Build Your Own Arcade Controls Forum
Main => Monitor/Video Forum => Topic started by: yatzr on November 18, 2020, 11:47:42 pm
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I have a WG D9400 that shows no red from a game signal, but shows it fine on the OSD. Lots of searching suggests my IC702 eeprom has gone corrupt, so I got a replacement chip. Then I found out the D9400 won't initialize the eeprom with default values, so I need to program it first. Does anyone know where I can find a good data file to write to this eeprom? Or does anyone have a good working D9400 that they'd be willing to pull the data off of?
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have you accessed the factory menu and set the levels in the rgb extended menu?
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Yes, I was able to access the factory menu by holding OSD and Key+ when powering on the monitor. I was able to adjust the rgb settings, but it had no effect on getting red to show up for the game signal.
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could be something to do with the interface board
you tried a different signal source i imagine?
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Yep, I've tried different sources and tried those sources on a different monitor to verify that they're outputting all colors just fine.
It certainly could be something with the interface board, but all my searching so far leads me to believe this is a common problem with the eeprom getting corrupted so I wanted to try that out first. Only problem is I can't find valid data to write to this blank eeprom :'(
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The D9400 video amp IC on the neckboard has separate RGB inputs just for the OSD completely seperate to the RGB that is used for the video... so you'll find the OSD displays just fine, but the video input is missing a color. i've found it quite common for the inputs to get zapped by static and go dead due to the videocable basically being conected directly into the IC inputs with hardly any static protection but a couple capacitors.
chip is LM1269 or LM1267 either part is fine.
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The D9400 video amp IC on the neckboard has separate RGB inputs just for the OSD completely seperate to the RGB that is used for the video... so you'll find the OSD displays just fine, but the video input is missing a color. i've found it quite common for the inputs to get zapped by static and go dead due to the videocable basically being conected directly into the IC inputs with hardly any static protection but a couple capacitors.
chip is LM1269 or LM1267 either part is fine.
That is some great info and gives me another avenue to explore. I really appreciate that you highlighted it on the schematic. Thanks!
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no problem. I've replaced quite a few that have done this... so much so, that i keep tubes of them handy and buy them in 5 and 10 packs...
the LM1269's and the LM1203's are bad for this...sometimes LM2421's
the LM1203's mainly cause the output transistors short and feed high voltage back into the chip and kill the output so if i'm replacing a shorted color drive transistor i don't even bother testing if it's just that, i do the chip too.
the 1269 used in the WG monitors is kinda a bad design i think having a user manipulated device go straight into an input without any kind of protection is asking for trouble. pull the plug and short the pins on the shield ground on the way out (or on the way in), and who knows.
in any case, I think that is going to be your most likely avenue of issue.
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lilshawn, you nailed it. I got my replacement LM1269, swapped it in, and now I get a perfect picture. I can't thank you enough! Now I just gotta figure out how to reduce the 15khz whine.
In case anyone ever does need the eeprom data, here is mine which I now assume is perfectly fine. Formatted like this cause I was only able to read/write 16 bytes at a time
word address: data
00: A7 0A 3A 55 28 3F 34 44 00 00 89 48 4A 57 2D 51
10: 3F 43 00 00 B3 33 37 53 2C 3A 48 48 00 00 71 3A
20: 49 55 2F 4C 31 43 00 00 95 26 36 55 28 3A 48 4A
30: 00 00 83 2F 46 7F 2B 4F 31 43 00 00 96 27 38 5C
40: 29 3B 48 4C 00 00 78 32 47 56 2C 4F 31 43 00 00
50: 8D 48 34 4A 28 36 49 4A 00 00 50 66 48 22 28 42
60: 3F 3F 00 00 90 8D 52 38 02 44 3F 47 00 00 6F 84
70: 4A 2C 07 40 40 40 00 00 6E 88 4B 27 07 40 40 40
80: 00 00 99 8D 35 3A 05 43 40 40 00 00 7C 7A 49 1E
90: 03 40 40 40 00 00 84 84 49 7F 0A 40 40 40 00 00
A0: 80 80 40 40 40 40 40 40 40 40 80 80 40 40 40 40
B0: 40 40 40 40 A7 0A 3A 55 28 3F 34 44 00 00 89 48
C0: 4A 57 2D 51 3F 43 00 00 B3 33 37 53 2C 3A 48 48
D0: 00 00 71 3A 49 55 2F 4C 31 43 00 00 95 26 36 55
E0: 28 3A 48 4A 00 00 83 2F 46 7F 2B 4F 31 43 00 00
F0: 96 27 38 5C 29 3B 48 4C 00 00 78 32 47 56 2C 4F
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:cheers: