LG 42LG61YD (CHASSIS:LB81C) Service Manual ▷ View online
5.4. Adjustment Commands(LENGTH=84)
5.5. EEPROM DATA READ
(1) Signal TABLE
(2) Command Set
* Purpose : To read(84h) the appointment Address of
E2PROM by 128(80h)-byte
5.6. E
2
PROM Data Write
(1) Signal TABLE
LEN : 84h+Bytes
CMD : 8Eh
ADH : E
CMD : 8Eh
ADH : E
2
PROM Slave Address(A0,A2,A4,A6,A8), Not 00h
(Reserved by Buffer To EEPROM)
ADL : E
2
PROM Sub Address(00~FF)
Data : Write data
(2) Command Set
* Purpose
1) EDID write : 16-byte by 16-byte, 8 order (128-byte)
write(TO “00 – 7F” of “EEPROM Page A4”).
2) FOS Default write : 16-mode data (HFh, HFl, VF, STD,
HP, VP, Clk, ClkPh, PhFine) write
3) Random Data write : write the appointment Address of
E
2
PROM.
5.7. VRAM Read
- Send CMD(70h) to read Video RAM value from MICOM And
save its value to 128-Bytes Buffer(Common Buffer for the
use of EDID)
use of EDID)
- Delay 500ms (Time to Wait and Read Video RAM from
MICOM)
- Be transmitted the contents of MICOM’s 128-bytes Buffer to
PC. (128th Data is the CheckSum of 127-bytes data : That’s
OK if the value of adding 128-bytes Data is Zero)
- 17 -
Adjustment Contents CMD(hex)
ADR
VAL[HEX]
Description
FACTORY ON
E0
00
00
Factory mode on
FACTORY OFF
E2
00
00
Factory mode off
EEPROM ALL INIT.
E4
00
00
EEPROM All clear
EEPROM Read
E7
00
00
EEPROM Read
EEPROM Write
E8
00
data
EEPROM Write by
some values
COLOR SAVE
EB
00
00
Color Save
(R/G/B cutoff, Drive,
Contrast, Bright)
H POSITION
20
00
00 – 64
They have different
V POSITION
30
00
00 – 64
range each mode,
CLOCK
90
00
00 – 64
FOS Adjustment
PHASE
92
00
00 – 64
R DRIVE
16
00:cool
00 – 80
Drive adjustment
01:medium
02:warm
G DRIVE
18
00 :cool
00 – 80
01:medium
02:warm
B DRIVE
1A
00:cool
00 – 80
01:medium
02:warm
R CUTOFF
80
00
00 – 7F
Offset adjustment
G CUTOFF
82
00
00 – 7F
B CUTOFF
84
00
00 – 7F
BRIGHT
10
00
00 – 3F
Bright adjustment
CONTRAST
12
00
00 - 64
Luminance adjustment
AUTO_COLOR_
F1
00
02
Auto COLOR
ADJUST
Adjustment
CHANGE_COLOR_
F2
00
0,1,2,3
0: Cool
TEMP
1: Medium
2: Warm
3: User
White Pattern
F3
00
00,FF
00: White pattern off
FF: White pattern on
AUTO_
F4
00
0,10,20,30, 0 : TV
INPUTCHANGE
40,60,90
10 : DTV
20 : SCART1
30 : SCART2
40 : Component
60 : RGB
90 : HDMI
128 Bytes
Delay 100ms
EEPROM READ
E7
A0
0
0-Page 0~7F Read
80
0-Page 80~FF Read
A2
0
1-Page 0~7F Read
80
1-Page 80~FF Read
A4
0
2-Page 0~7F Read
80
2-Page 80~FF Read
A6
0
3-Page 0~7F Read
80
3-Page 80~FF Read
Adjustment item
CMD(hex) ADH(hex) ADL(hex)
Details
EEPROM WRITE
E8
94
16-Byte Write
84+n
n-byte Write
Adjustment item
CMD(hex)
LEN
Remark
70
00
00
6F
A
A
Data 1
START
Data 128
STOP
NA
CS
...
- 18 -
1. TV/CATV doesn’t display
2. DTV doesn’t display
TROUBLESHOOTING
Check T U401 Pin 15(Vid eo ou tp ut),
Pin1 6(Sound output)
Can you see t he normal sign al?
Check th e output of TR(Q503).
Can you see t he normal wavefo rm?
Check th e output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and c loc k.
Can you see t he normal wavefo rm?
YES
YES
NO
Could you measu re voltag e of TU800 & IIC
lines?
Are they all normal?
YES
NO
You sh ou ld ch eck p ower lin e
& IIC li nes.
YES
You sh ou ld rep lace TUNER.
NO
You sh ou ld decid e to rep lace TR(Q503) or not.
NO
After ch eckin g th e Power of Main IC(IC100) you
should decide to replace Main IC or not .
This bo ard has b ig problem becau se Main
IC(IC100) have some troubles.
Afte r c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace Main Bo ard or no t.
Check th e outp ut data o f TU800 Pin 24~34
Can you see t he normal sign al?
NO
Could you measu re voltag e of TU800 & IIC
lines?
Are they all normal?
NO
You sh ou ld ch eck p ower lin e
& IIC li nes.
YES
You sh ou ld rep lace TUNER.
YES
Check th e output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and c loc k.
Can you see t he normal wavefo rm?
YES
NO
After ch eckin g th e Power of Main IC(IC100) you
should decide to replace Main IC or not .
This bo ard has b ig problem becau se Main
IC(IC100) have some troubles.
Afte r c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace Main Bo ard or no t.
- 19 -
3. AV 1/2/3 doesn’t display
Check J6 00,J600,JK 607,JK618
Can you see t he normal wavefo rm?
Check th e in pu t o f Vid eo switch (IC700).
Can you see t he normal wavefo rm?
YES
NO
J600,J 601 or SIDE AV may have problem.
Replace th is Jack o r SIDE AV.
NO
After ch eckin g th e Power of AV switch you
should decide to replace AV switch or not.
Check th e output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and c loc k.
Can you see t he normal wavefo rm?
YES
NO
After ch eckin g th e Power of Main IC(IC100) you
should decide to replace Main IC or not .
This bo ard has b ig problem becau se Main
IC(IC100) have some troubles.
Afte r c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace Main Bo ard or no t.
YES
4. Component doesn’t display
Check J7 01.
Can you see t he normal wavefo rm?
Check th e in pu t o f Compo nent Audio
switch (IC1001) ,
Can you see t he normal wavefo rm?
Check th e output of Comp on ent Audio
switch (IC1001) ,
Can you see t he normal wavefo rm?
YES
YES
YES
NO
J701
may have problem. Rep lace th is Jack.
NO
Afte r c hecking the Power of compone nt Audio
switch, y ou should decide to replace component
Audio s witch or not.
NO
Afte r c hecking the Power of compone nt Audio
switch y ou should decide to replace component
Audio s witch or not.
Check th e output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and c loc k.
Can you see t he normal wavefo rm?
YES
NO
After ch eckin g th e Power of Main IC(IC100) you
should decide to replace Main IC or not .
This bo ard has b ig problem becau se Main
IC(IC100) have some troubles.
Afte r c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace Main Bo ard or no t.
- 20 -
5. RGB PC doesn’t display
Check J7 03 ,
Can you see t he normal wavefo rm?
Check th e in pu t o f RGB Audio
switch (IC1001) ,
Can you see t he normal wavefo rm?
Check th e output of RGB Audio
switch (IC1001) ,
Can you see t he normal wavefo rm?
YES
YES
YES
NO
J703
may have problem. Rep lace th is Jack.
NO
After ch eckin g th e Power of RGB Audio sw itc h,
you should decide to replace RGB Audio s witch
or not.
NO
After ch eckin g th e Power of RGB Audio sw itc h
you should decide to replace RGB Audio s witch
or not.
Check th e output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and c loc k.
Can you see t he normal wavefo rm?
YES
NO
After ch eckin g th e Power of Main IC(IC100) you
should decide to replace Main IC or not .
This bo ard has b ig problem becau se Main
IC(IC100) have some troubles.
Afte r c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace Main Bo ard or no t.
Check th e in pu t o f RGB Video
switch (IC700) ,
Can you see t he normal wavefo rm?
NO
After ch eckin g th e Power of RGB Vid eo switc h,
you should decide to replace RGB Video switch
or not.
YES
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