Read LG 19LV2300 (CHASSIS:LA86D) Service Manual online
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A SMPTE Color bar signal is recommended for this
trouble shooting.
Check JK700,JK702.
Can you see the normal waveform? Refer to figure 1
JK700,JK702 may have problem.
Replace this Jack.
These points art applied connonly about all video input.
Check the input (Pin AL21,AM21,AN21 and PinAN22, AL22, P22)
of BCM3553(IC100).
Measure waveform at C638,C639,C640 and C628, C629, C630
because it
’s more easy to check.
Can you see the normal waveform?
Component-VIDEO
YES
YES
Figure 1
YES
NO
NO
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?
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.
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)
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