panasonic th-p46x20m

[willyam1]

hi.
this came dead no stby led.
check p.s ther is 5v and by powering it with main switch nothing happand.
no hot ics in main board.
service manual needed.
willyam

[tw2005]

Re: panasonic th-p46x20m

Probably going to be a tough one to get but here's my tips. On the surface it's looking like a 720P HD 2010 Model. I have an Australian 2010, 42X20A, one of my few failures but inside yours I'm expecting a TNPA5072AB SS board, they commonly fail shorting Vsus in the 42" at least.

I'm expecting a SN board(combined SC,SD,SU) TNPA5066 no Rev stamp.

If it has these, hopefully the A-board PCB number will be TNPH0831 (Mine is not)
and that would make the US model service manual for a TC-P46C2 of some use.

I had no luck tracking down a training guide for this generation, i found one In Thai for TH-P50/42X20T,TH-P42A20T and found it near impossible to use even using a translator.

So maybe identify what boards you have especially the A-board and try a search on that and see if you get any hits. I would use the PCB number only with no revision suffix.

Rarely do I find Australian model manuals but you can still get an idea from closely related models in other markets.

[willyam1]

Re: panasonic th-p46x20m

thanks for answering.
my power supply is LSEP1287.
A BOARD IS TNPH0842.
NOTICE -when pushing mian switch can see that the 5v come back to the p.s but no clicks no stby led.
checking the A board and i can thn mesuer a small resistance 9.6ohms in one of the pwm output that is leading to the big ics i think its wrong becouse other pwmout mesered almost 1k.
willyam

[tw2005]

Re: panasonic th-p46x20m

Maybe try using a combination of manuals. TNPH0842 (42C20C/50X20C) comes up in the Chinese market, We have 0840 (42/50X20)but i think the TNPH0831 (46C2)is closer. It does not have the main switch on the A board but the rest of it looks very close. the chinese manual at least the schematics and block diagrams are still english.

[freakaftr8]

Re: panasonic th-p46x20m

Do you get any voltage at panel_main_on at power supply when you press power button?

[brnrubbr]

Re: panasonic th-p46x20m

Well, I might as well hijack this thread as it appears I have the same problem.
- 5 VDC standby good
- No click, no display with Power nor Power Button pressed
- No voltage at Panel_Main_On when Power Button Pressed

Thoughts?

[brnrubbr]

Re: panasonic th-p46x20m

I finally found some more time to check out this TV. I found an IC getting warm on the Power Board (LM7805), obviously 5VDC regulator.

I disconnected the Main Logic board and regulator stopped getting hot.

Focusing on heat, I reconnected the Main Logic board and found IC BD8656FS to be getting warm. I am guessing it is similar to a BD9796FS, but I cannot find any relevant information on the former.

[brnrubbr]

Re: panasonic th-p46x20m

Boom! Found it with help from Panasonic......
IC = C1ZBZ0004161

Hell if I know what the IC is, but given that IC part number I found this this service manual

Crossing fingers!

[brnrubbr]

Re: panasonic th-p46x20m

Even better....
tc-p46c2 Service Manual