Zenith E44W46LCD, Service Manual

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ADJUSTMENT INSTRUCTIONS
(3) After pressing ADJ key on Remote Control for adjustment,
select the adjustment mode 5. 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 points)
O
H Coefficient(KHH, KHL)
--> Calculation method (CEHP-CSHP=1280, Horizontal
segment value =16)
9. KVH : Upper 2byte of vertical line correction coefficient --
Change according to CSVP, CEVP value.
10. KVL : Upper 2byte of vertical line correction coefficient --
Change according to CSVP, CEVP value.
O
V Coefficient(KVH, KVL)
--> Calculation method (CEVP-CSVP=720, Vertical segment
value =12)
11. RL1H : Upper 9bit of MID2 brightness correction coefficient in
R MIN.
--- Change according to RMIN and RMID2 value.
12. RL1L : Lower 9bit of MID2 brightness correction coefficient in
R MIN.
--- Change according to RMIN and RMID2 value.
13. RL2H : Upper 9bit of MID1 brightness correction coefficient in
R MID2.
--- Change according to RMID2 and RMID1 value.
14. RL2L : Lower 9bit of MID1 brightness correction coefficient in
R MID2.
--- Change according to RMID2 and RMID1 value.
15. RL3H : Upper 9bit of MAX brightness correction coefficient in
R MID1.
--- Change according to RMID1 and RMAX value.
(use it while adjusting 4 coefficient)
16. RL3L : Lower 9bit of MAX brightness correction coefficient in
R MID1.
--- Change according to RMID1 and RMAX value.
(use it while adjusting 4 coefficient)
<L Coefficient Calculation Method>
Using 3coefficient Level
Assume that the value of R/G/B MIN, MID2,MID1 is 192, 448,
704.
R/G/B MIN = 192
R/G/B MID2 = 448
R/G/B MID1 = 704
O
L Coefficient(RL1H~BL3L)
--> Calculation method (L1)
- calculate L2, L3 same with L1
17. GL1H : Upper 9bit of MID2 brightness correction coefficient in
G MIN.
--- Change according to GMIN and GMID2 value.
18. GL1L : Lower 9bit of MID2 brightness correction coefficient in
G MIN.
--- Change according to GMIN and GMID2 value.
19. GL2H : Upper 9bit of MID1 brightness correction coefficient in
G MID2.
--- Change according to GMID2 and GMID1 value.
20. GL2L : Lower 9bit of MID1 brightness correction coefficient in
G MID2.
--- Change according to GMID2 and GMID1 value.
21. GL3H : Upper 9bit of MAX brightness correction coefficient in
G MID1.
--- Change according to GMID1 and GMAX value.
(use it while adjusting 4 coefficient)
22. GL3L : Lower 9bit of MAX brightness correction coefficient in
G MID1.
--- Change according to GMID1 and GMAX value.
(use it while adjusting 4 coefficient)
23. BL1H : Upper 9bit of MID2 brightness correction coefficient in
B MIN.
--- Change according to BMIN and BMID2 value.
24. BL1L : Lower 9bit of MID2 brightness correction coefficient in
B MIN.
H coefficient = 1/(number of pixel intervals between setting in the horizontal
direction)
Hcoeff = 1/((1280/16)-1) = 0.012658227
hex(0.012658227 x 2 16 ) = 0 x 033D, Hcoeff(hex) = 0 x 033D + 1 = 0 X 33E
V coefficient = 1/(number of pixel intervals between setting in the horizontal
direction)
Vcoeff = 1/((720/12)-1) = 0.016949152
hex(0.016949152 x 2 16 ) = 0 x 0456, Vcoeff(hex) = 0 x 0456 + 1 = 0 X 0457
L1 coefficient = 1 / (brightness level(MID2) - brightness level(MIN)
L1coeff = 1 / (448-192) = 1 / 256 = 0.00390625
L1coeff(hex) = hex(0.00390625 x 2 18 ) = 0 x 0400
--> L1H(high 9bit) = b’000000010 L1L(low 9bit) = b’000000000
L2 coefficient = 1 / (brightness level(MID1) - brightness level(MID2)
L3 coefficient = 1 / (brightness level(MAX) - brightness level(MID1)
: case of 4 Brightness Level