Identify fault on Orion TV2700HDV

[Jon Templeman]

Hello Guys,
Can anyone identify this fault on an orion TV I have been given please?

The picture shows fine for 30 minutes to an hour then the fault kicks in (Please see youtube links below)

TIA

Jon

Fault - Tai chi VHS into fault
http://www.youtube.com/watch?v=hlOgZxUvUNc

Fault - Fault no signal then fault with video signal
http://www.youtube.com/watch?v=E84_fNwgjMY

[tom66]

Re: Identify fault on Orion TV2700HDV

The clicking sound - is that produced when the fault occurs?

[1beertap]

Re: Identify fault on Orion TV2700HDV

It looks typical of a failing or bad t-con board. Does the tv have sound during fault?

[Jon Templeman]

Re: Identify fault on Orion TV2700HDV

The clicking sound - is that produced when the fault occurs?

It looks typical of a failing or bad t-con board. Does the tv have sound during fault?

Hi guys, thanks for your replies.

I will turn the TV on tonight, find out and post the answers to your questions

Best Regards,

Jon

[Jon Templeman]

Re: Identify fault on Orion TV2700HDV

The clicking sound - is that produced when the fault occurs?

There seems to be a clicking sound during the fault, please have a look at the youtube link

It looks typical of a failing or bad t-con board. Does the tv have sound during fault?

Yes the TV has sound during the fault, again please have a look at the youtube link.

http://www.youtube.com/watch?v=G3iWHTMawkU

[tom66]

Re: Identify fault on Orion TV2700HDV

There seems to be a clicking sound during the fault, please have a look at the youtube link

Yes I heard that and I wasn't sure if you were turning something on/off during the test, but if the TV makes the clicking sound, have you identified where the clicking comes from? Is it a relay on the power supply, or main board? From the speakers? That is probably a clue that some power supply rail is going bad.

There are a number of potential faults that cause this. What is happening is that somewhere between the video processor and the display something goes wrong. It could be the Tcon, it could be the video processor itself.

I've seen this fault occur when the main board power supply goes south. Usually there's a little SMPS buck converter which provides a core voltage like 1.8V or 3.3V to the CPU. (There may be more, depending on design.) Also, the Tcon usually gets power from the main board, or sometimes the power supply. Check that the Tcon voltages remain stable before and during the fault condition.

Perhaps the clicking sound is caused by the power to the sound processor, or audio amplifier, going bad briefly - this could upset the Tcon too.

Do you have a scope?

[Jon Templeman]

Re: Identify fault on Orion TV2700HDV

Yes I heard that and I wasn't sure if you were turning something on/off during the test, but if the TV makes the clicking sound, have you identified where the clicking comes from? Is it a relay on the power supply, or main board? From the speakers? That is probably a clue that some power supply rail is going bad.

There are a number of potential faults that cause this. What is happening is that somewhere between the video processor and the display something goes wrong. It could be the Tcon, it could be the video processor itself.

I've seen this fault occur when the main board power supply goes south. Usually there's a little SMPS buck converter which provides a core voltage like 1.8V or 3.3V to the CPU. (There may be more, depending on design.) Also, the Tcon usually gets power from the main board, or sometimes the power supply. Check that the Tcon voltages remain stable before and during the fault condition.

Perhaps the clicking sound is caused by the power to the sound processor, or audio amplifier, going bad briefly - this could upset the Tcon too.

Do you have a scope?

Thanks Tom, I will check the power supply, and no, I don't have a scope.