Testing this buffer board

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Hi

I have got a plasma that has blown 4 fets on the Y sus (Pictured) everything else seems ok.

Its the buffer that is worrying me, normally you can see pit marks in the IC's and know if they are blown, how do you check the ones pictured, or do you advise just changing the buffer board

Thanks in advance

[ben7]

Re: Testing this buffer board

Hi

I have got a plasma that has blown 4 fets on the Y sus (Pictured) everything else seems ok.

Its the buffer that is worrying me, normally you can see pit marks in the IC's and know if they are blown, how do you check the ones pictured, or do you advise just changing the buffer board

Thanks in advance

I'm assuming 'the buffer' is the y-buffer?

How did the MOSFETs blow? Short circuit gate-drain?
My guess is, yes, the buffer boards should be replaced. Chips can short circuit without melting or burning. But yeah, I'm no expert...

Another user on here, tom66, knows a lot about plasma displays, he will be able to help you for sure

-Ben

[signup]

Re: Testing this buffer board

Yes your assumption is correct, this is the y buffer, the mosfets were S/C'd

Is it always the case when the fets blow it takes out the IC's on the buffer, and what will happen if I put a new Ysus in and the board is blown will it take out the new y sus board??

Thanks again

[martyparish]

Re: Testing this buffer board

I believe you just need to find the ground pin on each of the ribbon connectors and then take your meter and run it slowly down each side of the connector to check for shorts. Check Tom66's messages, somewhere he posted a video on it.

[martyparish]

Re: Testing this buffer board

Here's that vid:

http://www.youtube.com/watch?v=51SZsfH60EY

[signup]

Re: Testing this buffer board

Thank you so much will have a go now


Is that your own video Tom?

[signup]

Re: Testing this buffer board

Just one question,

It says I need to find the sustain output on the buffer board

The only connection plug I have is labelled

1. GND
2. 5v
3. GND
4. OC1
5. OC2
6. Data
7. LE
8. GND
9. CLK
10. GND

Which pin am I aiming for

[martyparish]

Re: Testing this buffer board

I'm pretty sure you want to use ground. Here's another pretty good demonstration:

http://www.youtube.com/watch?v=5hVi5gd0aec

[tom66]

Re: Testing this buffer board

Thank you so much will have a go now


Is that your own video Tom?

Yes, my video.

The buffer chips are under the heatsinks.

[signup]

Re: Testing this buffer board

Cheers Tom, got the IC's just wanted to know which pin out I needed to use, the buffer has got no continuity through any of the flat cable connections.

Tom Thank you it must be a first that I have seen a proper tutorial that explains more in laymans terms, will have a look through a few of your others later..Brilliant

Can I just ask a stupid question whilst your here, I couldnt be arsed to go and get a new battery for my DMM so I used my AMM for the continuity checks, when I tested it showed continuity through every single terminal on each of the connectors...Why?

I was forced to get a new battery and no shorts anywhere