Sharp XG-C50X Service Manual download pdf (Page 42)

XG-C50X

TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)

Yes

Checking of GA4 and Its Periphery

Select R, G and B individually on

the pattern menu in the process

mode.

Is picture outputted appropriately

in R, G and B?

Checking of GA4 and its periphery

ends.

Measure the signals at pins (54),

(66) and (78) of SC8001 on the

oscilloscope. These signals are

MSB of B/G/R/.

Do the oscilloscope-measured

signals match with those selected

on the pattern menu?

The OUTPUT PWB is defective.

Does the clock signal come to pins

(40) and (42) of SC8001?

Is there the clock (37.5 MHz)

signal at TL8114?

IC8029 is defective.

Is there the clock (37.5 MHz)

signal at FL8110?

X8005 is defective.

IC8025 is defective.

Measure the signals at TL8106,

TL8107, TL8108, TL8110 and

TL8111 on the oscilloscope.

Do the oscilloscope-measured

signals match with those selected

on the pattern menu?

IC8025 is defective.

IC8029 is defective.

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Sharp XG-C50X Service Manual Page 42