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DA100 (50Hz) Chassis – Article for Television Magazine 

Neon

illuminated

NICAM or OPC

LED's illuminated

 Check Bridge Rectifier,Q701, Q702,

Q703 and D712

No

Short Circuit

Check HT

(D720 Cathode)

Ok

Yes

Check data communication

(see LED's Fault code table)

No

Short circuit on a supply other

than the main HT

goto chart 2

140v

Between 20 - 40 Volts

Zero

Press CH+ button

on main PWB

No

Yes

Standby mode

Ensure that the loudspeakers are connected

Check IC1001 pin 100

(5v = Normal\zero= standby)

Check IC702

Power Supply

Starts

No Change

Power Supply Starts

For A Few Seconds Only

Before switching on ensure that the aerial is not connected

Check IC702

pin15 = 0v

Check

 D735 and

C720

replace IC705

Note:

Always fit the latest four pin device.
(Technical bulletin CTV2002 05 02)

Replace R713 and R714.

Check D712, Q702 and Q703

Yes

Note:

An avalanche diode (D735) has been added across C720

Later production D735 has its own location

Sharp Electronics (UK) Limited - March 2003 

DA100 (50Hz) Chassis – Article for Television Magazine 

No

Reduced Vertical Scan

Yes

Check data communication

(see LED's Fault code table)

re-program NVM if necessary

Check Video input selection

 and IF stage

Correct

Waveform

Yes

Check Q607 (crow bar)

and IC801

Check D617 and amplitude of the line fly-back pulse

Less Than1.8v

More Than 1.8v

Before switching on ensure that the aerial is disconnected

   1) Ensure IC501 pin 12 = 5v
   2) Check IC501 +/- supply
   3) Re-program NVM

1) If R501 is over heating, reprogram NVM.

2) Check R530,Q502,Q503,Q507 and D507

Yes

Incorrect

Waveform

No Vertical Scan

No

No

Q912 and associated

components

Low

Check IC1801

Note:

If screen control is not

correctly adjusted then

stepping brightness will occur

Ok

Sharp Electronics (UK) Limited - March 2003 

 

DA100 (50Hz) Chassis – Article for Television Magazine 

Each chassis has a method of flashing the LED’s on the front of the set to indicate whether various 
devices connected to the I2C bus are operational.  These codes are shown in the table below. 

off

On

2 Flashes/Pause

Off

3 Flashes/Pause

Off

4 Flashes/Pause

Off

On

On

On

1 Flash/Pause(1:3)

Green - On

Orange - On

Green - On

Orange - Off

Green - Off

Orange - Off

FW-SERV-JIG01

OTP (5v device)

HW-SERV-JIG01

MTP (3v3 device)

Used with PWB's that have double sided c

PC interface

keeps repeating boot sequence

See technical bulletin CTV2002 04 01

Not used in HW models

Boot sequence can repeat six times before 
the fault code is displayed.

Time taken for re-boot will vary depending 
on what section is faulty.

NVM normally are not faulty they only need 
re-programming. Default NVM data is 
contained in the EPROM.

When replacing EPROM always blank the 
NVM first.

 

Note that the HW sets do not have an OPC LED, so the following ‘jig’ will have to be made.   

 

Sharp Electronics (UK) Limited - March 2003 

DA100 (50Hz) Chassis – Article for Television Magazine 

Sharp Electronics (UK) Limited - March 2003 

There have been a number of parts changes to this chassis during its four-year life span.  This can be 
frustrating when referring to the service manual parts listing and the parts do not tie up.  Normally 
the changes revolve around CRT types, fitting of the Power Factor Module and introduction of the 
double copper chassis.   
For the double copper chassis an alternative service manual is available and other changes can be 
noted from the Sharp Technical Web (account holders only).  Non account holders can obtain this 
information from Alan Dyson’s Techline Services (0906 861 5915).  Service literature can be bought 
from Willow Vale Electronics or CPC. 

A number of remote control covers are available for these television models.  The type of cover is 
different for the type of remote control, refer to the table below for the correct cover part number. 
 

RRMCG1060BMSA 
RRMCG1070BMSA 
RRMCG1071BMSA 
RRMCGA006WJSA 

GCOVHA009WJSA 

RRMCG1073BMSA GCOVHA010WJSA 
RRMCG1059BMSA GCOVHA013WJSA 

 

Note that there are a number of different types of CRT fitted to certain models (see lists at the 
start of this article).  It is very important that the chassis and CRT types.  Because of this, Sharp 
have a special ordering procedure when account holders need a CRT.