Main > Monitor/Video Forum
looking for Wells Gardner D9400 ic702 EEPROM data
lilshawn:
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.
yatzr:
--- Quote from: lilshawn on November 19, 2020, 11:13:57 am ---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.
--- End quote ---
That is some great info and gives me another avenue to explore. I really appreciate that you highlighted it on the schematic. Thanks!
lilshawn:
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.
yatzr:
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
lilshawn:
:cheers: