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Samsung FP-T5084 died. Going to fix it myself. Need some help...

WaltonsMountain 820 34 July 24, 2011 at 05:57 PM
So either one fo the fuses is bad or the power board itself is bad, but my Samsung FP-T5084 is dead. After doing alot of readin on different forums it seems its a common problem with this model. I've had it for 3 years and am now out of warranty. This is the 2nd time this has happened since i've had the tv (luckily, the first time it happend a year and half ago i was still under warranty). Because of this fact i'm planning on fixing it myself to save some money. I need a tool to test the fuses first.

Price is my main concern here... I need to know what kind of tool i need and the cheapest place to get it.

Thanks.

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#2
7 Function Digital Multimeter [harborfreight.com] = $3 + tax @ Harbor Freight
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#3
Quote from KO3bIPb View Post :
7 Function Digital Multimeter [harborfreight.com] = $3 + tax @ Harbor Freight
Thanks...went ahead and got one. Hard to beat a multimeter for $5.34 shipped. Hopefully this does the job. Big Grin
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#4
Quote from WaltonsMountain View Post :
Price is my main concern here... I need to know what kind of tool i need and the cheapest place to get it.
That's as cheap as it's going to get.
In the other forums, how are they testing the fuses? Will you be looking for voltage at each side of the fuse, or checking for continuity? Just curious.
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Quote from In_Like_Tim View Post :
That's as cheap as it's going to get.
In the other forums, how are they testing the fuses? Will you be looking for voltage at each side of the fuse, or checking for continuity? Just curious.
Basically in the youtube video i saw the guy checked the fuse for continuity...replaced the fuse and it worked. I'm hoping its the same for me.
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#6
Quote from WaltonsMountain View Post :
Basically in the youtube video i saw the guy checked the fuse for continuity...replaced the fuse and it worked. I'm hoping its the same for me.
That would be nice. I hope it's a nice cheap fix for you.
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#7
have you checked the capacitors? a while back samsung was using shitty caps and they tended to blow.
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Quote from mrbobhcrhs View Post :
have you checked the capacitors? a while back samsung was using shitty caps and they tended to blow.
I haven't checked anything yet... I have to wait on this multimeter. I dont know anything about tv electronics so i'm sure this will be fun.... Frown
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Quote from WaltonsMountain View Post :
I haven't checked anything yet... I have to wait on this multimeter. I dont know anything about tv electronics so i'm sure this will be fun.... Frown
while you wait i would open up the back and check the caps, i got a tv for free and fixed it and it was just $10 in caps. you are looking for something like this [roshd.ir] that is bulging or leaking. Also unplug the tv and leave it unplugged for a while there is some high powered crap in there.
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#10
Quote from mrbobhcrhs View Post :
while you wait i would open up the back and check the caps, i got a tv for free and fixed it and it was just $10 in caps. you are looking for something like this [roshd.ir] that is bulging or leaking. Also unplug the tv and leave it unplugged for a while there is some high powered crap in there.
Thanks, i'll definitely check this out too. Do I need a tool to check capacitors or am I just looking for any sort of leaking?
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#11
Quote from WaltonsMountain View Post :
Thanks, i'll definitely check this out too. Do I need a tool to check capacitors or am I just looking for any sort of leaking?
more looking for bulging or leaking. Did it happen to give you issues turning on. as in would it slowly take longer and longer (almost like it had to warmup) and maybe start this clicking thing when your turned it on.
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#12
Quote from mrbobhcrhs View Post :
more looking for bulging or leaking. Did it happen to give you issues turning on. as in would it slowly take longer and longer (almost like it had to warmup) and maybe start this clicking thing when your turned it on.
Nope, absolutely no signs whatsoever. Was watching tv w/ my son on Sunday afternoon and all of a sudden it shut off and wouldn't come back on. Tried multiple variations w/ the plug ins and the power strip and finally deduced that it was either a bad fuse or the power supply itself once again.
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#13
Quote from WaltonsMountain View Post :
Nope, absolutely no signs whatsoever. Was watching tv w/ my son on Sunday afternoon and all of a sudden it shut off and wouldn't come back on. Tried multiple variations w/ the plug ins and the power strip and finally deduced that it was either a bad fuse or the power supply itself once again.
Capacitors can go bad even without showing outward signs, and the usual test done with a multimeter, where it's set to ohms to verify that the resistance gradually rises as the meter charges the cap, is only good for finding really, really bad caps, such as those that have shorted. Even a capacitance meter (many higher priced mulitimeters have that function) isn't very useful, and it really takes an ESR meter to verify that caps are OK.

Maybe the problem isn't capacitors but solder connections or shorted diodes or transistors. Generally, solder is most likely to crack around the most physically stressed parts, like connectors, heavy components, and hot components, which include transformers and high power transistors, diodes, and chips. The latter three are often connected to electrolytic capacitors and can be killed if those capacitors go bad. Also one expert recommended always soldering the leads of any transformers. A multimeter can test transistors, diodes, and sometimes even power chips (their output transistors. Also some of those chips are just pairs of transistors). All testing can be done with the AC power disconnected.

It's possible a capacitor located somewhere other than the power supply has failed, and many circuit boards have their own voltage regulators, which are typically much smaller and use tiny coils.

BTW, Samsung's own capacitors aren't considered very good, and it's better to use a Japanese brand, like Sanyo/Sun, Panasonic, or Nichicon. The electrical characteristics should be the same, not only in voltage and capacitance ratings but also ESR and ripple current.

BadCaps.net has loads of information and forums dedicated to just monitors and TVs.
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#14
Quote from larrymoencurly View Post :
Capacitors can go bad even without showing outward signs, and the usual test done with a multimeter, where it's set to ohms to verify that the resistance gradually rises as the meter charges the cap, is only good for finding really, really bad caps, such as those that have shorted. Even a capacitance meter (many higher priced mulitimeters have that function) isn't very useful, and it really takes an ESR meter to verify that caps are OK.

Maybe the problem isn't capacitors but solder connections or shorted diodes or transistors. Generally, solder is most likely to crack around the most physically stressed parts, like connectors, heavy components, and hot components, which include transformers and high power transistors, diodes, and chips. The latter three are often connected to electrolytic capacitors and can be killed if those capacitors go bad. Also one expert recommended always soldering the leads of any transformers. A multimeter can test transistors, diodes, and sometimes even power chips (their output transistors. Also some of those chips are just pairs of transistors). All testing can be done with the AC power disconnected.

It's possible a capacitor located somewhere other than the power supply has failed, and many circuit boards have their own voltage regulators, which are typically much smaller and use tiny coils.

BTW, Samsung's own capacitors aren't considered very good, and it's better to use a Japanese brand, like Sanyo/Sun, Panasonic, or Nichicon. The electrical characteristics should be the same, not only in voltage and capacitance ratings but also ESR and ripple current.

BadCaps.net has loads of information and forums dedicated to just monitors and TVs.
If I dont see a capacitor leaking or bulging, a fuse blown, or some other obvious problem i'm replacing the power board (the problem the first time this occured)... if that still doesn't fix the problem I may have to get rid of her. I'm not a tv repairman. lol.
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#15
Quote from WaltonsMountain View Post :
If I dont see a capacitor leaking or bulging, a fuse blown, or some other obvious problem i'm replacing the power board (the problem the first time this occured)... if that still doesn't fix the problem I may have to get rid of her. I'm not a tv repairman. lol.
Soldering bad joints and using an ohm meter on semiconductors don't require anything close to the skills of a TV tech.
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