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THOMSON TECHNICAL COMMUNICATION
Television

Troubleshooting Flow Chart

TFC-03120

The information contained herein is provided solely to assist qualified Technician in the diagnosis of the problem described. It is not intended as a modification or alteration of the product.
REVISION DATE: 12/29/2003 Chassis: SYMPTOM: ATC221 NO VIDEO TOPIC: NO VIDEO TROUBLESHOOTING

N ote: C onnector locations can be found under the C R IT IC A L LE A D D R E S S section in the service cd.

1. H ook up ant and tune set to active channel.

N ote: B V connectors are located on the convergence adaptor/ps board.

2.

Is voltage on B V 05 pin 1 0 vdc?

2A . YES

C heck the scan loss and abl circuits.

NO 3. Is there video at B V 05 pins 3,5,7 ? 3A .

NO

G o T o P age 4.

YES

C ontinue to page 2.

Product Safety Information
Product Safety information is contained in the appropriate Thomson Service Data covering models/chassis referenced herein. All specified Product Safety requirements and testing shall be complied with prior to returning equipment to the customer. Servicers who defeat safety features or fail to perform safety checks may be liable for any resulting damages and may expose themselves and others to possible injury.
First Edition First Printing Copyright 2003 Thomson multimedia Inc. Printed in U.S.A. Trademark(s) ® Registered Marca(s) Registrada(s)

Page 1 of 6

THOMSON INC.

Continue from page 1.

4. Note: Green BV04,BV07 Red BV02,BV06 Blue BV03,BV08 Disconnect connectors to crt boards one at a time.

5. Do the other tubes light up ? YES

5A. Suspect defective crt board.

NO

6. Is there a filament waveform on BV01 pin4 ? NO

6A. Check for filament waveform on pin 3 LL08.

YES

7. Is there 12vdc on BV07 pin 2 ? NO

7A. Check convergence power supply.

YES

Go To page 3.

Product Safety Information
Product Safety information is contained in the appropriate Thomson Service Data covering models/chassis referenced herein. All specified Product Safety requirements and testing shall be complied with prior to returning equipment to the customer. Servicers who defeat safety features or fail to perform safety checks may be liable for any resulting damages and may expose themselves and others to possible injury.
First Edition First Printing Copyright 2003 Thomson multimedia Inc. Printed in U.S.A. Trademark(s) ® Registered Marca(s) Registrada(s)

Page 2 of 6

THOMSON INC.

Continued from page 2.

8. Is there 239 vdc at BV01 pin 1 ?

8A Troubleshoot 239 vdc source.

NO

YES

9. Is the screen voltage on pin 10 crt socket correct ?

9A. NO Check focus screen assembly.

YES

10. Is there osd ? NO

10A. Suspect the SSB.

YES

11. Check the alignments.

Product Safety Information
Product Safety information is contained in the appropriate Thomson Service Data covering models/chassis referenced herein. All specified Product Safety requirements and testing shall be complied with prior to returning equipment to the customer. Servicers who defeat safety features or fail to perform safety checks may be liable for any resulting damages and may expose themselves and others to possible injury.
First Edition First Printing Copyright 2003 Thomson multimedia Inc. Printed in U.S.A. Trademark(s) ® Registered Marca(s) Registrada(s)

Page 3 of 6

THOMSON INC.

Continued from page 1 step 2.

12. Does unit have a frame comb circuit ?

12A.

NO

Suspect SSB

YES 13. Is there a video signal on BT400 pin 21 ? 13A.

NO

Suspect SSB

YES 14.

14A.

Is there luminance at BT400 pin 19 ?

NO

Suspect DRI board.

YES

15.

Suspect SSB.

Product Safety Information
Product Safety information is contained in the appropriate Thomson Service Data covering models/chassis referenced herein. All specified Product Safety requirements and testing shall be complied with prior to returning equipment to the customer. Servicers who defeat safety features or fail to perform safety checks may be liable for any resulting damages and may expose themselves and others to possible injury.
First Edition First Printing Copyright 2003 Thomson multimedia Inc. Printed in U.S.A. Trademark(s) ® Registered Marca(s) Registrada(s)

Page 4 of 6

THOMSON INC.