diff --git a/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer b/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer
index a306b0ba5..f9fe6772d 100755
Binary files a/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer and b/slsDetectorServers/xilinx_ctbDetectorServer/bin/xilinx_ctbDetectorServer_developer differ
diff --git a/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c
index b7acce53d..8762ad4af 100644
--- a/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/xilinx_ctbDetectorServer/slsDetectorFunctionList.c
@@ -426,7 +426,8 @@ void setupDetector() {
     for (int idac = NDAC_ONLY; idac < NDAC; ++idac) {
         if (idac == D_PWR_EMPTY)
             continue;
-        initError = setPower(idac, 0, initErrorMessage);
+        int min = (idac == D_PWR_IO) ? VIO_MIN_MV : POWER_RGLTR_MIN;
+        initError = setPower(idac, min, initErrorMessage);
         if (initError == FAIL)
             return;
     }
@@ -1406,6 +1407,7 @@ int setPower(enum DACINDEX ind, int val, char *mess) {
 
     LOG(logINFO, ("Setting Power %s to %d mV\n", powerNames[pwrIndex], val));
 
+    int startup = (dacValues[ind] == -1) ? 1 : 0;
     powerEnable(0, pwrIndex);
 
     if (val > 0) {
@@ -1428,7 +1430,9 @@ int setPower(enum DACINDEX ind, int val, char *mess) {
         }
         dacValues[ind] = dacval;
 
-        powerEnable(1, pwrIndex);
+        // dont power on at startup (was -1 before)
+        if (startup == 0)
+            powerEnable(1, pwrIndex);
     }
 
     return OK;
diff --git a/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp b/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp
index de2c2c372..65c8eadd3 100644
--- a/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp
+++ b/slsDetectorSoftware/tests/Caller/test-Caller-chiptestboard.cpp
@@ -1060,9 +1060,9 @@ TEST_CASE("v_abcd", "[.cmdcall]") {
                 if (det_type == defs::XILINX_CHIPTESTBOARD &&
                     det.isVirtualDetectorServer().tsquash(
                         "inconsistent virtual values")) {
-                    // prev value for power regulators should have been 1200
-                    // (set in config) as they are only touched in this test
-                    REQUIRE(prev_val.squash(-1) == 1200);
+                    // prev value for power regulators should have been minimum
+                    // as they are only touched in this test
+                    REQUIRE(prev_val.squash(-1) > 0);
                     REQUIRE_THROWS(caller.call(cmds[i], {"-100"}, -1, PUT));
                 }
 
diff --git a/slsSupportLib/include/sls/versionAPI.h b/slsSupportLib/include/sls/versionAPI.h
index 890b0e0ef..d25928c77 100644
--- a/slsSupportLib/include/sls/versionAPI.h
+++ b/slsSupportLib/include/sls/versionAPI.h
@@ -7,6 +7,6 @@
 #define APIGOTTHARD2 "0.0.0 0x260116"
 #define APIMOENCH    "0.0.0 0x260116"
 #define APIEIGER     "0.0.0 0x260116"
-#define APIXILINXCTB "0.0.0 0x260116"
+#define APIXILINXCTB "0.0.0 0x260123"
 #define APIJUNGFRAU  "0.0.0 0x260116"
 #define APIMYTHEN3   "0.0.0 0x260116"
diff --git a/tests/scripts/utils_for_test.py b/tests/scripts/utils_for_test.py
index 80b3f2b47..bff86f886 100644
--- a/tests/scripts/utils_for_test.py
+++ b/tests/scripts/utils_for_test.py
@@ -234,11 +234,6 @@ def loadConfig(name, rx_hostname = 'localhost', settingsdir = None, log_file_fp
             d.powerchip = 1
 
         if name == "xilinx_ctb":
-            d.v_a = 1200
-            d.v_b = 1200
-            d.v_c = 1200
-            d.v_d = 1200
-            d.v_io = 1200
             d.configureTransceiver()
 
         if settingsdir is not None and name in ['eiger', 'mythen3']: