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5 Troubleshooting
5-2 No Video [Analog]
Check signal cable and connection. Does the digital video signal appear at the Pin 26,27,28,29,31,32,33,34,36,37,38,39, 41,42,44,45,46,47,49, and 50 of IC302? Yes The output of Pin 1 and 19 of IC500 is High? No Check IC500 and related circuit. No Does the input signal appear at Pin of 11, 22, 64, 65, and 66 of IC302?(DCLK, LVDS-EN, DHS, DVS, DEN)
2 3 4 5 6
1
Yes
Check TFT-LCD panel and Inverter.
Yes Replace IC302.
No Does the analog video signal appear at R126,R127 and R128? (RED, GREEN, BLUE) Yes Does the Sync. signal appear at the output of Pin 30 and 31 of IC 500 ? (MCU_VSYNC, MCU_HSYNC)
7 8
No
Check PC Signal.
No Check IC101 and related circuit.
Yes Does the input signal appear at the Pin 40 and 41 of IC 201? 9 10 (PLL H*V, COAST) Yes During power on-off, does the input signal appear at the Pin29 and 30 of IC201? (AD-SDA_B, AD-SCL_B) Yes Do the clock and Sync. signal appear at Pin115 and 117 of IC 201 (ACLK 11 , AHS_Z4 12 ) and does the digital video signal appear at the output port RA200~RA211? Yes During power on-off dose the input signal appear at the R546 and R547? (Z4_SDA_A, Z4_SCL_A) No Check IC500 and related circuit. No Check IC201 and related circuit. No Check IC500 and related circuit. No Check the related circuit for these ports.
5-2
CN17A*/B* CN18A*
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