Daewoo 103FH Service Manual download pdf (Page 26)

24

7-1. Dynamic Focus

Focus is poor

Is the

waveform of the

DF pin in

HVG (pin 1)

correct?

HITACHI : 450V 180V

SAMSUNG : 370V 180V

1. Check the CRT socket

or connector wire.

2. Trouble in

HVG

or CRT.

1. Check the 12V DC line.

2. Check Q607, Q602,

Q603, Q605 and Q604.

3. Check the waveform of

pin 13 in IC501.

4. Check the DZ610, DZ611.

FVH

FVH FVV

FVV

No

Yes

Yes

Is the

waveform of

the pin 13 in IC501

correct?

Yes

Is the

collector voltage

of the Q605

about 650V?

1. Check the waveform of

the pin 1 of HVG.

2. Check D620, D619.

No

Yes

No

Trouble in D604, D605.

Trouble in IC501.

No

2.0V

1V

0V

0.8V

Is the

base voltage

waveform of the

Q605 correct?

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