Toymax Magnavox 37MF231D 37 in. LCD TV - Answered Questions & Fixed issues
Magnavox 37MF231d/37 LCD TV cycling thru colors
Sounds like The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; [Exclude the model number], in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
I have a Magnavox 37MF32id137 we turned the tv off
You have a bad Capacitor. Look for a bulge on this cap. Location is 2074 and it is a 25volt 2200MF cap gone bad! And there may be another very close by that may also need replaced...you will see it ,and is bulged or skinned
TV turns on in the middle of the night
- If the TV has a timer option, ensure it is disabled.
- Check the remote control to see if any of the buttons are stuck that may be interfering with the TV.
- Unplug the power cord of the TV from the AC wall outlet for 60 seconds.
- Plug the power cord back into the AC outlet.
- Attempt to turn on the TV.
- Remove all remote controls from the room where the TV is located.
OR
unplug all HDMI sources to see if a device is sending signals in the middle of the night
The master lcd inverter bd. has a red led that goes out after few seconds
Hello, that set has a pair of inverter boards (back light boards) that usually are the cause, you may want to look for bad connections on the transformers and check the little white fuses to be sure their good. But these sets are getting old enough that I've seen the florescent tubes in the display go bad and cause the set to go into shutdown. If you want to try the bak light boards, I found these on E-bay for $20......thanks
Have a humming noise in both of the speakers
Something's crossed, keep power lines and sound lines seporated double check wires in and out u could have bad sound wires and if so of home just buy new for a car get the RCA lines with a built in ground.
Lights only go on standby
How many times this standby/power light blinks at one time switch ON? Count it carefully. These blinks are fault indication, and known as blinking codes. From the number of blinks occur at one time switch ON; you can get an idea about the faulty circuit stage inside the TV. This will make repair easy.
For more information, check the link http://electronicshelponline.blogspot.com/. If the blinks continues, and non-stop, the fault should be with its main system control IC, and with the memory IC.
Magnavox 37" model 37mf231d-37 wont tun on when i hit power button the screen lights up for a secongd and turns right back to black and the power button green light comes on and right back off I found
Your power supply is weak. If you think you can repair this I will tell you how. If you cannot do this,find someone who works electronics and share this repair. Two capacitors are bad. When pulling the back cover off, you may see one or two capacitors bulged. Even if they look good....replace these capacitors. The locations are numbered and, the capacitor having a value and temperature of 105 degrees.. Location of the first capacitor is 2074, value 25volts @ 2200 mf @ 105 degrees and will most certainly be bulged. The next capacitor may look fine....replace it. That capacitor location is 2066, value is 35 volts @ 1200mf @ 105 degrees. When you replace these, please be sure to get the polarity (positive leg and negative leg) of these capacitors seated correctly...this is a must. This will correct your TV. You will save lots of money, because you asked. Thanks for listening ..good luck...we will be here for your next repair.
Magnavox_37mf231d replaced caps still does not work
Please take this steps on how to determine the problem:1. Open the back cover.2. Check the power supply output...It should have 5vdc for the main board..12vdc or 16vdc for the audio and 24vdc for the back-light inverter..3. If those 3 voltage supplies have encountered voltage drop...The problem could be on power supply board..4. If the power supply output is normal..The problem could be on the main board...5. If the problem is power supply you should check if the capacitors are bulged on the top and try to replaced it..If you can't do that you can purchased new power supply board..6. If the problem is on main board there is no D.I.Y repair on that so you need to buy a new main board that fits to your TV..Hope this solution will be helpful..
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