Re: Samsung LCD TV Q1820-Q1821 mosfets blown

Thank you very much for the info budm.
I have the mosfets on order and will carefully check other Capacitors on the board and replace if suspect.
Not sure if I will get into the SMD level replacing. TV is about 10 years old and may become more problematic.

Re: Samsung LCD TV Q1820-Q1821 mosfets blown

Ok, done, couldn't find the upload option yesterday.
Photo's attached....

Re: Overvolting/reversing a polymer cap

I am in for blowing stuff up. Have 240-270 Volts with 32 Amps with 35 Amp variac to test with. Cap bank with 5 x 20 UF 6.6 kV Caps, but 14 Caps in total. Then 630 Volts at around 10 Amp to experiment with. Did a TV test with an old CRT TV which worked up to nearly 500 Volts AC.
First smoke the TV out with some smoke tablets, then ramp up the voltage to 320 and 420 and 490 Volts till the TV popped. great fun.

[url]https://www.youtube.com/watch?v=mnMnOn_uU8U[/url]Re: Overvolting/reversing a polymer ... <br /> I am

Re: Samsung LCD TV Q1820-Q1821 mosfets blown

Thanks budm for your reply. you do know your stuff re codes etc.
Some pics attached via flickr.
hope they work

[url]https://www.flickr.com/photos/30448173@N04/32072934637/in/dateposted-public/[/url]

[url]https://www.flickr.com/photos/30448173@N04/40049602103/in/dateposted-public/[/url]

[url]https://www.flickr.com/photos/30448173@N04/32072934607/in/dateposted-public/[/url]

[url]https://www.flickr.com/photos/30448173@N04/40049601863/in/dateposted-public/[/url]Re:...

Hello, Just trying to repair my sons LCD TV which stopped working. Samsung T370HW03
Found the 3.15 Amp fuse blown ( FM802S ).
Nothing obvious like bulged electrolytics or toasted R's or burnt tracks.
Did a recheck with a 500 Watt lamp in place of fuse FM802S to limit current to 2.5 Amps, something lit up on the board which I captured on video camera.
That appeared it was Q1821 mosfet.
Testing the mosfets and they appear shorted out on the diode tester.
There are SMD R's on the other side of the board which look alright, and I have never removed those as they...

Re: New Members - please post your introductions here

Hello, I am a new member from New Zealand and just joined a few minutes ago.
My name is Raymond
A bit about myself. I am a registered electrician, and work in the High Voltage industry for the local power Authority in Auckland, NZ.
I have been doing electronics for about 48 years since I was about 10 years young.
It started with a small 7 watt tube amplifier with EL84 tubes, various TTL clocks, transistor amplifiers, reel to reel tape decks.
I am involved in other forums as well to share and...