Hi,

I posted about my problem in the following thread:
Panasonic TH-42PA20 shut down issue - Post count #848

but I never got a reply, but I bought the chip in question and have replaced the old F6668B chip on the power board. The trouble is it hasnt fixed the problem and the tv just sits there blinking away 7 blinks pause 7 blinks again etc.

Now I was hoping someone here could try and help me in fixing this. But if not I'll just have to buy another tv (which I don't really want to :().

Any help would be grateful.

Cheers
Royds

Hi,

I posted about my problem in the following thread:
Panasonic TH-42PA20 shut down issue - Post count #848

but I never got a reply, but I bought the chip in question and have replaced the old F6668B chip on the power board. The trouble is it hasnt fixed the problem and the tv just sits there blinking away 7 blinks pause 7 blinks again etc.

Now I was hoping someone here could try and help me in fixing this. But if not I'll just have to buy another tv (which I don't really want to :().

Any help would be grateful.

Cheers
Royds

What is the suffix on your PS board part # ? This IC is a fix only for TNPA2841AB and AE. Suffix AH has the fix from the Factory.

Secondly, be sure you also solder on the component (top) side of the board as well as the bottom side. The holes are plated through from the Factory but the plating usually comes out with the old IC, necessitating that BOTH sides now be soldered.

T Wiz

What is the suffix on your PS board part # ? This IC is a fix only for TNPA2841AB and AE. Suffix AH has the fix from the Factory.

Secondly, be sure you also solder on the component (top) side of the board as well as the bottom side. The holes are plated through from the Factory but the plating usually comes out with the old IC, necessitating that BOTH sides now be soldered.

T Wiz


Thanks for the reply TW, the PS Board number is: TNPA2841 - 1P is printed above the number

Ok I'll put the solder on the top side as well, but normally when I've soldered stuff its only been ont he bottom and I didnt read about the solder on the top through the thread.

Thanks for the reply TW, the PS Board number is: TNPA2841 - 1P is printed above the number

Ok I'll put the solder on the top side as well, but normally when I've soldered stuff its only been ont he bottom and I didnt read about the solder on the top through the thread.


see here

http://www.avsforum.com/avs-vb/showthread.php?p=13422820#post13422820

and here

http://www.avsforum.com/avs-vb/showthread.php?p=12370660#post12370660

see here

http://www.avsforum.com/avs-vb/showthread.php?p=13422820#post13422820

and here

http://www.avsforum.com/avs-vb/showthread.php?p=12370660#post12370660

Cheers for that, since I've taken the board back out and put some solder on the top of the points and then replaced it back in the tv's working again. So far had it on for 1 hour, so far so good. It'll get a good use tonight, thanks for your advice TW.

Cheers for that, since I've taken the board back out and put some solder on the top of the points and then replaced it back in the tv's working again. So far had it on for 1 hour, so far so good. It'll get a good use tonight, thanks for your advice TW.

Very kewl ! Glad to hear it is working.

As for the IC part #, C5HABZZ00123 is still avaiable from Panasonic parts in the USA.
Not all of the original ICs were bad, although you would not think so from the reports on this Forum. It seems only the one production lot used in June-Aug 2003 would become thermal.

Many would act up as the thermal conducting paste woud dry up some and not conduct the ICs heat away into the large heat sink mounting. Replenishing the thermal paste would often cure the problem.

To be absolutely sure, the newer part was used which was less resistant to thermal problems. I guess in the UK, the oem vendor's latest production of these ICs does not have the original problem. I'd be curious if this IC is available with the "M" suffix or only the original "B" suffix ?

In any event, Happy Holidays !

T Wiz

Very kewl ! Glad to hear it is working.

As for the IC part #, C5HABZZ00123 is still avaiable from Panasonic parts in the USA.
Not all of the original ICs were bad, although you would not think so from the reports on this Forum. It seems only the one production lot used in June-Aug 2003 would become thermal.

Many would act up as the thermal conducting paste woud dry up some and not conduct the ICs heat away into the large heat sink mounting. Replenishing the thermal paste would often cure the problem.

To be absolutely sure, the newer part was used which was less resistant to thermal problems. I guess in the UK, the oem vendor's latest production of these ICs does not have the original problem. I'd be curious if this IC is available with the "M" suffix or only the original "B" suffix ?

In any event, Happy Holidays !

T Wiz

Well I work a lot with pc's amd am used to using thermal paste on cpu's, and I was surprised at how little there was on the IC. But after cleaning the heatsink and then applying some thermal paste on the new one and attaching it, it looks far better. I did try and buy the M chip from a company in the UK called signalsUK but they didnt have the M chip in as they said it been replaced with a better B chip. So I looked somewhere else and found it closer to me and they had 1 left in stock. Hopefully I'll beable to give the TV a long watch tonight.

Again thanks for your help TW and hope you have a great chrimbo. :D