Daewoo 103FH Service Manual download pdf (Page 18)

16

TROUBLESHOOTING HINTS

1. No Character

Are the

Contrast &

Brightness Controls

maximum?

Change the Contrast &

Brightness control value to

maximum

No Raster

Refer to

No Raster

Check the peripheral circuit

of CRT

Check the video output

circuit and IC803 (pin 4, 6, 14)

and their ambient circuit

Trouble in 12Vdc line

of the Main PWA

Check the clamping pulse

circuit

Check the signal cable

No Character

Is whole

screen bright?

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

Yes

Yes

Rk, Gk, Bk

About 45Vpp

No

No

Is CRT

Cathode (Rk, Gk, Bk)

signal level

normal?

Is the

output signal of the

pin 29, 32, 35 pre-amp

(IC802, M52742ASP)

normal?

Is clamping

pulse (pin 19 of IC802)

normal?

Is 12Vdc line

normal?

Is input signal

normal?

Trouble in IC802 and

its ambient circuit

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