Siemens washing machine board repair... Identifying components and fault - Page 1
Forum section: electronics / repair

author: noobiedoobie
author_rank: Regular Contributor
timestamp: January 23, 2024, 08:11:05 am
content: Hi,I was trying to fix my washing machine that wasnt letting in water, long story short, i put my DMM test leads on two points that were too close and that led to a short and blew a few components.I need help to replace these components. Pics attached-Component A: Looks like a diode but couldnt find any details of the part numberComponent B: Looks like another diode pobably Vishay? The markings are RJ 9AComponent C: Z9M searched the net and seems to be a triac.The bigger problem is i am not finding these in the market and buying from Alibaba would cost me as much as a new board for the machine given the MOQ requirements and shipping.What would be the best alternatives for these? Can I use some other components that do the job?Also I find that a diode GP10T is also burnt.Its an old siemens washer everything is great except this....

author: fzabkar
author_rank: Super Contributor
timestamp: January 23, 2024, 09:40:12 am
content: Z9M = Z0109MUF Triachttps://www.st.com/resource/en/datasheet/z01.pdfRJ = probably a 1A, 600V fast recovery diodehttp://markingcodes.com/search/c/rjSee the application circuit for the TNY264GN in this datasheet:https://www.power.com/downloads/documents/tinyswitch-ii_family_datasheet.pdf

author: noobiedoobie
author_rank: Regular Contributor
timestamp: January 26, 2024, 02:22:02 pm
content: But it doesnt look anything like the diode in the sample circuit. The diodes in the datasheet are 1N4937 and 1N5819... i couldnt find anything that was a diode with the markings S RE8.

author: fzabkar
author_rank: Super Contributor
timestamp: January 27, 2024, 05:24:04 am
content: 1N4937 would be equivalent to "RJ":https://www.mouser.com/datasheet/2/149/1N4937-193667.pdfThis could be "SR" (SMAJ170A):https://www.ruten.com.tw/item/show?22220117203596https://gcs.rimg.com.tw/g2/c/62/8c/22220117203596_213.jpg(photo)https://www.farnell.com/datasheets/2182694.pdf(datasheet)

author: noobiedoobie
author_rank: Regular Contributor
timestamp: February 16, 2024, 06:28:31 am
content: thanks a lot!....I now suspect that the problem could be deeper. There could be a microcontroller on the board that is blown. Is there a way to get the code in case i replace the uC with a new one or do i have to get a new motherboard itself?any website where they have the code for the washing machine boards?

author: noobiedoobie
author_rank: Regular Contributor
timestamp: February 16, 2024, 12:15:10 pm
content: Quote from: fzabkar on January 27, 2024, 05:24:04 amI know this sounds silly but I am not finding the component where I live... Can I instead replace SMAJ170 which is a transient voltage suppressor with a short?

author: gamalot
author_rank: Super Contributor
timestamp: February 16, 2024, 01:19:12 pm
content: Quote from: noobiedoobie on February 16, 2024, 12:15:10 pmNooooooo!!!!!I'd rather leave it open circuit.

author: noobiedoobie
author_rank: Regular Contributor
timestamp: February 16, 2024, 02:23:51 pm
content: Quote from: gamalot on February 16, 2024, 01:19:12 pmOmg i was about to short it and power it on... Then just thought of checking if there are any answers here... Phew!Saved in the nick of time.... Thanks! I don't know what else would have blown up on the board

author: mikerj
author_rank: Super Contributor
timestamp: February 16, 2024, 05:38:34 pm
content: Quote from: noobiedoobie on February 16, 2024, 06:28:31 amNew board time, washing machine controllers are not a common subject of reverse engineering by hobbyists and the micro is certain to be locked for reading.

author: noobiedoobie
author_rank: Regular Contributor
timestamp: February 17, 2024, 05:19:24 pm
content: What options do i have... Long story short, I have spent good amount of time and money to replace the spider, the bearings of the machine but the water wasn't coming in so to test if there is power to the valve i clumsily stuck by multimeter on the connector and accidentally thr probes touched shorted the power line to the valve and blew a triac and the TNY264 after replacing it I learnt that the board that handles the controls is also blown. So found a transistor wasnt working but after replacing the transistor I find that even the touch pcb is getting AC... I am not sure if thats how its supposed to be.The main board had a Freescale chip for which I can't get a datasheet...There is another chip ATMLH932 I don't what it is... An Eprom?Otherwise the whole machine is as good as new

author: fzabkar
author_rank: Super Contributor
timestamp: February 17, 2024, 06:47:58 pm
content: AT24C01BY6-YH-T, Atmel, 1Kbit, I2C-compatible, 2-wire Serial EEPROM, marking 01B + H, MLP2x3-8:https://ww1.microchip.com/downloads/en/DeviceDoc/doc5156.pdf

author: noobiedoobie
author_rank: Regular Contributor
timestamp: February 17, 2024, 07:04:14 pm
content: Would it be possible to get the datasheet of the freescale uc?

author: noobiedoobie
author_rank: Regular Contributor
timestamp: February 17, 2024, 07:19:43 pm
content: Anyway this is the main board:I find that there is no 5v at the 7805 pins... There is no voltage at all...I just replaced the TNY264... How do i still verify its not the TNY264 at fault and not something else