Medion B1997PNST Service Manual page 22

MD 1998LE (B1997PNST)
5-3 Vertical Scan (Raster is one horizontal line)
Vertical Scan Abnormal
Check voltage of
pin 3 at I301
Replace I301.
No
(about 17.3 V)
Yes
Check
Check pin 12 & pin
pin 4 or pin 7 waveform
Abnormal 13 waveform at
at I301
I401
OK
Normal
Replace I301
Check R307 short ?
Yes
Still no vertical scan
Check or replace CRT Replace R307
Page 20 Troubleshooting