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CTV990101 TELEVISION TECHNICAL BULLETIN
Month of Issue: January 1999 Classification: White Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM While in the RGB mode, sync may be lost when the channel up or down buttons are pressed. CAUSE ACTION Corruption of the EPROM data. Change the EPROM, using the part number given below.
REF NO IC1004 IC1004
DESCRIPTION EPROM, 66DW18H EPROM, 76DW18H
PART NUMBER CH-IX1642CJH0 CH-IX1642CJH1
PRICE CODE AZ AX
Sharp Electronics (UK) Limited Approval Date / / Reference GE84601X Revision 1 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units Originator AvW Supervisor
CTV990104 TELEVISION TECHNICAL BULLETIN
Month of Issue: January 1999 Classification: White Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM While in the NTSC mode, colour or sync may be lost.
CAUSE ACTION
Corruption of the EPROM data. Change the EPROM, using the part number given below.
REF NO IC1004 IC1004
DESCRIPTION EPROM, 66DW18H EPROM, 76DW18H
PART NUMBER CH-IX1642CJH0 CH-IX1642CJH1
PRICE CODE AZ AX
Sharp Electronics (UK) Limited Approval Date / / Reference GE84300X Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units Originator AvW Supervisor
CTV990105 TELEVISION TECHNICAL BULLETIN
Month of Issue: January 1999 Classification: White Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM Poor teletext performance.
CAUSE ACTION
Poor video signal level into the teletext decoder and errors in the EPROM data. Carry out the following circuit change. 1. Change R447 (connected to pin 9 of IC401) with a 0R jumper. 2. Change the EPROM (IC1004) with the one listed below.
REF NO IC1004 IC1004 R447
DESCRIPTION EPROM, 66DW18H EPROM, 76DW18H SMD resistor, 0R
PART NUMBER CH-IX1642CJH0 CH-IX1642CJH1 VRS-TV1JD000J
PRICE CODE AZ AX AA
Sharp Electronics (UK) Limited Approval Date / / Reference SP84300X Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units Originator AvW Supervisor
CTV990106 TELEVISION TECHNICAL BULLETIN
Month of Issue: January 1999 Classification: White Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM In the RGB mode, the picture is displaced to the right.
CAUSE ACTION
Error in the EEPROM data. While in the service mode, change the data in the following location. NVM Page : NVM Address : Data : 08 5C 45 (was 36)
Sharp Electronics (UK) Limited Approval Date / / Reference GE84600X Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units Originator AvW Supervisor
CTV990707 TELEVISION TECHNICAL BULLETIN
Month of Issue: July 1999 Classification: White Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM No picture - blank raster. CAUSE ACTION R1810, R1811 and R1812 changing in value. Replace R1810, R1811 and R1812.
REF NO R1810 R1811 R1812
DESCRIPTION Resistor 33k, 1/8W Resistor 33k, 1/8W Resistor 33k. 1/8W
PART NUMBER VRD-RA2BE333J VRD-RA2BE333J VRD-RA2BE333J
PRICE CODE AB AB AB
Location of R1810, R1811 and R1812 on the CRT PWB
Sharp Electronics (UK) Limited
Reference AM270799 Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
CTV991004 TELEVISION TECHNICAL BULLETIN
Month of Issue: October 1999 Classification: White Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM The reciever does not turn on - mains fuse blown.
CAUSE ACTION
Bridge rectifier diodes short circuit (D701, D702, D703 and D704). Replace D701, D702, D703 and D704 with the part specified below.
REF NO D701 D702 D703 D704
DESCRIPTION Diode, RM4ALF-L1 Diode, RM4ALF-L1 Diode, RM4ALF-L1 Diode, RM4ALF-L1
PART NUMBER RH-DX0317BMZZ RH-DX0317BMZZ RH-DX0317BMZZ RH-DX0317BMZZ
PRICE CODE AD AD AD AD
D703
New
Old
D701
D704 D702
Sharp Electronics (UK) Limited
Reference UK93000X Revision 1 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
CTV991202 TELEVISION TECHNICAL BULLETIN
Month of Issue: December 1999 Classification: White Page 1 of 1
MODELS
66DW18H
76DW18H
76EF19H
76EF20H
SYMPTOM The following problems can occur on the 100Hz PWB. · · ·
·
Intermittent digital noise on the picture Intermittent mosaic squares on the picture Mosaic effect if the 100Hz PWB is tapped Red, green or blue screen if the 100Hz PWB is tapped
CAUSE
Problems around the field mixer IC, SDA9270. · · IC6108 in the 66DW18H and 76DW18H IC6105 in the 76EF19H and 76EF20H
ACTION
Carry out the following counter measures. 1. Make sure that there are no dry joints on the Mother PWB 2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove IC6108/IC6105 Note that you can operate the 100Hz PWB with the shield cans removed. It is important that these are returned to there original condition when the job is completed.
Sharp Electronics (UK) Limited
Reference JR031299-1 Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
CTV2000 01 03 TELEVISION TECHNICAL BULLETIN
Month of Issue: January 2000 Classification: White Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM The circuit diagram in the service manual for the line output transformer is incorrect.
ACTION
Correct the circuit diagram so that pin 8 reads pin 10 and pin 10 reads pin 8.
Sharp Electronics (UK) Limited
Reference AM140100-1 Revision 1 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
Power Supply (Main)
T701 Bridge Rectifier F702 15 R705 R749 C705 R702 R704 C728 Standby D718 D721 R720 C707 R707 R708 17 4 C730 D731 18 3 R718 D706 C726 R710 D707 C6V8 R709 8V D730 D729 Q701 D705 C718 20 6 7 11 10 D710 9 5 D708 C711 D709 12.5V C712 C720 F703 -19V 140V D719 C719 19V
6v
olt
s
Ze
ro
D720 R706
C708
Q702
Q703
C710 R717 IC701 C709 R714 Q712 Q705 R723 R719 R716
R715 D717 C6V2
Slave Processor
D6704 L HT R6703 N D6703 R6707 R6706 IC6701 Reset D6701 C5V1 C6703 R6704 D6705 R6705 5V
Reset R6708 C6704 6 8
M1000 R/C
R6709
4
1
R6710 IC6703 7
IC6702 Slave Processor (Volitile) 2 3 13 IC6704 15 Key pad Standby
Line Output
140V +8V D619 D620 R602 R641 R606 D630 R605 L609 R601 Line Drive Q603 R603 Q602 R634 Q604 D610 R607 East/West Circuit +40V D632 R619 C604 D608 Q601 C601 C633 D601 F601 +13V -13V 5 D607 F602 R611 6 1 HPROT D613 Scan Coils 3 10 9 4 C632 C610 8 D603 +200V L606 R604 D609 R648 T601 EHT
2 7 13
DF1 Focus 2 Focus 1 Screen
ABL
D605
C603
-19V
CTV991003
East West Correction
LOPT pin6 R651 C631 D628 40V D625 C12 L604 C606 L602 R610 140V Scan Coils D601 13V D612 D616 D626 C12 13V Diode Modulator L605 R624 C619 D618 R566 D617 Q605 R538 R567 + IC501A R537 T602 DF1 C635 C626 C521 13V D510 C509 D508 R546 200V C623 R642 D623 R643 R644 R646 D624 Q608 R647 + IC503A D509 C2V7 Q501 Line pulses R502 Q607 R639 R627 ABL LOPT 140V
C607
R541
C630
R645
R545 East/ West Drive
Vertical Output
R531 R563 R518 Q510 R533 Q511 +13V Q509 R508 R505 D504 C513 D518 Q504 R503 +140V C504 R503 Q501 Horizontal Drive C501 C502 R501 Vertical Drive (B) D510 C509 D508 D509 C2V7 C519 R510 +5V R524 R513 IC502 Vertical Drive (A) -13V C532 C512 R523 C503 R534 Q505 R512 R549 D519 IC501 + -13V R526 C507 C508 D521 C7V5 D501 C7V5 D502 C7V5 D522 C7V5 Q508 D507 C508 D512 C534 L501 VPROT C514 R532 Scan Coils Q507 R515 C515 R547 D511 D513 Q512 +40V R530
D505 D503
R565
R511
C533
R522
100Hz Block Diagram
Flowcharts
CW100 Chassis
Flowcharts
Chart 3 Blank Rastor
Chart 1
Re-Flow Solder Around The Re-Flow Solder Around The Followng Components Followng Components IC6002 IC6002 IC6101 IC6101 IC6108 IC6108 IC6109 IC6109
Select an RGB Select an RGB source source
Check Teletext and OSD
Yes
Picture
No
Yes
On Or Flashing
No
Yes
Power Supply Starts
Power supply is working correctly Power supply is working correctly check data communication check data communication
Reconnect Plug CB Reconnect Plug CB
No
Remove R648 Remove R648 Press button CH+
Power supply Power supply and micro processor and micro processor working correctly working correctly Check for line drive Check for line drive
Yes
Power Supply Starts
line Output Fault line chart Fault gotoOutput2 goto chart 2
Power Supply Starts For A Few Seconds Only
140v
Check HT on D708 Cathode
Zero
Has F601, F602, D626, D625 failed
Q601 Short Circuit
Power supply Power supply was operating was operating in standby mode in standby mode
Dead
Check Protection circuit Check Protection circuit IC1001 pin 78 IC1001 pin 5v = Normal 78 5v = Normal 0V= switch to standby 0V= switch to standby
Chart 2
Check for Short circuit on a Check for Short circuit HT supply other than the main on a supply other than the main HT
Check T601 and Check T601 assocated and assocated components components
Power supply is Power supply being held in is being held standby modein standby mode check IC6702 check IC6702
Check Check R704* R704* R705* R705* Q701 Q701 Q702 Q702 Q703 Q703 D718 D718 * fit 1 watt resistors * fit 1 watt resistors
No
Yes
Check Check D608 D608 D612 D612 D503 D503 D513 D513 Q512 Q512 Q509 Q509 Q508 Q508 Q507 Q507
Check Check D603 D603 D609 D609 D610 D610 C604 C604 +19v +19v
Yes
Less Than 40v
Check Scancoils,T601 and T602 for poor soldering
No
No
Re-solder Re-solder and test and test
'IF' fault 'IF' fault or or IC6001 IC6001
Remove Plug CB Remove Plug CB
No
NICAM and OPC LED's Luminated
Yes
Ensure that the aerial Ensure that the aerial is not connected is not connected
NICAM and OPC LED's Luminated
Yes
F6701 and plug fuse failed, Check F6701 and plug fuse failed, Check Bridge rectifier (Tech bulletin CTV991004) Bridge rectifier (Tech bulletin CTV991004) Q701 Q701 Q702 Q702 Q703 Q703 D718 D718
Select an AV Select an AV source source
Yes
Check Check R1810 R1810 R1811 R1811 R1812 R1812 IC6111 IC6111
IC6001 IC6001
No
Neon LP6701 Luminated
Check Check IC6002 IC6002 IC6101 IC6101 IC6108 IC6108 IC6109 IC6109
Picture
No
No
Dead
No
Yes
Picture
Sharp Electronics (UK) Ltd
02/02/2000
Sharp Electronics (UK) Ltd
CW100 Chassis
02/02/2000
CTV990101 TELEVISION TECHNICAL BULLETIN
Month of Issue: January 1999 Classification: White Page 1 of 1
CTV991202 TELEVISION TECHNICAL BULLETIN
MODELS 66DW18H 76DW18H Month of Issue: December 1999 Classification: White Page 1 of 1
MODELS
66DW18H
76DW18H
76EF19H
76EF20H
SYMPTOM The following problems can occur on the 100Hz PWB. SYMPTOM While in the RGB mode, sync may be lost when the channel up or down buttons are pressed. CAUSE ACTION Corruption of the EPROM data. Change the EPROM, using the part number given below. DESCRIPTION EPROM, 66DW18H EPROM, 76DW18H PART NUMBER CH-IX1642CJH0 CH-IX1642CJH1 PRICE CODE AZ AX · · ·
·
Intermittent digital noise on the picture Intermittent mosaic squares on the picture Mosaic effect if the 100Hz PWB is tapped Red, green or blue screen if the 100Hz PWB is tapped
CAUSE
Problems around the field mixer IC, SDA9270. · · IC6108 in the 66DW18H and 76DW18H IC6105 in the 76EF19H and 76EF20H
REF NO IC1004 IC1004
ACTION
Carry out the following counter measures. 1. Make sure that there are no dry joints on the Mother PWB 2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove IC6108/IC6105 Note that you can operate the 100Hz PWB with the shield cans removed. It is important that these are returned to there original condition when the job is completed.
Sharp Electronics (UK) Limited
Sharp Electronics (UK) Limited Originator AvW Supervisor Approval Date / / Reference GE84601X Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
Reference JR031299-1 Revision 2
White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
CTV990104 TELEVISION TECHNICAL BULLETIN
Month of Issue: January 1999 Classification: White Page 1 of 1
CTV990105 TELEVISION TECHNICAL BULLETIN
Month of Issue: January 1999 Classification: White Page 1 of 1
MODELS
66DW18H
76DW18H
MODELS
66DW18H
76DW18H
SYMPTOM While in the NTSC mode, colour or sync may be lost.
SYMPTOM Poor teletext performance.
CAUSE ACTION
Corruption of the EPROM data. Change the EPROM, using the part number given below.
CAUSE ACTION
Poor video signal level into the teletext decoder and errors in the EPROM data. Carry out the following circuit change. 1. Change R447 (connected to pin 9 of IC401) with a 0R jumper. 2. Change the EPROM (IC1004) with the one listed below.
REF NO IC1004 IC1004
DESCRIPTION EPROM, 66DW18H EPROM, 76DW18H
PART NUMBER CH-IX1642CJH0 CH-IX1642CJH1
PRICE CODE AZ AX
REF NO IC1004 IC1004 R447
DESCRIPTION EPROM, 66DW18H EPROM, 76DW18H SMD resistor, 0R
PART NUMBER CH-IX1642CJH0 CH-IX1642CJH1 VRS-TV1JD000J
PRICE CODE AZ AX AA
Sharp Electronics (UK) Limited Approval Date / / Reference GE84300X Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units Originator AvW Supervisor
Sharp Electronics (UK) Limited Approval Date / / Reference SP84300X Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units Originator AvW Supervisor
CTV990106 TELEVISION TECHNICAL BULLETIN
Month of Issue: January 1999 Classification: White Page 1 of 1
CTV990707 TELEVISION TECHNICAL BULLETIN
MODELS 66DW18H 76DW18H Month of Issue: July 1999 Classification: White Page 1 of 1
MODELS
66DW18H
76DW18H
SYMPTOM No picture - blank raster. CAUSE SYMPTOM In the RGB mode, the picture is displaced to the right. ACTION REF NO R1810 R1811 R1812 R1810, R1811 and R1812 changing in value. Replace R1810, R1811 and R1812.
CAUSE ACTION
Error in the EEPROM data. While in the service mode, change the data in the following location. NVM Page : NVM Address : Data : 08 5C 45 (was 36)
DESCRIPTION Resistor 33k, 1/8W Resistor 33k, 1/8W Resistor 33k. 1/8W
PART NUMBER VRD-RA2BE333J VRD-RA2BE333J VRD-RA2BE333J
PRICE CODE AB AB AB
Location of R1810, R1811 and R1812 on the CRT PWB
Sharp Electronics (UK) Limited
Sharp Electronics (UK) Limited Originator AvW Supervisor Approval Date / / Reference GE84600X Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
Reference AM270799 Revision 2
White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
CTV991003 TELEVISION TECHNICAL BULLETIN
MODELS 66DW18H 76DW18H Month of Issue: October 1999 Classification: White Page 1 of 1
CTV991004 TELEVISION TECHNICAL BULLETIN
MODELS 66DW18H 76DW18H Month of Issue: October 1999 Classification: White Page 1 of 1
SYMPTOM Failure of Q509. CAUSE ACTION Excessive excursions of the positive forty volt supply from the line stage. Fit an extra zener diode, D632, in the position of R626 as shown in the diagram below.
SYMPTOM The reciever does not turn on - mains fuse blown. CAUSE ACTION Bridge rectifier diodes short circuit (D701, D702, D703 and D704). Replace D701, D702, D703 and D704 with the part specified below.
Note that this diode has been fitted during production as of the following serial numbers. REF NO 66DW18H 76DW18H REF NO D632 712620 714463 PART NUMBER RH-EX0431BMZZ PRICE CODE AA
D703
DESCRIPTION Diode, RM4ALF-L1 Diode, RM4ALF-L1 Diode, RM4ALF-L1 Diode, RM4ALF-L1
PART NUMBER RH-DX0317BMZZ RH-DX0317BMZZ RH-DX0317BMZZ RH-DX0317BMZZ
PRICE CODE AD AD AD AD
DESCRIPTION Zener diode, 47V
D701 D702 D703 D704
New
R611
Old
40V D608 R626 C621 D632
D701
D704 D702
Sharp Electronics (UK) Limited
Reference UK84602X Revision 1 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
Sharp Electronics (UK) Limited
Reference UK93000X Revision 1 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
CTV990107
Month of Issue: Classification:
CTV990107
Month of Issue: Classification:
TELEVISION TECHNICAL BULLETIN
January 1999 White Page 1 of 3
TELEVISION TECHNICAL BULLETIN
THOMSON PICTURE TUBE
January 1999 White Page 2 of 3
MODELS
66DW18H
Red
Orange
Yellow FV lead
Green
REASON
During production, the CRT has been changed from a Philips to a Thomson type.
FH lead
ACTION
When replacing a Philips CRT for a Thomson one, carry out the following. 1. 2. 3. 4. 5. Replace the CRT. Replace wires FH, FV and KC as indicated on the following pages. Replace R609 with a 2.2R, 5% 2W resistor. Replace C601 with a 8.2nF, 1.5kV capacitor. Add a 4.7nF, 1.6kV capacitor in parrelel with C601. This is screen printed on the top of the mother PWB as C633 (see page 9 of the service manual). 6. Remove SMD resistor R804. 7. On the CRT socket PWB, add two 100nF, 5% 63V capacitors, designated C1860 and C1862 (see page 11 of the service manual component side of the PWB).
KC lead
When replacing a Thomson CRT for a Philips one, carry out the reverse of the above. DESCRIPTION 66cm CRT, 16:9 Wire lead Resistor, 2.2R, 2W Capacitor 8.2nF, 1.5kV Capacitor 4.7nF, 1.5kV Capacitor 100nf, 63V Capacitor 100nf, 63V PART NUMBER VB66EGV2322*N QCNW-2775BMZZ VRN-VV3DB2R2J RC-FZ0147BMZZ RC-FZ0148BMZZ RC-FZ9104BMNJ RC-FZ9104BMNJ PRICE CODE CT AF AA AE AD AB AB
REF NO VB KC R609 C601 C633 C1860 C1862
To change the deflection yoke wiring from a Philips CRT to a Thomson CRT, proceed as follows. 1. 2. 3. 4. 5. 6. Unsolder the red and orange FH leads from the deflection yoke. Remove connector 1 from the yellow and green leads. Strip the yellow and green wires of insulation (about 4mm). Solder the red and orange (FH) leads as shown above. Solder the yellow and green (FV) leads as shown above. Replace lead KC (QCNW-2757BMZZ) connects the CRT socket to the neck of the CRT with QCNW-2775BMZZ type.
Sharp Electronics (UK) Limited Approval Date / / Reference SP84001X Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units Originator AvW Supervisor
Sharp Electronics (UK) Limited Approval Date / / Reference SP84001X Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units Originator AvW Supervisor
CTV990107
Month of Issue: Classification:
CTV991202 TELEVISION TECHNICAL BULLETIN
MODELS 66DW18H 76DW18H Month of Issue: December 1999 Classification: White Page 1 of 1
TELEVISION TECHNICAL BULLETIN
PHILIPS CRT Original deflection yoke PWB shown on left
January 1999 White Page 3 of 3
76EF19H
76EF20H
CONNE
Orange Red Yellow Green
Connector 1
SYMPTOM The following problems can occur on the 100Hz PWB.
Yellow Red Orange Green
· · ·
·
Intermittent digital noise on the picture Intermittent mosaic squares on the picture Mosaic effect if the 100Hz PWB is tapped Red, green or blue screen if the 100Hz PWB is tapped
KC lead
CAUSE
Problems around the field mixer IC, SDA9270. · · IC6108 in the 66DW18H and 76DW18H IC6105 in the 76EF19H and 76EF20H
ACTION
Carry out the following counter measures. 1. Make sure that there are no dry joints on the Mother PWB 2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove IC6108/IC6105 Note that you can operate the 100Hz PWB with the shield cans removed. It is important that these are returned to there original condition when the job is completed.
To change the deflection yoke wiring from a Thomson CRT to a Philips CRT, proceed as follows 1. 2. 3. Unsolder both the green and yellow (FV) and red and orange (FH) leads from the deflection yoke PWB. Solder these leads to the Philips CRT as shown above. Replace wire KC (QCNW-2775BMZZ) that connects from the CRT socket PWB to the neck of the CRT with lead QCNW-2757BMZZ.
Sharp Electronics (UK) Limited
Sharp Electronics (UK) Limited Originator AvW Supervisor Approval Date / / Reference SP84001X Revision 2 White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
Reference JR031299-1 Revision 2
White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units