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Feed the DVI digital signal to 
INPUT3.

Select the INPUT3 input.

Is the image free of distortion?

Are the colors as specified?

Does image appear onscreen?

No problem with the DVI 
digital input.

Is the sync signal as specified?

Is the clock as specified?

IC298 (Sil151) or its 
peripherals defective.

IC298 (Sil151) or its 
peripherals defective.

IC298 (Sil151) or its 
peripherals defective.

Note:
In order to establish the plug & play fashion, first connect the cable 
to INPUT3 and then turn on the computer power (signal generator).

»

Measure the C463 land for the vertical sync
signal and the C464 land for the horizontal sync
signal (on the back the PC board).

»

Measure the R685 value for the clock (on the
back of the PC board).

With the plug & play fashion 
established, feed the DVI 
analog signal to INPUT3.

Select the INPUT3 input.

Does image appear onscreen?

DVI connector or its 
peripherals defective.

CVIC_IC or IC4 peripherals 
defective.

IC302 or its peripherals 
defective.

Check the DVI_SOG circuit.

Sync separation circuit IC330 
or IC331 (TL712CPW) or its 
peripherals defective.

Are there R, G and B signals?
(Check to see if the R, G and B 
signals are coming to pins 
(126), (136) and (141) of IC4.)

Is the image free of distortion?

Is the sync signal of separate 
type?

Are there horizontal and 
vertical sync signals at TL130 
and TL131?

Is the sync signal as specified?
(Check pin (6) of IC330 for the 
vertical sync signal and pin (6) 
of IC331 for the horizontal sync 
signal.)

Is there horizontal sync signal 
at TL82?

Is there Green signal at pin 
(135) of IC4?

IC4 or IIC bus control 
peripherals defective.

Is there sync signal at TL136?

IC23 or IC336 defective.

Are pins (4) of IC23 and IC336 
at low level?

DVI connector or its 
peripherals defective.

CPU port defective.

No problem with the DVI_SOG.

»

The SOG component of the DVI analog signal is separated
in the CXA3516R circuit. The Green signal is fed to the 
SOGIN2 terminal. The DVI SOG sync signal is selected 
by the bus switch (IC23).

Is there horizontal sync signal 
at TL82?

Is there Green signal at pin 
(135) of IC4?

IC4 or IIC bus control 
peripherals defective.

Is there sync signal at TL136?

IC23 or IC336 defective.

Are pins (4) of IC23 and IC336 
at low level?

DVI connector or its 
peripherals defective.

CPU port defective.

No problem with the DVI_SOG.

»

The SOG component of the DVI analog signal is separated
in the CXA3516R circuit. The Green signal is fed to the 
SOGIN2 terminal. The DVI SOG sync signal is selected 
by the bus switch (IC23).