Read LG 19LV2300 (CHASSIS:LA86D) Service Manual online
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A SMPTE Color bar signal is recommended for this
trouble shooting.
Check JK701, JK707
an you see the normal waveform?
Refer to figure 1
JK701,JK707 may have problem. Replace this Jack.
These points art applied connonly about all video input.
This board has big problem because Main chip(BCM3553) have some
troubles.
After checking thoroughly all path once again, You should decide to
replace BCM3553 or not.
Check the input (Pin AN17,AM19) of BCM3553(IC100).
Measure waveform at C651,C652 because it
’s more easy to
check.
Can you see the normal waveform?
This board has big problem because FRC chip(MT8280FG) have
some troubles.
After checking thoroughly all path once again, You should decide
to replace FRC-9459M.
Although you replace it, you cannot see normal display, decide to
replace Main chip(BCM3553)
Check all power domain of MT8280FG (IC1000)
(MT8280_CORE_1.0V,MT8280_DVDD33,MT8280_AV33,
AVDD12, AVDD12_SYSPLL,AVDD12_DMPLL,
AVDD12_MJCPLL,MT8280_DDRV) & crystal output (X1200 /
27MHz)&FRC_RESET Measure Power & waveform at C1224,
L1207, L1208, C2213, C1236,L1209~L1211&C1290&R410
because it
’s more easy to check.
Can you see the normal waveform?
AV-VIDEO
YES
YES
Figure 1
YES
NO
NO
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