panasonic tx-p42gt30b

[Jahson]

Help need the service manual please,
can only get the instruction manual

[Alastair E]

Re: panasonic tx-p42gt30b

Whats the fault with the set....?

Chances are, someone's had it before.....

[Jahson]

Re: panasonic tx-p42gt30b

Yea that's a good guess, did few basic checks, 1 fuse blown out, but to me looks like some had soldier it on, like snip the legs from the previous fuse the soldiered the new on.

Also notice the ribbon band cables not all have been closed. Some ribbons just hanging loose from connections.

Going try add photo, looking for cable for my phone, in the mean time this fuse has
yellow, black, red, blue bands. not sure if that's correct rating.

Seen a board on fleabay, but the fuse just had a single silver band.

On the board it says something like T4AH not sure if that's for the fuse thought as were its written.

[Alastair E]

Re: panasonic tx-p42gt30b

Its a Time-Delay type 4A fuse....

Thats a normal type fitment of fuses in a lot of Pan. sets--nothing has been disturbed with it before....

Chances are there's a short MOSFET or summit in that board...

[Jahson]

Re: panasonic tx-p42gt30b

Cheers Alastair E, ordered few spares fuses, in-case it blows again.
Have not checked any diodes or mofets as yet

[Jahson]

Re: panasonic tx-p42gt30b

Quick update, tested all I could on power board, found a blown ceramic resistor or is it a thermal fuse? also, next problem is cant locate anywhere to get one.

Sorry for board photo upside down, only trying to show were the resistor is located.

[Alastair E]

Re: panasonic tx-p42gt30b

Std 7W Wirewound 15 ohm resistor.

[Jahson]

Re: panasonic tx-p42gt30b

when you say standard, 7w 15ohms resistor, I could walk straight into maplins & get, its got 3 pins.

[vinceroger69]

Re: panasonic tx-p42gt30b

http://cpc.farnell.com/te-connectivi...20This%20Range

cant seem to find any on ebay?

http://www.maplin.co.uk/p/wirewound-...-resistor-l15r

was all three pins soldered to the board or just two?

[Jahson]

Re: panasonic tx-p42gt30b

yea I checked ebay, was thinking cant get on ebay, im doomed, no way I could walk into maplins then?

when checked on meter the working one reads
Top left too Top Right = 0.04
Bot Left too Top Right =15.3

Faulty Reads
Top left too Top Right = 0.04
Bot Left too Top Right =O.L

In photo its got the pen markings

[tw2005]

Re: panasonic tx-p42gt30b

Looks like it could be a fused resistor, 15ohm 5W

[Jahson]

Re: panasonic tx-p42gt30b

yea tw2005 that sound about right, just wasn't sure, think I said thermal fuse thought.

Need to get my hands on one.

Just had a brainwave, stand well back with amazement, could I but a 5w 15ohm wire wound resistor on the bottom left & top right pins?

[tw2005]

Re: panasonic tx-p42gt30b

yea tw2005 that sound about right, just wasn't sure, think I said thermal fuse thought.

Need to get my hands on one.

Just had a brainwave, stand well back with amazement, could I but a 5w 15ohm wire wound resistor on the bottom left & top right pins?

On second thoughts I'm thinking that symbol may simply mean it's a fusible type resistor, the cct diagram shows no connection for that single lead but would be nice to get a clear sharp picture of the foil side of the board where that solders in.

need to see the cct, some of the other guys have more PSU knowledge but I'd be thinking the connection will be across the 2 closest pins.

Need the photo and probably some other eyes on it. 240AC is passing through that to the rectifier bridge. You checked that too? I'm assuming it's R100 that we're dealing with. or??

Photo was real fuzzy.

[tw2005]

Re: panasonic tx-p42gt30b

ftp://helpedia.com/pub/temp/datashee...c_TC-P42GT30A_[SM].pdf

should get you by, has TNPA5390 PSU

[Jahson]

Re: panasonic tx-p42gt30b

cheers tw2005, yea it is r100 and the board is tnp5390a, cant find my camera lead, so photo from my phone.

Will take the photo back & front.

Fuse F102 has been removed, also R100 from the board

[tw2005]

Re: panasonic tx-p42gt30b

does camera use SD card and you have a laptop or PC with SD reader? I've done that in a pinch.

[tw2005]

Re: panasonic tx-p42gt30b

Ok, just found a board using the same style of resistor and yes, that top solo leg is no connection, across the 2 close pins needs to be 15ohms but I would be using a ceramic wirewound there. If you still have an issue it will blow with a lot of energy especially if there is dead short on the mains.

[Jahson]

Re: panasonic tx-p42gt30b

But R227 is the same and does not read open, I have undone the leg to test.

[tw2005]

Re: panasonic tx-p42gt30b

But R227 is the same and does not read open, I have undone the leg to test.

I realise that. On the topside where R100 was. Pin 1 is no connection, i.e. has no involvement with the rest of the cct.

pins 1 & 3 are tied or the same connection(internally on the resistor)

pin 2 is the other end

So ignore pin 1, pin 2-3 is the 15ohm 5W fusible link.

[vinceroger69]

Re: panasonic tx-p42gt30b

maplin dont carry 5 watt only 3 and 7 it seems
http://www.ebay.co.uk/itm/Ceramic-Wi...item27dff4404a