panasonic tx42-p42x20b

[tom66]

Re: panasonic tx42-p42x20b

I don't see how probing inductors is going to help -- to save me reading the whole thread again could you recap on the current fault you're chasing?

[adamp91gvm]

Re: panasonic tx42-p42x20b

10 flashing light power board seems to be giving off the right amount of v to the A board tw2005 said just try the v from the inductors we had tried a few things and he wanted to know the sub 3.3 v I think

[adamp91gvm]

Re: panasonic tx42-p42x20b

I was thinking of replacing the A board but can not find one for this model

[tom66]

Re: panasonic tx42-p42x20b

Pic of each, if available please:- (there's a lot so OK to try and get multiples in one photo, but need to be able to see the components around them. Your pics are great so just try to keep same focus/lighting quality.)

• Tuner power developed from IC2950, IC2952, IC2953. Likely near tuner can.
• P+5V generated by IC9801.
• P+3.3V generated by IC9802.
• P+1.2V generated by IC9800.
• AVDD+3.3V generated by IC5603.
• AVDDH+3.3V generated by IC5604.
• SUB+9V generated by IC5401.
• SUB+3.3V and SUB+5V generated by IC5601.
• SUB+1.8V and SUB+1.2V generated by IC5600.
• SUB+5.6V generated by IC2870 possibly near power input connector.

Just need pic of each IC#### which should be marked on the board near the device.

SGSOS circuit (probably one possible 10 blink cause) senses P+5V, P+3.3V, SUB+5.6V, SUB+9V, SUB+1.2V, SUB+1.8V, SUB+3.3V, SUB+5V for over-voltage, and SUB+5.6V, SUB+9V and SUB+5V for presence. If a fault occurs in any of these then the error detect will fire.

If SGSOS fault detect, TP5471 would go HIGH ~3.3V.

[adamp91gvm]

Re: panasonic tx42-p42x20b

Just a pic of each area ?

[tom66]

Re: panasonic tx42-p42x20b

Yes, try to make IC#### visible.

[adamp91gvm]

Re: panasonic tx42-p42x20b

[adamp91gvm]

Re: panasonic tx42-p42x20b

[adamp91gvm]

Re: panasonic tx42-p42x20b

[adamp91gvm]

Re: panasonic tx42-p42x20b

[adamp91gvm]

Re: panasonic tx42-p42x20b

[tw2005]

Re: panasonic tx42-p42x20b

I don't see how probing inductors is going to help -- to save me reading the whole thread again could you recap on the current fault you're chasing?

I gave him the 2 inductors that the 3.3 & 5V pass through as test points to see if they were being generated or not.

[adamp91gvm]

Re: panasonic tx42-p42x20b

[adamp91gvm]

Re: panasonic tx42-p42x20b

[adamp91gvm]

Re: panasonic tx42-p42x20b

[adamp91gvm]

Re: panasonic tx42-p42x20b

That's em all I think

[tom66]

Re: panasonic tx42-p42x20b

See here... I've got to do some homework so try these tests 1st then we'll focus on the rest... tuner power.

Check across each pair of red while board installed & just as it is booting up (it might shut down voltages at 10 blinks so try checking just after plug in, or just after leaving standby, light should blink for a few secs beforehand), if necessary, solder wires and measure externally.

Added DVB reg IC8302 that wasn't mentioned before, but that's on this pic so don't worry.

[adamp91gvm]

Re: panasonic tx42-p42x20b

Ok ill try that it might get tomorrow now if that's ok thank you so much for your help both of u

[adamp91gvm]

Re: panasonic tx42-p42x20b

On the 5.5 I'm getting 6 v and the 3.3 I'm getting 3.27v on the 1st pic

[tom66]

Re: panasonic tx42-p42x20b

To the nearest metal pads those lines go to.