Loses sound right after power up. To resolve we must leave on in Mute mode for 5-10 minutes, then power off, unplug and plug in power from wall then turn power on. This works the majority of the time. Also, colors vary until sound problems go away. These seem to be symptoms related to power supply, but not sure. Device is less than 2 years old.
SOURCE: 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
SOURCE: Philips 42PFL3603 tv sound but no picture.
phillips has had a problem with their video boards lately (last 2 years) on units over 42" , i have had a 52" with same problem and repaired it. the board needs replacing in all cases ive seen. the repair is about 400.00 ( 185.00 parts and rest is labor) phillips will replace it but be cautious the ship out refirbs from Atlanta which are usually in terrible shape from my experiences. They stopped using the refirm company but there are still dozens of bad replacement units out in their warehouse. You can demand a refund too (they write a check and want you to ship the unit back or its serial label) but they wont refund sales taxes.
SOURCE: Magnavox 32MF337B/27 power supply works and
hi i have a 50" magnavox that has a problem, i was looking at several websites and i find out the dirfferent posibilities.
in your case i have 2 posibble answers.
1) negative image
tv turns on and shots down in 2sec
flashing pixels on screen
dark image
has sound but no video
screen goes black and then return to normal picture
vertical color lines on screen no video
vertical color lines with video
vertical bars on screen
horizontal lines on the image
picture goes red after while
IT COLUD BE (X or Y or Z SUSTAIN BOARDS )
2) just left part of screen working
just right part of the screen is working
vertical and horizontal lines on screen
part of screen not working
some functions not working
no video but has sound
functions not working at all
IT COULD BE (LOGIC CONTROL BOARD)
TErry HerreRA
SOURCE: Magnavox 37MF231D 37" LCD TV "popped" now won't turn on at all!
lOOK AT THE POWER SUPPLY ,lOOK FOR VENTED TOPS ON THE CAPACITORS,IF YOU FIND VENTED TOPS REPLACE THEM WITH THE SAME MICRO FARADS BUT A HIGHER VOLTAGE RATING.
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