Hyundai plasma/LG inside

[PowerAmpFreak]

Hello.
A friend of mine heard a loud bang and the screen went very dark, though he still see a picture. The set is LG stuff inside, Ysus and Zsus.
Does this indicate a Zsus failure? The usual hybrid sickness?
Some days before the bang he heard strange noise come and go from the set, though no picture problems.

[Wizard]

Re: Hyundai plasma/LG inside

Bang is a exploded big capacitor or a YSUS board went or Y-buffer board. Examine them and check fuses.

Cheers, Wizard

[PowerAmpFreak]

Re: Hyundai plasma/LG inside

I powered up the set. Again, loud bang from Ysus.
Fuses ok on both Ysus and Zsus, but hybrid on Ysus smells burned.
A question, is it any problem or risk to power up the smps without Ysus board to check if smps regulates correctly on Va and Vs outputs?
Or will the logic block the smps from running if powered up without Ysus?

[PlainBill]

Re: Hyundai plasma/LG inside

I powered up the set. Again, loud bang from Ysus.
Fuses ok on both Ysus and Zsus, but hybrid on Ysus smells burned.
A question, is it any problem or risk to power up the smps without Ysus board to check if smps regulates correctly on Va and Vs outputs?
Or will the logic block the smps from running if powered up without Ysus?

LG's training manual suggests unplugging power cable to V-sus and Z-sus if the power supply won't come up to identify the cause of the failure. Sounds like that is an acceptable practice.

PlainBill

[PowerAmpFreak]

Re: Hyundai plasma/LG inside

Changed Ysus and buffer boards. A real hassle to get the flatwires into the sockets on the buffers...can't imagine how anyone would come up with this weird solution. Anyway, the set works now. The bang that was heard came from the Ysus hybrid, though fuse Ok.