DIY Notes And Precautions

Important Notes about Fault Diagnosis in LCD, Plasma Television




A Few Usefull Tips For the DIY Person



While the majority of our Customers are service shops and trained technicians looking for alternative sources to parts no longer supplied by the manufacturer's,  equipment owners are gradually becoming aware of the high costs involved in having a Plasma or an LCD television repaired by a professional service facility  and are also starting to look for alternative ways to get their non working equipment repaired, and of course the easier way around this is a DYI Repair


A few Years ago with only CRT Television being around, DYI Television repair was considered unthinkable, as most CRT televisions did not offer the easiness of just replacing PCBs, and a CRT Television itself can be a lot more dangerous for the inexperienced if not repaired or readjusted  correctly, excessive High voltages and their effects on  radiation cannot by measured by the average DYI person as specialized equipment beyond their reach is needed .


However  with Plasma and  LCD Television repair,  things are now different


Unlike the one part PCB of the CRT TVs of the last decade, modern televisions have complete modular design, different PCBs are used for major functions, this has already reduced the need for highly trained service personnel at professional service facilities, after all undoing a few screws and replacing a PCB, cannot be considered as a task requiring high technical skills, getting to know  the theory behind  the actual PCB operation  in order to correctly diagnose the initial fault, or repair it to a component level, is another story of course, and not many do bother to get involved with it.   


Forums and Social media are frequently becoming places of technical discussions about plasma or LCD television repair, for this latest generation of  evolving Customers we have to give the following few advices in order not to waste any money without reason



Diagnosing a fault in a modern day television, takes a lot more than advices given by friends or forums, most of the time these suggestions lead to unnecessary spare parts purchases and waste of money and efforts, usually the part(s) suggested fail to correct the problemr


For Example a wrong colors picture in a LCD TV may be caused by a faulty LCD Logic control PCB ( T-CON ) but it may as well be caused by a faulty LCD panel itself, or by a faulty color decoder PCB ( Main PCB ) or even by just a cold solder joint, another example is a non working ( dead ) set, where the power supply section is the first to blame, but the no power on can also be caused by the microprocessor not giving the correct power on signal due to a corrupt memory chip contents,


Purchasing the parts, in the first case  a T-CON PCB to fix the above problem just because you have read in a forum that someone did repair a TV by replacing this PCB, in the second case a power supply PCB just because it is the first suspect for non working equipment, both cases may turn up to be expensive errors, because parts purchases were based on suggestions, not on any diagnosis, unfortunately electronic equipment cannot just be repaired by suggestions, only a person experienced in repairs and having all the required test equipment can make a correct diagnosis, and even then, the wrong diagnosis tolerance cannot be zeroed



Please READ The Notes Below Very Carefully




So our Suggestion is DO NOT TRY a DYI Repair  unless you know very well what you are doing



And you are also ready to accept full responsibility for your work and for any mistakes by wrong diagnosis, otherwise try to find a professional service center to get the job done .


Besides wrong diagnosis errors, electronic equipment may contain lethal voltages even when disconnected from the power source, electrolytic capacitors may take several minutes or even hours to discharge completely and the discharge from a short may give a person with a heart problem a lethal shock

Another evolving problem is caused by those who are trying to repair a TV  by replacing Just about every board in sequence, trying to locate the fault,  and while in the process causing damages to parts by wrong handling, wrong fitting, or mismatching, and then complaining that the supplied parts were faulty


And while it may be true that some opportunity sellers usually completely unrelated to electronic parts handling or any repair practices, are trying to sell untested or even faulty parts to customers, usually via ebay, you cannot blame a reputable business for your faults or misdiagnosis


Qservice electronics has been established in the repair business for more than 30 years now,  we have a fully equipped professional service facility, repairing consumer electronics and Tektronix electronic test equipment


We are not Junk yard sellers, and we are not in any way associated with electronic equipment recycling


Customers who are not willing to pay the high bills associated with expensive repairs like replacing a broken LCD or Plasma panel, just prefer to buy  a new television, and trade-in their old set, this is our main source for our used PCBs and parts


However, as the components used in modern power supplies or any other high power related board are not really as hi quality ( especially Electrolytic capacitors ) as  used to be several years ago, all PCBs, even if the equipment taken from was working fine, need to go thorough inspection, testing, and possibly reconditioning before they can be considered as fully working and be guaranteed as such, after any such reconditioning work is completed, all boards are re-tested under actual operating conditions ( we do have several sets in our workshop just for testing boards ) voltages, ripple, component overheating checked, and only after PCBs pass through this successfully, can be considered  as fully working and be guaranteed


As you may understand this process takes a lot of time and as we use high quality parts for all repairs, the boards we supply are not as cheap compared to those you may find from junk yard sellers, after all the junk yards do not have any work to do except to pick up the set from garbage and take the parts out, no actual testing at all, regardless of what they may claim....


If you are after those cheap bargains, please go elsewhere to get  them


Otherwise, Qservice Electronics is your place of Choice for tested and guaranteed LCD & Plasma television Parts


All  used boards we supply have a special tamper proof uniquely serialized label, this unique serial number is fed to our parts database as soon as the PCB is taken out from a television, this way we know where the part was taken from, what work was done to it, parts replaced if any, etc, etc, this number is mentioned in all invoices and is the basis for any  guarantee given, the label must remain intact for our guarantee to apply,  removing or defacing the serial number, Soldering or de-soldering components from boards VOIDS the Guarantee.


If you need to return any parts because of wrong diagnosis a  Retest - Restock fee will apply,   


Please ask questions, support will answer any questions, concerns, or complains as soon as possible







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