Philips TV Model 37mf331d/37 Power Supply Repair

Philips TV Model 37mf331d/37
2006 – 37” LCD TV with Fluorescent Backlight
Information on TV

Got a call about this Philips TV and was asked if I could fix it. When I went to check it out the TV was already taken apart and the owner had already researched the issue identifying the power supply as the culprit. At first look I saw that he was right because there was a section blown out to include an erupted capacitor. So I left with a part number of and the power supply.

715t2056-1 Issues Identified
715t2056-1 Issues Identified  

Power Supply Unit: 715t2056-1

This the same power supply used in several products so I thought if nothing else I might be able to salvage an old power supply board from something else. Its more fun to try and fix the issue so I was hoping salvage wouldn’t be the solution. I ordered the surface mounted resistor, zener diode and capacitor from Mouser for less than $2.

I removed and replaced the capacitor with no issues. Then I began to remove the diode and the damage really reared its head. Whenever these parts blew it blew a chunk of circuit board with it that wasn’t noticeable until the solder was taken off. This took off the surface mounted resistor and the mounting location for one side of the diode. Well crap! After giving this some thought I came to the conclusion that the resistor was probably more for tolerance matching and protection than anything else so I refilled the broken trace and connected the diode directly to it. This was a bit sloppy due to the missing pieces of circuit board so I covered the area with hot glue to secure it.

715t2056-1 New Part Installed Top
715t2056-1 New Part Installed Top
715t2056-1 New Part Installed Bottom
715t2056-1 New Part Installed Bottom

A. Capacitor  B. Diode Connection  C. Repaired Broken Trace, Bypassed Resistor & Diode Connection

Not being able to test it immediately after repair made me a bit worried. Today I went back and installed the repaired power supply and reassembled the TV just enough to test it out. When we plugged it in I could hear it hum to life automatically. Initially it did nothing but light up the power button but after a few seconds the screen came on and this older flat-screen TV got an extended life for less than two dollars.

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