Have TV Questions? Ask a TV Technician
Hi , i`m Jack
If you just want the service manuals that is no problem but they won`t help you much (if at all) with the RS-232 programming
Here are some documents that may interest you ;
As you probably already know you will need a null modem cable for this
All the documents that can be found on this are provided with specific software and/or hardware
If you still want the 2 service manuals i could give you that as well but unless your tv is broken it wont help at all
click the link below and if that link opens a login window popup then just close it with the upper corner X or the "no thanks . continue to view"The manual is behind that , wait for it to open and use the DOWNLOAD button .
This one is larger ; https://www.dropbox.com/s/cix9f7p3f49hfux/sharp_lc-90le657u_pwb_unit_editioc_lcd_tv.pdf?dl=0
Not sure why I did not look there at first but look in the owner`s manual page 46 ;
This is it now , my bag of tricks is empty
If that answers your question please do not forget to rate by clicking on the star icons at the top, then click on Submit so i get paid for my time helping you .