No Raster (2/ 2)

 

 

CHECK B+

 

 

Normal

At D829 cathode

Abnormal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the voltage at

each pinvolageof IC11

Check

 

Open

 

 

 

Fuse of AC line

 

 

 

 

 

 

 

 

 

 

 

 

 

OK

Check / Replace

 

 

 

NO

Check &

Replace

IC11

NO

Check &

Replace

Q402

NO

Check &

Replace

T401

NO

Check &

Replace

Q401

Check pin 60 Of IC11(H - Out)

Yes

Check Q402 Collector waveform

Yes

Check T401

& each pin voltage

Yes

Check Q401 Collector waveform

Yes

Check & Replace T402

Check the In/ out of regulator (IC821, IC822 IC823, IC824 IC825)

NO

OK

 

 

 

Fuse

 

 

 

 

 

NO

Check the Voltage

 

 

 

 

 

 

 

 

Of C803

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OK

 

 

Check / Replace

 

 

 

DB801

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

Check the Voltage

Pin 4 OF IC801

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OK

18~20V

Check / Replace

Fuse IC801

 

 

 

 

 

 

 

 

 

 

 

Check / Replace

IC801, IC802, IC826

Check Fuse and Diode of secondary Load of SMPS trans(T803)

Check / Replace

IC11

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Page 13
Image 13
LG Electronics RT-21FA35R/RX/V/VX service manual Check B+