Question about Akai PT4298HD Rear Projection Television
Checked voltage at convergence board +22 and -22.
Checked low ohm resistors on conv. board, they seemed fine.
Tried to unpluge power connector at convergence board and set still has no power.
Do'nt here the high voltage come on when powered up.
Can see the heaters light up on all 3 crt's.
Maybe power supply problem?
Please tell what to check on this TV.
Checked HOT for power and i got plenty on the collector over 1000v. The base showed less than 10v if I remember right. There was no high voltage kicking in at all, so I checked part of the fly back for voltage. I downloaded a schematic for a for a samsung 4416 chassis, which is the same as the 4298. Voltage at pin 10 or 11 should be 117v, I had nothing. Traced back from schematic and found r465( 0.47 ohm resistor} was open, but not burnt. Replaced it and everything fired up. This resistor acts like fuse. A 25cent part can kill a 1000 dollar tv. It works now and I am happy
Posted on Jan 22, 2008
If you know aything about tvs which it appears you do check to see if you are getting voltage to the horizontal output ckt at the collector of the horizontal output transistor if you are probably you either have a horizontal drive or output problem if you are not check to see if you have either fuses or icps or pico fuses are open generally you will see about a 135 volts to yhe hoizontal output ckt.
Posted on Jan 20, 2008
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