How to preform updatepanel postback from javascript

Need to do a partial page post back from javascript, I have it now  but the whole page post back. When I set it to UpdateMode="Conditional" everything else on the page post back not the section I need.
<div class="box-3">
                                                                 Service<br />
<asp:UpdatePanel ID="UpdatePanel1" runat="server" > 
<asp:DropDownList ID="cmbNewService" runat="server" DataTextField="Serv_Type" DataValueField="pk_CarrierID">
<asp:LinkButton ID="LinkButton1" runat="server" style="display:none;" onclick="textboxchange" > 
LinkButton </asp:LinkButton>

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below is the java being called

  function raiseAsyncPostback() {
      __doPostBack("<%= me.LinkButton1.UniqueID %>", "");

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Change the code as follows and try

function raiseAsyncPostback() {
    document.getElementById("<%=  LinkButton1.UniqueID%>").click();

crundleAuthor Commented:
No effect, nothing was posted back. HTML code below from rendering.

 function raiseAsyncPostback() {
   // __doPostBack("ctl00$MainContent$LinkButton1", "");
 <div id="MainContent_UpdatePanel1">
                                                                        <select name="ctl00$MainContent$cmbNewService" id="MainContent_cmbNewService">
            <option value="1::1">Port\Port</option>
            <option value="1::2">Port\Door</option>
<a id="MainContent_LinkButton1" href="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(&quot;ctl00$MainContent$LinkButton1&quot;, &quot;&quot;, true, &quot;&quot;, &quot;&quot;, false, true))" style="display:none;">
Are your using the VS2010 and asp.Net 4.0 for the development,

then add the below attribute ClientIDMode="Inherit" to the control and check

<asp:LinkButton ID="LinkButton1" runat="server" style="display:none;" onclick="textboxchange" ClientIDMode="Inherit"
LinkButton </asp:LinkButton>
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Please use the below property as the HyperLink is not gettting in teh way as other control


<asp:LinkButton ID="LinkButton1" runat="server" style="display:none;" onclick="textboxchange" ClientIDMode="AutoID" >
LinkButton </asp:LinkButton>

Tested the smae it's workign fine


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crundleAuthor Commented:
tried both and didn't fire. I'll setup a demo page to see if something else is causing the problem.
I have identified the issue in the control declaration


<asp:LinkButton ID="LinkButton1" runat="server" style="visibility:hidden;" onclick="textboxchange" ClientIDMode="AutoID" > 
LinkButton </asp:LinkButton>

change the option display to visibility.
Check this for the clarification as why the event is not get fired for "dispaly:none"

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