LG 32LT670H (CHASSIS:LA2AF) Service Manual ▷ View online
- 17 -
Analog RF Video Trouble Shooting guide
Check RF cable & signal
Y
Check TU3001 Pin7
(Video output)
Y
Check tuner 5V power L3000
Y
Check tuner 3.3V power L3001
Y
Check tuner 1.8V power IC3000
2pin : 1.8V
Y
Check Mstar LVDS output
Replace Tuner.
N
Check IC5000
Replace L3001
Replace IC3000
N
N
N
Replace IC101
N
Replace IC5000
N
Y
- 18 -
Digital RF Trouble Shooting guide
Check RF cable & signal
Check tuner 5V power L3000
Y
Check IIC Signal
TU3001 Pin#3,4
Y
Check DIF Signal
TU3001 Pin#10,11
Y
Check X201
and application circuit
Check IC5000
Replace TU3001
Replace TU3001
N
N
N
Replace IC101
N
Replace IC5000
N
Y
Replace X201
- 19 -
Composite Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK1700
Can you see the normal waveform?
Y
Check the input of Mstar(IC101).
Measure waveform at C217 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace JK1700
N
HDMI Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK800/JK801/JK802
Can you see the normal waveform?
Y
Check HDCP key NVRAM(IC103)
Power & I2C signal
Y
Check the input of Mstar(IC101).
Measure waveform at R4024, R4025 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace JK800, JK801, JK802
N
Replace IC103
N
- 20 -
RGB-PC Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check P900
Can you see the normal waveform?
Y
Check the input of Mstar(IC101).
Measure waveform at R4025, R4042 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace P900
N
Analog RF Audio Trouble Shooting guide
Check RF cable & signal
Check TU3001 Pin1
(SIF output)
Y
Check Audio AMP output
L503,L504,L505,L506
Y
Check IC501
Y
Check C250
(SIF signal to IC101)
Replace Tuner
N
Replace L503,L504,L505,L506
Replace IC501
N
N
Replace IC101
Y
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