DWH B00W dishwasher with flown component - Page 1
Forum section: electronics / repair

author: ljcarballo
author_rank: Contributor
timestamp: May 16, 2021, 09:33:34 pm
content: Let's see if someone has a plate for this dishwasher and can help me by giving me the nomenclature of the component marked in red in the photograph, which is marked on the plate as "TR01"

author: amyk
author_rank: Super Contributor
timestamp: May 17, 2021, 02:31:21 am
content: It's an ST part. Wipe off the thermal paste and we may be able to tell you more than that.

author: Koray
author_rank: Regular Contributor
timestamp: May 17, 2021, 01:17:21 pm
content: No no it is not thermal paste, it looks like the part has exploded. Maybe you can find the flown off pieces inside the machine?K.

author: ljcarballo
author_rank: Contributor
timestamp: May 17, 2021, 08:38:34 pm
content: Unfortunately I could not find anything, so the first thing I did was look for photographs to see if I was able to find the silkscreen of the component or the schematic of the plate, but I have not been successful.Quote from: Koray on May 17, 2021, 01:17:21 pm

author: Alex_Baker
author_rank: Frequent Contributor
timestamp: May 20, 2021, 06:57:59 pm
content: My guess is that it would be a triac, judging by the use of "tr*" instead of "Q*", which would normally be a transistor or fet, but who knows what some factories would do. The manufacturer could have named it "tr" for transistor.

author: BrokenYugo
author_rank: Super Contributor
timestamp: May 20, 2021, 07:27:02 pm
content: Looks like every three pin semiconductor device on the board is marked "TR*". So either they're all triacs (check) or it just means the more generic "TRansistor". Either way there's always reverse engineering if an identical board can't be found to get an exact number.

author: samnmax
author_rank: Regular Contributor
timestamp: May 21, 2021, 08:52:19 am
content: I also think it's a triac. Here's the service manual for the DWF B00W, should be similar (taken fromhttps://elektrotanya.com/whirlpool_dwf-b00w.pdf/download.html).Check the circuit diagram (sadly a high-level diagram, not a schematic). There are 5 triac symbols inside the UCB (User and Control Board). You can follow the traces to the edge connector and identify which component is it connected to (WV1, WV2, DPM, SPM...).

author: TheMG
author_rank: Frequent Contributor
timestamp: May 21, 2021, 01:40:17 pm
content: One thing to think about before replacing the TRIAC: why did it blow up?Find out what device it is responsible for energizing, and check it for potential shorts/overload.

author: ZedaPeida
author_rank: Newbie
timestamp: May 21, 2021, 01:56:46 pm
content: Most likely it´s a T4 series triac and it's probably controlling the drain pump. I would put a T405 if the gate is directly controlled by the micro, but first check if the pump or whatever is good. Check the gate resistors aswell.

author: ljcarballo
author_rank: Contributor
timestamp: May 21, 2021, 09:52:55 pm
content: Thanks for the answers, with all the information that I have been collecting, I believe that as it says "ZedaPeida" is a triac of the series t405 with an encausulation "IPAK (T4-H)", the door controls it directly the microprocessor.The failure occurred when one of the cables that passed under the door was cut and made a short circuit in the sheet.