LG 47LH90 Service Manual page 44

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LH40/LH55 Trouble shooting guide – Component

Check JK1206

Can you see the normal waveform?

YES

Check the input (Pin R1,R3,P2 and Pin V1,V2,U1)

of LGE3159(IC100).

Measure waveform at C101,C102,C103 and C115,C116,C117

because it's more easy to check.

Can you see the normal waveform?

YES

Check all power domain of LGE7329 (IC801)

(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?

YES

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

Main chip(LGE3159)

Only for training and service purposes

JK1206 may have problem. Replace this Jack.

This board has big problem because Main chip(LGE3159) have some troubles.

After checking thoroughly all path once again, You should decide to replace LGE3159 or not.

Video

LGE Internal Use Only

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