DOWNLOAD LG 42LS3400 / 42LS349C (CHASSIS:LJ21C) Service Manual ↓ Size: 5.19 MB | Pages: 42 in PDF or view online for FREE

Model
42LS3400 42LS349C (CHASSIS:LJ21C)
Pages
42
Size
5.19 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42ls3400-42ls349c-chassis-lj21c.pdf
Date
PREV: LG 42LS3400 / 42LS349C (CHASSIS:LA25C / LA21B) Service Manual

LG 42LS3400 / 42LS349C (CHASSIS:LJ21C) Service Manual ▷ View online

- 17 -
TROUBLE SHOOTING
No power
Check 24V, 12V, 3.5V 
of Power B/D
Check short of Main B/D 
or Change Power B/D
Pass
Check Output of 
Q403, IC407, IC401
Check P403 Connector 
Change LED Assy
: [A] PROCESS
Fail
Fail
Pass
Pass
Check LED Assy
Check short of 
IC402, IC403
Pass
Check short of 
Q403, IC407, IC401
Fail
Re-soldering or Change defect
part of Q403, IC407, IC401
Fail
Re-soldering or Change defect
part of Q403, IC407, IC401
Fail
- 18 -
No Raster
: [B] Process
Check LED status
On Display Unit
Repeat A PROCESS
Pass
Fail
Check Output of IC1401
Change IC1401
Fail
Change Inverter Connector
Or Inverter
Fail
Pass
Fail
Pass
Change LVDS Cable
Fail
Check LVDS Cable
Pass
Check Panel Link Cable 
Or Module
Change Panel Link Cable
Or Module
Check Inverter Connector
Or Inverter
Pass
- 19 -
No Raster on COMPONENT Signal
Check Input source 
Cable And Jack
Pass
Re-soldering or 
Change the defect part
Pass
Check the Input/Output
Of IC101
Fail
Re-soldering or 
Change the defect part
Repeat [A], & [B] Process
Check The Input/Output
Of JK1601, JK1602
Fail
Pass
No Raster on HDMI Signal
Check Input source 
Cable And Jack
Pass
Check the Input/Output
Of JK801, JK802, JK803
Fail
Re-soldering or 
Change the defect part
Pass
Pass
Check the Input/Output
Of IC103
Fail
Re-soldering or 
Change the defect part.
Re-download HDCP
Pass
Pass
Check the Input/Output
Of IC101
Fail
Re-soldering or 
Change the defect part
Repeat [A], & [B] Process
Pass
Check the Instart Menu
EDID D/L Status
Fail
Re-download EDID Data]
(Adjust Menu  EDID D/L)
Pass
- 20 -
No Raster On AV Video Signal
No Signal On TV(RF) Signal
Check Input source 
Cable And Jack
Pass
Check Input source 
Cable And Jack
Pass
Check The Input/Output
Of JK1601
Pass
Re-soldering or 
Change the defect part
Pass
Fail
Pass
Repeat [A], & [B] Process
Check the Input/Output
Of IC101
Fail
Re-soldering or 
Change the defect part
Pass
Check The Input/Output
Of TU3703
Pass
Re-soldering or 
Change the defect part
Pass
Fail
Check the Input/Output
Of IC101
Fail
Re-soldering or 
Change the defect part
Repeat [A], & [B] Process
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