TH-42PX80U repair help


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TH-42PX80U repair help

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pawel_podgorski
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Aug 13, 2011, 1:52 AM

Post #1 of 15 (3929 views)
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TH-42PX80U repair help	Can't Post

1. Story : working fine when i went to holiday, after come back didn't...
2. Symptoms : no picture, no sound, no OSD (tested on HDMI, and photos from SD card according service manual SD card is the simplest way to get picture).
3. Time line :
a) power on
b) relays click (two quick one and one slow)
c) led is shining, no nay code
d) backlight get bright, after while gets darker
e) led lights shine on back (two one)
f) tv stays in this state for a 5 min
g) tv shuts off relays click again same way, front led is gone, tv is dark
4. What's tested :
after disconnecting everything works like service manual say - tv give right code, fuses are ok, one capacitor was little round, i replace it still same thing

Any ideas, ? Unsure

greetings Pawel

P.S. service manual shows to replace BOARD A - main board any idea where to buy this ?? maybe used one ? cheap Sly

(This post was edited by pawel_podgorski on Aug 13, 2011, 2:05 AM)

74f100
Enthusiast

Aug 13, 2011, 3:01 AM

Post #2 of 15 (3921 views)
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Re: [pawel_podgorski] TH-42PX80U repair help [In reply to]	Can't Post

Also look in the service manual for a force run by disconnecting connectors running from the A-board to the power supply.

In this instance, if it is continually blinking, then comes on under force run, then it is a pretty good likelihood of a bad A-board.

Jim
HDMI not working

pawel_podgorski
New User

Aug 13, 2011, 3:26 AM

Post #3 of 15 (3917 views)
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Re: [74f100] TH-42PX80U repair help [In reply to]	Can't Post

Thank U sir for quick respond. I will test it tomorrow and let U know. Any ideas where I can buy this A board ?

74f100
Enthusiast

Aug 13, 2011, 3:34 PM

Post #4 of 15 (3905 views)
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Re: [pawel_podgorski] TH-42PX80U repair help [In reply to]	Can't Post

Encompassparts.com

shopjimmy.com

tristatemodules.com (you may get a bad one at first)

You do have the 80u and not the 80ua correct.

jim
HDMI not working

pawel_podgorski
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Aug 13, 2011, 4:40 PM

Post #5 of 15 (3903 views)
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Re: [74f100] TH-42PX80U repair help [In reply to]	Can't Post

80U
Found on eBay used one 100% working for 60$

Still I have test it first before I order
Thank you for help
I will let u know what's happened when I disconnect power from A board

pawel_podgorski
New User

Aug 16, 2011, 12:06 AM

Post #6 of 15 (3888 views)
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Re: [pawel_podgorski] TH-42PX80U repair help [In reply to]	Can't Post

Am looking on TV right now. So I try disconnect pwr from A board
to A board going 2 connectors :
A25 and A7 A6 (together)
when i disconnect all Tv isn't doing nothing
when i disconnect just A25 relays on, and i get 12 blinks of led on front
when i disconnect A6,A7 nothing is happened
any clue ?? looks like some part of A board is working

74f100
Enthusiast

Aug 16, 2011, 4:26 PM

Post #7 of 15 (3879 views)
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Re: [pawel_podgorski] TH-42PX80U repair help [In reply to]	Can't Post

Look in the manual, it should give a troubleshooting guide on which cables to disconnect.

Jim
HDMI not working

pawel_podgorski
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Aug 18, 2011, 2:19 AM

Post #8 of 15 (3868 views)
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Re: [74f100] TH-42PX80U repair help [In reply to]	Can't Post

am siting on front of that and i don't have any idea witch one is main power service manual don't shows nothing or i don't see. If U give me a Your e-mail i will send that to You, maybe am blind. If U can spend 10 min and tell me witch one.. please help
pawel

74f100
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Aug 18, 2011, 5:14 AM

Post #9 of 15 (3866 views)
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Re: [pawel_podgorski] TH-42PX80U repair help [In reply to]	Can't Post

When I get back home, I'll look up the info on that model.

Jim
HDMI not working

pawel_podgorski
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Sep 2, 2011, 1:44 AM

Post #10 of 15 (3814 views)
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Re: [74f100] TH-42PX80U repair help [In reply to]	Can't Post

Ok. So receive A board,
TNPH0716 1A
My A board from tv is
TNPH0716 2A
one connector is missing.

So i try. Tv on. Sound is OK, Picture is messed up first few blocks.
I will call company tomorrow, we well see what is that story with 2A and 1A
P.s. i can send a pictures but i don't know how to post it so if something let me know

(This post was edited by pawel_podgorski on Sep 2, 2011, 1:46 AM)

74f100
Enthusiast

Sep 2, 2011, 2:13 AM

Post #11 of 15 (3812 views)
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Re: [pawel_podgorski] TH-42PX80U repair help [In reply to]	Can't Post

That can definitely be important.

Jim
HDMI not working

pawel_podgorski
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Sep 2, 2011, 2:24 AM

Post #12 of 15 (3810 views)
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Re: [74f100] TH-42PX80U repair help [In reply to]	Can't Post

sarcasm ? no need - better help me that will be a more producible

pics are in :
bezdomny.cba.pl

74f100
Enthusiast

Sep 2, 2011, 2:33 AM

Post #13 of 15 (3809 views)
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Re: [pawel_podgorski] TH-42PX80U repair help [In reply to]	Can't Post

Not at all,,, the revision numbers can be important. I don't keep up with all the different revisions for each model, not really possible.

If a plug is missing, then often an important part of the circuit is missing.

Jim
HDMI not working

pawel_podgorski
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Sep 2, 2011, 3:54 AM

Post #14 of 15 (3806 views)
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Re: [74f100] TH-42PX80U repair help [In reply to]	Can't Post

Whell then You saw pics. If screen will be div on columns w inch wide. First is ok then second is mixed with third and rest is fine. OSD looks like go 3 or four columns pass the screen on left side.
On old crt tv there was offten variable resistor to move screen left or right.

But any way I will call company and I will see what they say.
Thx for re
P.S. go on http://bezdomny.cba.pl and tell me what U think.
3 pic's in big zoom

(This post was edited by pawel_podgorski on Sep 2, 2011, 3:57 AM)

pawel_podgorski
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Sep 4, 2011, 1:53 AM

Post #15 of 15 (3795 views)
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Re: [pawel_podgorski] TH-42PX80U repair help [In reply to]	Can't Post

So : nobody tell me about suffix on board, so i order wrong one and i have to pay restack fee when i will give back.
Good part is i know in 100% what is wrong, its the main unit
bad can't find TNPH0716 2A without any suffix
if anybody know a place when i can find that main unit....

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