[krivx]

So… the Vishay TSOP4838 IR receiver does work with the OSSC if you bend a couple of legs over. It’s cheap and available everywhere, it will do for now.

With menu access I can now switch output mode from HDMI to DVI and I get the test pattern on my monitor. My SNES also works well but has some periodic noise that isn’t in the test card image, I’m guessing that’s from the cheap switching power supply.

I’m pretty happy, thanks for the help.

[krivx]

I think it’s more likely that the first monitor I tried is too old to be HDMI compliant. I was connecting with a HDMI->DVI-D cable. I’m curious if it will support higher resolutions or if it’s completely unsuitable. Currently waiting on some TO-92 IR receivers to add to try out while I wait for specified part.

[krivx]

I tried it briefly on a friend’s monitor – 720×480 60Hz grey gradients/checkerboard 🙂 My monitor must not support this resolution. Looks like the problem all along was that the board needed re-programming.

[krivx]

Thanks for the help. I have a feeling my monitor could be part of the issue, it does switch to the digital input when power is applied to the OSSC and it doesn’t go into standby after a few minutes. It just doesn’t show an image, just a black screen and the OSD is not responsive. What would the resolution of the test image be?

I would like to try another monitor before getting a replacement IT6613. The soldering looks good under high magnification. I have tried with the HDMI ESD diodes removed but with no change.

[krivx]

OK – some good progress. I downloaded an older version of Quartus Programmer (linked here http://www.firebrandx.com/nespalette.html) and installed it, along with older USB Blaster drivers that were included. My clone does work with these drivers. I was able to successfully detect the FPGA and program the latest 0.78 FW. After disconnecting JTAG and power cycling, my LCD now shows an OSSC FW version message!

I don’t really understand why programming was necessary, unless the pre-programmed IC that came with the kit had invalid FW?

Unfortunately, I get no test pattern on the HDMI output – but I have only tested with one monitor. If I connect a SNES over SCART the OSSC can detect and sync to it correctly, but still no output image.

Without an IR receiver all I can do with the unit is change sources, I have no access to menus so I don’t know if some option needs to be changed.

[krivx]

Yes, the centre pads are soldered. I tinned the pads lightly and added flux, then placed the chips, then hot air, then soldered the pins.

I just tried putting together a Quartus install to see if it can communicate with the FPGA and the Win10 USB Blaster drivers cause repeat BSOD when using some clone USB Blasters 🙁 I’ve ordered another cheap clone.

I have a spare FPGA (same Asian vendor) and I’m OK at replacing QFPs so that may be the last resort…

[krivx]

I’ll take another look under higher magnification, I think a reflowing/resoldering would catch a bridge like that though. Thanks.

Do you know if something as simple as a missing PCM1862 crystal or IR receiver would cause this?

[krivx]

A binary compare of my dumped image and the files at https://www.niksula.hut.fi/~mhiienka/ossc/fw/ show that there is a 512 byte header added. Looks like U10 has valid data, just not the most up to date version.

[krivx]

Taking another look at the U10 dump – it doesn’t look right:

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
00000010  FF FF FF FF FF FF 7F FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿ.ÿÿÿÿÿÿÿÿÿ
00000020  56 EF EF EF EF EF EF CF DF CF 9F 5F 1F 8F 1F 1F  VïïïïïïÏßÏŸ_....
00000030  3F 3F 3F 5F BF 5F 1F 9F DF DF 7F DF 9F BF BF BF  ???_¿_.Ÿßß.ߟ¿¿¿
00000040  1F 3F 3F 3F 3F 1F 1F 5F 5F B8 1C FF FF FF FF FF  .????..__¸.ÿÿÿÿÿ
00000050  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
00000060  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
00000070  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
00000080  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
00000090  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
000000A0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
000000B0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
000000C0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
000000D0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
000000E0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
000000F0  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
00000100  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
00000110  FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00  ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ.
00000120  00 00 00 04 04 04 04 04 04 04 04 04 04 04 04 04  ................
00000130  04 04 04 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000140  00 00 00 04 04 04 04 04 04 04 04 04 04 04 04 04  ................
00000150  04 04 04 04 04 04 04 00 00 00 00 00 00 00 00 00  ................
00000160  00 00 00 00 00 00 00 04 04 04 04 04 04 04 04 04  ................
00000170  04 04 04 04 04 04 04 04 04 04 04 00 00 00 00 00  ................
00000180  00 00 00 00 00 00 00 00 00 00 00 04 04 04 04 04  ................
00000190  04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 00  ................
000001A0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04  ................
000001B0  04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04  ................
000001C0  04 04 04 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000001D0  00 00 00 04 04 04 04 04 04 04 04 04 04 04 04 04  ................
000001E0  04 04 04 04 04 04 04 00 00 00 00 00 00 00 00 00  ................
000001F0  00 00 00 00 00 00 00 04 04 04 04 04 04 04 04 04  ................
00000200  04 04 04 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000210  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04  ................
00000220  04 04 04 04 04 04 04 00 00 00 00 00 00 00 00 00  ................
00000230  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000240  00 00 00 04 04 04 04 04 04 04 04 04 04 04 04 00  ................
00000250  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000260  00 00 00 04 04 04 04 00 00 00 00 00 00 00 00 00  ................
00000270  00 00 00 04 04 04 04 00 00 00 00 00 00 00 00 00  ................
00000280  00 00 00 00 00 00 00 00 00 00 00 04 04 04 04 04  ................
00000290  04 04 04 04 04 04 04 04 04 04 04 00 00 00 00 00  ................
000002A0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04  ................
000002B0  04 04 04 04 04 04 04 04 04 04 04 04 04 04 04     ...............

Is there a file available I can use to program this chip? I assume the SD card update file is similar but has some kind of header applied to it?

[krivx]

I haven’t put together a toolchain yet but this is what I am expecting: https://www.altera.com/support/support-resources/knowledge-base/solutions/rd09142004_1190.html

[krivx]

NCP703SN18T1G is in stock locally. Thanks very much 🙂

[krivx]

I guess I will be rigging up an LM317 instead…

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