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THOMSON TECHNICAL COMMUNICATION
Television
Troubleshooting Flow Chart
TFC-04050
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: Horizontal Circuit Troubleshooting SYMPTOM: No Horizontal Deflection
Apply AC to the unit.
Warning!
To perform the troubleshooting in this flowchart, it will be necessary to defeat a safety circuit (scan loss). Make sure the CRT kine board (s) are disconnected before attempting this procedure. Remember to restore all connections or components to normal condition before returning to the customer.
Disconnect pin 18 of J14102 1 1A Press Power button and check pin 15 of J14102 for 12 vpp horizontal drive pulse. Check pins 12 & 14 for clock & data and pin 16 for 12 vdc. If present suspect the Deflection Sip Board
NO
Y E S 2 2A Check 12 volt sense Q14706 and xray protect Q14904
Is the drive pulsing
Y E S
NO
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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 3
THOMSON INC.
CTC211 No Horizontal troubleshooting (cont) 3 Check T14300 pin 1 for 12 vpp horizontal drive pulse 3A check path for an open trace
NO
YES 4 check T14300 pin 4 for 12 vpp horizontal drive pulse 4A
NO
open T14300
YES 5 5A
Is there 12 vpp horizontal drive at base of Q14451
NO
Check path for open trace or component
YES 6 6A
Check resistance from base to collector of Q14451 (14 to 15 K ohms) normal
NO
Q14451 defective or damaged
YES 7 7A check B+ (120vdc) and CR14452, C14453, T14451 Yoke
Is there 1000 vpp horizontal on the collector
NO
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 3
THOMSON INC.
CTC211 No Horizontal Troubleshooting
8 Check pin 7 of J14102 for 34 vpp feedback pulse
8A Check path from pin 8 of T14451 to pin 7 J14102
NO
YES
Horizontal is operational
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 3
THOMSON INC.