Read LG 19LV2300 (CHASSIS:LA86D) Service Manual online
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A SMPTE Color bar signal is recommended for this
trouble shooting.
Check Luminance & Chroma signals at JK701
Can you see the normal waveform? Refer to figure 1
Replace JK701
These points art applied connonly about all video input.
Check the input (Pin AL16,AL17) of BCM355x(IC100).
Measure waveform at C651,C652 because it
’s easier to check.
Can you see the normal waveform?
S_Video-VIDEO
YES
YES
Figure 1
YES
NO
NO
Replace IC100
YES
Check all power domain of MT8280FG (IC1000)
(MT8280_CORE_1.0V,MT8280_DVDD33,MT8280_AV33,AVDD
12,AVDD12_SYSPLL,AVDD12_DMPLL,AVDD12_MJCPLL,MT8
280_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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