REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday, 8 April 2020

FINDING THE INTERMITTENT FAULT ON ELECTRONIC CIRCUITS

Intermittent in electronic repair definition means sometimes equipment will work and sometimes not . Intermittent problems can occur in any conductor and in every electronic circuit . If you found error ( for example , sometimes display sometimes not ) Laptop work properly throughout the day without any problems and can last for a day and did not have a chance to see the error .
 However , sometimes the laptop does not work at all .
First think to do is updating Bios by executed new revision of Bios.exe .ensure adapter and battery in use when updating Bios.

Intermittent problems big possibility caused by dry joint , broken tracks , loose connection / cracked/ bad conductor area ~ Bad components / crashes and etc. .
This is a problem that has led to many electronic repairers become frustrated and if it does not have a better way to solve the problem and may be losing valuable time .

Observing for each solder connection to all circuit ' . Looking for some small cracks around the solder pad. If you can not see the dry joints , Power On motherboard and gently tapped the motherboard ( or suspected area ) with the handle of a screwdriver .Usually, the line circuit / track will not break by itself , Moreover, since the intense price competition , Laptop motherboard made thinner with less conductor material to reduce the cost of production . Problems can arise when the chips repair ( reballing / replacement) .

Broken circuit track and obvious dry joint during reballing process could be happen when we use unstandard BGA tools . This could be due to overheating , unpresition center board , bad flux or errors in the method of repair / desoldering chips .Decayed glue ( glue decay )Decay glue can conduct electricity , it has the ability to create an intermittent problem in electronic circuits , shorting of components that are located close to the glue that rot . For information , I have seen the glue that lies rotting under BGA chip and could not removed .
 We can not see the glue rot from the top and should pull BGA off from circuit to check.Splash of acid -containing beverages ( soft drinks or coffee ) to the electronic circuits . can lead to complete failure in electronic circuits besides error can intermittent.damage the components and pathways ( conduction ) . although it can be cleaned with the of Thinner , the circuit will be unstable and cause problems including intermittent fault .

Each component : Integrated circuit (IC) resistor, Semiconductors ,inductors, Capacitors , Crystals etc can cause intermittent problems in electronic circuits if not properly etched . This can cause damage to fully or sometimes works and sometimes does not .

Easy way to make whole motherboard component properly etched,heats up to the boiling point of lead using Oven .Cooking oven will be an alternate if you don't have special electronic circuit oven.
Posted By: FRANK at 08:15
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