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THOMSON TECHNICAL COMMUNICATION
Television
Troubleshooting Flow Chart
TFC-04057
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: Chassis: CTC211 9/23/2004
TOPIC: Tuner Signal Troubleshooting SYMPTOM: No Tuner Video
1
1A
Is tuner video present at pin 1 or video input present at pins 5, 6 or 8 of U16501 (depending upon input selected)?
No
Check U32603 (tuner video) at pin 21 for video signal. If tuner video is missing, check the tuner and associated components. If the video inputs are missing, check the jack inputs at J16501, J16502, and J16503.
Yes
2
2A Suspect U16501,compressed Data/Clock lines at pins 2 and 4 of U16501. If all these test good, reinitialize U13102 or suspect U16501.
Tuner or input video will be output from pin 15 of U16501. Is this signal present?
No
Yes
Go 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 4
THOMSON INC.
3
3A
Is the Main CV (video signal) present at pin 51 of U18100?
No
Check Q18100, Q18101, C18106, and other associated components in the FPIP video input circuitry.
Yes 4 4A Check the 3.3vdc supply, Data/ Clock lines at pins 27 and 28, comb pass circuit between pins 49 and 43 (luma) and pins 47 and 45 (chroma) of U18100, and the sync pin 24. If these are present, reinitialize U13102. If this fail to restore video, suspect U18100
Is the Luma signal output at pin 41 or Chroma signal at pin 39 of U18100?
No
Yes
5
5A
Is the Luma signal present at pin 4 and the Chroma signals (U - V) at pins 14 and 15 of U22402?
No
Check Luma signal at pins 4 and the chroma signals at pins 5 and 6 (U - V) of U22300. If these are missing, suspect U22300. If the signals are present, check the switching logic (high) at pins 9, 10, and 11 of U22402. If all these test OK, reinitialize U13102 or suspect a defective U22402.
Yes 6 6A
Are the Luma/chroma signals present at pins 1 (1H-V), 2 (1H -Y), and 3 (1H- U) of U22401?
No
Check Q22404, Q22403, or Q22405 and associated components.
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 4
THOMSON INC.
7
7A
Are the Luma/chroma signals present at pins 1 (1H-V), 3 (1H -Y), and 5 (1H- U) of J32201 on the scan rate converter board?
No
Check Q22404, Q22403, and Q22405 and associated components.
Yes 8 8A
Are the YPrPb signals present at pins 12 (2H Y), 10 (2H -Pr), and 8 (2H- Pb) on J32501 on the scan rate converter board?
No
Suspect a defective Scan Rate Converter board.
Yes 9 9A Check U22404, U22405, and U22406. Check for correct switching at pin 9 on U38200 (high for internal signal). If these test ok, suspect U38200.
Are the 2H YPrPb (YUV) signals present at pins 14 (Y), 15 (U), and 13 (V) on U38200 (i-o board)?
No
Yes
10
10A Check for correct switching at pins 10 on U22401 (low for internal signal). I f the switching is correct, suspect U22401.
Are the YUV signals present at pins 14 (Y), 15 (U), and 13 (V) on U22401
No
Yes
Go to Page 4
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 4
THOMSON INC.
11
11A Check the Luma-Chroma output signals at pins 13, 14, and 15 of U22401. If these are missing, check the switching (low) at pins 9, 10, and 11 of U22401. If this voltage is correct , suspect U22401.
Are the Luma and Chroma signals present at pins 51 (sel 2H-v), 52 (sel 2H-u), and 53 (sel 2H-y) of U22300?
No
Yes 12 12A
Are the Drive signal outputs present at pins 41, 42, and 43 of U22300?
No
Check the FSW at pin 36 of U22300, the "sense in" at pin 56 (should be 2.6vdc), and the "ABL" circuit at pin 45 (4.5-6.0vdc). If all these test ok, reinitialize U13102 or suspect a defective U22300.
Yes
13 Check for output drive signals at pin 12 of U25101 (red), U25301 (green), and U25501 (blue). If these test ok, check the filament circuit (R14701, U14752). Also check for correct screen voltage (190vdc - 420vdc)
End
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 4
THOMSON INC.