LG 26LC45 / 26LC46 / 26LC4D (CHASSIS:LD73A) Service Manual ▷ View online
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3. Protect Mode
(1) Symptom
1) After lighting up once, it does not discharge
minutely from module.
2) The rely falls.(there is an audible “click”)
3) The color of the front LED turns from green to red.
3) The color of the front LED turns from green to red.
(2) Procedure check
Is the Power Board
normal ?
Replace the Power Board.
Is the output Low/High voltage normal
except for Stand-by 5V?
Yes
No
No
Is the each connector
normal?
Replace the connector.
Replace the
Y-Board.
After connecting each connector do
they operate normally?
Yes
No
Yes
Is the Ctrl Board
normal?
Replace the
X-Board.
Is the output voltage normal after
removing P1, 2, 4, 9, 10 connectors of
the Ctrl-B/D?
Yes
No
Yes
Is the Y-Board
normal?
Is the output voltage
normal after removing
P103 connector of
Y-B/D?
Is the appropriate Fuse(FS101,FS102)
on the Y-B/D normal?(Replace if open)
Yes
No
Yes
Yes
Replace the
Z-Board.
Is the Z-Board
normal?
Is the output voltage
normal after removing
P1 connector of
Z-B/D?
Is the appropriate Fuse (FS1, FS2) on
Z-B/D? (replace if open)
Yes
No
Yes
Is the X- Board
normal?
Is the output voltage normal after
removing P1, 2, 3, 4, 5 connectors of
the X-B/D?
If the output voltage is normal after removing
the P1, P2, P3 : Replace the right X-B/D
If the output voltage is normal after removing
the P4, P5 : Replace the left X-B/D
the P1, P2, P3 : Replace the right X-B/D
If the output voltage is normal after removing
the P4, P5 : Replace the left X-B/D
Yes
No
Yes
Is the
VSC Board normal?
Is the output voltage normal after
removing P900, P901 of VSC Board?
After a COF crisis for each board, check the normal operation. For normal operation,
corresponding COF failure means the module should be relaced.
corresponding COF failure means the module should be relaced.
If it operates normally after removing the
P900, P901 : Replace the VSC Board
P900, P901 : Replace the VSC Board
Yes
No
Is the COF of X, Y, Z
normal ?
No
Yes
Yes
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Does minute
discharge At Module?
Is the LVDC cable
normal?
Is the VAVS on?
Check the LCD Module
Yes
No
YES
Yes
Reconnect the LVDS
cable in P800
No
Is the IC700(FLI8548)
Output normal?
Replace the VSC.
No
NO
Replace the Power
board
Is the Low/High output
voltage normal except for
stand-by 5V?
NO
4. No Raster
(1) Symptom
1) No OSD and image occur at screen.
2) It maintains the condition where the front LED is green.
2) It maintains the condition where the front LED is green.
(2) Procedure check
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5. In case of strange screen display in specific modes
5-1. In case of no OSD display
(1) Symptom
1) LED is green.
2) The minute discharge is continuously accomplished from the module.
2) The minute discharge is continuously accomplished from the module.
(2) Procedure check
Is the LVDS cable
normal ?
Is the VSC Board
normal?
Is the LVDS cable
connected?
Re-insert the Cable.
Yes
No
No
Yes
Does the FIL8548
IC(IC700) operate?
Replace the FIL8548
IC(IC700)
No
Is the Ctrl Board of
Module normal?
Replace the Ctrl B/D.
No
No
Yes
Replace the VSC B/D
Replace the cable.
Yes
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5-2. In case there is no display on the screen in specific modes
(1) Symptom
1) There is no screen display from a specific input mode
(RF, AV, Component, RGB, DVI).
(2) Procedure check
1) Check the all input modes have normal display.
2) Check the video(main)/ data(sub), video(main)/ video(sub) have normal
2) Check the video(main)/ data(sub), video(main)/ video(sub) have normal
displays from the PIP mode or DW mode(re-check it/ swap).
(3) In case of an unusual display in RF mode
(4) In case of an unusual display in side S-video/ AV mode
Is the Tuner normal?
Is the CXA2069Q normal?
Is the Tuner Cable connected?
Re-insert the cable
Yes
No
No
Yes
Is the FIL8548 normal?
Replace the Tuner.
No
Are the Input voltage, IIC Communication
and CVBS output normal?
Yes
Are the Input voltage, IIC
Communication and HV sync normal?
No
Replace the IC.
No
Are the input voltage, IIC
Communication and HV sync normal?
No
Block A
Replace the IC.
No
Is the Video input of the
AV Jack(P1400) normal?
Yes
Is the CXA2069Q normal?
Check the input source
No
Are the Input voltage, IIC
Communication and HV sync normal?
No
Replace the IC.
No
Yes
Same as Block A
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