Hi
As I am new to this Plasma thing and to learn a little bit extra on what and how, I bought this Samy plasma with broken screen cheap so that I could understand some bits of it.
When I bought this, the guy said he had seen the display (but I doubt it).
At his house when he connected the power to the tv it made cracking - loud buzzing noise and - no display.
While I was bringing it to my place in the car, I smelt a little burning thing & doubted if it was from my car, but it was not. Reaching home I checked the panel and it was cracked quite much and at the bottom where the crack is running there were some burn marks inside there, so I realised what had happened.
After removing back cover and couple of times connecting power to it, it made some buzzing noise, eliminated all the boards etc one by one but found that only the bottom board when removed, it does not buzz. I think thats the control board.
I checked other 2 thread on our forum but their panel was intact, mine is not.
Anyways I am here to learn and diagnose the things if possible.
Please excuse my knowledge on these things as I am quite new to this.
The pic on panel suggests following voltages
Va (58), Vs (207), Vsc (-185)
Connecting power, Va and Vs does come to that point and then starts dropping fast, Vsc could be checked only on Y-sus and that too starts dropping from -185 to -9
The pother points I could find +5v and +15v remains constant and does not change.
As there is no power switch near to me I had to push/pull the power cable to the board.
[No Pwr] -- [Pwr] -- [AftrPwr] --- [RemovePwrCable]
# VS_ON [0] [3.26] [0] [0]
# PS_ON [0] [3.26] [0.16] [2.9]
I have mentioned AftPwr status is just within 1-2 sec status of connecting power, which means 3.26 comes on only for 1 sec I guess, not even 2 sec.
The PS_ON pin, when power plug is pulled, it immediately goes to 2.9 and stays there for few min and then starts dropping to 0
I have also noticed this, connecting -ve terminal of multimeter to the chassis (body-ground) and the +ve terminal to the 2 heatsinks of PSU, I get -105 so I was scared to touch that for checking if its hot or not.
These all tests were done after connecting all the boards & cables back. Also now when I have kept this display pane on very flat solid surface, connecting power cable, I do hear a little buzzing, not that loud which it used to do before.
Of course I am not expecting to change the display, its just for me to understand and option out bad component if possible.
Thanks
As I am new to this Plasma thing and to learn a little bit extra on what and how, I bought this Samy plasma with broken screen cheap so that I could understand some bits of it.
When I bought this, the guy said he had seen the display (but I doubt it).
At his house when he connected the power to the tv it made cracking - loud buzzing noise and - no display.
While I was bringing it to my place in the car, I smelt a little burning thing & doubted if it was from my car, but it was not. Reaching home I checked the panel and it was cracked quite much and at the bottom where the crack is running there were some burn marks inside there, so I realised what had happened.
After removing back cover and couple of times connecting power to it, it made some buzzing noise, eliminated all the boards etc one by one but found that only the bottom board when removed, it does not buzz. I think thats the control board.
I checked other 2 thread on our forum but their panel was intact, mine is not.
Anyways I am here to learn and diagnose the things if possible.
Please excuse my knowledge on these things as I am quite new to this.
The pic on panel suggests following voltages
Va (58), Vs (207), Vsc (-185)
Connecting power, Va and Vs does come to that point and then starts dropping fast, Vsc could be checked only on Y-sus and that too starts dropping from -185 to -9
The pother points I could find +5v and +15v remains constant and does not change.
As there is no power switch near to me I had to push/pull the power cable to the board.
[No Pwr] -- [Pwr] -- [AftrPwr] --- [RemovePwrCable]
# VS_ON [0] [3.26] [0] [0]
# PS_ON [0] [3.26] [0.16] [2.9]
I have mentioned AftPwr status is just within 1-2 sec status of connecting power, which means 3.26 comes on only for 1 sec I guess, not even 2 sec.
The PS_ON pin, when power plug is pulled, it immediately goes to 2.9 and stays there for few min and then starts dropping to 0
I have also noticed this, connecting -ve terminal of multimeter to the chassis (body-ground) and the +ve terminal to the 2 heatsinks of PSU, I get -105 so I was scared to touch that for checking if its hot or not.
These all tests were done after connecting all the boards & cables back. Also now when I have kept this display pane on very flat solid surface, connecting power cable, I do hear a little buzzing, not that loud which it used to do before.
Of course I am not expecting to change the display, its just for me to understand and option out bad component if possible.
Thanks
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