Sharp 66GS-62 (serv.man24) Service Manual / Technical Bulletin ▷ View online
CTV 2004 03 04
Month of Issue:
March 2004
Classification:
White
TELEVISION TECHNICAL BULLETIN
Page 1 of 2
Sharp Electronics (UK) Limited
Reference AvW 10 03 2004 - 4
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
MODEL
66GS62H
Memory and Processor Problems with the GA10 Chassis
Processor and memory problems can manifest themselves in many and varied ways. Sometimes intermittent, but
normally permanent, most of these can be resolved by reprogramming or blanking the non-volatile memory (NVM).
normally permanent, most of these can be resolved by reprogramming or blanking the non-volatile memory (NVM).
Resetting the NVM
It is recommended that reprogramming the NVM with data downloaded from the Sharp Technical Website is carried out
if data corruption is suspected. However, if no programming facility is available, the NVM can be blanked by using one
of the ‘jigs’ listed below.
It is recommended that reprogramming the NVM with data downloaded from the Sharp Technical Website is carried out
if data corruption is suspected. However, if no programming facility is available, the NVM can be blanked by using one
of the ‘jigs’ listed below.
There are two types of jig, depending upon which type of NVM is fitted. The type of NVM is related to the processor
and PWB version used.
and PWB version used.
PWB type
NVM type
Part number of Jig required
Version 4 or lower
24645
GS-SERV-JIG01
Version 5 or higher
24C16
GS-SERV-JIG02
To use the jig, follow the steps outlined below.
1. Remove the original EEPROM IC (IC1002).
2. Plug the correct blanking jig into the empty socket (ensure that it is correctly inserted).
3. Turn the set on.
4. Wait for one minute.
5. Turn set off.
6. Remove jig from socket.
7. Plug original IC1002 back into socket.
8. Turn on set and wait for data to be downloaded into the NVM.
9. Tune in and adjust as necessary.
2. Plug the correct blanking jig into the empty socket (ensure that it is correctly inserted).
3. Turn the set on.
4. Wait for one minute.
5. Turn set off.
6. Remove jig from socket.
7. Plug original IC1002 back into socket.
8. Turn on set and wait for data to be downloaded into the NVM.
9. Tune in and adjust as necessary.
Differences in the Processor, NVM and EEPROM
During production, the processor was changed for an alternative type and this resulted in a change of the NVM and
EEPROM. For further details of these changes, please refer to the Part Changes and Corrections Technical Bulletin.
During production, the processor was changed for an alternative type and this resulted in a change of the NVM and
EEPROM. For further details of these changes, please refer to the Part Changes and Corrections Technical Bulletin.
Typical NVM Problems
As mentioned above, NVM problems are many and varied, but the more typical ones are listed below. If in any doubt
as to whether the fault is caused by a corruption of the NVM, reprogram it.
As mentioned above, NVM problems are many and varied, but the more typical ones are listed below. If in any doubt
as to whether the fault is caused by a corruption of the NVM, reprogram it.
Blank raster
To cure this problem, either reprogram or blank the NVM. A blank raster can also be caused by faults in the vertical
stage – see the Picture Problems Technical Bulletin for more information about this.
To cure this problem, either reprogram or blank the NVM. A blank raster can also be caused by faults in the vertical
stage – see the Picture Problems Technical Bulletin for more information about this.
Set Comes on then Shuts Down
Either reprogram or blank the NVM. This problem may cause the power supply to go into the standby mode, or just
inhibit the line or east/west drive signals. Checking waveforms and voltages may be misleading with this fault scenario.
Either reprogram or blank the NVM. This problem may cause the power supply to go into the standby mode, or just
inhibit the line or east/west drive signals. Checking waveforms and voltages may be misleading with this fault scenario.
CTV 2004 03 04
Month of Issue:
March 2004
Classification:
White
TELEVISION TECHNICAL BULLETIN
Page 2 of 2
Sharp Electronics (UK) Limited
Reference AvW 10 03 2004 - 4
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
Low audio levels on SCART inputs
This normally happens after the NVM has been blanked. Set up the NVM as follows:
This normally happens after the NVM has been blanked. Set up the NVM as follows:
24645 Type NVM
24C16 Type NVM
Page
Address
Value
Page
Address
Value
08
72
2A
03
4E
14
08
73
00
03
4F
00
03
50
14
03
51
00
Red, Green and Blue Lines at the Top of the Picture
Lines at the top of the picture can be caused by corruption of the memory, check and set the NVM locations as follows.
The fault can also happen if the +25V is low to the vertical flyback circuit or if there is a fault in the vertical, reducing the
flyback level.
Lines at the top of the picture can be caused by corruption of the memory, check and set the NVM locations as follows.
The fault can also happen if the +25V is low to the vertical flyback circuit or if there is a fault in the vertical, reducing the
flyback level.
24645 Type NVM
24C16 Type NVM
Page
Address
Value
Page
Address
Value
0C
EB
10
05
D6
10
0C
F7
1A
05
E2
1A
Low Brightness in the Service Mode Only
Due to a corruption in the EEPROM, when entering the service mode on some earlier GA10 chassis’s, the picture is
dark. By using the channel up button to step to one of the RGB gain settings, the brightness will increase to a
watchable level. Service adjustments can now be carried out normally.
Due to a corruption in the EEPROM, when entering the service mode on some earlier GA10 chassis’s, the picture is
dark. By using the channel up button to step to one of the RGB gain settings, the brightness will increase to a
watchable level. Service adjustments can now be carried out normally.
This is not considered to be a major problem as it does not affect the customers viewing. To cure the problem would
require replacing IC1002 and IC1003.
require replacing IC1002 and IC1003.
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
-
Blanking Jig for 24645
GS-SERV-JIG01
AZ
-
Blanking Jig for 24C16
GS-SERV-JIG02
AZ
IC1002
EEPROM
Depends upon chassis – See parts issue Technical Bulletin
IC1003
NVM
Depends upon chassis – See parts issue Technical Bulletin
Note that the list of components given above IS NOT a parts list to cure all memory and processor related problems in
this chassis. It has been compiled to show all the part numbers for items refered to in this document. If the parts noted
in the text are not faulty, carry out fault finding procedures to locate the problematic part.
this chassis. It has been compiled to show all the part numbers for items refered to in this document. If the parts noted
in the text are not faulty, carry out fault finding procedures to locate the problematic part.
Display
