Re: Oven LCD display dim and uneven
I am ready to throw in the towel. I replaced all the caps and the display remains the same. The attached picture shows the issue, bright in the horizontal center, dim vertically above and below. All the connections appear good. All the cathodes glow red. I was unable to test the actual voltage of the cathodes and anodes while connected to 120v AC as I did not want to touch the wrong part and short it out. Not sure what the issue is other than the display is just worn out. If the entire display was dim, or blank, that would lead to a faulty part....
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Last Activity: 10-15-2018, 10:53 AM
Joined: 09-12-2018
Location: Atlanta, GA
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Re: Oven LCD display dim and uneven
The display gets power, but it is dim and uneven. What specifically should I test? (ie, What on the display board should I test with the multimeter?). Sorry for the basic questions. The spark module works so the Power board is likely passing along 120v to the spark module....Leave a comment:
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Re: Oven LCD display dim and uneven
Not sure, how do I test that? The range works normally, the gas burners light up quickly, and the gas oven is strong. Since its a gas range, it does not use much AC. Thanks....Leave a comment:
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Re: Oven LCD display dim and uneven
I went ahead and tested the diodes, and all were good. One tested funky in circuit, but after pulling it, it tested good.
I then pulled the three very small caps on the display board (I already changed the caps on the power board) to see if they were good, and I got the following:
- 4.7uf 35v tested 4.87uf with an ESR of 11 ohms
- 0.47uf 50v tested 0.433 with an ESR of 13 ohms
- 10uf 16v tested 11.14uf with an ESR of 9.2 ohms
All three tested within specs, although the 50v is on the low...Leave a comment:
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Re: Oven LCD display dim and uneven
I think I figured out the location of the rectifier. There are several diodes near the large caps, named D1, D2, D3, etc. I believe those are the rectifier diodes. Thanks.Leave a comment:
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Re: Oven LCD display dim and uneven
I pulled the board again to get the specs on the caps on the display side. The picture above of the display is not mine, I found that on the internet. The picture in this post is the display side of my board. At first I thought there was a problem due to the dark spot in the upper left of the display, but the picture above has the same spot so I am assuming that is part of the design.
The three caps on the display side are small:
0.47uf 50v 105c (to right of display)
4.7uf 35v 105c (lower right of display)...Leave a comment:
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Re: Oven LCD display dim and uneven
Thanks, I will try these suggestions.Leave a comment:
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Re: Oven LCD display dim and uneven
The board has two levels. The bottom level has the caps, the top level has the display. The two boards are connected by a series of metal wires on one side. The solder side of the boards was difficult to access, I had to slowly pry the boards apart (bending the metal wires) to access the solder holes for the caps. Picture attached showing the inside of the two boards and the new caps installed. I didn't focus on the top level when I had it out. I found a picture of the top level on the internet and it is attached. It does not look like there are...Leave a comment:
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Re: Oven LCD display dim and uneven
I changed the caps and no dice, display is still uneven. Looks like the VFD is worn out. The old caps all tested good except the ESR was a little higher than the ESR of the new caps.Leave a comment:
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Re: Oven LCD display dim and uneven
Thanks for the comments. I am going to change the caps and see if that does it. Also, I realized this is in the wrong forum, it should be in the Other Wierd Devices, if a mod could move this there, thanks.Leave a comment:
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Oven LCD display dim and uneven
I have an 18 year old Frigidaire range (combo oven and cooktop). The display (part number 316080102, no longer in production) is dim and uneven. It looks worse than in the picture. The red letters in the upper right of the display are particularly dim, this is where the temperature is displayed. I opened up the control panel and the caps do not have obvious tell tale signs of failure. There are 4 caps - 100uf 50v, two 470uf 16v and 3300uf 16v. Do you think the caps are bad (and if so which one), or is this a sign the LCD display is bad? Thanks for your thoughts. Pictures below.... -
Re: New Members - please post your introductions here
Hello, I am interested in learning about capacitors and hopefully identifying what is wrong with my oven display. Thanks!Leave a comment:
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