Myrica p42-2H green shadows

[nostrike]

Re: Myrica p42-2H green shadows

have checked it 25 times Power button is at the button of the TV and are not holding it

[nostrike]

Re: Myrica p42-2H green shadows

Its weird. I Starts like normal, but when it should start up the screen, it shuts down.

[tom66]

Re: Myrica p42-2H green shadows

Does it behave differently if either sustain board is disconnected?

[nostrike]

Re: Myrica p42-2H green shadows

have tried disconnecting both boards. One at a time and at the same time.
TV clicks (switching on click), the power supply is buzzin. 1 click more.. 5 seconds, blinking front led.

[nostrike]

Re: Myrica p42-2H green shadows

Tried testing Vs power to Y-sustian. It gets 208 like it should. Maybe the board failed?

[tom66]

Re: Myrica p42-2H green shadows

It could be. Maybe the fluctuating voltage has damaged it. Do you own an oscilloscope?

[nostrike]

Re: Myrica p42-2H green shadows

no, I do not own one :S
Now the Front LED is not blinking, but is steady.
Did listen more to Power Supply. It is like the buzzing is
changing to another pattern after 5-10 seconds.

[tom66]

Re: Myrica p42-2H green shadows

Does the buzzing change if sustains are unplugged?

[nostrike]

Re: Myrica p42-2H green shadows

No, same buzzing sound
Or maybe. When they are connected,
it is more like a wave buzzing (up/down/up/down

[tom66]

Re: Myrica p42-2H green shadows

When it is switched on, can you turn it off normally with the remote control?

Sound is still good?

[nostrike]

Re: Myrica p42-2H green shadows

Yes, can turn on/off. Change channel. Mute and so on
All with remote.
Sound is perfect

[tom66]

Re: Myrica p42-2H green shadows

Very strange. I wish I knew what the problem was. I can only think of a cold joint or loose connector.

[nostrike]

Re: Myrica p42-2H green shadows

Will try to take out the power supply and look under the print. I worked before I pulled it out and tested the resistors.

[nostrike]

Re: Myrica p42-2H green shadows

It is weird. Still not working. Maybe Y-sustain or Y-buffer is just burned out. It is a very old TV and have read on the net that these Samsung Y-buffer burn out easy.

The Power supply was unstable with Y-sustain connected and know it is stable with it connected, so the Y-sustain is not pulling any power.

The Z-sustain is also getting warmer,
but Y-sustain is cold, so I think it does not get power
through it. (error on Y-sustain).

[tom66]

Re: Myrica p42-2H green shadows

Does this TV use two buffers? If it does, try it without the top buffer. Then, try it without the bottom one.

[nostrike]

Re: Myrica p42-2H green shadows

Will try that.

[nostrike]

Re: Myrica p42-2H green shadows

Did not help. I think my Y-sustain is damaged/dead.
It is a Samsung LJ92-01200A if that helps.

[tom66]

Re: Myrica p42-2H green shadows

Under the large metal heatsink on both sustains there is a "Hybrid" IPM module.

Can you remove the board and take a picture of the underside of this module? (the pins.)

[nostrike]

Re: Myrica p42-2H green shadows

Of course, give me 5-10 minutes

[nostrike]

Re: Myrica p42-2H green shadows

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