panasonic tnpa5330 transistors

[Moreno83]

Re: panasonic tnpa5330 transistors

Yes they read short on a normal board. Why did you remove all those fets??

Diode RF1501 is only short if the other 6 fets are short. Same for DAF30A. If the fets on TOP op the board are short then you probably have bad buffers.
There was no need to remove the DG302 top right on the board ?

[Hombre]

Re: panasonic tnpa5330 transistors

First test buffers for shorts, if they are bad than makes no sense to continue with repairing the board

So put one of the probes in one of the holes where i marked it red/green and than with another one drive along the connectors for the flat cables.
If there is a beep, buffer IC is bad.

That ground tab between buffer connrctores looks really burned
All of those that you removed are bad?
Can you make a list?

[dj01fad]

Re: panasonic tnpa5330 transistors

Hello,
I guess you have a shorted buffer on this board. in your picture, you have 3 large non smd resistors on the left side under the second buffer. if you have a short between these resistors (any leg) and the ground, then for sure you have a shorted buffer.

[matyka]

Re: panasonic tnpa5330 transistors

Hello and very sorry for this update (been away Holiday)

I have checked for shorts like Moreno83 and dj01fad said and all looks ok no shorted buffers on this board .

When first time I have opened the tv the shorted bits was 2 fets (R6015ANX) and 1 fuse on the power supply.

On the tnpa5330 I had short:

Q421,Q422,Q423 ---- RJP30H2A
Q401,Q402,Q403 ---- 30F131
Q621,Q622 ---------- 30F131
Q611------------------RJP63G4
Q451------------------DG302
IC502-----------------BD8693FVM
Q531------------------CPH5524-TL

This All been changed with original new ones.

I have checked IC501 and Q501 and they are ok.

What do you see in the picture those RFN20 (D641,D642,D643) with the plastic bits, I managed to get them broken by lifting the legs up .

I had 1 attempt to power Up the tv and Bummm Again
I have Q661--Q621--Q622 Shorted again.
Tv Has 6 red light flashes now. First time was 7 .

What value I should have on the little resistor R507 near IC502 looks like has a little hole in .

[matyka]

Re: panasonic tnpa5330 transistors

Hello anyone had this problem with this TV right side of the screen is fine left side has some dots see photos please.

[dj01fad]

Re: panasonic tnpa5330 transistors

hello.
because the left side is broken... service mode is not a solution for mirror
first of all, check and clean all the connections from A-board to c-board and from c-board to panel. if it will be the same, then I say 10% is the left C-board and 90% is the panel... remove the aluminium stand mount and check all the large resistors from all the ribbons on C-boards. If you find a burn one then you have a bad COF on that coresponding ribbon. if not, try another left C-board. another test: remove the first ribbon coresponding to the bad zone (only the ribbon, leave the heatsink) and give it a shot: if it starts only vith a black stripe... it's the panel. if is the same situation... maybe is the c-board.
If it was from the A-board you did not have odd shapes on that half of screen.