Panasonic TX-32LX85F blink 3 times, P Board-power supply

[tom66]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

5077 seems to code for the version you have, though.

[zeko]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

The power supply has the D854 not a 5V and this voltage comes from A-Board.
D854 near PC801 secondary side.
In addition to the IC802, is also A-Board with error???
Or if IC802 works then is also 5V on D854?

[tom66]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

I'm lost. What do you mean?
All the tests so far indicate IC802 is bad.

[zeko]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

Yes the IC802 is bad. I only ask because of 5V on IC854.

Signal from A-board comes later .. only starts IC802 and secondary is 24V, 17V and 9V be there. Is that so?

[tom66]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

IC802 should start as soon as relay power is applied. The PFC starts only when the A board sends the on signal.

Probably the first thing the A board does is turn the main power rails on, checks they're OK, then turns PFC on.

This also allows for the "recorder mode" (where the screen does not light, but the TV outputs video through SCART terminal to VCR) to be more efficient, as PFC is quite power inefficient, especially under low loads.

[zeko]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

It means that firs comes 24V, 17V, 9V and then comes signal from A-Board for start PFC?
If so, then the A-Board good.

[tom66]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

Yes, that's the idea. Recorder mode would only use about 10 watts, so no point in starting PFC. It is only legally required from 75 watts upwards, and would waste another 3 to 5 watts at that low load level.

[zeko]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

many thanks a lot

[zeko]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

M-Power 2A Block Diagram, page 9.

[zeko]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

it was bad IC802 MP2A5077 ..... many thanks it runs again

Another question,
can Arctic Cooling MX-2 thermal compound for PC is also used in LCD TV power supply, or must be one special thermal paste for an LCD TV?

[tom66]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

You can use any type of non-electrically conductive thermal paste.
Arctic silver is quite expensive, nearly any old stuff will do the job.

[raulone]

Re: Panasonic TX-32LX85F blink 3 times, P Board-power supply

Hi...i'm a new member..

i read all thread (with a very delay) because i've the same problem.
i ask to you: i can try replace the IC802 directly or i absolutely must do all checks?

Thanks!