Panasonic P50G20E

[tom66]

Re: Panasonic P50G20E

Yes, I looked into this, and I noticed P34 is missing on some of the G20 boards, but present on most V20 boards, the main difference being the absence of the fan on the G20.

Can you take picture of bottom of PSU... we need to trace if any of those pins go to the main board.

[Stanislav]

Re: Panasonic P50G20E

Ok
One of the pin is connected to pin 14 of the P7


And P7 goes to A board

[Stanislav]

Re: Panasonic P50G20E

other pin is connected to pin12 of P7 middle pin is free

[tom66]

Re: Panasonic P50G20E

Is one of those pins going to ground? (the screw hole is a good ground to test against)

[Stanislav]

Re: Panasonic P50G20E

none goes to ground

[tom66]

Re: Panasonic P50G20E

I looked it up and P34 is actually for the power switch, if present. Not for fan. Damn. Until I find the exact service manual for the V20, I'm stuck. May have to ask a friend.

[tw2005]

Re: Panasonic P50G20E

This is an Australian p50V20A manual.

No fans in this and the A-board PCB is TNPH0845 part/version# TXN/A1LHUA50

http://depositfiles.com/files/tt9hqm9t9

[tom66]

Re: Panasonic P50G20E

It may be the VT20 that has fans. (3D version.)

[tw2005]

Re: Panasonic P50G20E

I've got Canadian manual for TC-P50VT20 and can't see fans or SOS11 either.

A-board TNPH0835 vers#TXN/A1LSUUS

[tom66]

Re: Panasonic P50G20E

Service guide shows them though:
http://www.tgohome.com/ServiceManual...&Search=Submit

[tw2005]

Re: Panasonic P50G20E

Must be region specific then? Yes I can see the TH-P50VT20Z which I believe is New Zealand model so our Aussie one probably has also. Makes me wonder why not the v20 which I have.

[tom66]

Re: Panasonic P50G20E

VT = V-series Three-D.
V = V-series.

Driving a plasma panel with 3D contentrequires more brightness and faster switching (more power dissipation.)

[tw2005]

Re: Panasonic P50G20E

fair enough, that makes sense. Thanks.

In regards to the original board issue, I can't see if the exact version of each TNPH0838 A-boards he has been identified.

if I'm understanding the story he's purchased an A board from the UK?
Will a UK tuner work in his country?
I know that NZ and Aust have different frequency steps and range is also a little different.

I've tried it , not a single channel picked up. Boards were physically identical.

[tom66]

Re: Panasonic P50G20E

Most of Europe uses a very similar standard to Freeview DVB for over-the-air TV, which I believe is interoperable across all of Europe, but you could always use an external box for that in case that doesn't work.

Courtesy of a good friend, here is a VT20 service manual. I am going to wait at least a few days before posting it on SM site, per his request. Had to split it in two to get it up (woo, Python pyPDF), as it's a fringe bigger than 10MB.

[Stanislav]

Re: Panasonic P50G20E

My friends, the bad news is that this model has more than two fans ,that change and speed of rotation according to the operation of the TV

The other problem is that I can not open this TV to see where they are fans
The man said "never " Аnd the TV is mounted on a wall which further limits visual information for fans .
But certainly I see two fans on both sides

[Stanislav]

Re: Panasonic P50G20E

But most likely, fans have a separate board of management

a new board that came has three connectors more than my

1 is the subwoofer

2 and 3 are perhaps the connection between A board and board fans.

[tom66]

Re: Panasonic P50G20E

Looking at the schematic, the fan control is done through the "D" board on the VT20.

You do not have a D board as yours has the functionality combined onto the A board.

I'm guessing that some signal somewhere will be missing and there's little you can do about it, because it's not a simple on/off error.

Are you sure it's from a V20? Because there's no way that the V20 could use fans.

[Stanislav]

Re: Panasonic P50G20E

Are you sure it's from a V20? Because there's no way that the V20 could use fans.

This is written on the plate that came with the board

[Stanislav]

Re: Panasonic P50G20E

Panasonic TX-P50V20B- Main AV -TNPH0838 - TXNA1LWUB

This is written on the document that came with the board

:

[tom66]

Re: Panasonic P50G20E

Is "TNPH0838" same as your original board?