Burnt smell after turned TV off. Now TV never turns on. See no burnt capacitor, resistors, etc.
Hello,
I turned the TV off at night and tried to go to sleep. Everything was working perfectly with the TV and it had been working perfectly that way since I bought it(9 years ago!). After I turned it off for no more than 5 minutes, I heard a loud sound like something bursted (sounded like "pak!") and there was burning smell coming out too. I believe there was a flashing light coming out too -- but not sure because my eyes were closed and the loud sound may have caused the brain to imagine the flashing light. It was late at night and I figured it must be a blown capacitor or resistor. In the morning, just by curiosity, I tried to turn it on with the remote controller and it didn't turn on. No sound, picture, red indicator light, or relay clicking or anything. I tried to push the ON switch on the unit directly and there was nothing -- complete quiet. Obviously there was no power feeding anthing.
I opened the back cover, removed the circuit boards, and tried to find a blown component. I tried for a few hous but to my surprise, all circuit elements appear to be 100% inact! The only fuse in there is also not blown. There was no indication of what may have bursted at all. Everything looked clean or evenly covered with a thin layer of dust. The picture tube and the copper coil looked ok -- no burn, broken, or anything. Do you think it's the flyback transformer? Or anything else I should be looking at? I'm still wondering where the burning smell came from. Thank you!
Oh, and I made sure by unplugging and plugging it in. While plugging in, I observed a small spark at the outlet too (just like when you plug something in and you occasionally see a small spark). Looks like there was still power circulating on some part of the circuit. Thank you!Oh, and I made sure by unplugging and plugging it in. While plugging in, I observed a small spark at the outlet too (just like when you plug something in and you occasionally see a small spark). Looks like there was still power circulating on some part of the circuit. Thank you!
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Re: Burnt smell after turned TV off. Now TV never turns...
Yes what you discribe kind of sounds like a Flyback Transformer, like a light bulb at you house they've been known to go out when
you least expected it. I am not sure what make or model your TV
is, but many TV's use the Flyback Transformer to power other parts
of the TV, so when they go everything goes. You might look for any
cracks on the Flyback, this is a sure indication it is gone.
Electrolytic Capacitors can fail causing a loud hum in the speaker.
You Probably have a bad flyback transformer(The HI VOLTAGE) and a defective horizontal output transistor. I you have training in the tv repair , then you can go to http://www.partstore.com and getthese parts. they arte soldered in so your gonna have to know how to solder and unsolder as well. You should also know all the safety issues regarding the HI voltage in these sets. If you dont I highly advise that you take this set to a pro for repair as theres hi voltage inside these sets even when they are unplugged. Good Luck
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Hello. The chirping probably indicates a shorted transistor or diode, and the burnt smell usually indicates a blown capacitor or a burnt resistor, or multiple damaged parts. I would have to see the TV to be of any further assistance. Sorry I couldn't be more helpful. Good luck.
The problem is from the power panel of the television. It got burnt due to the voltage that hit the panel.
Mostly, it's a capacitor that gets burnt on the panel, so what you have to do is, open up the television with the appropriate screwdrivers and locate the power panel, it is attached to the main cord that is connected to the power supply.
Assess the panel, and check for the burnt capacitor that is on the panel, or you can as well replace them power panel.
After doing this, your television will be in good condition once again.
There is a burnt capacitor somewhere in the unit. Look for any burnt or swelled up capacitors. You can also usually locate a bad cap if there is burn marks on the system board. Also test power supply with voltmmeter to make sure it is a constant volt reading.
Do you smell anything burning. This happened to me and I cut it back on. It stayed on for 30 secs or so and did the same thing. After doing this 2-3 times, I smelled a burning. Being a member of the Fire Dept, I didn't want to see my buddy's coming to the house, so I unplugged it. The next day, I took it apart and there was a burnt resistor or something under neath the fan. I took it back and they gave me a new receiver, but I'm expecting the same with this one.
Burnt small 2KV capacitor near flyback xformer....original is
221K....I use 271K / 2KV ...Possible burnt 1K 1/2 watt resistor
and shorted zener diode ....ECG 519..................T.
Solder any / all bad solder connects.While doing that,Look for
overheated areas in power circuits,caused by bad capacitors,
resulting in burnt/open resistors,shorted diodes,etc,.........T.
Depends if you know about electronics and have SOME knowledge on how to fix them the user may well be able to source parts to fix them. Read WARNING below..
As suggested the fault could be FBT "Horizontal Output Transistor" (Check to see if shorted.) burnt out resistor or electolytic capacitor.
IF the FBT (Flyback transformer.) needs to be replaced you will want to know how to SAFELY discharge CRT HIGH VOLTAGE (WARNING CRT acts like a huge capacitor and may store around 25000Volts AND CAN KILL a person .) if unsure get qualified person to do repair.
By the way the term "No user servicable parts inside." is to keep most people safe from high voltages etc inside.
If you know where to go you can get all (Well mostly all) the parts you require.
Things to assist people to help:
Does your TV have self diagnostics? Ie. does standby led flash in a particular sequence. This will give a tech a 98% of correctly advising your fault.
If you open the case (Have good lighting.) you should be able to see a burnt out resistor with no problem as it will most likely be brown to black with unreadable color codes or value on it.
Write down the resistor PCB id eg R615 etc. (Same applies to Horizontal Output Transistor etc.) This will also assist a tech to provide correct information, and reduce the possible causes of fault..
ALWAYS remember if in doubt get a qualified person to do job.
Oh, and I made sure by unplugging and plugging it in. While plugging in, I observed a small spark at the outlet too (just like when you plug something in and you occasionally see a small spark). Looks like there was still power circulating on some part of the circuit. Thank you!
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