LG KG280 Service Manual - Page 71
Circuit, Checking Flow
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4. TROUBLE SHOOTING CIRCUIT CHECKING FLOW START LGE Internal Use Only VBAT KEY BACKLIGHT Is the level at R417 YES High? NO Are all LEDs Working? YES Backlight will work properly. R422 12K C421 27p R423 10 R424 10 65 4 KEY_BACKLIGHT R417 12K 10V Over ECCH0000182 C405 0.1u C406 0.1u C407 0.1u C408 0.1u C409 0.1u C410 0.1u SSC-TWH104-HLS LD400 R404 SSC-TWH104-HLS LD401 R405 SSC-TWH104-HLS LD402 R406 SSC-TWH104-HLS LD403 R407 SSC-TWH104-HLS LD404 R408 SSC-TWH104-HLS LD405 R409 100ohm 100ohm 100ohm 100ohm 100ohm 100ohm NO - 72 - Q400 IMX9T110 Check U101 Check the soldering each R and LED NO Replace or resoldering component VBAT Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes 12 3 C419 27p R419 10 R420 10 SSC-TWH104-HLS LD406 R410 SSC-TWH104-HLS LD407 R411 100ohm 100ohm SSC-TWH104-HLS LD408 R412 100ohm SSC-TWH104-HLS LD409 R413 100ohm SSC-TWH104-HLS LD410 R414 100ohm SSC-TWH104-HLS LD411 R415 100ohm EDLH0012501 C411 0.1u C412 0.1u C413 0.1u C414 0.1u C415 0.1u C416 0.1u
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