ok i have been working on tvs for about 2years and is now full time shop and i do good, i still am learning some things and get some hard tvs here and there that its harder for me to beat, like the older ones with mains and digital mains and such. but im pretty good at diagnosing a tv and using a multimeter to swap boards out and do small repairs on power supplies and surface mount components that i can tell are bad, but i have never see or even used a Oscilloscope can anyone tell me what this will do and how it will help me?
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Re: can anyone tell me how a Oscilloscope will help me?
I have used my Rigol DS1074Z hundreds of times.
- can trace audio faults
- check power supply stability
- check if voltage regulator oscillating
- check LVDS signal to rule out main board or tcon
- check buck/boost converter is working on LCD Tcon
- hundreds of tests on plasmas (you only need to see how often I ask if someone has one...)
- input current measurement using ac clamp transformer can tell you if PFC is working
An oscilloscope is only as good as the user. You need to know what you're looking for.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search. -
Re: can anyone tell me how a Oscilloscope will help me?
When I can't get further with the DMM, I use my 100 Mhz scope to visualize thing and help me troubleshooting the fault. I mostly use it on audio circuits, power supplies, TV's, Ham Radio and broadcast equipment. For me I sure have to have one.Comment
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Re: can anyone tell me how a Oscilloscope will help me?
That also applies to a multimeter.
I saw one youtube video posted yesterday where the user attempted to show how to use a multimeter. The person set the rotary knob to 2A and then proceeded to stick the probes into a power outlet to try and measure 120V AC.
The same can happen with a scope as Dave Jones explains and this repair video.
https://www.youtube.com/watch?v=xaELqAo4kkQ
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Re: can anyone tell me how a Oscilloscope will help me?
Not to mention diagnosing intermittent faults. I can't tell you how many times I gave up on a board which had some random issue which would make it cut off, but then it would be fine again when turned back on. A deep memory scope would allow you to see what happened just before it cut off, determine which circuit is causing the fault, and locate the particular component which is causing the fault.------------signature starts here------------
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Hi,
I've been living in the same apartment for about 5 years now, and moved into it with my old Samsung plasma TV (PS51F5500).
Ever since we've moved in, we would sometimes see strange power-cycling behavior. For example:- TV would randomly turn off then back on.
- TV would turn off and the LED light would blink for a while (over a minute sometimes) until eventually it went back to a regular off state and could be turned on
- Sometimes it would require disconnecting the mains cord from the TV, waiting several minutes, then putting it back in and turning the TV back on. This had limited
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Hello.
I have jut got my first analogue oscilloscope. An Isotech 620 20MHz.
I want to learn how not to damage it, and I found instructions on the internet obscure.
They talk about ground, earth, floating ground, this, that....
But they don't actually say anything anything useful so far.
I want to know:
Don't connect exactly this to exactly there or it blows up.
For example, I am tracing a signal from a function generator in an audio amp, or testing for voltages in different parts of a circuit.
I want to know what not to connect... -
I have recently acquired a Dynamco D7100 analogue oscilloscope without a user manual. As this is the first time I have owned or used an oscilloscope I would like to try and find an instruction book. The manufacturers no longer hold any information and a Google search only found one site but when I downloaded a 'service manual' all I got was gobbledegook. Any help would be gratefully appreciated or even pointers to a generic manual where I could learn more. -
All,
Some of you have helped me in the past and I am very appreciative of all the help! (I have fixed TVs/Stereos/ and other small appliances with your efforts...Thanks so much!!!
Today I went to a local HAM Radio Festival. It was one of the smaller ones in our area. My stepfather is the HAM operator. I tinker in electronics but am a Software Programmer (27 years now).
I was looking for a few odds and ends for some electronics work I have to do for the household/farm. Typically these type of shows have the grab bags or a electronics vendor... -
Hi, i have a Lenovo S145 that after 20 seconds shutdown and restart (it's working correctly on thse 20 seconds)
everything seems ok, but on Vcore inductor ( this is an i3 with just 1 switching power supply for CPU)
there is an output to teh CPU with a spike.. seems that inductor can't handle the input...
replaced the capacitor (330) and the inductor (R15) without any change
any idea? very thank you!
input of the inductor seems as usual... only strange thing is that the upper/lower voltages seems to be 21V (main power line is 19.3) ... but not sure this...
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