DOWNLOAD LG 37LT760H (CHASSIS:LD2FF) Service Manual ↓ Size: 6.97 MB | Pages: 55 in PDF or view online for FREE

Model
37LT760H (CHASSIS:LD2FF)
Pages
55
Size
6.97 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
37lt760h-chassis-ld2ff.pdf
Date
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LG 37LT760H (CHASSIS:LD2FF) Service Manual ▷ View online

- 21 -
6. HDMI Video Trouble Shooting guide
Check input signal format.
Is it supported?
This board has big problem because Main chip (MTK) have some troubles.
After checking thoroughly all path once again, You should decide to replace MTK or not.
Check JK3301/JK3302/JK3303
Can you see the normal waveform?
Check HDCP key NVRAM(IC100)
Power & I2C signal
Check AC cable for damage
For damage or open conductor
Check the input of MTK(IC105).
Measure waveform at R323, R324 because it’s more easy to check.
Can you see the normal waveform?
Replace JK3301, JK3302, 
JK3303
Replace IC100.
N
N
Y
Y
Y
Y
Y
- 22 -
7. RGB-PC Video Trouble Shooting guide
Check input signal format.
Is it supported?
This board has big problem because Main chip (MTK) have some troubles.
After checking thoroughly all path once again, You should decide to replace MTK or not.
Check JK3603
Can you see the normal waveform?
Check AC cable for damage
For damage or open conductor.
Check the input of MTK(IC105).
Measure waveform at R323, R324 because it’s more easy to check.
Can you see the normal waveform?
Replace JK3603.
N
Y
Y
Y
Y
- 23 -
8. Analog RF Audio Trouble Shooting guide
Check RF cable & signal.
Check IC5400.
Check Audio AMP output L5402, 
L5403, L5404, L5405.
Replace IC105.
Check TU6500 Pin6.
(SIF output)
Replace Tuner.
Replace L5402, L5403, L5404, 
L5405.
Replace IC5400.
Check C352.
(SIF signal to IC105)
N
N
N
Y
Y
Y
Y
Y
- 24 -
9. AV / RGB-PC Audio in Trouble Shooting guide
Check input signal format.
Is it supported?
This board has big problem because Main chip (MTK) have some troubles.
After checking thoroughly all path once again, You should decide to replace MTK or not.
Check JK4600/JK3604
Can you see the normal waveform?
Check Audio AMP output L5402, 
L5403, L5404, L5405.
Check AC cable for damage
For damage or open conductor
Check the input of MTK(IC105).
Measure waveform at C610, C611, C319, C320 because it’s more easy to check.
Can you see the normal waveform?
Replace JK4600/JK3604.
Replace L5402, L5403, L5404, 
L5405.
N
N
Y
Y
Y
Y
Y
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