Medion B1997PNST Manuel de service télécharger pdf (Page 23)

Page 21

Troubleshooting

MD 1998LE (B1997PNST)

5-4 R.G.B. Video Amplifier Abnormal

Check B+

(pin17, pin36)

Yes

Check

the waveform at the I501

pin 29, pin 32, pin 35

Check

the waveform at the

I901 pin 3, 5, 1

RGB Video AMP Abnormal

Yes

No

Yes

No

Check B

+

pin 10, 6

Video signal present at the

pin of the CRT R.G.B.

Cathode

Defective cut-off circuit

(DC restore)

Yes

Check the

waveform at pin

2, 6, 11, 19, 27

Check I501

Yes

Yes

Check I901

1 2 ... 18 19 20 21 22 23 24 25 26 27

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