• ** REMEMBER! **The microwave can still shock you even unplugged!!

    ALWAYS discharge the high-voltage capacitor first if you even think your hands will come close to any HIGH VOLTAGE components.

    Jeff mentions this: Anything in the high voltage ( magnetron, capacitor, diode, wires to and from ):
    ...Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it.

    From Jeff's site: http://www.applianceaid.com/component-testing.php

    Jake
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ZSC1001KSS01 GE Microwave - Intermittent glitchy display

FoothillsStar

Premium Member
Joined
Nov 12, 2021
Messages
22
Location
Yuma AZ
Model Number
ZSC1001KSS01
Brand
GE
Age
More than 10 years
Customer's microwave has an intermittent glitchy display. They will trip the breaker off/on and it will work again for a while. My research indicated this was most likely the display board, called a digitron. I replaced this and it got worse, the interior light would not come on and there was no display at all. So I put theirs back in and it worked intermittently again. Assuming out of box failure I replaced the digitron again and again it did not work at all. So then I replace the main board and got the exact same behavior. Customer wants me to order the digitron a 3rd time but from a different vendor in case there was a 'batch' failure.
I don't know why it works better with the old part? Anybody seen odd behavior like this?

WB27X10856 DIGITRON
WB27X10858 CONTROL BOARD

Brand: General Electric
Type: Microwave Oven
Country: USA
Model: ZSC1001KSS01
Serial: FR900612K
2008
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
44,790
Location
Murray, Utah 84107, United States
Anybody seen odd behavior like this?
A few times on this site. Usually with parts from eBay or Amazon. Where did you get it? This part?
ge-digitron-wb27x10856-ap3883432_01_l.jpg
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
44,790
Location
Murray, Utah 84107, United States
Good parts company. I use them all the time. Appliance parts company and Reliable parts are the only two I use.
 

hypersparc

Member
Joined
Jul 31, 2022
Messages
1
Location
Saratoga, CA
The problem with your Display of your GE Microwave/Speedcooker is not the Digitron WB27X10856 display board? The flickering and ultimately failure over of the display is due to the WB27X10861 GE microwave control board which is a rebranded (LG 6871W1A417/6871W1A417A board) which GE then sells as a markup. The principle purpose of this board is to convert (i.e. rectify) AC to DC at various voltage levels needed by the rest of the microwave to run their control circuits in the microwave.

A portion of the GE microwave is always on so the AC/DC supply is always on. Overtime the electrolytic capacitors in a section of the board fail or degrade to a point they the DC supply starts to produce ripples in the DC power supply which results in circuit board failures. These ripples produce deep spikes of voltage of 120 Hz that the other circuits are sensitive too. I just examined a failed WB27X10861 board and measured the capacitance of each of the seven electrolytic capacitors. Of the 7 capacitors, 2 had failed over time. The others 5 have degraded 10 to 15 percent but still within their design spec. The two that failed, C07 - 1000uF 25 V had a measured value of 207uF and the other C08 - 220uF had a measured value of 13uF.

There was no visible bloating on either SAMWHA SG capacitor. Normally, these capacitors are rated at 2000 hour at 85 degree C. 2000 hr is only 83 days, but since the voltage is less and the temperature is probably 40 to 50 degrees inside the capacitor these capacitors may last 10 years. They harder they work the shorter the lifespan.

There are two solutions, either purchase a new replacement control board or replace the failed C07 and C08 capacitors within the failed board with better ones. You can easily buy 10,000 hour , 105 degree C rated capacitors for probably 25 cents more than 2,000 hour capacitor. Most people don't have the resources to repair a board so buying a new board is their only solution. Don't buy a used board on ebay because a used board is probably on the verge of failure.
 
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