Read LG 19LV2300 (CHASSIS:LA86D) Service Manual online
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A SMPTE Color bar signal is recommended for this
trouble shooting.
Check DDC communication lines
(IC601, IC602,IC603, IC701)_5&6 PIN must be 5V
To be able to check the waveforms of HDMI input,
it requires a high speed & bandwidth oscilloscope
Check input connect JK600,JK601,JK602,JK708
Probe at Clk positive and nagative points.
This Clk speed can be up to 225Mhz, depending on
what kind of source comes in.
Can you see the normal waveform? Refer to figure 1
Replace
JK600,JK601,JK602,JK708
Replace the defective IC
Check the output of PI3HDMI341ATR(IC600)
_PIN 25/26/28/29/31/32/34/35,TMDS141RHAR(IC703)
_PIN 9/10/12/13/15/16/18/19
You can easily check pin 34/35PIN of IC600
(TMDS CLK OUTPUT),18/19PIN of IC703
Can you see the normal waveform? Refer to figure 2
HDMI-Video
YES
YES
Check HDCP communication lines(IC102)_5&6 PIN
must be 5V
YES
Figure 1
NO
NO
Replace IC102
Replace IC600 for HDMI 1/2/3
Replace IC703 for HDMI4
NO
NO
Figure 2
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