Saturday, July 11, 2015

Electronics (TV) Repair, Working at Amazon, and Dealing With a Malfunctioning Apple iDevice

I obviously do component level electronics repair from time to time (I've been doing electronics repair/modification since I was fairly young on devices ranging from food processers all the way up to advanced electronic component level repair such as laptops). One of recent experiments was with large screen flat panel (Plasma, LCD, LED, etc...) television sets. Some general notes:

- take precautions. If you've ever watched some of those guys on YouTube, you'll realise that they are probably amateur electrcians and have probably never been shocked/electrocuted before. It's one thing to work with small electronic devices. It's an entirely different matter to be working with mains voltage. Be careful...
- a lot of the time electronic failure will take occur gradually over time (although the amount of time can vary drastically obviously)
- don't just focus on repairing it so that power can flow through the circuit once more. It's possible that it will just fail once more. Home in on the problem area, and make sure everything's working. That way you don't have to keep on dealing with other difficulties down the track
- it may only be possible to test components outside of circuit. While testing components with a multimeter will help you may need to purchase more advanced and expensive diagnostic equipment to really figure out what the true cause of the problem is
- setup a proper test environment. Ideally, one where you have a seperate circuit and where there are safety mechanisms in place to reduce the chances of a total blackout in your house and to increase your personal safety
- any information that you take from this is at your own risk. Please don't think that any of the information here will turn you into a qualified electronics technician or will allow you to solve most problems that you will face
- a lot of the time information on the Internet can be helpful but only applies to particular conditions. Try to understand and work the problem rather than just blindly following what other people do. It may save you a bit of money over the long term,-reboots,-or-the-standby-light-is-blinking
Philips 32PFL5522D/05 - Completely dead (no power LED or signs of life) - Diagnosis and repair
how fix tv
- electronics repair is becoming increasingly un-economical. Parts may be impossible to find and replacing the TV rather than fixing it may actually be cheaper (especially when the screen is cracked. It's almost certain that a new replacement is going to cost more than the set itself). The only circumstances where it's likely to be worth it is if you have cheap spare parts on hand or the type of failure involves a relatively small, minor, component. The other thing you should know is that while the device may be physically structured in such a way to appear modularised it may not fail in such a fashion. I've been reading about boards which fail but actually have no mechanism to stop it from bleeding into other modules which means you end up in an infinite, failure loop. Replace one bad component with a good one and the leftover apparently good component fails and takes out the new, good board eventually. The cycle then continues on forever before the technician realises this or news of such design spreads. You may have to replace both boards at the same time which then makes the repair un-economical
- spare parts can be extremely difficult to source or are incredibly expensive. Moreover, the quality of the replacement parts can vary drastically in quality. If at all possible work with a source of known quality. Else, ask for demo parts particularly with Asian suppliers who may provide them for free and as a means of establishing a longer term business relationship
- be careful when replacing parts. Try to do your bet to replace like for like. Certain systems will operate in a degraded state if/when using sub-par replacements but will ultimately fail down the line
- use all your senses (and head) to track down a failure more quickly (sight and smell in particular for burnt out components). Sometimes, it may not be obvious where the actual failure is as opposed to where it may appear to be coming from. For instance, one set I looked at had a chirping power supply. It had actually suffered from failures of multiple components which made it appear/sound as though the transformer had failed. Replacement of all relevant components (not the transformer) resulted in a functional power supply unit and stopping of the chirping sound
- as with musical instruments, teardowns may be the best that you can get with regards to details of how a device should work. This is nothing like school/University where you are given a rough idea of how it should work. You may be completely blind here...
- components may be shared across different manufacturers. It doesn't mean that they will work if swapped though. They could be using different version of the same base reference board (similar to the way in which graphics, sound, telecommunications, and network cards rely on reference designs in the ICT sector)
Magnavox has a very similar layout to a similar size Phillips LCD TV

Apparently, Amazon are interested in some local talent.
There are some bemusing tales of recruitment and the experience of working there though.,21.htm

If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on. If your device is in a lot of trouble I often just run the following command on the storage, 'dd if=/dev/zero of=/dev/[iPod storage node]'. This will create a corrupted filesystem and force restoration of the iOS to factory settings/setup.

Sometimes digitizers play up. Apparently, a lot of strange behaviour can occur if certain cables are bent improperly or if there isn't enough space/insulation between certain components.

Identify your iPad model.

If your device is suffering from device corruption issues you may need to backup your music first...

A lot of substances can be used to remove scratches from your electronic device. Some of them not so obvious in the way that they actually work (solvents and abrasives are the most common techniques that are used).

Life in Vietnam 2, Data Recovery Work, and More

This is a continuation of my other post: - more Yo...