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I want to know why most of our engineers to know how to troubleshoot a circuit board diagrammatically ?

That is just how to do a perfect repair on any motherboard

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It's the technique used, essentially the power flows through a circuit like a hosepipe, if it's blocked at one point by a fault then it won't carry on down the rest of the pipe.
Circuits have a point of entry and exit so it's a natural thing to check from source to exit to find an issue

Posted on Nov 11, 2014

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Posted on Jan 02, 2017

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Nordic T20 Works for 25 minutes then stop working.Circuit board led comes on, but no consol power and no function at all. I do not have circuit diagram to fault find. Thank you!


Hi There, well, it sounds like your motor control board is failing due aging capacitors. Using the unit like this can lead to complete failure and possibly costlier repairs. You can find repairs and refurbs for treadmills by emailing gregATbuyfitnessrepairpartsDOTcom as well as for additional help. There is a power supply circuit on the control board that provides power to your console, if your console goes dead, as in no lights or beeps, the power supply is failing when warmed up. Good Luck!

Feb 07, 2016 | Exercise & Fitness

2 Answers

Engine light bulb


Ford Dealers and repair facilities do not repair circuit boards they replace them. Ford really does not provide a way to test circuit boards. If it is a LED it would be very rare that it is defective. The circuit or the processor that turn the light on would be suspect. A pin out test of the circuit would be the first step this would include checking the wire for continuity from the board back to the processor 5 ohms or less is the standard. When in KOEO (key on engine off) mode power is sent to one side of the led the processer is powered up and supplies a ground to the other side of the LED.
The pin out test confirms a connection. I would suspect first a chafed/broken wire. Look close to the processer out follow the wires where they turn look close on the inside of the turns where they are close to other objects.

Apr 14, 2014 | 2002 Ford Escape

1 Answer

Circuit board attached to ps is broken into two, Where do I get another or can I repair it successfully?


It depends on how complex the board is. I have repaired many a board in my 40 years and they all worked perfectly. Power supplies are not that difficult as the circuits generally are pretty straightforward and not real complex. The board should be put together and epoxy applied to the component side then when it is cured the foils could be reconstructed or patched over with 30 gauge telephone type wire- thicker if the foil indicated the need for more current. If you can not do it see Skywave Tape deck Repair in Chicago.

Sep 10, 2013 | Audio Players & Recorders

1 Answer

Meaning of warning lights


Manufacturers spend billions of dollars a year refining their cars' on-board diagnostics systems. However, all of the sophisticated diagnostics in the world will do little good if you don't know what the warning lights mean.
Purpose
Modern automobiles have dozens of sensors to monitor engine, braking and chassis performance. Any deviation from the car's established limits will trigger a dashboard warning light.


Check Engine Light
Check engine lights can indicate failure of the emissions system, fuel injection system, faulty sensor feedback, overheating or lack of voltage, transmission failure, and engine knock ignition system failure.


Brake Lights
Almost all cars have two separate lights for the braking system: a red "ABS" (anti-lock braking system) light and "Brake Warning" light. The former indicates failure of the electronic anti-lock system, the latter a loss of fluid pressure in the brake system itself.


Dynamic Warnings
Many modern cars have traction or stability control systems that prevent and notify the driver of tire slippage. These lights can come in the form of amber "SLIP," "TC," or "TRACTION" lights (for spinning tires), or "ESC" (electronic stability control) lights for a sliding vehicle.


Safety Lights
Most cars have a diagrammatic warning that indicates a door that isn't all the way closed, a seat-belt warning light, and an "airbag disabled/enabled" light. Any or all of these will be red or amber.


Read more: Car OBD2 diagnostic tool

Jul 25, 2012 | Cars & Trucks

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I have a GE 27GT624. The picture is perfect but the sound went out. Both speakers work fine when hooked up to something else. The circuit board looks like a resister and an E-prom chip has tan burn marks...


The epprom chip is most likely the problem, the tuner shield will need to be resolded to the main circuit board because over time it developes hairline cracks causing the epprom to fail in a variety of ways. The chip needs to be replaced and programed along with tuner shield repair, I don't think there is a board option replacement.

Dec 20, 2010 | GE 25GT240 25" TV

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Mordaunt Short MS409W cuts out. I think due to oversensitive overtemperature sensor on the heat sink. Some of the components (two electrolitic caps and a choke) close by look to have become very hot. With...


I read about lots of similar 'cutting out' problems on other bulletin boards, revealing that this is a common problem with this particular model. Many people had the faulty speaker replaced or repaired, then had a similar problem with the new one. As the manufacturer doesn't seem to have taken any responsibility for it and as I am an Electroinic Repair Engineer, I decided that I needed to find a creative solution.

I read lots of reports about fuses blowing as the wrong rating had been fitted by the manufacturer and reports of people fitting uprated fuses (very dangerous) after the higher rated fuses had blown. People often still had the same cutting out problems after doing this. I then found a 'fix' carried out by someone who clearly had a very rudimentry grasp of electronics but nevertheless claimed to have found a cure for this problem. I decided to check out this 'fix' which consisted of adding a link between two points on the power supply circuit board. This is the circuit board covered in black heat shrink sleeve.

I examined it and found that it contained a relay that transfers the secondary voltage from the turoidal transformer to the larger, circuit board. The relay appears to be responsible for switching through the primary positive power supply voltage for everything. So, by shorting out the input to the output, the electronics is no longer dependant on the relay operating to keep the supply going to the main circuit board. I figured that it could be the relay causing the 'cutting out' problems which is why the writers 'fix' worked.

I carried out this modification to the speaker I was repairing and as far as I can see it now works perfectly. The 'fix' does of course mean that the power is never removed from the main circuit board even if it is supposed to be, say for a 'soft start' or similar. Of course, since the speaker was basically scrap as it would have been to expensive to obtain and replace the faulty parts, this repair means that my customer now has his speaker back for very little cost.

If you at FixYa would like the full details for this repair, I will only charge you a one off fee of £80 for the several hours I have spent working on this solution. Of course I am perfectly happy to make the information available free to any member of the public or non-profit organisation that would like it. After all I only really checked out the repair that someone else had posted to make sure that it was reasonably safe and that it worked. No guarantees.

****

Jan 29, 2010 | Audio Players & Recorders

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Need Location of Part # on right front circuit board (if looking at it from the back of the tv) I just finished soldering in new IC heat-sinks on this board and set on top of TV and a cat jumped on it...


I think you will find the board for this set is not available or if it is not at a reasonable price.

Usually if a fairly small part of the board is broken off it can be repaired-----I can tell you what is involved in this type of repair if you give me some idea of how bad the damage is.

I have repaired circuit boards broken in half---once fixed they are not pretty but will work perfectly.

let me know if I can help you--I am here to help.

SD TECH

Oct 09, 2009 | Pioneer SD-533HD5 53" Rear Projection HDTV

2 Answers

Tood my D52W20 to Repair man and he said not worth fixing.


The repair man doesnt know RCA 's very well. The 3 x then out power led is the classic sign of the flyback and cp150 needing to be replaced. You need the flyback # 259296 and the CP150 you can get the flyback and cp150 at the following link with free step by step instructions with pictures on how to do the repair. Its very easy. Heres the link.
http://servicemanuals.vstore.ca/

Mar 03, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

3 Answers

No power problem.


I just got done fixing an Akai LCT2660 that had four bad capacitors on the power board.Works perfect now.Hope this helps.Thank You very much!

Tyler

Oct 19, 2007 | Akai LCT2660 26 in. HD-Ready LCD...

1 Answer

MY Samsung HCN4226W have perfect sound but no picture


I had the same experience with my set. I noticed there were 2 new cables attached to the new board and looking carefully noticed the connectors were different from the old. The new connector fit perfectly into the new board but wasnt the same as the old. I replaced the old cable with the new and the TV remained bad. I then flipped the connector to the main circuit board (bottom left) and the new board worked fine. I know nothing about Tv repair, but this new cable seems to be a universal connector in which the contacts are open on 2 sides...allowing them to be flipped if necessary. Now if I could get that solid line out of the display I'd be set!

Nov 05, 2006 | Samsung HCN4226W 42" Rear Projection...

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