[mikklejickles]

Same for TVP Chip

RED – 3.3v
YELLOW – 1.9v
LIGHT BLUE – 0.6v
BLUE – 0.1v to 0.49v
GREY – GND or 0v
RED BOX – Other voltages 1.6 to 3.24v
BLUE BOX – Very low voltage (< 0.1v)

[mikklejickles]

Video assembly series is a good idea. I have a full video set of an assembly but have not gotten around to editing it.

I also have a build log for my current build which has some detail by not all of what you are suggesting.

I would be happy to work on the “short” guide with you if you use google docs. I think I may have created and found more shorts than anyone in the short history of OSSC diy 🙂

[mikklejickles]

Hi folks,

Here are the pinout voltages of my FPGA for reference when it is switched on (Red LED off, Green On).

If anything looks blatantly off here let me know (for those that are that deep in this that they know these values!)

RED – 3.3v
YELLOW – 1.2v
LIGHT BLUE – 0.6v
BLUE – 0.1v to 0.4v
GREY – GND or 0v
RED BOX – Other voltages 1.5 to 3.27v
BLUE BOX – Very low voltage (< 0.1v)

[mikklejickles]

Checked PCLK and looks like I have very low voltage signal maybe .02v and there is a pattern on the scope. I measured voltages on every other FPGA pin and they look ok no bridges.

If PCLK at low voltage is wrong that may be my problem.

[mikklejickles]

I will check pclk signal today. Thanks for input marqs!

[mikklejickles]

All ground plates are soldered for sure.

Does the test pattern rely on the TVP (where is that actually generated – i think it might be the ITE chip but I’m not sure!)?

My guess is that the TVP needs to work in order to get the Red ‘Sync’ led to go out (as it is then sync’d and locked to 59.59Hz on some input).

Because both the test pattern AND the sync’d input from scart are not outputting anything, I’m guessing it’s something downstream of the inputs.

[mikklejickles]

Update : I bought a HDMI to VGA converter to see if I could see anything – as my HDMI tester says everything about the signal is good connectivity wise and voltages on all pins for HDMI are about 2.7v.

Again no signal on PC input.

At this point I wonder if I could jump the VSYNC, HSYNC signals directly to a VGA cable and see if I can get anything.

[mikklejickles]

Hey friend, welcome to the forums!

So I own a DSO Quad and I like it for a lot of the OSSC work.

One problem – HDMI – it is VERY high bandwidth and speed. Testing HDMI signals properly usually requires GHz oscilloscopes and test equipment can run literally into the hundreds of thousands of dollars. Software installed on these kinds of oscilloscopes costs thousands to do HDMI compatibility testing. You do not NEED this but In the event you need to test the HDMI signals beyond basic connectivity tests.

A TMDS pair signal sends about around 2.7-3v on each line so you can test those with a multimeter.

The DSO quad works up to 8Khz and can test most basic signals (for instance I can easily
test HSync, Clock and VSync on my OSSC).

For true HDMI or DVI (anything TMDS) debugging you need some serious equipment – if you are lucky you will never need this but I got I to some trouble with my OSSC with HDMI and a basic oscilloscope won’t realy help you here (at least with the knowledge I have!)

I got a DSO quad on EBay for around 100 bucks.

[mikklejickles]

Nope. Not the power supply. Tried a different one rated 2A.

Weird. From all diagnostics, LEDs, HDMI testers and debug outputs it *should* be working but isnt….

Would love some input from marqs if he had any ideas.

[mikklejickles]

I wonder if it’s the power supply. That’s the one thing I’ve not tried switching. Its rated 1.5A at 5v and should work but you never know.

[mikklejickles]

Sorry I was referring to them backwards. So the green led was dead I just checked the pin and it’s now outputting 3.3v, i must have fixed the short, I replaced the led and now I have green and red leds working.

Still no output on HDMI but it’s basically doing what it’s supposed to do from every other perspective. My HDMI tester shows perfect connectivity on Channel 0,1,2 and clock. It’s like no data is going to the HDMI from the FPGA.

I’ll try it out on some other TVs.

[mikklejickles]

Hey Morpheus,

Thanks for the reply. In terms of what ‘should’ be coming out of the LED0 pin, what voltage should that be?

I thought that maybe it was because of a bad solder on the IR transmitter, but I wasn’t sure until I removed it altogether. Still don’t get a green LED.

If I were to try one last time, it would probably be to replace the entire FPGA, but it is strange how all of the firmware code seems to run ok on it, which is why I didn’t start there. I’ve checked for bridges with a multi-meter on all chips, all pins. They’re good. Also checked that all legs were soldered in.

[mikklejickles]

I’m out of ideas folks. Checked the above signals with a scope and they are similar.

Changed out the HDMI chip – doesn’t seem to make a difference. Exact same problem. I connected a HDMI Tester and everything shows normal with the HDMI signal. (5 orange lights for RX, 3 green lights for data, Red for HPD and Green for CEC). That tester only does basic continuty, but at least it shows the connection is good.

On several TV’s and monitors, “No Signal”, and No test pattern.
I also connected a HDMI to DVI cable to a monitor with DVI-In – “No Signal”, and No test pattern.

With a Neo-Geo connected – on AV1 i get

AVI: RGBS 264p
15.73kHz 59.59Hz

I’m giving up.

Here is my debug log in case it helps the next person.

Sync LPF value set to 0x0
Flash size in bytes: 8388608
Sector size: 65536 (256 pages)
Page size: 256
RC data read (54 bytes)
No userdata found on entry 0
SetInputMode(00,00)
Input mode is RGB24
Output mode is RGB24
SetupAFE()
Reg[61] = 00
Reg[62] = 18
Reg[63] = 10
Reg[64] = 0C
Reg[65] = F0
Reg[66] = 00
Reg[67] = 3F
HDMITX_SetAVIInfoFrame: VIC=0, Aspect-Ratio=4:3, ITU709=No, ITC=No, pixelrep=0
SetAVIInfo():
### DIY VIDEO DIGITIZER / SCANCONVERTER INIT OK ###

On switching inputs

BCODE: 0x01
### SWITCH MODE TO AV1: RGBS ###
THS source set to 1
SOG detected

Sync up in 3...
totlines: 264 (cur) / 0 (prev), clkcnt: 1716 (cur) / 0 (prev). totlines_tvp: 1, VSM: 0
Horizontal samplerate set to 0
Estimated PCLK_HPLL: 0.000 MHz
VCO range: Ultra low
CPC: 7
Sync up in 2...
Sync up in 1...
Sync up in 0...
Sync up

Lines: 264 p
Clocks per line: 1716 : HS 15.734 kHz  VS 59.59 Hz
Hswidth: 129  Vswidth: 8  Macrovision: 0
Mode 240p selected - hsync width: 129px
Horizontal samplerate set to 3432
Estimated PCLK_HPLL: 53.999 MHz
VCO range: Low
CPC: 1
PCLK_in: 13499772Hz
TVP LPF value set to 0x0
THS LPF value set to 0x0
Phase selection: 2/2 (FPGA), 1/32 (TVP)
h_border: 0, h_opt_startoffs: 0
HDMITX_SetAVIInfoFrame: VIC=0, Aspect-Ratio=4:3, ITU709=No, ITC=No, pixelrep=0
SetAVIInfo():
SetInputMode(00,00)
Input mode is RGB24
Output mode is RGB24
SetupAFE()
Reg[61] = 00
Reg[62] = 18
Reg[63] = 10
Reg[64] = 0C
Reg[65] = F0
Reg[66] = 00
Reg[67] = 3F
HDMITX_SetAVIInfoFrame: VIC=0, Aspect-Ratio=4:3, ITU709=No, ITC=No, pixelrep=0
SetAVIInfo():

[mikklejickles]

Ok – I created a loop on “HDMITX_DevLoopProc” which i believe is a diagnostics function. I created a debug build and flashed it to the chip (had to disable the setup_rc() function for it to fit in memory).

Gave me the following output, it definitely detects the display after a connection, i think its down to the sending of a bad voltage on one of the pins of the twisted pairs causing the display to reject the signal. I’m going to replace the IT6613 and see what happens.

HDMITX_DevLoopProc
sysstat(REG[0x0E])=4Eh

HDMITX_DevLoopProc
sysstat(REG[0x0E])=6Eh

HPDChange
HPD=ON
ReadEDID(): ReqCount = 32,bCurrOffset = 0
ReadEDID(): ReqCount = 32,bCurrOffset = 32
ReadEDID(): ReqCount = 32,bCurrOffset = 64
ReadEDID(): ReqCount = 32,bCurrOffset = 96
ReadEDID(): ReqCount = 32,bCurrOffset = 128
ReadEDID(): ReqCount = 32,bCurrOffset = 160
ReadEDID(): ReqCount = 32,bCurrOffset = 192
ReadEDID(): ReqCount = 32,bCurrOffset = 224
Support Color: YUV444
Support Color: YUV422
[00] 02 03 26 71 49 90 01 02 - 03 04 05 06 07 20 26 09
[10] 07 07 11 07 18 83 01 00 - 00 6C 03 0C 00 20 00 00
[20] 21 C0 15 15 1F 1F 01 1D - 80 18 71 1C 16 20 58 2C
[30] 25 00 40 84 63 00 00 9E - 01 1D 00 72 51 D0 1E 20
[40] 6E 28 55 00 40 84 63 00 - 00 1E 8C 0A D0 8A 20 E0
[50] 2D 10 10 3E 96 00 B0 84 - 43 00 00 18 8C 0A A0 14
[60] 51 F0 16 00 26 7C 43 00 - B0 84 43 00 00 98 00 00
[70] 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 3F
HDMI Sink VIC(Video Identify Code)=16
HDMI Sink VIC(Video Identify Code)=1
HDMI Sink VIC(Video Identify Code)=2
HDMI Sink VIC(Video Identify Code)=3
HDMI Sink VIC(Video Identify Code)=4
HDMI Sink VIC(Video Identify Code)=5
HDMI Sink VIC(Video Identify Code)=6
HDMI Sink VIC(Video Identify Code)=7
HDMI Sink VIC(Video Identify Code)=32
HDMI Display found
HDMITX_SetOutput
HDMITX_DevLoopProc
sysstat(REG[0x0E])=6Eh

[mikklejickles]

Ok so I checked the voltages on each TMDS pair out at the chip pins. This is with the cable plugged in to a tv in order to show a load.

Tx2p 2.69v
Tx2m 0.2v
Tx1p 2.64v
Tx1m 3.19v
Tx0p 2.64v
Tx0m 3.2v

Tx2m (channel 2 negative) is not showing the correct voltage as far as I can tell. It should be in the 2-3v range according to some datasheets I read about hdmi.

Maybe the it6613 chip is bad?

Reference for HDMI voltages

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