ossc hot during use

[ludovictor]

Hi every one,

I have an OSSC since 2 years I think but I use it now every time. WHen I use it and I touch below the OSSC, I find it very hot. I don’t know if it’s normal. Electronics stuff should not be hot like this and I’m thinking to use a fan to dissipate heat.
.
What do you think ? I check the voltage of my PSU and it’s 5,14V so it’s ok so the problem is not that.

Thank you

[BuckoA51]

The FPGA can get a little warm, that’s normal, exactly how hot is very hot? Hot like you’d warm your feet on it on a winters day or so hot you can’t touch for more than a second?

[ludovictor]

Less than I can’t touch for more than a second (because I can keep my hand on the bottom panel), but more than just to warm my feet. So I imagine that the FPGA is more and more warm than the panel. I understand that electronics warm when you use it, but warm like that without heatsink is it not strange ?

[ludovictor]

And when it’s too warm, there is short cut of the ossc (like it lose the signal for few second). Any idea ?

[marqs]

The FPGA shouldn’t get too warm, but the digitizer chip can get relatively hot depending on which mode you are using. That’s why it has a heatsink on top of it. I’d first disassemble the case and ensure that it’s the digitizer on your board that’s generating heat, and then make sure the heatsink is properly attached.

[ludovictor]

I disassemble the top case to see each component. Yes the digitizer chip is really hot. When I touch the heatsink I can’t let my finger too long. The component used to convert in hdmi (near the hdmi port) is hot as well but less than the digitizer. And finally the FPGA is hot but less than the component near the hdmi and less than the digitizer.
But I find each component hot and not just warm. I take a look on the top and bottom of the PCB but I don’t see anything strange. Do you want picture of my PCB ?
What can I try ? I have a multimeter to measure some point

[ludovictor]

I measure output voltage for each regulator and they should be ok : I measure voltage close to 3,3V or 1,8V or 1,2V. So I don’t think the problem is a to high voltage.
Edit : and the fpga, the digitizer and the the hdmi component are hot without input or output video. Just the power supply
What can I try ? measure ? Or should I send it to you to take a look or repair it ?

[BuckoA51]

If it’s cutting out then yes sounds like you may have a fault. IF you ordered from us, e-mail in with your order number and I can check warranty status.

[ludovictor]

Yes it’s cutting after 3/4 hours of used. Like very short cut and components are hot

[marqs]

Edit : and the fpga, the digitizer and the the hdmi component are hot without input or output video. Just the power supply

That’s a bit confusing, do you mean only power supply gets warm/hot with no other devices connected? What’s the ambient temperature in your environment and which input and line multiplication mode you used when it cut out?

[ludovictor]

I mean I just supply the ossc, it is turn on and no scart, no component no vga input are connected to the OSSC and the output is not connected. It is just working alone without input and output connected. And just like that, so no traitement, U1 U2 and U3 are hot and getting hotter by the time goes.
And when I use it (and he becomes hot too) the input is the scart for a PAL gamecube with the setting for the gameboy player gbihf+ossc+cli so the 384p with lineX2 or X3 I don’t remember.
The OSSC is on a table with nothing around it and the ambient temperature is ~26°C.

Sorry for my bad english

[marqs]

Sounds like some component/connection is leaking current to ground, causing the gnd plane to get gradually warmer. That way regulators and digitizer (that normally get somewhat warm) can become hot over time even without a significant load. You should RMA the board.

[ludovictor]

Ok I send an email to videogameperfection. I feel stupid to don’t use it the first year to discovered that it had this problem …

Thank you marqs for your help and your work

[ludovictor]

Because I don’t use the PSU that you sell, I measure the current comsuption : it is 400mA when there is no input/output connected and 670mA when the scart is connected with the setting for the gameboy player. So my PSU is ok (it doesn’t delivered too much current).
What kind of test can I do ?

[marqs]

Those numbers sound OK, so assuming there is no overvoltage, the power consumption (and thus heat dissipation) of the board should be on normal range.

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