Re: Monitor Interlook switch on a microwave
Finally had an opportunity to go back and look at the switch. What I found leaves little doubt as to the cause of the failure!
Thanks for help me understand how microwaves are designed!...
papillon
Member
Last Activity: 04-21-2023, 07:32 AM
Joined: 03-10-2023
Location: Ontario
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Re: Monitor Interlook switch on a microwave
There's still something I'm not understanding. On the diagram attached to the first post, the monitor is connected on the 'left' side of the power relay, while the transformer is on the right side. Shouldn't this mean that when the door is closed, the monitor is also closed, thus causing a short?
If the monitor were on the other side of the relay, I would understand: if the door were opened while the transformer was active it should short, but having the monitor located before the relay does not work in my model,...Leave a comment:
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Re: Monitor Interlook switch on a microwave
Thanks for the link: very informative article.
A dead short by design!? That's an effective (and pretty radical) way to implement a safety measure!
thanks again!...Leave a comment:
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Re: Monitor Interlook switch on a microwave
A quick search reveals that "interlook" probably was a typo and should have read "interlock" instead. It could be that the role of that switch is to fail when a specific condition is detected. but is it good design to have it blow a fuse when that occurs? Is that how all microwave ovens are designed?
And what exactly is it monitoring? An open door?
I'm probably missing something pretty obvious, so thanks for shedding some light on this for meLeave a comment:
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Monitor Interlook switch on a microwave
I *was* trying to determine the cause of a failure in a microwave oven.
The unit is a Frigidaire Gallery model CGMV175QFA.
For future reference, the exploded view for this specific model is available [URL="https://ecommcdnprod.azureedge.net/model-documents/bapg_electrolux_product_support/CGM/CGMV175QWA/5995680211.pdf"]here[/URL].
The last page of that document also has the electrical diagram which I am attaching to this message as well.
The unit had a blown fuse when I opened it. I tested each component individually (magnetron, relays, tracsformers,... -
Re: HiSense 55H6570F
Was just reading your latest comment and considering that hisense is not making the firmware readily available, I am concluding that getting a replacement board is likely the only practical option at this time. thanks for sharing your findings...Leave a comment:
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Re: HiSense 55H6570F
Thanks for your input.
I noticed in your post that you tried re heating the board/CPU. Did that help at all?
I noticed a lot of heat coming from the array of resistors below the LED connector, so I'll start to probe around there. What kind of voltages are you getting (if any) from the LED driver?...Leave a comment:
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HiSense 55H6570F
Looking for help in figuring out how to narrow down the source of the problem for a HiSense 55H6570F with an integrated multi-function board*
When plugged in, the power LED blinks a fraction of a second. The TV cannot be powered on, no activity on the LCD. The LCD was removed and the LEDs were tested individually: all are working fine.
The output of the transformer is 95.5v. The positive lead out of the LED driver (LEDP) outputs ~191.2v while the negative terminal (LEDN) starts at the same value and gradually drops to 97.2v after a few moments
The connector... -
Re: Vizio D50u-D1 - Loose components
That did it! Following your suggestion, I reflowed U202, U201 and U401 and the unit now works! Not sure which one was the source of the issue but the unit now works fine!
Now, the question is how long will this repair last... I've seen comments that it works for a day or two, while others claim that it works for many months afterwards. Time will tell! Or at least my son will, when the issue resurfaces!
Thanks for your help: Very appreciated!Leave a comment:
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Re: Vizio D50u-D12 damaged mainboards?
I tested them individually. I removed the LCD and applied voltage to each LED and none were defective...Leave a comment:
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Re: Vizio D50u-D12 damaged mainboards?
ok, I'll try that tomorrow...Leave a comment:
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Re: Vizio D50u-D12 damaged mainboards?
CN9101 on standby:
pin# -- V
1~4 -- 0v
5~7 -- 19.3v
8 -- 5.2v
powered ON:
pin# -- V
1~2 -- 3.3v
3~4 -- 0v
5~7 -- 19.3v
8 -- 5.2v
(The lower row pins are the same voltage as the pins above)...Leave a comment:
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Re: Vizio D50u-D12 damaged mainboards?
Here's a picture of the 3 boards and one of the back of the TV. Currently, the power board and main board are the original ones, and the driver board is the replacement (but it has the same issue as the original one)...Leave a comment:
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Re: Vizio D50u-D12 damaged mainboards?
well, this was rather anti-climatic... I received the replacement LED driver board, installed it and ... nothing. Same problem. I still have the replacement main board available, so I installed it along with the driver board and ... still same problem.
So I'm running out of options...
Here's a recap: The LEDs all work (tested individually), the driver board and main board have been swapped (the reliability of the replacement main board is questionable, mind you). Voltage on the power supply board seems ok (19.3v...Leave a comment:
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Re: Vizio D50u-D12 damaged mainboards?
Thanks for your reply: I really appreciate it!
I have tested the LEDs individually and all work as expected. I have connected a DVD player as an input on the main board and it plays fine (I hear the sound from the speakers and see an image (without backlight) on the LCD. So chances are pretty good that the mainboard is functioning well. So my conclusion is that the driver board needs to be replaced. I have ordered a replacement and will report back if additional assistance is required.
thanks again!Leave a comment:
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Vizio D50u-D12 damaged mainboards?
Hi, I am troubleshooting a damaged Vizio TV (D50u-D1). Here's an overview of the troubleshooting I did with the unit when it was presented to me:[LIST=1][*]TV powers on and back lights turn on, with normal brightness. The large Vizio logo is displayed. After a few moments (presumably when the TV is looking for inputs), the backlight turns off and the TV goes dark. No further message is displayed on the TV. Since the logo was displayed, I concluded that the power board, LED driver board, screen, LEDs and T-con board were all working fine.[*]Although parts of the main board were working fine, I'm... -
Re: New Members - please post your introductions here
Hi all! Eric from Canada. Looking to get expert advice about hardware repairs, mostly LED TVsLeave a comment:
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