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Reverse engineering Tektronix TDS3GV module for TDS3000 series oscilloscopes?
stas_last:
slightly modified for esp32. Now works on web sockets. made a save button.
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YuukiJapanTech:
Hi.
I have the TDS3GM, which has no VGA output compared to the TDS3GV, but the other features are similar.
I disconnected the connector to check the pattern of the logic IC.
All patterns from the connector to the logic IC are visualized, so please refer to them.
TDS3GM was also a 4-layer board, but when it was transmitted by a very strong light, the second and third layers had only VCC and GND.
I also wrote pin assignments on the photos I analyzed for VGA, etc. Thank you for the analysis!
I think the VGA DA converter IC use ADV7120, can probably other use BU3616K.
I would like to complete a board that fully supports TDS3GV someday, so I'll do my best to analyze it...
pschirrer:
Hello,
I have a TDS3014 and just connected the Serial cable using a USB FTDI TTL to USB adapter, like described earlier in this post.
The scope is receiving the characters I type (checked using the debug feature of the RS232 menu). The scope is sending data when performing a screen dump through RS232, but it is not responding to commands sent to the RS232 port (*IDN? command for example). I can see it received it (debug menu), there is no error reported, but no characters are sent (0 sent in the debug menu).
Anybody know what is happening ? How can I get the scope accept commands ? I would like to offload the channel data to do some post analysis.
Thanks.
pmercier:
You will have to downgrade your firmware to 3.39. With the newest version I don't get an answer too event if the debug see the communication (except for the print screen).
pmercier:
@YuukiJapanTech Here what i have reversed from reverse engineering the schematic from different photos (maching yours too)
Screen
2 DotClk (25Mhz)
3 HSync (31.5KHz)
4 VSync (60Hz)
6, 7, 8, 9 Red
51, 52, 54, 55 Green
56, 57, 59, 60 Blue
Ethernet (SNI)
15 Tx
16 Rx
17 TENA
18 CLSN
19 RENA
20 TCLK
22 RCLK
Adrs
37 A11
39 A10
40 A9
41 A8
42 A7
43 A6
44 A5
46 A4
47 A3
48 A2
49 A1
50 A0
Data
82 D0
83 D1
84 D2
85 D3
87 D4
88 D5
89 D6
90 D7
92 D15
93 D14
94 D13
95 D12
97 D11
98 D10
99 D9
100 D8
Ctrl
22 /INT
24 CARD_INSERTED (5K to ground for 3GM)
81 R/W
Power
12 3v3
72 5v
Grounds 1, 5, 10, 21, 32, 38, 45, 53, 58, 67, 80, 86, 91 and 96
Serial (from james_s) :
68 TxD
69 RxD
70 RTS
71 CTS
They are the ones i have written in my notebook, but i've more on the reverse schematic (don't remember the one i reversed). I'll have access to it once am back to home tonight.
Edit:
D0 to D7 was flipped, they now have the good pinout
I've 8 more pins, but as i still haven't finished the reverse, i don't know was they are exactly. They are control signals for the card, but don't know for the moment what they are doing.
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