Induction cooker blown T Fuse and IC md12h - Page 1
Forum section: electronics / repair

author: smile
author_rank: Regular Contributor
timestamp: October 30, 2023, 07:11:53 pm
content: I have a blown mains fuse that I reset. Forgot to use the lamp while repairing. The induction heater fuse is not blown. there is IC blown md12h. An there is T FUSE like resistor blown.What to replace the T Fuse with? I ordered IC from aliexpress.

author: smile
author_rank: Regular Contributor
timestamp: October 30, 2023, 07:12:38 pm
content: Board front

author: fzabkar
author_rank: Super Contributor
timestamp: October 30, 2023, 07:34:59 pm
content: Some info on the IC ...http://www.topctc.com/wproducts_content-102731.htmlT-Fuse looks like a fusible resistor. You might need to trace the circuit in that area.

author: smile
author_rank: Regular Contributor
timestamp: October 30, 2023, 07:49:47 pm
content: By looking closer t fuse maybe is unuser port to the right, and burned resistor is labeled r33 measures 2 megaohms.What value it can be? the stripes are not clear. I wonder what schematic I can use as no model number is available.Found video with similar board, but no schematic link.

author: fzabkar
author_rank: Super Contributor
timestamp: October 30, 2023, 08:09:15 pm
content: The resistor is situated between two rectifier diodes and a filter capacitor. It carries the full switching current of the MOSFET chopper within the IC. Therefore, it must be a low value resistor, possibly fusible.

author: smile
author_rank: Regular Contributor
timestamp: October 30, 2023, 08:15:04 pm
content: Found manufacturer SunchonglicProduct SE-11Fhttps://www.alibaba.com/product-detail/Sunchonglic-induction-cooker-control-board-with_62423016281.html

author: fzabkar
author_rank: Super Contributor
timestamp: October 30, 2023, 08:49:12 pm
content: I'm colourblind, but it looks like a 10 ohm, 1 watt resistor to me. I'd go with a fusible/flameproof type.

author: smile
author_rank: Regular Contributor
timestamp: October 30, 2023, 10:33:04 pm
content: In this video 6:12min (similar board ) you can see it is 22Ohm 1%Here is image also the same value 22Ohm 1%https://www.flipkart.com/electronic-spices-2200w-220v-circuit-board-coil-electromagnetic-heating-control-panel-pcb-induction-cooker-heavy-heatsink-components-hobby-kit/p/itm869a9656ea518Resistor seem to be 3W

author: fzabkar
author_rank: Super Contributor
timestamp: October 30, 2023, 10:38:47 pm
content: I was looking at this one:https://sc04.alicdn.com/kf/H64bfa7c739b7460998b16e1f75d4fc30C/200194169/H64bfa7c739b7460998b16e1f75d4fc30C.jpg

author: fzabkar
author_rank: Super Contributor
timestamp: October 30, 2023, 10:49:34 pm
content: Quote from: smile on October 30, 2023, 10:33:04 pmhttps://2.bp.blogspot.com/-egRQwPx2qjM/UxJrNLhGBkI/AAAAAAAANnU/Lt710PV0Sqk/s1600/resistores-dissipacao.gifI'm seeing the sizes as 1/4W, 1/2W and 1W. Or maybe it's 1/4W, 1W and 2W?

author: smile
author_rank: Regular Contributor
timestamp: October 30, 2023, 11:01:00 pm
content: I found this image also

author: Swake
author_rank: Frequent Contributor
timestamp: November 01, 2023, 07:00:45 pm
content: Your R33 is as big as the glass fuse. That is at least 3W.For the value:The last picture is a more recent board (V10) so take this with some precaution. Colors I see: Green - Brown - Black - Gold - Black. That is 51 Ohm at 5% tolerance, and the last black ring indicates it is wire wound. A fusible resistor is generally indicated with a white or very light gray ring. 51 Ohm is a standard E24 series value. It is also smaller than the one on your board.

author: fzabkar
author_rank: Super Contributor
timestamp: November 01, 2023, 07:21:22 pm
content: Quote from: Swake on November 01, 2023, 07:00:45 pmSorry, I was looking at the wrong PCB. <slaps forehead>