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84 HP High-Definition LCD TV Service Manual
LED Display abnormal
The front panel LED uses the following blinking patterns to indicate failures:
Indicator Blink Frequency Failure Part Location
Amber and aqua LED blinking 1 sec interval MCU-Host link error Main board
Amber LED blinking 1 sec interval TAFE does not respond Main board
Aqua LED blinking 1 sec interval Tuner does not respond Main board
Amber LED blinking 2 sec interval Digital Demodulator does not respond Main board
Aqua LED blinking 2 sec interval Audio process does not respond Main board
Amber and aqua LED blinking 2 sec interval More than two I2C devices error Main board
LCD Panel Troubleshooting Tips
Inverter board
Power board to panel inverter board (left, right)
Problem:
• No back light
• Screen flash
• If the board is shorted, no power
Action: Change inverter board
Control board (panel driver)
On top of the LCD panel
Problem:
• Wrong color
• Screen has big block on H or V (over 10 cm)
Action: Change panel
LVDS cable
Main board to LVDS cable to LCD panel connection
Problem: Line/display noise
Action: Change LVDS FPC cable or main board
Screen
LCD panel
Problem:
• Mura (cloudiness)
• Crack
Action: Change LCD panel