage to regulate any pixel that needs dinyalakn and adjust the level of light-darkness of each pixel.

There are several kinds of input pulse signal from the mainboard via the LVDS cable to the control timings, mostly:

• Vertical Sync (Frame pulse) - used to reset Row Colom drivers and drivers so that every time began the formation of a "frame" image always starts from the top left corner of the screen.
• Horizontal sync (Line pulse) - used to reset so that the establishment of any "line" or "line" image always starts from the left edge of each scanning line locker
• Dot clock (pixel clock) - is used for the control refresh-rate as an indicator if the input data has changed.
• Enable or synchronization of data - as an indicator that the incoming data is valid
• RGB digital image data series
• Some types of panels may require additional input pulses, such as "invert" for alternating pictures and digital systems working options "VESA or JEIDA"

Note:

• The explanation above is just in general.
• Timing control circuit between a panel with other panels there may be differences, depending on the design and ic used
• Some are simple and some are complex

Panel Driver

Understanding the panel driver.2

Below are a few examples of block diagrams - Accidentally we give many examples here, so that each can complement each other's deficiencies in understanding the working panel driver.

Timing control

Timing -Control and panel driver.

On the tube TV technology, then that CRT can display images required:

• Def yoke: Requires pulses supplied horizontal deflection and vertical deflection pulse
• CRT: Requires Heater voltage, high voltage anode, Screen voltage and voltage Focus
• CRT module sockets: Requires image signal RGB, RGB Driver 180v voltage, and voltage 9v

 
This contrasts strongly with LCD technology, in which:

• So that the panel can display images required kinds and voltage control is more complicated.
• LCD panel discuss certainly can not be separated by T.con (timing control) as drivers of LCD glass panel whose content consists of hundreds of thousands of pieces of pixel.
• T.con is the key to how the image can be formed from the arrangement of the pixels on the glass panel
• On LCD models of the old - glass panels and T.con still separated, but thanks to technological advances in the manufacture of new models both have been made into a single unit.
• T.con needed to regulate the timing of "opening-closing" or "dark flame" each of pixels contained in the glass panel so as to form an image.
• T.con a regular partner with glass panels, so that the glass panels can not be installed or replaced by any T.con
• Each type of glass panel types of the different types require different driver circuits, as well as the characteristics of each driver is different, so studying the LCD panel driver becomes more tricky.

 
It should be understood that the glass panels or pixels can not be issued a "light" themselves. Each pixel of the glass panel can only be "open or close" so that the light from the backlight "can break out or blocked can not seep out".

• Pictured above is an example of how a pixel-drive in order to be life or death.
• Each pixel of each are driven by a FET is called TFT (Thin Film Transistor), which semauanya embedded within the glass panel.
• TFT are driven by pulses called GATE driver (or COLOUMN Data driver or driver) and driver SOURCE (or Row driver).
• GATE driver serves as an on-off switch that has a voltage with a variation of between approximately 0 to 10V
• SOURCE driver is the image data and has a voltage range between approximately 5V to + 20v (between Vof to Von)
• Output the bottom of the pixels are not directly connected keground, teapi associated with Vcom voltage magnitude exist in the midst between Voff and Von.

 
Broadly speaking driver panel blocks composed of sections called:

• Timing control.
• Grayscale plants (gamma).
• Voltage generator-drive.
• Generating all kinds of supply voltage.

EXAMPLE circuit T-con and its connection with LCD panel

EXAMPLE MODULE T-Con board old model

• Pictured above is a T-con board on LCD TV older model that still separated by a glass panel.
• T-con board there is usually located in the middle-top of the rear LCD panel, which is covered with a metal casing so it is not visible from the outside.
• Lower connector is connected to the digital module board or also called Mother-board using a special cable called LVDS cable
• The upper connector is connected using a "flat wire" through a glass panel to panel RSDS driver and RA

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Sample problems

RSample pictures of the damage the LCD PANEL

FORMULA DAMAGE LCD PANEL: If on the screen still looks "jigsaw" which still appeared normal, then certainly 99% of the panel is damaged, or there is the possibility of the connector between the T-con with less contact panel.

	The left part of the screen image still appears normal. Damage Source driver
	Damage Gate drive
	Damage Source drive Timing
	Damage gate drive timing
	Damage sebaaian Gate drive Timing
	Damage Gate drive Timing
	Damage Filter / LCD
	Damage Filter / LCD
	Damage to filter / LCD
	Damage paths surce driver
	Damage paths Gate driver
	Damage paths Gate driver
	Damage paths gate driver
	Damage pixel LCD
	Kebooran backlight, LCD pixel damage
	Crack
	Crack
	Could Panel, the T-con, LVDS, Mother-board
	Damage Gate drive
	Could Panel, the T-con connector with the panel, mother-board
	Could Panel or Mother-board
	Backlight

Sample pictures of the damage the LCD PANEL

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Sample pictures of the damage the LCD PANEL

FORMULA DAMAGE LCD PANEL: If on the screen still looks "jigsaw" which still appeared normal, then certainly 99% of the panel is damaged, or there is the possibility of the connector between the T-con with less contact panel.

	The left part of the screen image still appears normal. Damage Source driver
	Damage Gate drive
	Damage Source drive Timing
	Damage gate drive timing
	Damage sebaaian Gate drive Timing
	Damage Gate drive Timing
	Damage Filter / LCD
	Damage Filter / LCD
	Damage to filter / LCD
	Damage paths surce driver
	Damage paths Gate driver
	Damage paths Gate driver
	Damage paths gate driver
	Damage pixel LCD
	Kebooran backlight, LCD pixel damage
	Crack
	Crack
	Could Panel, the T-con, LVDS, Mother-board
	Damage Gate drive
	Could Panel, the T-con connector with the panel, mother-board
	Could Panel or Mother-board
	Backlight