Got rid of 7 blinks by changing the usual 6 IGBTs and the FETs & Fuse on the P board that always seem to go on the 42's.
Changed IC502 which was dead, but not Q531 which diode-checks OK.
First look at the 6-blinks, found Q441 suspect (not short, but lowish resistance) so tried an FGD4536. Mid voltage 190v... no good. Salvaged a DG302 from a spare SS board and still 6 blinks, but Mid is now 85 volts (a bit low) until the point where shutdown is initiated, and then it instantly shoots up to around 200v....is that normal? (Given that at the moment I don't know why it is shutting down).
The green LED on the SN illuminates briefly, but not the one on the SS, and no fan start.
15v, 5v, Vscan, Vad, all normal.
I have a 100w lamp in the Vsus, but it's hitting 215v OK.
Is there a way to confirm it's the SN board without disconnecting C20 from the C2 board as described in the troubleshooting flowchart (which looks to be inaccessible)?
Thanks
Changed IC502 which was dead, but not Q531 which diode-checks OK.
First look at the 6-blinks, found Q441 suspect (not short, but lowish resistance) so tried an FGD4536. Mid voltage 190v... no good. Salvaged a DG302 from a spare SS board and still 6 blinks, but Mid is now 85 volts (a bit low) until the point where shutdown is initiated, and then it instantly shoots up to around 200v....is that normal? (Given that at the moment I don't know why it is shutting down).
The green LED on the SN illuminates briefly, but not the one on the SS, and no fan start.
15v, 5v, Vscan, Vad, all normal.
I have a 100w lamp in the Vsus, but it's hitting 215v OK.
Is there a way to confirm it's the SN board without disconnecting C20 from the C2 board as described in the troubleshooting flowchart (which looks to be inaccessible)?
Thanks
Comment