I know it is a very basic question but can you please let me know the solution and answer of it.
I have a demat account in ICICI direct and subscribed for iDeas facility of NSDL using ICICI Direct demat account data. If I close the ICICI direct account will iDeas account get automatically closed?
Will this closure impact on my other broker accounts with NSDL and CDSL?
Not sure about this. Will check and get back to you on this.
No, this will not have any impact on your other demat accounts.
Looking for the answer 
No, the iDeas login will continue to work, but you won’t find any details of your ICICI account since it’s closed. If you’ve grouped other demat accounts under the same login, the details pertaining to such other accounts will continue to show.
What If only ICICI Direct account is linked only? Will it automatically closed? @VenuMadhav
Also, can you please tell me does iDeas and speede facility also related with zerodha?
No, it won’t. There’s no point having access to speed-e if you don’t have any any account linked to it.
Ideas and speede are products offered by NSDL. Zerodha opens demat accounts with CDSL. The corresponding products from CDSL are called easiest and easi.
Please look up answers since these are already explained on this forum/Zerodha’s support articles.
So what you mean is that once we register on ideas/speede we cannot de-register even we closed the account with The broker that data is used to create account in ideas/speede.