LG 42LV375H Service Manual page 9

4. Check Commercial Features
4.1. External SPK Out and Volume control
4.1.1. Equipment & Condition
- Jig(Speaker out JIG, Speaker out control Jig) or Oscilloscope
- Power only mode
4.1.2. Check the speaker out & control
1) Connect the External Speaker : Check the sound.
2) Press the "+" key on the control Jig : Check the Max output.
3) Press the "-" key on the control Jig : Check the Min output.
Connect oscilloscope, you can see this waveform.
Button of Vol. control Waveform of Oscilloscope
UP(+)
DOWN(-)
4.2. IR Out and DC Power Outlet(5 V / 12 V)
4.2.1. Equipment & Condition
- Jig (commercial check JIG)
- Special 232C Cable for commercial check Jig
- Power only mode
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Only for training and service purposes
4.2.2. Check the power out & IR out - commercial
4.2.3. Check the power out & IR out - mini jig
4.3. Pro:Idiom
Recommended Input Signal
: RF, 1 KHz, Sine wave
4.4. Front LED Clock
- 9 -
check jig
1) Connect each other RS232C port on the Commercial Check
JIG.
2) Press RED Color key on Service remote control.
3) Check the LED of jig board.
- +12V / +5V LED (OK condition: Turn On)
- IR LED (OK condition: blinking)
1) Connect mini jig on RS232c port.
2) Press RED Color key on Service remote control.
3) Check the LED of mini jig.
1) Connect the RF Cable.
2) Turn to the Pro:Idiom channel (No. 333).
3) Check the video & sound.
** Only displayed at "POWER ONLY" mode
1) Check the LED Clock in Power only mode.
LGE Internal Use Only