3 red blink in panasonic 65vt60

[Shay2023]

You are right The SC is malfunctioning for sure
But I also get 8 red light blink when conect the ribbon cable of the ss to the main board.

My understanding in electronic is low and I love this plasma tv so I am trying to repair it myself by replacing the fulty board with a working.

About the ss board I attached picture of the ss board and I mark the igbt I think you meant that need to mesure them for short?

How I mesure them there is three leg?

Thank you very much!

[Biruslapio]

Yes, those screwed to the heatsink, if there are any low OHMs reading between any of the pins of the IGBTs, something is shorted. They are marked as "QXXX" for MOSFET transistors (G D S) and IGBTs (G C E).

8 blinks points to SS board, 6 and 7 blinks are for SC board, the service manual I found lists no blink codes for P60VT60 and is very incomplete, no schematics, only block diagrams.

[Shay2023]

I mesure transistors G C E
All of them is 570-590 ohms and 240-270 ohms
Between thr different legs but all is the same reading.

I find TPVE test point of SS board and TPVSUS of
SS board.

I isolated the SC board completely disconnected the ribbon cable and the Dc power connector.

Turn on TV and got 8 red light,
I mesure TPVE it start in 140 VDC and quickly drop to
0 VDC.
I mesure TPVSUS it start 140 VDC and quickly drop to
0 VDC.

Does it mean a bed SS Board or because the tv shut down to 8 red light mode the DC voltage drops?

Thank you very much on your help!

[Shay2023]

ן do another test disconnected also the ribbon cable of theSS board and tv click no red light, now green light and 2 fan spining.

The voltage Also stable
TPVE=149 VDC
TPVSUS= 200 VDC

Maybe the ribbon cable is not good?
Or it is a problem of the SS Board?

When conect the ss ribbon cable the tv red light flash
8 times and voltage on the 2 test point of ss board falling quickly.

Thank you very much!

[Biruslapio]

I don't know if the tv works with SS only, generating VE is half of it's job, but actual 240 or even 590 OHMs is very low for IGBTs, the least I've seen is 5kOHMs and that was a resistor between gate and emitter on the board itself, VSUS only going to 140V is bad.

I would dessolder those transistors and test them off the board, but since that's difficult, I recommend first buying a SC replacement, if 8 blinks still happen, then a SS board, which should be cheap, the SC is more expensive.

For P65VT60B, SC board should be TNPA5795, SS TNPA5796.

[Shay2023]

I took another reading when the ribbon of the SS board
Disconnected from the main board so the tv on with fan spining

The voltage on the Ss board stable
TPVE=149 VDC
TPVSUS= 200 VDC

This Is the highest I mesure is it low?

You mean the igbt need to mesure between legs
5000 ohms in the voltmeter screen the max I mesure
Was 590 ohms?

Thank you.

[Biruslapio]

I didn't understand the multimeter part, but the SS does not operate fully without the mainboard, for now I'll stand with recommending a SC replacement, then if it still blink 8 times, replace the SS board.

[Shay2023]

my sc board part number is TXNSC1UCUUTH
I managed*to find*another sc board*TXNSC1UDUUTH
visually they look the same

Do you know if they are interchangeable?

Thank you!

[Biruslapio]

They are different, there are two models:
TNPA5795AC (P60VT60 / P65VT60) TXNSC1UCUUTH
TNPA5795AD (P60ZT60 / P65ZT60) TXNSC1UDUUTH

Looks very similar, but there might be some SMD components that change and will need to be swapped between the two boards, so unless you have a hot air station and experience with that, finding a CUUTH model is best.

[Shay2023]

It is very difficult to find TXNSC1UCUUTH SC board
I only find in ebay one but it is in exchange to my fulty sc board.
I will have to pay two costly shipping +service repair.

The ss board is lass difficult I saw it in ebay for selling

I searched ebay and aliexpress.

Do you familiar a good place that sell good condition panasonic board?

Thank you.

[tvtimmy]

Service manual.