Hi everyone!
I happened several times, in the search for help from the web, to consult this very interesting forum.
So I decided to sign up and I intend to participate actively by making available my knowledge and experience on the subject, I'm a new user but at the same time I'm old in the sense that I have 4 decades of experience in repairing and designing electronics but above all I'm a great passionate about the subject.
Having said that I come to the gist of my post on the forum as the title suggests.
For my passion for technology I'm now collecting several Panasonic plasma TVs.
I think the image of these devices is superlative and even considering the era of their launch on the market, they are still difficult to beat in terms of reproduced image quality.
I can afford the "collection" as this generation of Panasonic plasma TVs are found at very low prices also because I buy them broken in order to repair them purely for personal satisfaction.
The more you go on with the years, however, the spare parts are increasingly difficult to find and those who have them (I'm talking about complete boards) ask for astronomical amount!
So I wonder why, as a technician, I have to change the entire board when perhaps the problem is (I say things at random) a transistor or a capacitor worth a few cents that is the cause of the failure???
Unfortunately, however, this professionalism is disappearing, all you do is change whole boards and throw them in the trash, or faced with absurd amount, you make the decision to throw away and buy the new model again, no one knows how to use a welder and read an electrical diagram anymore to understand the source of the problem.
In a period like the current one of attention to the environment, I think it is better to repair instead of constantly changing equipment, landfills are overflowing with electronics which in the vast majority of cases could have a new life with the intervention of a repair technician.
I am addressing the technicians of my generation, I graduated (almost 40 years ago, I also have some gray hair!) as a radio TV repairer, I come from the school of cathode ray tube TV (CRT), a era when it was much easier to fix everything.
I understand that SMD technology scares a little but the underlying electronics are always the same, you just need to put a little more effort into it then many boards, with the right equipment, in my opinion, can be repaired.
Specifically, Panasonic provides the service manual which is not bad but the diagrams, at least in the versions that I have found, are "blurred", not very legible and often some parts are missing, such as the power supply.
I therefore ask for help from someone on the forum who, by profession or other channels, has or is able to provide more information than what is found on the web.
Specifically I would like to have, if they exist, procedures to better understand where to sift through the schematic to find the fault.
I'll give an example referring to the title of the post: LED with 3 flashes (TX-P50VT50T, I have two with this problem).
The service manual says “IROM BOOT PROGRAM SOS”, change board “A” (main board) and/or “P” (power supply).
But damn! Can't you elaborate on what this “IROM BOOT PROGRAM SOS” means???
Perhaps by powering the card externally, bypassing some checks, in order to guide the technician to the origin of the problem.
From what I was able to decipher on the blurred wiring diagrams I checked all the voltages on board "A" (5-3.3-1.8-1.2-1.1) and for a moment, when switched on, they are present then the TV goes into protection and flashes the LED, Vsus and Vda are not shorted, only F15V (15.6V) and the standby 5V (which in my case are 4.4V) remain permanently present.
I don't believe in self-diagnostics, for me it complicates things and doesn't help solve the causes of the fault, perhaps my opinion clashes with the Panasonic designers but I would just like to have the possibility to investigate further to find out what is broken instead we change the board (which will most likely break again, planned obsolescence) and so we produce waste after waste!
I hope this speech of mine will interest someone, I thank those who have had the patience to read me up to here, sorry for the inaccuracies of English which is not my native language, I got help from Google to fill my gaps…
I happened several times, in the search for help from the web, to consult this very interesting forum.
So I decided to sign up and I intend to participate actively by making available my knowledge and experience on the subject, I'm a new user but at the same time I'm old in the sense that I have 4 decades of experience in repairing and designing electronics but above all I'm a great passionate about the subject.
Having said that I come to the gist of my post on the forum as the title suggests.
For my passion for technology I'm now collecting several Panasonic plasma TVs.
I think the image of these devices is superlative and even considering the era of their launch on the market, they are still difficult to beat in terms of reproduced image quality.
I can afford the "collection" as this generation of Panasonic plasma TVs are found at very low prices also because I buy them broken in order to repair them purely for personal satisfaction.
The more you go on with the years, however, the spare parts are increasingly difficult to find and those who have them (I'm talking about complete boards) ask for astronomical amount!
So I wonder why, as a technician, I have to change the entire board when perhaps the problem is (I say things at random) a transistor or a capacitor worth a few cents that is the cause of the failure???
Unfortunately, however, this professionalism is disappearing, all you do is change whole boards and throw them in the trash, or faced with absurd amount, you make the decision to throw away and buy the new model again, no one knows how to use a welder and read an electrical diagram anymore to understand the source of the problem.
In a period like the current one of attention to the environment, I think it is better to repair instead of constantly changing equipment, landfills are overflowing with electronics which in the vast majority of cases could have a new life with the intervention of a repair technician.
I am addressing the technicians of my generation, I graduated (almost 40 years ago, I also have some gray hair!) as a radio TV repairer, I come from the school of cathode ray tube TV (CRT), a era when it was much easier to fix everything.
I understand that SMD technology scares a little but the underlying electronics are always the same, you just need to put a little more effort into it then many boards, with the right equipment, in my opinion, can be repaired.
Specifically, Panasonic provides the service manual which is not bad but the diagrams, at least in the versions that I have found, are "blurred", not very legible and often some parts are missing, such as the power supply.
I therefore ask for help from someone on the forum who, by profession or other channels, has or is able to provide more information than what is found on the web.
Specifically I would like to have, if they exist, procedures to better understand where to sift through the schematic to find the fault.
I'll give an example referring to the title of the post: LED with 3 flashes (TX-P50VT50T, I have two with this problem).
The service manual says “IROM BOOT PROGRAM SOS”, change board “A” (main board) and/or “P” (power supply).
But damn! Can't you elaborate on what this “IROM BOOT PROGRAM SOS” means???
Perhaps by powering the card externally, bypassing some checks, in order to guide the technician to the origin of the problem.
From what I was able to decipher on the blurred wiring diagrams I checked all the voltages on board "A" (5-3.3-1.8-1.2-1.1) and for a moment, when switched on, they are present then the TV goes into protection and flashes the LED, Vsus and Vda are not shorted, only F15V (15.6V) and the standby 5V (which in my case are 4.4V) remain permanently present.
I don't believe in self-diagnostics, for me it complicates things and doesn't help solve the causes of the fault, perhaps my opinion clashes with the Panasonic designers but I would just like to have the possibility to investigate further to find out what is broken instead we change the board (which will most likely break again, planned obsolescence) and so we produce waste after waste!
I hope this speech of mine will interest someone, I thank those who have had the patience to read me up to here, sorry for the inaccuracies of English which is not my native language, I got help from Google to fill my gaps…
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