Entertainment Center: TVs, Stereos, VCRs and DVDs - Akai PT4298HD no sound/picture
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HiramAbiff
03-24-08, 12:06 AM
There was a coolant leak on my set on the blue gun (my fault, I loosened the cover when doing optical focus) which dripped onto my convergence amp board. I assume this shorted out the board, because my set does the usual no sound/no picture when you turn it on.
I tightened the CRT cover so no more coolant could come out (a little bit had also leaked onto the component board beneath the convergence amp board but I cleaned it all up with paper towels and q-tips). Then I put in a new convergence amp board. I replug everything and......same problem, no sound or picture.
The only fuse I can find on the power supply board is right near the power cord and the wire is still intact (it's the glass tube kind). I know there are other fuses because the service manual (I have the PDF) says there are but I'm not electrically inclined so I can't find them. I mean I'm poring over the board with a flashlight (it's still in the set) and I can't see any other fuses. When I plugged in the convergence amp board's power connector I got a little spark, too, so I figured the juice must be flowing.
I'm at a loss as to how to proceed because repair is so expensive and I want to fix it myself if at all possible.
Somebody on FixYa suggested the short probably surged through the whole system and probably destroyed components on a lot of boards. Should I start saving my pennies for a new set?
I tightened the CRT cover so no more coolant could come out (a little bit had also leaked onto the component board beneath the convergence amp board but I cleaned it all up with paper towels and q-tips). Then I put in a new convergence amp board. I replug everything and......same problem, no sound or picture.
The only fuse I can find on the power supply board is right near the power cord and the wire is still intact (it's the glass tube kind). I know there are other fuses because the service manual (I have the PDF) says there are but I'm not electrically inclined so I can't find them. I mean I'm poring over the board with a flashlight (it's still in the set) and I can't see any other fuses. When I plugged in the convergence amp board's power connector I got a little spark, too, so I figured the juice must be flowing.
I'm at a loss as to how to proceed because repair is so expensive and I want to fix it myself if at all possible.
Somebody on FixYa suggested the short probably surged through the whole system and probably destroyed components on a lot of boards. Should I start saving my pennies for a new set?
Rick Johnston
03-24-08, 05:25 AM
Seating the connector to the convergence board with the power on probably didn't help either. That spark you saw could have fried every sensitive component if the ground didn't happen to seat at the same time as the + and - power.
The other fuses you mentioned can take the form of small (1/32nd or smaller) square inserts in board-mounted sockets.
The other fuses you mentioned can take the form of small (1/32nd or smaller) square inserts in board-mounted sockets.
HiramAbiff
03-25-08, 02:06 AM
Seating the connector to the convergence board with the power on probably didn't help either. That spark you saw could have fried every sensitive component if the ground didn't happen to seat at the same time as the + and - power.
The other fuses you mentioned can take the form of small (1/32nd or smaller) square inserts in board-mounted sockets.
Uh, well the power wasn't connected when I did that.
Anyway, I've decided to just replace the set.
The other fuses you mentioned can take the form of small (1/32nd or smaller) square inserts in board-mounted sockets.
Uh, well the power wasn't connected when I did that.
Anyway, I've decided to just replace the set.