Are magnavox tvs 47mf437B/37 know for power supply failures?

A 'chirping' sound usually indicates a bad startup cap, a shorted diode on the secondary of the transformer, or an excessive load. Because of the usual design of these power supplies, it's probably not a startup cap.

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.
If blinks continue without any pause, the main board is faulty.
Circuits to Magnavox and Philips are alike; and the blinking codes too might be.
Counting of number of blinks to Philips TVs is entirely different to that of other brand TVs. It is not a direct count procedure. The site have details about how to count the number of LED blinks [Fault Codes] to Philips brand TVs are given; along with details of the faulty circuit location.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Power supply board is most likely issue here.

Hello,

power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

Hope it work with the solution

replace the main power board, would be the best way

This problems,very common in LCD tv,after the tv was in used about a year or two.The new technalogy LCD tv don't handle heat very well,not like the old CRT Tube Tvs.The power supply board tend to have bad capacitors componnents leakage,that bulges up it top or puff up gases escape,that why it take times or couples pushes to the power botton to turn the tv on.U know basic electronic's,and have soldering tools and solders?Take the tv aparts,check for these bad capacitors,that bulges,puff up in the power supply board and replaced them,than ur power will work normal again.Or tries Websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

i need a screen off a 47inch magnavox if u coudent fix urs and ur interested in selling me ur screen let me know
(47mf437b/37) [email protected]

did u fix ur tv? i broke the screen off mine and need to get one. if ur interested in selling me urs let me know 47inch magnavox (47mf437b/37) [email protected]

The most likely failure is the main power supply. You may be able to identify it with the following instructions:
Unplug your set overnight to allow potentially hazardous voltages to discharge, remove the back panel of the set so you can see the guts.
Look for a smaller board with larger parts on it; some cylindrical (capacitors), others block-like and relatively large (chokes and transformers).
You should also see a relationship between the board and the incoming AC.
Check the board for a label or if not present, a stamped-on number.
Call the manufacturer's service center with your TV model number and the number found on that board and inquire about repair/replacement costs; if both are offered, they won't be that much different.
If you must buy a new board, don't dispose of the failed one as there are smaller companies that can repair it for less than the mfr. and then keep it as a spare as this problem will likely arise again.

Unfortunately, the Magnavox name is owned by the Japanese Funai company which is known for poorly designed and not very reliable products.