Read LG 32LT75 / 32LT76 (CHASSIS:LD74A) Service Manual online
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2. 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.
After connecting each connector do
they operate normally?
No
Yes
Yes
Is the VSC
Board normal?
Is the output voltage normal after
removing P900, P901 of VSC Board?
If it operates normally after removing the
P900, P901 : Replace the VSC Board
P900, P901 : Replace the VSC Board
No
Yes
Does minute
discharge at Module?
Is the LVDC cable
normal?
Is the inverter on?
Check the LCD Module
Yes
No
YES
Yes
Reconnect the LVDS
cable in P1901
No
Is the IC700(FLI8548)
Output normal?
Replace the VSC.
No
Replace VSC board.
Is it ok?
Is it ok?
YES
YES
No
Is the Low/High output voltage
normal except for stand-by 5V?
No
Replace the Power
board
Is the voltage (P900 5pin
on VSC) 0V or Low?
No
3. 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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