Sharp LC-50LE751K (serv.man9) Service Manual / Technical Bulletin ▷ View online
LCD 2013 12 06
Date of Issue: 23
rd
December 2013
Classification:
White
LCD TELEVISION TECHNICAL BULLETIN
Page 1 of 8
Sharp Electronics (UK) Limited
Reference
– RG23122013-1
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
MODELS
LCxxLE651K
LCxxLE751K
REASON
Unit will not respond to remote control (Restricted access sign appears).
During the BOOT stage only the SHARP logo appears.
Blue pyramid LED with no picture on-screen (Permanent).
After replacing the main board, t
During the BOOT stage only the SHARP logo appears.
Blue pyramid LED with no picture on-screen (Permanent).
After replacing the main board, t
he unit is stuck in a yellow “K” mode (Service mode).
Red LED and no function but the LED flashes when using the remote control.
ACTION
Follow the advice provided in Technical Bulletin LCD 2013 10 16 first. If the advice
provided in LCD 2013 12 16 does not resolve the problem, follow the information
provided in this bulletin.
provided in LCD 2013 12 16 does not resolve the problem, follow the information
provided in this bulletin.
To write the NVM, you need to purchase or assemble a RS-232 cable.
The following information describes how to use RS-232 commands on the LE651/751
series. We have also provided information on the adaptor cable required.
series. We have also provided information on the adaptor cable required.
RS-232 cable - USB
The LE651/751 series do not support RS232 connectivity with a standard D-Sub 9 pin
connector and instead use a 3.5mm jack input.
To use this input for RS232 control it is necessary to adapt a connector cable. Please
follow the instructions below on how to construct the cable.
The LE651/751 series do not support RS232 connectivity with a standard D-Sub 9 pin
connector and instead use a 3.5mm jack input.
To use this input for RS232 control it is necessary to adapt a connector cable. Please
follow the instructions below on how to construct the cable.
Note - Sharp recommend purchasing the following TTL-232R-3V3 cable type -
Information about the cable is available from -
http://www.ftdichip.com/Support/Documents/DataSheets/Cables/DS_TTL-232R_CABLES.pdf
Note
– Cable colours may change. Test and note the pin connections before the
cable is cut.
LCD 2013 12 06
Date of Issue: 23
rd
December 2013
Classification:
White
LCD TELEVISION TECHNICAL BULLETIN
Page 2 of 8
Sharp Electronics (UK) Limited
Reference
– RG23122013-1
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
RS-232 cable
– 9-pin Serial
The cable specified uses a 232 level converter.
The level converter changes the signal from PC (12V) to TTL (3.3V).
You can make your own cable by purchasing the components separately
(Commercially available) and following the information provided in this circuit diagram.
The level converter changes the signal from PC (12V) to TTL (3.3V).
You can make your own cable by purchasing the components separately
(Commercially available) and following the information provided in this circuit diagram.
Note
– Use the MAX3232 IC or similar as this supports 5V and 3.3V.
You can also purchase adaptor separately.
As recommended by our dealers, the 232LPTTL33 from B&B Electronics is proven to
provide a solution if you cannot build the circuit below.
http://www.bb-elec.com
If you do not use the cable / level converter information provided, damage may occur
to the LCxxLE651/751K unit.
The information provided is guidelines only and all cables should be tested prior to
use.
LCD 2013 12 06
Date of Issue: 23
rd
December 2013
Classification:
White
LCD TELEVISION TECHNICAL BULLETIN
Page 3 of 8
Sharp Electronics (UK) Limited
Reference
– RG23122013-1
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
RS-232 communication conditions
Set the RS-232C communications settings on the
Set the RS-232C communications settings on the
PC to match the TV’s
communications conditions. The TV’s communications settings are as follows:
Baud rate
Baud rate
115,200 bps
Data length
8 bits
Parity bit
None
Stop bit
1 bit
Flow control
None
RS-232 communication procedure
Send the control commands from the PC via the RS-232C connector.
The TV operates according to the received command and sends a response message
to the PC.
Do not send multiple commands at the same time.
Wait until the PC receives the OK response before sending the next command.
Make sure to send “AAA” with the carriage return and confirm that “ERR” returns
before operating.
LCD 2013 12 06
Date of Issue: 23
rd
December 2013
Classification:
White
LCD TELEVISION TECHNICAL BULLETIN
Page 4 of 8
Sharp Electronics (UK) Limited
Reference
– RG23122013-1
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
RS-232 command format
Eight ASCII code +CR
Eight ASCII code +CR
RS-232 command parameter
Input the parameter values, aligning left, and fill with blank(s) for the remainder
(ensure that four values are input for the parameter).
When the input parameter is not within an adjustable
range, “ERR” returns (refer to
“Response code format”).
When “?” is input for some commands, the present setting value responds.
RS-232 response code format
Display
