ok,I am trying to fix my sisters viewsonic n2750w model vs10576-1m
After reading a couple posts I have determined that it has the 2 sec to black problem. or more appropriately the half second to black. the tv seems to function fine, sound but I can only see a picture by shining a flashlight on it. But the tv is functioning fine otherwise. After reading https://www.badcaps.net/forum/showthread.php?t=10419 this thread I thought maybe it was a transistor because it was so quick to go to black.
so after taking the back off I found three boards.
Main board
power board
and audio board
after visual inspection all capacitors look fine. Since the sound is fine and the main board seems overwhelming I am focusing on the power board capacitors. After taking the power board to an Electronic repair friend he said replace the 4 larger capacitors at the top of the board 2 1000uf 25v and 2 1000uf 35v. After being told panasonic makes a quality capacitor I picked some up. I installed the capacitors and plugged in the tv and it did not fix the problem. Also there has developed some sound coming from the speaker which I am told can also be caused by some of the smaller capacitors on the board being bad. Since then I have purchased the "MK - 168 TRANSISTOR TESTER"
If anyone knows anything about this meter, it did not come with instructions but I am figuring it out. One of the pluses of this meter is that it measures ESR. I am not use to working with ESR so I am learning more about that every day.
So here are my issues:
I plan on removing all the capacitors and testing them off the power board this week hopefully I will find an abnormality and maybe just order a new set for the board and replace them all anyways. Is there a standard esr I should look for? If I remember correctly it should be around 18 -20? I cant help but think my thoughts of the transistor being problem. I need to figure out how to test transitors with this tool(if anyone has any ideas). Can transistors be tested in circut?
I also wanted to get a group opinion as to if i am on the right track, any other idea might solve the problem.
Thank in advance for all your help.
After reading a couple posts I have determined that it has the 2 sec to black problem. or more appropriately the half second to black. the tv seems to function fine, sound but I can only see a picture by shining a flashlight on it. But the tv is functioning fine otherwise. After reading https://www.badcaps.net/forum/showthread.php?t=10419 this thread I thought maybe it was a transistor because it was so quick to go to black.
so after taking the back off I found three boards.
Main board
power board
and audio board
after visual inspection all capacitors look fine. Since the sound is fine and the main board seems overwhelming I am focusing on the power board capacitors. After taking the power board to an Electronic repair friend he said replace the 4 larger capacitors at the top of the board 2 1000uf 25v and 2 1000uf 35v. After being told panasonic makes a quality capacitor I picked some up. I installed the capacitors and plugged in the tv and it did not fix the problem. Also there has developed some sound coming from the speaker which I am told can also be caused by some of the smaller capacitors on the board being bad. Since then I have purchased the "MK - 168 TRANSISTOR TESTER"
If anyone knows anything about this meter, it did not come with instructions but I am figuring it out. One of the pluses of this meter is that it measures ESR. I am not use to working with ESR so I am learning more about that every day.
So here are my issues:
I plan on removing all the capacitors and testing them off the power board this week hopefully I will find an abnormality and maybe just order a new set for the board and replace them all anyways. Is there a standard esr I should look for? If I remember correctly it should be around 18 -20? I cant help but think my thoughts of the transistor being problem. I need to figure out how to test transitors with this tool(if anyone has any ideas). Can transistors be tested in circut?
I also wanted to get a group opinion as to if i am on the right track, any other idea might solve the problem.
Thank in advance for all your help.
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