Problem with decrypting dvb-s channels

I have a Technotrend S-1500 DVB card:
04:01.0 Multimedia controller: Philips Semiconductors SAA7146 (rev 01)
	Subsystem: Technotrend Systemtechnik GmbH Device 1017
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 64 (3750ns min, 9500ns max)
	Interrupt: pin A routed to IRQ 17
	Region 0: Memory at febffc00 (32-bit, non-prefetchable) [size=512]
	Kernel driver in use: budget_ci dvb
	Kernel modules: budget-ci

$ dmesg | grep dvb
[   17.596948] saa7146: register extension 'budget_ci dvb'.
[   17.673434] budget_ci dvb 0000:04:01.0: PCI INT A -> GSI 17 (level,
low) -> IRQ 17
[   17.742536] input: Budget-CI dvb ir receiver saa7146 (0) as
/devices/pci0000:00/0000:00:1e.0/0000:04:01.0/input/input7
[   17.851584] dvb_ca adapter 0: DVB CAM detected and initialised successfully
[   26.880221] dvb_ca adapter 0: DVB CAM detected and initialised successfully
[  769.995583] dvb_ca adapter 0: DVB CAM detected and initialised successfully
[ 2017.120157] dvb_ca adapter 0: DVB CAM detected and initialised successfully
[ 2034.781417] dvb_ca adapter 0: DVB CAM detected and initialised successfully
[265057.101369] dvb_ca adapter 0: DVB CAM detected and initialised successfully


I have tried several players. MythTV, MPlayer, Kaffeine. All of them
shows unencrypted channels OK, but will not play any of the encrypted
channels.

This was working fine a couple of months back with the same HW. My
MythTV frontend was broken so I did not use the system. When I tried
again now it is not working as described above.

I have tried to boot an older kernel, and the same problem exists. As
I see it it is probably a HW problem, but what do you think is my
faulty HW? I would prefer not to buy all new (DVB-S card, CI, and
CAM).

Is it possible somehow to find out what is the faulty unit?

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