Hi Guys. I'm hoping to get some help with my Samsung PS58C7000YFXXY. A few nights ago we lost picture after a small “pop”. It still has sound and like many of these Samsung plasmas had the occasional purple banding on brighter scenes.
Anyway, I ripped the back off hoping to find burnt remains of something but cannot see or smell anything!
This TV has the BN44-0034A SMPS and as far as I can tell the TV is going into fault protection as the logic board LED flashing on for 5 seconds.
Vital Signs.
The Standby 5v is at 5.23v, and the PS-ON shifts from 3.26v – 0.1v when powered on.
However Vs-ON shifts from 0v to 3.27v but then back to 0v and stays there. This over the first few seconds the TV is turned on.
Over the same first few seconds, Vs and Va rise to 209v and 54v respectively, both 1v under the labelled voltage - but then fall back down and settling at 14v for Vs and 1v for Va.
Fuses on the SMPS, Y-Main, X-Main and one surface mount on the E-Buffer are all ok.
I believe the SMPS will only fire up briefly if Y-Main and X-Main are disconnected so disconnecting those boards won't help the trouble shooting process. I did confirmed this, the voltage rails have the same behaviour with X and Y Main disconnected.
Any ideas would be most appreciated and hopefully may help others that find themselves in the Samsung Sound but no Picture Club.
Anyway, I ripped the back off hoping to find burnt remains of something but cannot see or smell anything!
This TV has the BN44-0034A SMPS and as far as I can tell the TV is going into fault protection as the logic board LED flashing on for 5 seconds.
Vital Signs.
The Standby 5v is at 5.23v, and the PS-ON shifts from 3.26v – 0.1v when powered on.
However Vs-ON shifts from 0v to 3.27v but then back to 0v and stays there. This over the first few seconds the TV is turned on.
Over the same first few seconds, Vs and Va rise to 209v and 54v respectively, both 1v under the labelled voltage - but then fall back down and settling at 14v for Vs and 1v for Va.
Fuses on the SMPS, Y-Main, X-Main and one surface mount on the E-Buffer are all ok.
I believe the SMPS will only fire up briefly if Y-Main and X-Main are disconnected so disconnecting those boards won't help the trouble shooting process. I did confirmed this, the voltage rails have the same behaviour with X and Y Main disconnected.
Any ideas would be most appreciated and hopefully may help others that find themselves in the Samsung Sound but no Picture Club.
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