Medion B1997PNST Manuel de service télécharger pdf (Page 20)

Page 18 Troubleshooting

MD 1998LE (B1997PNST)

5 Troubleshooting

5-1 No Raster

Measure

H voltage of B+

at T402 on

PWB-MAIN

No Raster

Check voltage

of cathode,

heater, Grid

1, Grid 2, etc.

Check

I401, ZD401,

Q416, Q424

Check

D801

Check

I802, R894, R867, Q802,

D820, D819, D822, D826,

D824, D827,D831,

ZD802, ZD803

Yes

Short Circuit

at load?

Check DC B+

line, F801

Yes

Check AC I/P on

T805

No

No

T101 pin 2 HV

B+

Yes

Video

High

(50 V or more)

0 V

Yes

0 VHIGH

48 V

Normal

(40 V, 31.5 kHz)

I103, I102

Q103, Q104,

R8A3, I103

Check

I401, Q424,

Q416, D409

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 26 27

Commentaires sur ces manuels

Pas de commentaire