LG 26LT673H (CHASSIS:LA2AM) Service Manual ▷ View online
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13. LAN Main board Check
13.1. Overview
It is LNET RF modem & FTG card
13.2. Equipment
(1) b_LAN Checker: UTC-1000 (with Cable accessory)
(2) Computer(for test result monitoring)
(3) Connection JIG
13.3. Equipment connection map & b_LAN
Check
13.4. Check
13.4.1. Setting Procedure
13.4.1.1. Setting JIG
(1) Connect UTC-1000 Equipment to JIG device as a like left
picture
- Connection Line:
UTC-1000 TOP1<- ->Game port(RJ21)
-> TV-LINK CFG (Phone Jack)
UTC-1000 TOP2<- ->JIG 11pin Connection
UTC-1000 RF1<- ->b_LAN RF IN
UTC-1000 LAN<- ->PC LAN Port
13.4.1.2. Working procedure
(1) Connection
UTC-1000 LAN <- -> PC LAN Port
UTC-1000 TOP1 <- -> Game port(RJ21)
-> TV-LINK CFG (Phone Jack)
UTC-1000 RF1 <- -> b_LAN RF IN
(2) Power on JIG : Switch on front of the JIG
(3) Test Start
UTC-1000 TOP2 <- -> JIG 11pin Connection
(4) Checking b-LAN MAC Address
Check whether it is same their address numbers or not
between B-LAN Label and on the pc address numbers.
● Checking JIG contents
(1) Check whether displaying all “Pass” or not at the number
3.4.6.7.9 contents of UTC-1000 on the PC
(2) Check “Version 6.0” of the 1. b_LAN Application version
(3) Check whether it is same their address numbers or not
between B-LAN Label and
(4) MAC Address on the pc.
14. Serial number download
Connect Bar Code scan equipment and TV set by RS-232C
cable
(1) E2PROM Data Write
(2) E2PROM Data Read
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TROUBLESHOOTING
Power-Up Boot Fail Trouble Shooting guide
No OSD Trouble Shooting guide
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Check power connector and
RL_ON signal OK ?
Replace Power board
Y
N
Y
Check IC5002
RESET and UPDATE pin
Check switch SW501, SW502
Y
N
Check X5000 Clock
32.768KHz
Check X5000 application
circuit or Replace X5000
Y
N
Check IC5002 IIC
communication state
Check IIC line or replace
IC5002
N
Check IR input state of
IC5002 57pin
Check IR board
N
Y
Re-download PTC Micom
Y
Check LVDS Cable
Check LCD Module
Control board
Y
Replace Cable
N
Check P401 All
Voltage Level (5V, 12V, 24V)
Check power connector and
RL_ON(pin1) signal OK ?
Replace Power board
N
Y
Check Q409 output
Voltage(12V)
Y
Check Q409 application
circuit or replace Q409
N
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Analog RF Video Trouble Shooting guide
Check TU3001 Pin7(Video output)
Can you see the normal signal?
Check tuner 5V power L3000
YES
NO
Could you measure voltage of TU3001 & IIC lines?
Are they all normal?
Check Mstar LVDS output
NO
You should check power line
& IIC lines.
YES
You should replace TUNER.
NO
Check IC5000
YES
YES
Check tuner 3.3V power L3001
Replace L3001
NO
Replace IC5000
Replace L3000
YES
NO
Check tuner 1.2V power IC3000
2pin : 1.2V
Replace IC3000
NO
Check RF cable & signal
YES
NO
Replace
Mstar(IC101) or
main board
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Digital RF Trouble Shooting guide
Check RF Cable
Check IIC Signal
TU3001 #3, 4Pin
Check IIC line and level shifter
circuit
Y
N
Check Tuner 5V Power
L3000
Check L3000
Y
N
Y
Check X201
and application circuit
Check IF Signal
TU3001 #10, 11 Pin
Check tuner application circuit or
replace tuner.
N
Y
Replace X201
N
Y
Replace IC101
Replace IC5000
N
Y
Replace L3000
AV Video Trouble shooting guide
Check JK1700
Can you see the normal waveform?
N
JK1700 may have problem. Replace this Jack.
Check the input of Mstar(IC101).
Measure waveform at C217 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar)
have some troubles.
After checking thoroughly all path once again, You
should decide to replace Mstar or not.
Y
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
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