How to preheat an lg MH-3948W owen - LG Microwave Ovens

That would be a shorted high voltage capacitor.

Samsung support in South Africa is here:
https://www.samsung.com/za/support/

I would bet your oven's model number is a JVM185#xx### or JVM186#xx###.

We see (and repair) this a lot. The problem is a failed capacitor on the control panel, which we regularly repair nationwide by mail for $39.95 postpaid.

At our Web site, you can get details of our service, plus we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

NEED APPRATING MANUAL

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

hhg

If there is not enough airflow around the oven it will turn off for safety. It will reinstate itself once it has cooled.

If this does not recover I suggest you call for a warranty service, but I am hopefiul its just the overheat sensor.

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Try this website: http://www.service-manual-owner.com/lg.html You may have to email the person to get the manual?

Okay, it does sound like your membrane keypad is worn out at the Start pad.

It may be available separately as a key sheet or already attached to a new plastic frame.

In case it comes as a key sheet and if you (or someone you know) might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved.

LG's Latin American Wen sites are here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Many LG/Goldstar manuals can be downloaded here.

Otherwise, for Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

I would contact LG / Goldstar.

For Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

For Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit http://www.lgservice.com.

We're happy to help and we appreciate your thoughtful rating of our answer.