panasonic TX-P42X20B flashing red

[tom66]

Re: panasonic TX-P42X20B flashing red

Can you located the 9V, 5V and 3.3V points on PSU, and check them with and without A board connected?

[craig417]

Re: panasonic TX-P42X20B flashing red

Hi new here so hello all.
I have one of these tv's that was blinking 10 times. I managed to get an A board from a 37" and put that in. Managed to get the picture and sound working again, only problem now is the top band of the picture is copied to the bottom.
Data in the tv says it is 37" model I have tried to change it to a 42" in the service settings but can not keep it to stay changed.
Looking to see if I can get the data from a 42" to load onto my A board. Read the service manual and this is what is needed when changing to a new A board.
Any help would be greatly appreciated.

[tom66]

Re: panasonic TX-P42X20B flashing red

The 37" is 1024x720
The 42" is 1024x768

There is your problem, it may not be possible to change it though.

[karlpowell]

Re: panasonic TX-P42X20B flashing red

Can you located the 9V, 5V and 3.3V points on PSU, and check them with and without A board connected?

OK ...i will have a go tomorrow , I have digital meter but have never done it before and may not have a clue where to look for these test points ..... Ill let you known tomorrow with all other boards not connected.

[tom66]

Re: panasonic TX-P42X20B flashing red

Any chance the 42X2 is close enough?
http://www.tgohome.com/ServiceManual...&Search=Submit

Voltages on page 51. Look for for "To P-Board (P6)".

Pin 1: 15V
Pin 2: 15V
Pin 3: 15V
Pin 4: 0V
Pin 5: 0V
Pin 6: 0V
Pin 7: 15V
Pin 8: 15V
Pin 9: 15V
Pin 10: 0V
Pin 11: 0V

That's obviously only the 15V rail... there is a 9V and 3.3V rail on there... I am not certain if it is close enough and will look up exact SM if I can.

[karlpowell]

Re: panasonic TX-P42X20B flashing red

http://img841.*************/img841/4052/vout.png

this is a picture of what voltages i got from each one , I noticed that P6 would slowly drain the 15v after a 15 seconds or so from each pin.


there is nothing at all on P35 which i assume is the 9v rail , If i remove all connectors from the P board except AC in , i dont hear the relay click over and i get 0v on all points tested above.

[karlpowell]

Re: panasonic TX-P42X20B flashing red

if you need anymore pics let me know

[tom66]

Re: panasonic TX-P42X20B flashing red

Unfortunately, I cannot find a service manual for this set, but I will ask a friend if he can get it. This may take time.

[awyatt2]

Re: panasonic TX-P42X20B flashing red

tom, i have it by chassis number but it is for the 50 inch version. if you think it will help i will try and email it to you. dewey

[tom66]

Re: panasonic TX-P42X20B flashing red

tom, i have it by chassis number but it is for the 50 inch version. if you think it will help i will try and email it to you. dewey

Yes that would help very much. It is likely to be close enough.

[karlpowell]

Re: panasonic TX-P42X20B flashing red

tom, i have it by chassis number but it is for the 50 inch version. if you think it will help i will try and email it to you. dewey

thank you awyatt2, Tom thank you for your help .

[selldoor]

Re: panasonic TX-P42X20B flashing red

Read the service manual and this is what is needed when changing to a new A board.

Any chance you could upload the service manual or a link to it

[awyatt2]

Re: panasonic TX-P42X20B flashing red

sorry i was at work and just got home. i am emailing it to tom now.

[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

[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

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

[vinceroger69]

Re: panasonic TX-P42X20B flashing red

ignore wrong thread sorry

[tom66]

Re: panasonic TX-P42X20B flashing red

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

[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

Check without the A board connected.