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EN 15
3139 785 30981
5.
Upgrade Software & Repair Chart
5.2.5 Audio No Sound (TV & External Source)
Part 1
Part 2
Pin 9
Pin 10
Source
0 0 Tuner
0 1
Rear
In
1
(reserved)
1 0
FRONT
AV-in
1 1
Rear
In
2
(CVBS, YC)
Check I316 & I319 = sine wave
&
Check I606 & I607= sine wave
Check I310 & I311
Verify against Truth Table
Check Test Point
SYSCLK I608 = square pulse 12.28MHz
F609, F610, F611 = square Pulse
Replace the component in between these 2
test point (Op Amp 7300)
Check control line
I612 = 0V (low)
I611 = 1.7 V
I610 = 1.6V
Check MSP (7500) Xtal at I509 = 18.432MHz
Check Supply voltage at
I513 = 8V
I508 = 5V
I515 = 5V
Check I2C At
I500 & I501
IF MDX pin 3 & 13 = no sine wave
Verify Input of MDX 7301
I312, I313, I314, I315
Check supply voltage
I614
OK
No
OK
OK
OK
No
I503 = 4.5MHz 300~500mVpp Sine wave
Touch up joint
OR
Replace IC MSP (7500)
OK
OK
Truth Table