Good place for tv parts?

[FriendlyFires]

Wondering if any of you guys know a good spot to find parts for a tv. I need to replace the power supply for this crappy toshiba tv and cant find anyone in store for a reasonable price. most places charge 100 bucks for this simple board. im specifically looking for part 75014421 for a toshiba 32av502r. checked ebay but nobody seems to have it.

[davepry]

Perhaps you do not have to replace the whole Power Supply -- if there are failed capacitors on the board, perhaps replacing the caps is all that is needed.

www.badcaps.net

[larrymoencurly]

Ebay is good for whole assemblies like that, but for individual parts, like chips, transistors, resistors, and capacitors, try MCM Electronics, Dalbani, MAT Electronics, B&D Enterprises, or Fox International, although Fox has sometimes delivered counterfeit chips (I don't think they knew they received fakes). OTOH parts supplies like Mouser, Digi-Key, and Jameco, aren't very good for TV parts.

You may be able to find a factory repair manual at ElektroTanya.com

TV-Forums.com has a TV repair forum that's very active.

[FriendlyFires]

Perhaps you do not have to replace the whole Power Supply -- if there are failed capacitors on the board, perhaps replacing the caps is all that is needed.

www.badcaps.net
well thats the problem, it still works intermittently, so the caps aren't completely shorted. i don't see any busted nor do i find any shorted using a multimeter. other that completely replacing every cap, i figured it'd be easier to replace the entire board.

[larrymoencurly]

well thats the problem, it still works intermittently, so the caps aren't completely shorted. i don't see any busted nor do i find any shorted using a multimeter. other that completely replacing every cap, i figured it'd be easier to replace the entire board.
According to the experts at BadCaps.net, some caps can go bad but still look good. I've had many bad caps measure OK with an ohm meter and some even measure within tolerance for capacitance. It seems the only fairly reliable way to screen caps is by measuring ESR, which requires a special instrument or an oscilloscope with an adapter (Google 99 cent ESR tester). If you can't test ESR or replace all the caps, try to get schematics of the TV or the power chips to see where the highly stressed caps are located (connected to MOSFETs or outputs of power chips). Typically those caps are rated for lower ESR or higher ripple current than other caps of the same capacitance and voltage ratings and may be the only ones that go bad.

Intermittent operation is often diagnosed by tapping on the circuit board with a wooden, fiberglass, or plastic rod, perpendicular to the board. Freeze spray can also be a big help for intermittents. Intermittent operation often means bad solder, so I'd redo every solder joint around the heavy components, high stress mechanical points (connectors, also heavy stuff), and hot stuff (power transistors & chips, large resistors, anything at darkened areas of the circuit board), first brushing a bit of rosin flux on each joint. Something else mentioned at BadCaps.net was that solder joints on transformer leads cracked. OTOH do not bake the whole circuit board or apply a heat gun to everything because that's likely to cause more damage than it fixes.