LG 50PT85-ZB (CHASSIS:PD74A) Service Manual ▷ View online
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Does minute discharge
At Module?
Is the LVDC cable
normal?
Is the VAVS on?
Check the PDP Module
Yes
No
YES
Yes
Reconnect the LVDS
cable in P1901
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.
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
(3) In case of an unusual display in RF mode
(4) In case of an unusual display in side S-video/ AV mode
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Are the R,G,B input and H,V
Sync of the P1100 normal?
Check the input source
No
Is the HDMI002(IC1004)
normal?
Yes
Same as Block A
Are Input voltage, IIC Communication
and HV sync normal?
No
Is the Video input of the
A/V Jack(J1200) normal?
Yes
Same as Block A
Check the input source
No
Replace the IC.
No
Is the Video input of the
A/V Jack(J1201) normal?
Yes
Same as Block A
Check the input source
No
Yes
Same as Block A
(5) In case of an unusual display in Component, RGB mode
(6) In case of an unusual display in HDMI mode
(7) In case of an unusual display in SCART1 mode
(8) In case of an unusual display in SCART2 mode
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