# QNAP Backplane for TS-431P **URL:** \ **Category:** General\ **Created:** [April 18, 2025, 7:17pm UTC](https://community.qnap.com/t/qnap-backplane-for-ts-431p/1057 "2025-04-18T19:17:42Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Ronny](https://community.qnap.com/user_avatar/community.qnap.com/ronny/32/1206_2.png) [@Ronny](https://community.qnap.com/u/Ronny)\ **Post date:** [April 18, 2025, 7:17pm UTC](https://community.qnap.com/t/qnap-backplane-for-ts-431p/1057/1 "2025-04-18T19:17:42Z")
Hi, I am considering buying a new backplane for my TS-431P. Anyone knowing were to buy? Stocks I checked are empty. QNAP do not sell, they only offer a service to send in and repair. I am also aware that bypassing mosfets on the BP may work, but that will be second choice if even ever done at all. I already bought a new NAS btw and have it working, but consider having this “old” one fixed anyway. ---
**Author:** ![dolbyman](https://community.qnap.com/user_avatar/community.qnap.com/dolbyman/32/136_2.png) [@dolbyman](https://community.qnap.com/u/dolbyman)\ **Post date:** [April 19, 2025, 11:01am UTC](https://community.qnap.com/t/qnap-backplane-for-ts-431p/1057/2 "2025-04-19T11:01:35Z")
I know of no internal part sales…so unless you buy another unit and use that for parts…no luck instead of bridging mosfets…why not replace them? ---
**Author:** ![Ronny](https://community.qnap.com/user_avatar/community.qnap.com/ronny/32/1206_2.png) [@Ronny](https://community.qnap.com/u/Ronny)\ **Post date:** [April 19, 2025, 11:47am UTC](https://community.qnap.com/t/qnap-backplane-for-ts-431p/1057/3 "2025-04-19T11:47:30Z")
Thanks. Good idea. I actually did that. Bought new mosfets (4957AGM), and will have those on the BP removed and replaced. ---
**Author:** ![CoOlSlY](https://avatars.discourse-cdn.com/v4/letter/c/57b2e6/32.png) [@CoOlSlY](https://community.qnap.com/u/CoOlSlY)\ **Post date:** [August 25, 2025, 1:45am UTC](https://community.qnap.com/t/qnap-backplane-for-ts-431p/1057/4 "2025-08-25T01:45:04Z")
I have a TS-431P2 with a QY-44 disk array board that I have a problem with Disk4 it’s stating Disk failed but me too it’s the mofset. Anybody know how I could do what you said on this board? (bypassing the mofset)? I would prefer that compared to buy and changing the mofset ---
**Author:** ![dolbyman](https://community.qnap.com/user_avatar/community.qnap.com/dolbyman/32/136_2.png) [@dolbyman](https://community.qnap.com/u/dolbyman)\ **Post date:** [August 25, 2025, 1:48am UTC](https://community.qnap.com/t/qnap-backplane-for-ts-431p/1057/5 "2025-08-25T01:48:31Z")
Did you see this topic? [https://forum.qnap.com/viewtopic.php?t=134212](https://forum.qnap.com/viewtopic.php?t=134212) Short of bridging or replacing the mosfet, not much to do other than buying a new NAS (You could open a ticket and see how much QNAP would charge for an RMA) ---
**Author:** ![CoOlSlY](https://avatars.discourse-cdn.com/v4/letter/c/57b2e6/32.png) [@CoOlSlY](https://community.qnap.com/u/CoOlSlY)\ **Post date:** [August 25, 2025, 3:41am UTC](https://community.qnap.com/t/qnap-backplane-for-ts-431p/1057/6 "2025-08-25T03:41:34Z")
I did read bridging of the mofset but not on the specific board of the 431P2. QNAP wants the unit for a while, they charge about ~200$ but would prefer to just jump the mofset. I don’t really understand how to test for the voltage. I know one end on one pin but where do I put the other pin, good question, on a ground? So since I don’t know too much, if I know how to short the mofset, I will have the job done by somebody ---
**Author:** ![NA9D](https://community.qnap.com/user_avatar/community.qnap.com/na9d/32/1278_2.png) [@NA9D](https://community.qnap.com/u/NA9D)\ **Post date:** [August 25, 2025, 3:29pm UTC](https://community.qnap.com/t/qnap-backplane-for-ts-431p/1057/7 "2025-08-25T15:29:01Z")
MOSFETs have 3 pins - Gate, Source and Drain. Vgs = Voltage between Gate and Source Vds = Voltage between Drain and Source Vg = Gate Voltage to ground Vs = Source voltage to ground etc. So it depends on the voltage you need to measure. Likely you are wanting to measure the voltage to ground unless you are specifically asked for measure the voltage between the pins. Make sense? ---
**Author:** ![CoOlSlY](https://avatars.discourse-cdn.com/v4/letter/c/57b2e6/32.png) [@CoOlSlY](https://community.qnap.com/u/CoOlSlY)\ **Post date:** [August 26, 2025, 1:20am UTC](https://community.qnap.com/t/qnap-backplane-for-ts-431p/1057/8 "2025-08-26T01:20:20Z")
Are they not 4 pins, not 3? ---
**Author:** ![dosborne](https://community.qnap.com/user_avatar/community.qnap.com/dosborne/32/4495_2.png) [@dosborne](https://community.qnap.com/u/dosborne)\ **Post date:** [August 26, 2025, 2:00pm UTC](https://community.qnap.com/t/qnap-backplane-for-ts-431p/1057/9 "2025-08-26T14:00:11Z")
> [@Ronny](#): > > 4957AGM You should be able to google the datasheet if you don’t have it. Example [https://alltransistors.com/mosfet/transistor.php?transistor=18397](https://alltransistors.com/mosfet/transistor.php?transistor=18397) ---
**Author:** ![CoOlSlY](https://avatars.discourse-cdn.com/v4/letter/c/57b2e6/32.png) [@CoOlSlY](https://community.qnap.com/u/CoOlSlY)\ **Post date:** [August 26, 2025, 3:17pm UTC](https://community.qnap.com/t/qnap-backplane-for-ts-431p/1057/10 "2025-08-26T15:17:15Z")
Would there be a way to have my drive bay bypassing the mofset like a post mentionned? That way, no need to replace it, just have to bypass the pins needed to have continuous power? Here’s my QY-44 board. ![IMG_8382](https://cdn-community.qnap.com/original/2X/c/c1c14a1895cea8d3c0260291e20d8053cec44f19.jpeg)