Panasonic TC-P50VT20

[tw2005]

Re: Panasonic TC-P50VT20

Thanks for you r help. Just fixed a whirlpool Vertical Modular Washer..it needed a shift actuator and a mixing valve..I am going to remove and analyze SC..My money is on it.

funny, it is a whirlpool. Not built to last, second control board in 2 years, absolute rubbish. good when it's working but $300 for the board.

Totally dead. still have the old one which i suspect had a corrupted eeprom, may try a swap. If it had blink codes, I'd be right. LOL.

could be switch but AC power is getting to it and that's it.

the other one has one program it will run, 2 hrs and 60 deg C, we wash cold so betterthan nothing ATM

[ljintexas]

Re: Panasonic TC-P50VT20

Is it 120 volt?. I have a good control board

[ljintexas]

Re: Panasonic TC-P50VT20

Post model number of board or washer

[tw2005]

Re: Panasonic TC-P50VT20

Is it 120 volt?. I have a good control board

Post model number of board or washer

no, we're 240v . it's a front loader, wfs1285aw. control module/mainboard 481221470545. pretty sure it's not a US market item, thanks anyway

[ljintexas]

Re: Panasonic TC-P50VT20

Get rid of that front loader and get the top of the line top loader..The only good front loader is a commercial front loader. all of the resi front loaders have inherent issues..not all the same issues either. My board is different..Ill find someone that needs one..I ifixed this one. one bad diode and one bad capacitor..also replaced one of the relays that was iffy.
On the road in El Paso, Tx until tomorrow..Back on the Panny tomorrow..
Thanks

[tw2005]

Re: Panasonic TC-P50VT20

Get rid of that front loader and get the top of the line top loader..The only good front loader is a commercial front loader. all of the resi front loaders have inherent issues..not all the same issues either. My board is different..Ill find someone that needs one..I ifixed this one. one bad diode and one bad capacitor..also replaced one of the relays that was iffy.
On the road in El Paso, Tx until tomorrow..Back on the Panny tomorrow..
Thanks

Fixed, removed good eeprom, from DEAD board, copied and SAVED file. Removed suspect eeprom from original board 2 years ago. Compared content, corrupted.

Reprogram with good data, reinstall and fixed.

that board had a F14 error which i had a good idea was eeprom as only 1 program would work, rest were F14.

I did approach Whirlpool to see if the bin file was available, needless to say never returned my cal. That's $300 board for the sake of corrupted data.

there's a lot to be said about the old mechanical timers as opposed to micro-processor based .

Last one was a hoover, lasted25 years with the usual wear and tear items replaced

[ljintexas]

Re: Panasonic TC-P50VT20

What do you make of the fact that when I remove the four screws holding the su/sd boards as directed and then check them to chassis ground as stated in the g20/g25 manual, I get infinite resistance or OL on all of the test pads? Should I be checking them to some other ground source?

[tw2005]

Re: Panasonic TC-P50VT20

What do you make of the fact that when I remove the four screws holding the su/sd boards as directed and then check them to chassis ground as stated in the g20/g25 manual, I get infinite resistance or OL on all of the test pads? Should I be checking them to some other ground source?

I make you have an open cct because you don't use chassis gnd as they are not connected to it but Vfg which is floating ground tied at the SC board. The metal pads where the buffer bolts go through on the buffer board, that's your reference.Go back to the guide and look at what they show

[ljintexas]

Re: Panasonic TC-P50VT20

I will review..the instructions say to remove those four screws before performing the test.

Thanks

[tw2005]

Re: Panasonic TC-P50VT20

page 43-44 of the G20. is that what you're following? that's what I'd be doing for buffer checks

[ljintexas]

Re: Panasonic TC-P50VT20

Thats it!

[ljintexas]

Re: Panasonic TC-P50VT20

Miserably shorted...also performed the shorted P15V testing as well as other testing outlined in manual..everything points to SC board and su/sd. Only one test result had a possibility of the A board being faulty. I am going to send Sc to moduslinks and buy new su/sd.

[tw2005]

Re: Panasonic TC-P50VT20

Miserably shorted...also performed the shorted P15V testing as well as other testing outlined in manual..everything points to SC board and su/sd. Only one test result had a possibility of the A board being faulty. I am going to send Sc to moduslinks and buy new su/sd.

can you share what you found with the buffers. like pin x - Vfg resistance etc. I am quite surprised both sd & su are coming back as shorted. I have had it on 1 V20 model I've touched so possible but it is rare overall with all the TVs I've helped and read about here.

[ljintexas]

Re: Panasonic TC-P50VT20

Sure//let me go out and get my notebook.

[ljintexas]

Re: Panasonic TC-P50VT20

SU41 VFO1.9 ohms, VSCN-F 219K, 5V_F124 ohms
SD42 VFO3.0 ohms, VSCN-F 219K, 5V_F1.7 ohms
VFO and 5V_F should both be in the Megohm range

[ljintexas]

Re: Panasonic TC-P50VT20

So far numerous transistors and diodes bad on SC board
Ordered all three from Tristate Module. Under $125 with freight..will test them before installation.

[tw2005]

Re: Panasonic TC-P50VT20

So far numerous transistors and diodes bad on SC board
Ordered all three from Tristate Module. Under $125 with freight..will test them before installation.

yeah, ok.wonder how Q661 survived normally # 1 victim but i'm glad we were thorough because the description leant towards A board.

Those figures look similar too when i had a bad v20. that's the one I did not check the boards and destroyed a new SC when they were a bit more available.

$125 for the 3 is good. i trust you ordered the correct revision boards as the SC and SD boards are different in the 3D.

keep that core board, or sell it.

[ljintexas]

Re: Panasonic TC-P50VT20

I know for sure that SD/SU/SC are bad by the troubleshooting methods in the manual. Q660 is shot, but Q661 is okay. Found a handful of shorted diodes on it as well. On one of the logic diagrams for troubleshooting A board is listed as possible cause of failure.When I followed the shorted F15V power on procedure, it came up with SC.
We will see..I am hoping A board made the trip. Previous owner replaced A Board and P board and still had 10 blinks.

[ljintexas]

Re: Panasonic TC-P50VT20

With the demand for the SC board as high as it is..i am thinking of sending it to Moduslink anyway. They will repair for $96. I can sell it for $150 without trying. I see them on all the websites for $169. But nobody has one. All are out of stock.

[tw2005]

Re: Panasonic TC-P50VT20

Previous owner replaced A Board and P board and still had 10 blinks.

now that info would have helped. yeah makes SC very likely.