Originally posted by timwebb22
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dual rectifier
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Re: dual rectifier
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Re: dual rectifier
Originally posted by timwebb22 View Postok. it looks like im missing the 12-24v for the inverter.
and please can we have a picture of the bottom of the board.
Also can you state the make and model of the TV.
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Re: dual rectifier
ok. it looks like im missing the 12-24v for the inverter.
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Re: dual rectifier
Originally posted by timwebb22 View Postok i was trying different grounding points while testing. i used the heatsink on the big ic as a grounding point and i see 28v on the 12-24v pin for the inverter and i get 19.6 volts on the pins on the inverter.
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Re: dual rectifier
ok i was trying different grounding points while testing. i used the heatsink on the big ic as a grounding point and i see 28v on the 12-24v pin for the inverter and i get 19.6 volts on the pins on the inverter.
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Re: dual rectifier
Originally posted by timwebb22 View Posti normally repair audio amps and such. im trying tv's now. different ball game now.
i tried google but didnt come up with anything. i did the steps they are good.
i found a bad zener diode over by the big ic now the relay click.
the problem was it was in a pawn shop on display and they left it on all the time until it went out if it helps any.
Zeners are difficult to test with a meter, but they most commonly fail shorted or open. If you test one way and get a reading around 500mV, it is probably okay. But if you test nearly zero or open both ways then it's failed.
Are you getting any power indication from the TV? Any LED?
Do you have a multimeter?
If so:
- Is the mains fuse OK?
- Does it give a standby voltage (usually 5V)?
- If it turns on does 12/24V come up?
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Re: dual rectifier
i normally repair audio amps and such. im trying tv's now. different ball game now.
i tried google but didnt come up with anything. i did the steps they are good.
i found a bad zener diode over by the big ic now the relay click.
the problem was it was in a pawn shop on display and they left it on all the time until it went out if it helps any.
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Re: dual rectifier
Originally posted by budm View PostCommon Cathode with Isolated tab, we ran into this problem before with the person did not order the Isolated tab version.
But the datasheet retiredcaps and I have given is for the TO-220F package
which is fully insulated, though it doesnt say so in the sheet other than by the package type.
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Re: dual rectifier
Common Cathode with Isolated tab, we ran into this problem before with the person did not order the Isolated tab version.
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Re: dual rectifier
Originally posted by timwebb22 View Postim looking for the data sheet for this part. part name is en220a it is from a ps to power the inverter.
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Re: dual rectifier
Originally posted by multimeter View Postare they not dual shottky diodes?
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Re: dual rectifier
That sounds fine, but to confirm -
Number pins 1-3 left to right.
Labelled (pos/red) (neg/black) respectively (use diode test.)
Test 1-2 should read ~150 - 700.
Test 2-1 should read single "1" or "OL".
Test 2-3 should read single "1" or "OL".
Test 3-2 should read ~150 - 700.
Test 1-3 should read single "1" or "OL".
That looks a lot like a Toshiba PSU.
The power module clamped to the heatsink (the one with lots of pins) can sometimes go faulty, though this usually blows the fuse.
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Re: dual rectifier
Originally posted by timwebb22 View Postthe part go right behind the yellow and black transformer. it traces back to the plugs for the inverter. it reads 1.83 in diode check. and 70k in ohms. which seems very low.
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Re: dual rectifier
Do you have a picture of the part, and the area of the PSU it comes from?
If the device is failed (usually shorted), then it may be possible to use an alternative compatible device.
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