The discovery of an anomaly with ground equipment used to prepare the Ariane 5 launcher has resulted in Arianespace's decision to perform additional checks.
This operation should take a few days and will lead to an equivalent delay in the launch, initially scheduled for July 11.
A new launch date will be announced shortly.
Initiated in 2000, the iPSTAR launch has been postponed at least three times since mid-2003 due to time-consuming construction and testing processes.
The company claims that iPSTAR will be the world's largest commercial satellite.
iPStar carries about 45Gbps, 20 times more bandwidth than its predecessor, Thaicom 3.
Shin Satellite is 51%-owned by Shin Corp., the telecommunications conglomerate founded by Prime Minister Thaksin Shinawatra.
