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THOMSON TECHNICAL COMMUNICATION
Television
Troubleshooting Flow Chart
TFC-04058
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: Vertical Troubleshooting SYMPTOM: No Vertical
Warning!
To perform the troubleshooting in this flowchart, it may be necessary to defeat a safety circuit (scan loss). Make sure the CRT (s) are disconnected before attempting this procedure. Remember to restore all connections or components to normal condition before returning to the customer.
Place a short between base and emitter of Q14105. This will force on the run power supply when ac is supplied.
1
1A
Is the 12VDC run present at pin 16 of J14102?
N o
Check U14104 or troubleshoot the Run Power Supply.
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 3
THOMSON INC.
CTC211 Vertical Troubleshooting
2
2A
Using an oscilloscope, check for a 1.5Vpp sawtooth waveform at pins 2 and 4 of J14102. Are these signals present?
No
Suspect defective Horizontal SIP board.
Yes 3 3A
Are the 1.5Vpp sawtooth waveforms present at pins 1 and 7 of U14501?
No
Check associated components or cracked traces from J14102, pins 2 and 4. If these test ok, suspect shorted U14501.
Yes 4 4A
Is the 47VDC present at pin 3 of U14501?
No
Check R14523, Q14503, and C14503. If these test ok, troubleshoot the Run Power Supply.
Yes
5
5A Check CR14502 or series diodes CR14505, CR14509, CR14510, and CR14501. If these all test ok, troubleshoot the Run Power Supply.
Is the 12VDC present at Pins 2 and 6 of U14501?
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 Vertical Troubleshooting
6
6A
Is the -13VDC present at pin 4 of U14501?
No
Check Coil L14501, C14507, C14504, and C14506. If these test ok, check thermistor RT14502 or troubleshoot the Run Power Supply.
Yes 7 7A
Is the 55Vpp vertical drive waveform present at pin 5 of U14501?
No
Suspect U14501.
Yes
8
Check resistors R14511, R14508, and check connectors and wires going to the vertical yoke plugs. If these test ok, suspect open T24301 (Parallelogram board) or open vertical yoke.
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.