# LG290P broken TX direction **URL:** \ **Category:** GPS/GNSS\ **Created:** [May 4, 2026, 5:42pm UTC](https://community.sparkfun.com/t/lg290p-broken-tx-direction/68690 "2026-05-04T17:42:46Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Kaylyn\_Shibata](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/kaylyn_shibata/32/12556_2.png) [@Kaylyn\_Shibata](https://community.sparkfun.com/u/Kaylyn_Shibata)\ **Post date:** [May 4, 2026, 5:42pm UTC](https://community.sparkfun.com/t/lg290p-broken-tx-direction/68690/1 "2026-05-04T17:42:46Z")
TX direction (host → module) is broken on both paths (GPIO and USB). RX (module → host) works only on the GPIO path. I’ve tried swapping out wires and retesting the connections but still cannot get this to work. Anyt thoughts? ---
**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\ **Post date:** [May 4, 2026, 5:52pm UTC](https://community.sparkfun.com/t/lg290p-broken-tx-direction/68690/2 "2026-05-04T17:52:17Z")
Share a couple photos of the issue…is it physically damaged? Are you using [this model?](https://docs.sparkfun.com/SparkFun_LG290P_Quadband_GNSS_RTK_Breakout/hardware_overview/#uart1) ---
**Author:** ![Kaylyn\_Shibata](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/kaylyn_shibata/32/12556_2.png) [@Kaylyn\_Shibata](https://community.sparkfun.com/u/Kaylyn_Shibata)\ **Post date:** [May 4, 2026, 6:16pm UTC](https://community.sparkfun.com/t/lg290p-broken-tx-direction/68690/3 "2026-05-04T18:16:26Z")
thanks your your help! yes i am using that model . This is what i purchased: [https://www.digikey.com/en/products/detail/sparkfun-electronics/GPS-28929/26769964](https://www.digikey.com/en/products/detail/sparkfun-electronics/GPS-28929/26769964) there is no physical damage: [photo](https://drive.google.com/file/d/1cq8cjtO8p-97aweTDfdF3g8pstL4HrAW/view?usp=sharing) I am attempting to wire it up to my Jetson Orin Nano. There seems to be no data transferring over usb and since i cannot mate it to the Jetson I am using jumpers to wire and 8 and 10 pins for TX and RX respectively. Ideally we can just have this transfer through USB ? ---
**Author:** ![sparky](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/sparky/32/6021_2.png) [@sparky](https://community.sparkfun.com/u/sparky)\ **Post date:** [May 4, 2026, 8:06pm UTC](https://community.sparkfun.com/t/lg290p-broken-tx-direction/68690/4 "2026-05-04T20:06:44Z")
The USB connector on the pHAT is designed for GNSS modules that have USB built-in (such as the mosaic-X5 or ZED-F9P). The LG290P does not. The pHAT is designed to connect the GNSS UART directly to the RasPi. You can open a terminal and talk to the LG290P over serial directly, no need for USB connection. If you need to have a direct USB connection to the LG290P I suggest the [breakout board](https://www.sparkfun.com/sparkfun-quadband-gnss-rtk-breakout-lg290p-qwiic.html). ---
**Author:** ![bamarcant](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/bamarcant/32/9152_2.png) [@bamarcant](https://community.sparkfun.com/u/bamarcant)\ **Post date:** [May 4, 2026, 8:10pm UTC](https://community.sparkfun.com/t/lg290p-broken-tx-direction/68690/5 "2026-05-04T20:10:13Z")
_You own the flex for phat and is different…_ I (me), --need to know the jumpers pads usage-- can the board be used as is? > **[schematic.pdf](https://docs.sparkfun.com/SparkFun_GNSS_Flex_System/SparkFun_GNSS_Flex_pHAT/assets/board_files/schematic.pdf)** > > 123.96 KB ![immagine](https://canada1.discourse-cdn.com/sparkfun/original/2X/3/3ebacf2d6d79b923e369714a3d0adca942fd9172.png) need to open the pad? Thanks ---
**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\ **Post date:** [May 4, 2026, 8:21pm UTC](https://community.sparkfun.com/t/lg290p-broken-tx-direction/68690/6 "2026-05-04T20:21:56Z")
@bamarcant It works as-is. The [GPIO jumper pads on the Flex](https://docs.sparkfun.com/SparkFun_GNSS_Flex_System/SparkFun_GNSS_Flex_pHAT/hardware_overview/#jumpers) are used to isolate signals from the peripheral (Pi, Nano, etc) in the case you’re already using a certain GPIO pin with a 2nd device/module or similar…leave those intact/unmodified unless you have a reason to segment those circuits/avoid bus contenton issues ---
**Author:** ![Kaylyn\_Shibata](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/kaylyn_shibata/32/12556_2.png) [@Kaylyn\_Shibata](https://community.sparkfun.com/u/Kaylyn_Shibata)\ **Post date:** [May 4, 2026, 8:49pm UTC](https://community.sparkfun.com/t/lg290p-broken-tx-direction/68690/7 "2026-05-04T20:49:03Z")
i have pins 8 and 10 wired up but only the RX connection is working, not the TX. WOuld this imply a faulty module? Or what else should i be checking? ---
**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\ **Post date:** [May 4, 2026, 9:00pm UTC](https://community.sparkfun.com/t/lg290p-broken-tx-direction/68690/8 "2026-05-04T21:00:09Z")
Can you share a photo of the current wiring situation? It’s generally meant to be mounted onto the Nano’s 40-pin GPIO header ---
**Author:** ![PaulZC](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/paulzc/32/67_2.png) [@PaulZC](https://community.sparkfun.com/u/PaulZC)\ **Post date:** [May 5, 2026, 6:30am UTC](https://community.sparkfun.com/t/lg290p-broken-tx-direction/68690/9 "2026-05-05T06:30:31Z")
Hi Kaylyn (@Kaylyn_Shibata ), Please do share a photo of your connections. As a minimum, you will need to connect: GND / Ground : e.g. Pin 6 5V Power : e.g. Pin 2 3V3 Power : e.g. Pin 1 GNSS RX1 : GPIO14, Pin 8 GNSS TX1 : GPIO15, Pin 10 It is not possible to power the pHAT through the USB connection. 5V Power (e.g. Pin 2) provides power to the 3.3V regulators on the pHAT. 3V3 Power (e.g. Pin 1) _enables_ the main 3.3V regulator on the pHAT. On Raspberry Pi, this is used as a Sleep / Wake function. When POWER\_OFF\_ON\_HALT is enabled and the Pi is asleep, 3V3 is turned off which in turn disables the regulator on the pHAT. I hope this helps, Paul