panasonic th-50u30a no blink code

[attainteddragon]

Re: panasonic th-50u30a no blink code

jumping the ps is the last option at the moment, but if i do, it will be completely isolated.

[tw2005]

Re: panasonic th-50u30a no blink code

i'll see what i can find on the p7 signal path.

tw, if you isolate the ps on yours, is the main filter cap voltage stable?

You got me, which cap is main filter cap and can it be done with board fitted?

[attainteddragon]

Re: panasonic th-50u30a no blink code

i was just wondering what you had on c021 or c022 without being connected to other boards, so it will have stb only and i'm expecting a stable 320v.

[Moreno83]

Re: panasonic th-50u30a no blink code

Thats funny. The S30 does have 5v on P34.

https://www.badcaps.net/forum/showth...629#post686629

I believe that basics on these 2011 models are all the same. The 5V goes into mainboard which turns on the rest of the voltages?

[tw2005]

Re: panasonic th-50u30a no blink code

Thats funny. The S30 does have 5v on P34.

https://www.badcaps.net/forum/showth...629#post686629

I believe that basics on these 2011 models are all the same. The 5V goes into mainboard which turns on the rest of the voltages?

Sorry,I had another look, realised in my haste I only measured this with it turned on as the main switch which grounds pin 1 of P34.

yes with the master switch off and plugged in 5v is at pin 1 and when pin 1 is grounded the standby led is lit and the relays trigger

[attainteddragon]

Re: panasonic th-50u30a no blink code

pin 1 of p34 does have 5v when disconnected.


i took some measurements of ic5000 and if they dont point me in the right direction, they might help someone else.
pin 30 stb5v 4.88v
pin 29 stb 3.3 3.35v
pin 28 stb 1.2v 1.18v
pin 27 stbrst 3.2v
pin 26 cd 4.8v
pin 25 mute_vcc 1.92v
pin 24 monitor_mute 1.2v
all other pins are negligible.

which pin should the on command come from?

[tw2005]

Re: panasonic th-50u30a no blink code

Pin 4 DCDCCTL or DCDCEN(enable). Reading it that switches on a number of the regs 3.3v. 1.1v P5v, etc.

Then it suggests once the sub voltages are confirmed more commands are sent for the 15V, Vda Vsus to come on, it's in that guide.

As futile as this may be have you tried disconnecting sc2,ss11,p35, 3 white ribbons at the A board and tried if that turns on?

Does the F15v come up and hold for a while? I'm thinking if you're seeing those stb voltages it must because I think it's the F15V they are derived from.

[tw2005]

Re: panasonic th-50u30a no blink code

i was just wondering what you had on c021 or c022 without being connected to other boards, so it will have stb only and i'm expecting a stable 320v.

I did not bother isolating the boards as I did not see the point but 337v and that is only present when the relays latch on initial power on and the F15v is generated. If the TV is not turned on from standby then they de energise and the 337V fades.

If your TV relays are cycling, I still think A board is not seeing or completing it's cycle in preparation to turn on and resetting. That could be a load of rot but that's my gut feeling.

Did the TV fail after electrical storm or surge?

[attainteddragon]

Re: panasonic th-50u30a no blink code

the 15v is present on various parts of the board, but never on a connector.

i only get 1 random click from a relay now and then, never as a start up sequence.

i never see 240vac on the bridge, only maxed at 41vac.

i dont know the history behind this one, but i think that im looking at a multi board failure, so a lightning strike sounds very probably if that is the case.

[tw2005]

Re: panasonic th-50u30a no blink code

the 15v is present on various parts of the board, but never on a connector.

i only get 1 random click from a relay now and then, never as a start up sequence.

i never see 240vac on the bridge, only maxed at 41vac.

i dont know the history behind this one, but i think that im looking at a multi board failure, so a lightning strike sounds very probably if that is the case.

But you see 320v on those caps so where does that come from?

[attainteddragon]

Re: panasonic th-50u30a no blink code

its bazaar. when i get the relay click, the filter caps do jump to 320 then bleed off and on the ac pins i saw it jump to 65vac that time. un les my meter just cant pick it up, but it only seems to drift off slowly.
while this happens, i still have 320v on those diodes, even though at that time i do not have that much value on the main filter caps.

i'm getting rather confused on this one.

[tw2005]

Re: panasonic th-50u30a no blink code

its bazaar. when i get the relay click, the filter caps do jump to 320 then bleed off and on the ac pins i saw it jump to 65vac that time. un les my meter just cant pick it up, but it only seems to drift off slowly.
while this happens, i still have 320v on those diodes, even though at that time i do not have that much value on the main filter caps.

i'm getting rather confused on this one.

so am I. Don't have a full schematic which is a pain. I wonder if it would be worth checking the thermal resistor is good and instead of the relays applying the 240Vac maybe solder a link across the contacts on the board to bypass them and allow the 240v to go through as soon as you plug the board in?

Once those relays latch 240v should then be on the main bridge, both relays need to latch for that to happen AFAIK.

[tw2005]

Re: panasonic th-50u30a no blink code

anyway , a bit late at night for playing with power supplies

[attainteddragon]

Re: panasonic th-50u30a no blink code

thermisters and tvr confuse me on a good day.

which one would i need to jump in this case?

[tw2005]

Re: panasonic th-50u30a no blink code

If you don't follow it's too late for my brain and eyes but the 2 relays next to the thermal resistor and in front of the main bridge.

there's the low volatge coil side that becomes an electro magnet and closes the contact side. The contact side will be switch the 240vac to the main bridge, one may do neutral and the other live but I'm not 100%.

So if the contact sides are closed with links meaning connected full time there should be 240v on the bridge and F15V should be on to.

If in doubt , leave it otherwise you may end up with a real blow up. Should be able to trace and work it out on the underside but I'm parking it for the night.

[attainteddragon]

Re: panasonic th-50u30a no blink code

it looks like you are referring to z002. jumping that one will be the equivalent to jumping the relays.

i might leave it till the morning too.

thanks for your help.

[Moreno83]

Re: panasonic th-50u30a no blink code

If the tv would be 100% working , is the led still orange or does it change to a different colour? In europe startup led is green and stays green when its on.

As i said before , i repaired the same model this week. Mine turned "on" but screen was black. Problem was the mainboard.

Do you have any voltage on SC board connector? Should be 207V on startup and 215v when it's on.

Just trying to help.

[tw2005]

Re: panasonic th-50u30a no blink code

it looks like you are referring to z002. jumping that one will be the equivalent to jumping the relays.

i might leave it till the morning too.

thanks for your help.

No I'm not talking about any diodes, I'm simply referring to the contact side of the relays and bridging those.

Trusting I've got this right I've painted your image. You should be able to simply bell thee paths out to confirm them.

As you can see if the relays are closed 240vac will be across the main bridge, not sure about the second relay where it's going but the block diagram suggests these are in series.


Done my best, I get a bit nervous fooling around on the HOT side so take care around there.

I am thinking though the F15V needs to be present at plugin, if you can manually prove that works then that would mean the A board is not doing it's job.

EDIT: I see what you're on about with the diode, both relays close but in sequence . This is not my knowledge area but it mentions one is for "Relay for prevention of inrush current", one is "Relay for AC input cutting"

[tw2005]

Re: panasonic th-50u30a no blink code

If the tv would be 100% working , is the led still orange or does it change to a different colour? In europe startup led is green and stays green when its on.

As i said before , i repaired the same model this week. Mine turned "on" but screen was black. Problem was the mainboard.

Do you have any voltage on SC board connector? Should be 207V on startup and 215v when it's on.

Just trying to help.

we have same setup, standby red, blinking green is startup, solid green and it's running. I think as he describes, it never wakes or goes to the blinking green.

[attainteddragon]

Re: panasonic th-50u30a no blink code

i have 15v at D151 (shottky), but i have not traced it further yet.
so no 15v output anywhere.
no vs or va since it doesnt turn the ps on.

i may be looking on another tangent, but my head keeps looking at why i dont have unboosted voltage on the main caps.
these tests are done with the ps out of the set, so it should have standby voltages and i would think about 320v on the main caps.
i think that the bridge is breaking down under load, though tests fine.
i have tried to show why i think that in the pics.

apologies if im going the wrong way about this.