Read LG 42LH55 (CHASSIS:LA92B) Service Manual online
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5. HDMI
Check input connect
JK500,JK501,JK502,JK503
Can you see the normal waveform?
JK500,JK501,JK502,JK503
Can you see the normal waveform?
Check DDC communication lines
(IC502)
(IC502)
JK500,JK501,JK502,JK503
may have problem. Replace this Jack.
Check the output of TDA9996HL(IC502)
_HDMI1,2,3
_HDMI1,2,3
or HDMI4.
.
Can you see the normal waveform?
After checking the Power of this chip, you should decide to replace this or not.
Check HDCP communication lines(IC105)
After checking the Power of this chip, you should decide to replace this or not.
YES
YES
YES
NO
NO
NO
NO
YES
YES
Check all power domain of LGE7329 (IC801)
(3.3V, 1.9V_CORE,1.26V)
(3.3V, 1.9V_CORE,1.26V)
& crystal output (X800 / 12MHz)&FRC_RESET
Measure Power & waveform at L800,L801,L802,L803,
L804,L806
because it’s more easy to check.
Can you see the normal waveform?
L804,L806
because it’s more easy to check.
Can you see the normal waveform?
This board has big problem because FRC chip(LGE7329) have some troubles.
After checking thoroughly all path once again, You should decide to replace
LGE7329.
Although you replace it, you cannot see normal display, decide to replace
After checking thoroughly all path once again, You should decide to replace
LGE7329.
Although you replace it, you cannot see normal display, decide to replace
Main chip(LGE3159)
This board has big problem because Main chip
(LGE3159) have some troubles.
(LGE3159) have some troubles.
After checking thoroughly all path once again,
You should decide to replace LGE3159 or not
Click on the first or last page to see other 42LH55 (CHASSIS:LA92B) service manuals if exist.