sanyo dp 42647

[truep]

Got this today, it has the 2 seconds to black problem. There is a CMO master and slave inverter. All PS voltages are good, and no bulges caps. Any quick way to determine if it's the master or slave inverter causing the problem?noises occur when the lights go out. there is a brief picture, and audio is fine.

[tom66]

Re: sanyo dp 42647

Test the resistance of the inverter transformer secondaries (when unplugged) with a multimeter. Note any outliers.

[truep]

Re: sanyo dp 42647

all secs teas at 6.9-6k. primaries are ok too

[truep]

Re: sanyo dp 42647

OOPS! That should be test ok.

[tom66]

Re: sanyo dp 42647

OOPS! That should be test ok.

You may have either a few bad driver transistors, or a bad CCFL.

Can you test the transistors for shorts or opens? Also test the fuses on the board. If all of these pass, then the CCFL may be dead.

[PlainBill]

Re: sanyo dp 42647

all secs teas at 6.9-6k. primaries are ok too

6.9 - 6K is too wide a range. They should match to within 3%. Perhaps if you post the actual readings....

PlainBill

[truep]

Re: sanyo dp 42647

that should have been 5.9-6k.

[truep]

Re: sanyo dp 42647

It was the slave inverter.

[tom66]

Re: sanyo dp 42647

It was the slave inverter.

How did you determine this?

[truep]

Re: sanyo dp 42647

I found that I had one from another set. I replaced it and it came up fine