Medion B1997PNST Manuel de service télécharger pdf (Page 22)

Page 20 Troubleshooting

MD 1998LE (B1997PNST)

5-3 Vertical Scan (Raster is one horizontal line)

Replace I301.

Check pin 12 & pin

13 waveform at

I401

Yes

Check voltage of

pin 3 at I301

(about 17.3 V)

Check

pin 4 or pin 7 waveform

at I301

Vertical Scan Abnormal

Abnormal

Normal

No

OK

Replace I301

Check R307 short ?

Still no vertical scan

Check or replace CRT

Yes

Replace R307

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