Panasonic TC-P42S30 Standby light

[nearfall2]

I have been reading the board for the last couple of evenings and have found some good stuff but I want to get some input from you experts because I don't know Jack about electronics.

The TV is a Panasonic TC-P42S30 that only goes to standby when turned on.
After reading the forum I disconnected the SN board and got an 8 blink code.
I tested some of the components on the SN board (TNPA5349) and this is what I got:

SN 2 - .5 Ohms

Transistors - I tested back to each leg in diode mode
Q441 - 047, 000
Q451 - 004, 360
Q422 - 000, 000
Q421 - 015, 000
Q402 - 008, 000
Q401 - 011, 000
Q622 - 1, 393
Q621 - 1, 393
Q601 - 1, 513
Q660 - 1, 559
Q661 - 1, 516

Diodes
D461 - 360, 360
D481 - 000, 000
D421 - 000, 000
D401 - 000, 000
D641 - 392, 392
D642 - 392, 392

Resistors
R422 - 7.8
R421 - 7.8
R402 - 6.7
R401 - 6.7
R451 - 6.1

Which ones do I need to replace (some look obvious but I am ignorant so better to ask) and is there anything else I should test? Thanks for any help.

[dick_barton]

Re: Panasonic TC-P42S30 Standby light

The ones that read 000 need to be removed and tested off board as they appear to be shorted or in parallel with a shorted component.

[nearfall2]

Re: Panasonic TC-P42S30 Standby light

Thanks Mr. Barton. I think I will replace all the 000 and the Q451. I found a magnifying glass and 401 and 402 are supposed to be 7.5 so I will replace those as well. Does anyone know of a kit with all of the below that you feel confident are a quality product. If any of you rep these I am asking you were not selling. Thanks again for any help.

Q441 - 047, 000
Q451 - 004, 360
Q422 - 000, 000
Q421 - 015, 000
Q402 - 008, 000
Q401 - 011, 000

D481 - 000, 000
D421 - 000, 000
D401 - 000, 000

R402 - 6.7
R401 - 6.7

[dick_barton]

Re: Panasonic TC-P42S30 Standby light

Repair kit available from
https://tinyurl.com/y6ckjtb3

[nearfall2]

Re: Panasonic TC-P42S30 Standby light

I messaged the company that was suggested. They don't carry the diodes or resisters. They also said that diodes don't go bad until people try to take them off the board. I really don't want to buy a kit and then have to buy another with the components the first one doesn't have. Does anyone customize kits with the parts you want not just what they think you need? I know that some parts will test out OK because they are in parallel but I'd rather pay more to have everything I may need before I start.

[zens electronics]

Re: Panasonic TC-P42S30 Standby light

Hi

Try Ohm supplies They sell quite comprehensive kits , that cover most eventualities , on these types of boards .

[dick_barton]

Re: Panasonic TC-P42S30 Standby light

I messaged the company that was suggested. They don't carry the diodes or resisters. They also said that diodes don't go bad until people try to take them off the board. I really don't want to buy a kit and then have to buy another with the components the first one doesn't have. Does anyone customize kits with the parts you want not just what they think you need? I know that some parts will test out OK because they are in parallel but I'd rather pay more to have everything I may need before I start.

Thats interesting since it's the first model number given in the list!

[nearfall2]

Re: Panasonic TC-P42S30 Standby light

Hi

Try Ohm supplies They sell quite comprehensive kits , that cover most eventualities , on these types of boards .

I took a quick look and they seem to sell a lot of individual components so it should be easy to add to a kit. Thanks.

[tvtimmy]

Re: Panasonic TC-P42S30 Standby light

You know that they are located in England, right?

[zen]

Re: Panasonic TC-P42S30 Standby light

Yes , sorry , forgot to mention they are UK based company.

Must be companies in the States offering similar kits , i would imagine .

[nearfall2]

Re: Panasonic TC-P42S30 Standby light

Thats interesting since it's the first model number given in the list!

From their message: "It is extremely unlikely you need replacement diodes, for example. They hardly ever go bad - mostly when people try to desolder a leg from them to see if it is indeed shorted."