Monday 6 June 2016

How to adjust the screen of LG LCD projection TV

(1) All adjustment mode are entered by pressing the INSTART key on the remote control, after adjustment press the IN-START key to come out.
(2) Compomation of adjustment mode: The first screen composition of pressing IN-START key.
(3) Select menu to adjust(turn to yellow) with using (CH+), (CH-)) key above screen and press the enter key to adjust on the wanting menu.
(4) After being inputed for SUB menu, select the SUB menu with using (CH+),(CH-) key and adjust the value of adjustment with using the volume +,volume -  key.
(5) Press the IN-START key to come out after adjustment, when the screen is appeared, press again to come out the final adjustment mode.
LCD Adjustment - NRS Adjustment
[ When the LCD panel load data on regular pixel using high speed charge/discharge with sample & holder, the drain width of TFT gradually decreases and the non-resistance increases, and comes out regular noise on screen(shows
vertical line by 12 pixel)  This NRS signal is enforced charge/discharge signal so that the ON/OFF time of TFT mode quickly before starting active video signal, H/L level adjustment is possible to each R, G, B.
(1) Required Test Equipment
1) PC Pattern Generator : 16 Step Gray Pattern
2) Fixation Stand
3) Remote Control for Adjustment
4) Circuit thing Jig for Adjustment (Except Driver Board Assy)
(2) Equipment Composition
(3) Preparation for Adjustment
1) Connect PC Pattern Generator with adjustment Jig (Except Drive part of a circuit block)
2) Select a PC Pattern Generator, 16 Gray.
(4) Adjustment Sequence
1) Turn on a adjustment Jig.
2) Select a RGB_PC by pressing Input Select button on Remote Control.
3) Enter to adjustment mode by pressing IN-START button on Remote Control.
4) Select 4. 62352, then ready to adjust 6. RNRSH, 9. GNRSH and 11. BNRSH.
5) Let’s decrease vertical line Noise by using Volume button.
(Input a R, G, B input signal, then adjust it individually)
6) When finishing the adjustment, get out of adjustment mode by pressing IN-START button.
VCOM Adjustment
(1) Required Test Equipments
1) PC PATTERN GENERATOR : Pattern Generator which can generate each R,G,B signal and can observe the FLICKER best.
2) (Fig. 2) Equipment composition
3) Remote Control
4) Circuit thing Jig for Adjustment (Except Driver Board Assy of adjustment model)
(3) Preparation for Adjustment
1) Connect the PC Pattern Generator with circuit thing for adjustment(circuit block except driver part) and adjustment Jig. shown upper Fig
2) Set the PC Pattern generator with displayable format(DTV720p, SVGA 60Hz, XGA 60Hz) and turn on it.
(4) Adjustment Sequence
1) Turn on the adjustment Jig.
2) Select a RGB_PC by pressing Input Select Key on Remote Control.
3) Enter to adjustment mode by pressing IN-START button on Remote Control.
4) Select 4. 62352, then ready to adjust 4. 62352 RVCOM, 7. 62352 GVCOM and 10. 62352 BVCOM.
5) Let’s decrease flicker by using Volume button.
(Input a R, G, B input signal, then adjust it individually)
6) When finishing the adjustment, get out of adjustment mode by pressing IN-START button on Remote Control.
Assembling Adjustment
5-1. Screen Tilt & Keystone Adjustment
(1) Required Test Equipments
1) Six angles wrench and spanner for knob adjustment or fixation
2) XGA output PC
3) Remote Control
(2) Preparation for Adjustment
1) Do not assemble the front panel equipment so that you can adjust the adjustment knob.
2) Turn the TV ON and select input mode to RGB_PC.
3) Connect XGA output terminal to PC input of TV.
4) Select window screen.
(3) Adjustment Sequence
1) Stick the Engine(Fig. 3) to the knob poll for adjustment and
check the key stone & tilt watching TV screen.
2) Rotate left/right adjustment knob below and adjust engine angle.
3) Adjustment adjustment knob of both sides so that the tilt and keystone are to be under the spec. (The gap between max and min : under 4mm)
4) After adjusting like 3), fix the engine with screw for fixation (2EA. adjustment knob and engine fixing screw).
Screen Position Adjustment
(1) Required Test Equipment
A remote control for adjustment
(2) Preparation for Adjustment
1) Connect a power source with TV Set and turn TV Set on.
2) Do heat run for 15 min and over before adjustment.
3) Receive the main/sub signal of company through 13CH by split screen.
(3) Horizontal Position Adjustment
1) Press In-START key on the remote control to enter the adjustment mode.
2) Select 3. RGB Alignment.
3) Select 10. H_position with channel key in adjust mode.
4) Adjust data with using the left/right key on the remote control in order to be left/right symmetry screen. (Three blocks of the most outer block must be located the most outer block.)
Adjustment for Vertical Position
1) Select 16. V_position with channel key in adjust mode.
2) Change the data to summarized upper and down of screen and then press the IN-START button on Remote Control to get out of adjustment mode.
Adjustment of White Balance and Gamma
(1) Required Test Equipments
1) Illuminometer (name of model : CA-100) 1EA > Measure color of projecting screen center [ CA-110(name of model) is possible to measure White Balance and Gamma - leave it 20Cm from screen center
Follow a measurement machine manual to set CA-100 and CA-110 measurement machine.
2) Pattern Generator 1EA —> 16 step Gray Pattern, 64 step Gray Pattern
3) Set Fixation Stand 1EA
4) Remote Control 1EA
5) Circuit thing Jig for adjustment(Except Drive Board Assy of adjustment model)
Programmed Digital Board so that the VDP Test Pattern can output white signal by 1 level form 0 to 255 level.
Preparation for Adjustment
Compose the equipment follow Fig. 2 and place the set on the fixation stand.
1) Select the VDP Test Pattern signal to R1, G1, B1.
2) Press the IN-START key to select 4. 62352 and then select
5. RVREF, 8. GVREF, 12. BVREF in adjust mode.
3) Adjust the luminance of CA100 below 0.75Cd. (The adjustment range is 196~202)
4) Exit adjustment mode by pressing IN-START button on Remote Control.
5) Press the IN-START key on R/C and select 3. 7050 RGB Set.
6) Check the data 1. RContrast, 8. GContrast, 15. BContrast is 515. Otherwise set the data 515 by using volume button.
Adjustment Sequence
1) Output the 255,255,255 signal of VDP Test Pattern, then display the maximum white pattern on screen.
2) Gamma Adjust Mode is display as below when select 5.  Gamma adjust by selecting IN-START key on R/C
3) Change the 16 Step RGB Data to select white balance x=283, y=297(D9300K).
4) Measure the luminace with changed data.
5) Set the every Gamma data of 16 step to 2.2 on the basis of measured luminance data in 3).  (Max luminance *(n1/16)**2.2) — Max luminance : measured luminance data n1 = every step unit when separating signal level to 16 step)
6) Output the 240, 240, 240(15th data in max white output signal level) in the VDP Test Pattern, change the 15th RGB Data value to come out white balance x=283, y=297(D9300K) and measured step luminance in 5).
7) Output the 224, 224, 224(14th data in max white output signal level) in the VDP Test Pattern, change the 14th RGB Data value to come out white balance x=283, y=297(D9300K) and measured step luminance in 5).
8) Output the VDP Test Pattern signal(208/192/176/160/144/128/112/96/80/64/48/32/16) and change the RGB Data value of each step to come out white balance x=283, y=297(D9300K) and measured luminance in 3).
Gamma adjustment manually
This is adjustment (after finish the 3-4) to check whether Gamma/White Balance adjustment are well adjusted and make correction manually.
1) Prepare the PC Pattern Generator which is possible to output R/G/B of 16 step and 64 step Gray Pattern.
2) Equipment composition: Follow Fig. 2.
3) Turn on the Jig for adjustment.
4) Select the RGB_PC by pressing the input select button on Remote Control.
5) Output the 16 Gray Pattern in PC Pattern Generator.  Check it with the naked eye whether Screen Gamma and W/B is right about each Gray.  If it’s not, press the IN-START button on Remote Control and then adjust the level data of each step manually in sub menu of 5. Gamma adjust.
6) Output the 64 Gray Pattern in PC Pattern Generator.  Check it with the naked eye whether Screen Gamma and W/B is right about each Gray or whether there is Gamma noise.  If there’s any problem, adjust in 5).
7) After finishing adjustment, exit adjustment mode by using IN-START button on Remote Control.
White Uniformity Adjustment
(1) Required Test Equipment
1) Uniformity measurement equipment : Equipment which can measure chromaticity in the whole screen
2) Set Stand 1EA
3) Remote Control for Adjustment
4) Circuit thing Jig for Adjustment(Except Driver Board Assy of adjustment model)
Programmed Digital Board so that the VDP Test Pattern can output white signal by 1 level form 0 to 255 level.
Preparation for Adjustment
1) Composite the equipment as shown Fig 2, and place the set on fixation stand.
2) After inputting company channel 13, adjust color uniformity like Horizontal/Vertical position adjustment of input signal part adjustment by using Remote Control for adjustment.
3) After pressing IN-START key on Remote Control for adjustment, select the adjustment mode 6. Uniformity adj.
Refer to register value and correct register value if need.
<Resister Explanation about uniformity adjustment>
1. RamCtrl : s/w saving uniformity write order(Do not adjust)
2. CSHP : Horizontal start point designation ---adjustable
3. CSVP : Vertical start point designation ---adjustable
4. CEHP : Horizontal END point designation ---adjustable
5. CEVP : Vertical END point designation ---adjustable.
6. Mode : uniformity mode select --- adjustable if need
*** 0 : 221point & 3level ---- default value
*** 1 : 221point & 4level
*** 2 : 825point & 3level
*** 3 : 825point & 4level
7. KHH : Upper 2byte of horizontal line correction coefficient - - Change according to CSHP, CEHP value.
8. KHL : Upper 2byte of vertical line correction coefficient -- Change according to CSHP, CEHP value.
** How to calculate KHH, KHL value
LCD panel size = 1280 x 720
Correction Point = 221 point
> 17 horizontal points x 13 vertical points
(16 horizontal segments x 12 vertical poins)
 H Coefficient(KHH, KHL)
> Calculation method (CEHP-CSHP=1280, Horizontal segment value =16)

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