Question about Televison & Video
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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Posted on Jan 02, 2017
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Workup for repair
Diagnosis for Magnavox 32MD251D/37
• Will not power on
• Once on, if turned off power might not return
• Does not respond to power cycling
• 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
• Capacitor 2079 appears overloaded - 1200uf 35v
• Capacitor 2080 appears overloaded - 1200uf 35v
• 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.
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
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