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Replaced capacitor 1200uf 35v 150c in my magnavox 37MF231D and plugged back in and as soon as it has power supply, it starts squeaking in 1 second intervals at a medium volume and high pitch with no display or power light active on television.

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The squealing you hear comes from the power source. Here's what's happening: there's a big short on one of its outputs; when you try to start the tv there's a very high current that goes thru it; this current forces the power source to work way beyond its limits - it gets severely overstressed - and the transformer is extremely solicited = the squealing you hear; that much overstress triggers the autoprotection of the power source and it cuts it down = the squealing stops; with the power source down al the voltages drop, including the ones from the autoprotection system, who gets reseted and the power source start again, squealing = the process repeats and it will repeat as long there is power.
You must find the short and you must do that by testing the output voltages on the power source.
BTW if one capacitor has failed the others can't be far behind - replace them all.

Posted on Nov 10, 2010

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32MD251D/37 will not power on



Zack Corpier

Workup for repair

02/22/2013

Diagnosis for Magnavox 32MD251D/37

Symptoms:

Will not power on

Once on, if turned off power might not return

Does not respond to power cycling

Possible Culprits:

Overloaded fuse

Damaged/fried power board

Damaged/fried inverter board

Damage to wiring or related

Overloaded capacitors on power board - I identified this based on a visual inspection and a multi meter test




https://lh6.googleusercontent.com/-Mcf67G5l3l8/USgitModWZI/AAAAAAAACRo/PwjueC45Hjo/w333-h319-o-k/caps.png


Problems Identified:

Capacitor 2079 appears overloaded - 1200uf 35v

Capacitor 2080 appears overloaded - 1200uf 35v

Explanation:

The capacitors referenced regulate the voltage controlling the power. These caps have a limited lifetime in hours which is usually around 3000. The device was left on for an extended period of time overloading these essential components.

Resolution:

1. I will order a set of replacement capacitors

2. Discharge board prior to work

3. Remove and replace damaged capacitors

Required Parts (total cost $30):

(2) Vented axial 1200uF 35v Capacitors - $8

Variable wattage soldering iron (minimum 35w) - $22


Feb 10, 2013 | Magnavox 32MD251D/37 Tabletop Pedestal...

2 Answers

LCD TV won't turn on- power light flashing


This is a very common symptom of a failure in the power supply board. The failure is caused by parts called capacitors. Here is a link to information on what needs to be replace on the power supply board to repair it. It is an easy repair, takes about 20 minutes.

http://www.ccl-la.com/catalog/product_info.php?cPath=95_97&products_id=216

Jul 21, 2012 | Toymax Magnavox 37MF231D 37 in. LCD TV

3 Answers

Magnavox 37MF321D/37 power light & screen flash, won't come on.


Hello,

A full capacitor kit for the 37MF337 and 37MF321 models is available here:

http://www.ccl-la.com/catalog/product_info.php?cPath=21_77&products_id=216

The kit contains all 8 capacitors needed to rebuild the power supply board

Aug 27, 2009 | Philips Magnavox 42MF521D/37 Television

8 Answers

My magnavox 37MF321D/37 will not turn on. It


I had the same problem with the blinking green light. These are the parts one the power supply I replace to repair it. note: If the power supply is repaired you will get a solid green light and the backlight will light up almost immediately.
5df38cd.jpg

Aug 01, 2009 | Philips Magnavox 50ML8105D 50" HDTV DLP TV

1 Answer

Magnavox lcd tv not turning on


Also changed swollen C2074 and C2081 and it now works perfectly! a bit daunting for a novice like myself but with a steady hand and decent 'put it back the way you took it apart' skills, all went well!

Mar 22, 2009 | Toymax Magnavox 37MF231D 37 in. LCD TV

2 Answers

Magnavox 37MF231D 37" LCD TV "popped" now won't turn on at all!


Capacitors tend to pop when they fail. Phillips LCD TVs have lots of problems with capacitor failures in their power supplies. I've got my 37mf231d apart on my workbench as we speak. Mine makes a whistling sound which I believe is either a solder fault or a bad capacitor.

A new power supply board is about $150 for that TV. The gamble, of course, is if the power supply took out something else when it failed.

Jan 16, 2009 | Philips 37MF231D 37 in. LCD Television

6 Answers

Magnavox: 37MF231D/331D/321D


Calm down Calm down. The problem is quite simple. You need to change one maybe two capacitors. Upon removing back cover. Look to the left, after removing foil tape, remove screws and flipover the board. The first cap to go down may have abulge on top or black tar oozing out the top. It is a 25volt 2200mf cap gone bad. Replace it. Second, sometimes and just sometimes next to thatone is 35volt 1200mf cap goes bad......remember just sometimes. You may have to replace it as well.

Jun 04, 2008 | Philips Magnavox 27MS343S 27" TV

17 Answers

Magnavox 37MF231D/331D LCD



1. Remove all screws around perimeter, one screw at the lower right at (Side A/V), and 2 1”round plastic knob s.
2. Remove back cover
3. At lower left side remove 2 screws for On/Off switch cut tie wrap that holds wire down for free movement.
4. Disconnect wire connector to side A/V at lower right side
5. Disconnect wire connector to right side circuit Board
6. Disconnect wire connector to left side circuit board
7. Remove the 2 mounting brackets upper left and upper right 2 screws each.
8. Remove 3 screws each side of the metal box in the middle
9. Fold back metal tape off bottom and top of metal box
10. 1 wire connector at top of box I left connected
11. Flip metal box over towards top of Tv. Be careful of wire at top thats still connected.
12. On left side in box is power supply board
13. Towards bottom of board you should see the numbers C2081 and C2074
14. Remove the six screws holding down power supply board
15. Flip board down towards bottom of Tv.
16. Unsolder capacitors replace with new 1200uf 35v and 2200uf 35v 105°C radial capacitors
17. Capacitors should be around 1/2” to 5/8” dia. X 1.25 long appox. 2 Wires come out of one end should be .030 dia.
18. Reassemble in reverse order and enjoy

Mar 28, 2008 | Philips Magnavox 27MS343S 27" TV

1 Answer

TV will not Power Up / Blinking Green Light on Power Button


May be the same problem Magnavox is having with their 27MF231d. I found the fix on this site and it took care of the same problem with my set. Not the easiest thing to do, but it worked. If you do not know how to solder, get some help with this one. If you take it to a Magnavox Authorized repair location, they will just replace the bad capacitor with another bad capacitor of the same type and voltage. The problem is they have a 25w capacitor where a 35w capacitor should be. Mine was bulging, with black tar looking stuff coming out of it. It was obviously bad. Follw the instructions below.

1. Remove all screws around perimeter, one screw at the lower right at (Side A/V), and 2 1”round plastic knob s.
2. Remove back cover
3. At lower left side remove 2 screws for On/Off switch cut tie wrap that holds wire down for free movement.
4. Disconnect wire connector to side A/V at lower right side
5. Disconnect wire connector to right side circuit Board
6. Disconnect wire connector to left side circuit board
7. Remove the 2 mounting brackets upper left and upper right 2 screws each.
8. Remove 3 screws each side of the metal box in the middle
9. Fold back metal tape off bottom and top of metal box
10. 1 wire connector at top of box I left connected
11. Flip metal box over towards top of Tv. Be careful of wire at top thats still connected.
12. On left side in box is power supply board
13. Towards bottom of board you should see the numbers C2081 and C2074
14. Remove the six screws holding down power supply board
15. Flip board down towards bottom of Tv.
16. Unsolder capacitors replace with new 1200uf 35v and 2200uf 35v 105°C radial capacitors
17. Capacitors should be around 1/2” to 5/8” dia. X 1.25 long appox. 2 Wires come out of one end should be .030 dia.
18. Reassemble in reverse order and enjoy

Nov 26, 2007 | Philips Magnavox 52MF437S/37 52 in. LCD TV

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