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THOMSON TECHNICAL COMMUNICATION
Television
Troubleshooting Flow Chart
TFC-04059
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: VGA Video Troubleshooting SYMPTOM: No VGA Video
1
1A Check connectorr J38200 and Inputs on pins 6, 7, or 8 of U38200. Check switching at pins 9, 10, and 11 of U38200 (high for VGA) . If all these test OK, Try reinitializing the EEprom or suspect U38200.
Are the YUV signals present at pins 13, 14, and 15 of U38200?
N o
Y e s
2 Are the YUV signals present at pins 14 (Y), 15 (U), and 13 (V) on U22401
2A Check for correct switching at pins 10 on U22401 (low for internal signal). I f the switching is correct, suspect U22401.
N o
Y e s
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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 2
THOMSON INC.
3
3A 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 4 4A
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
5 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 2 of 2
THOMSON INC.