Text preview for : TFC-04060_CTC211_Input_Video_Troubleshooting.pdf part of RCA D52130 Large File 6 pare RAR Folder containing: Flow Charts, Tech Tips, Trouble Shooting Manuals, Updates, Module Training, and Symptom Fixes
Back to : RCA_CTC210-211_01.rar | Home
THOMSON TECHNICAL COMMUNICATION
Television
Troubleshooting Flow Chart
TFC-04060
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: Input Video Troubleshooting SYMPTOM: No Input Video
1
1A
Place a video input signal on VID 1 jack J16502. Is the video signal present at pin 6 of U 1 6 5 0 1 ?
N o
Check the Jack J16502, coupling capacitor C16503, or diode CR16502. If these test good, check for open trace between C16502 and pin 6 of U16501.
Y e s
2
2A
Check for 9vdc at pin 9 of U16501. Check Data and Clock lines at pins 2 and 4 of U16501. If all these test ok, reinitialize the EEprom or suspect U16501.
Is there a video signal present at Pin 15 of U 1 6 5 0 1 ?
N o
Y e s Check the frame comb circuit at pin 6 and 8 of J16500. If these signals are missing, reinitalize the EEprom or suspect the frame comb board. If these signals are present, Check pins 17 and 18 of U16500. If these signals are missing, check VCC at pin 9 of U16500. If this tests OK, reinitialize the EEprom or suspect U 1 6 5 0 0
3
Is there a video signal present at Pins 3 and 5 U 1 8 1 0 0 ?
3A
N o
Y e s
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.
4
4A
Check for VCC (3.3vdc) at pins 6, 22, and 32 of U18100. Check the power on reset at pin 23 of U18100 (3.3vdc) . If these all test ok, reinitialize the eeprom or suspect U18100.
Are there video signals present at pins 39 (chroma) and 41 (Luma) of U18100?
No
Yes
5
5A
Check for a luma signal at pin 15 and chroma signal at pin 13 of U22300. If these signal is missing, check associated components off Pins 41 and 39 of U18100. If these components test good, reinitialize the EEprom or suspect U22300.
Are the luma/chroma signals present at pins 4, 5, and 6 of U22300?
No
Yes
6
6A
If any of these signals are missing, check the input pins 1, 3 and 13 of U22402. If OK, check the logic (9vdc) at pin 11 of U22402. If this voltage is missing, Check U38300 pin 16 (4.5vdc). If this voltage is low, reinitialize the eeprom. If this tests ok, suspect U22402.
Are the Y U V signals present at pins 4, 14, and 15 of U22402?
No
Yes
Go to page Three
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 Q22410, Q22409, and Q22411 and associated components.
Yes 8 9A
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
11A 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.