panasonic TX-P42X20B flashing red

[karlpowell]

Re: panasonic TX-P42X20B flashing red

P6
pin1 (sound +15v) = 0v
pin2 (sound +15v) = 0v
pin3 (p+15v) = 0v
pin7 (f+15v) = +15.8v
pin9 (f+15v) = +15.8v

P7
pin1 (standby 5v) = +5v
pin3 (s0) = 0v
pin4 (s1) = 0v
pin7 (panel main on) = 0v
pin5 (tv sub on) = 0v
pin11 (all off) = 0v
pin8 (stb-5v 0n) = 0v
pin9 (sos p4) = 0v
pin12 (main-sw) = +5v
pin14 (main sw) = +5v

[tom66]

Re: panasonic TX-P42X20B flashing red

Have you gone back and retested them all?

[karlpowell]

Re: panasonic TX-P42X20B flashing red

please ignore all the test before today the above picture is 100% correct

[tom66]

Re: panasonic TX-P42X20B flashing red

You're losing me here. Previously, you have +15V on SOUND+15V, and nothing on F+15V. Then, you have voltage on both. Now, you have voltage on F+15V, but nothing on SOUND+15V.

Please go back, get the TV into 10 blink state, and measure each pin along that connector again so we can be sure if voltages are there or missing.

[karlpowell]

Re: panasonic TX-P42X20B flashing red

is it worth trying to fix the A board or should I just find a replacement for it ?

[tom66]

Re: panasonic TX-P42X20B flashing red

Right now, if those measurements are good, everything appears to be working on the P board side, so the problem is quite possibly the A board.

[karlpowell]

Re: panasonic TX-P42X20B flashing red

i did the test this afternoon as I have had to take the set into work ( the Mrs was complaining about it in the back room ) but if you look at the above picture i have done pin 9 and 7 are both +15v..


I WILL DOUBLE CHECK THIS AGAIN IN THE MORNING IF YOU LIKE .


Just reading your upper post there is NO +15v on the SOUND+15V (pin 1/2)..... only +15v on pin7 and pin9 F+

[tom66]

Re: panasonic TX-P42X20B flashing red

This is different from previously measured. Are you certain?

[karlpowell]

Re: panasonic TX-P42X20B flashing red

F+ on P6 pin 9 and 7 are both +15.8 V

[tom66]

Re: panasonic TX-P42X20B flashing red

The signals are present to turn the outputs on, but they are not coming up. Hmm. Since SOUND+15V is present, it sounds a lot like the processor on the power board is not turning on the outputs for some reason. Can you check the F+15V just as the set throws the ten blink code?

[karlpowell]

Re: panasonic TX-P42X20B flashing red



this is what i get compares to what the servive manual says.

[karlpowell]

Re: panasonic TX-P42X20B flashing red

nice one Craig, I can disconnect the A board but not from P7 as then i don't hear a click and I don't get any voltages from the P board .

[craig417]

Re: panasonic TX-P42X20B flashing red

Here is the service manual that covers this tv model, sorry I did not upload earlier. Hope it may be of some help. First try at uploading attachment so hope I get it right.

[tom66]

Re: panasonic TX-P42X20B flashing red

Check without the A board connected.

[karlpowell]

Re: panasonic TX-P42X20B flashing red

thanks a lot Tom , I can see that the voltages from the P board are not correct ...ive not got a clue where to start

[tom66]

Re: panasonic TX-P42X20B flashing red

Ah, did it again... Try this one:
http://www.tgohome.com/ServiceManual...&Search=Submit

[vinceroger69]

Re: panasonic TX-P42X20B flashing red

ignore wrong thread sorry

[karlpowell]

Re: panasonic TX-P42X20B flashing red

link doesn't work tom, what do you think about the voltages from the P board ... do you think this could be the fault ?

[tom66]

Re: panasonic TX-P42X20B flashing red

Here is what awyatt2 sent me.
http://www.tgohome.com/ServiceManual...ic_TH-M50HD18_[SM].pdf

[karlpowell]

Re: panasonic TX-P42X20B flashing red

If its a power supply fault, it looks like i can source 1 for around 30 euros , this might be the chassis number ... mc106h30u13 .

http://www.ksp-electronics.com/downl...file=404767423
http://www.ksp-electronics.com/downl...file=404767424