diff --git a/langchain/chains/graph_qa/cypher.py b/langchain/chains/graph_qa/cypher.py
index 68966cd277d..3ccdcb93fd0 100644
--- a/langchain/chains/graph_qa/cypher.py
+++ b/langchain/chains/graph_qa/cypher.py
@@ -47,11 +47,16 @@ class GraphCypherQAChain(Chain):
         *,
         qa_prompt: BasePromptTemplate = CYPHER_QA_PROMPT,
         cypher_prompt: BasePromptTemplate = CYPHER_GENERATION_PROMPT,
+        qa_chain: LLMChain = None,
+        cypher_generation_chain: LLMChain = None,
         **kwargs: Any,
     ) -> GraphCypherQAChain:
         """Initialize from LLM."""
-        qa_chain = LLMChain(llm=llm, prompt=qa_prompt)
-        cypher_generation_chain = LLMChain(llm=llm, prompt=cypher_prompt)
+        if qa_chain is None:
+            qa_chain = LLMChain(llm=llm, prompt=qa_prompt)
+
+        if cypher_generation_chain is None:
+            cypher_generation_chain = LLMChain(llm=llm, prompt=cypher_prompt)
 
         return cls(
             qa_chain=qa_chain,
diff --git a/langchain/graphs/neo4j_graph.py b/langchain/graphs/neo4j_graph.py
index 4433771a255..a077a0f469d 100644
--- a/langchain/graphs/neo4j_graph.py
+++ b/langchain/graphs/neo4j_graph.py
@@ -43,27 +43,7 @@ class Neo4jGraph:
         self._driver = neo4j.GraphDatabase.driver(url, auth=(username, password))
         self._database = database
         self.schema = ""
-        # Verify connection
-        try:
-            self._driver.verify_connectivity()
-        except neo4j.exceptions.ServiceUnavailable:
-            raise ValueError(
-                "Could not connect to Neo4j database. "
-                "Please ensure that the url is correct"
-            )
-        except neo4j.exceptions.AuthError:
-            raise ValueError(
-                "Could not connect to Neo4j database. "
-                "Please ensure that the username and password are correct"
-            )
-        # Set schema
-        try:
-            self.refresh_schema()
-        except neo4j.exceptions.ClientError:
-            raise ValueError(
-                "Could not use APOC procedures. "
-                "Please install the APOC plugin in Neo4j."
-            )
+        self.refresh_schema()
 
     @property
     def get_schema(self) -> str: