Panasonic TCP-42S2 6blink

[bikerbuddy]

Re: Panasonic TCP-42S2 6blink

Every think ok now because SC and SS stay on,green light

[tw2005]

Re: Panasonic TCP-42S2 6blink

I see the pic, so yeah that's correct part. does anything in that photo I posted help at all? I'd be intersted in some resistance readings, P15v,P5v, IC771, and across those 5 pin pnp/npn transistors. I've marked it out best I could. Did you get any extra parts to allow for a few attempts?

[tw2005]

Re: Panasonic TCP-42S2 6blink

Every think ok now because SC and SS stay on,green light

hang on, you confuse me, shorted parts and it's working or you just replaced those again and all good??

[bikerbuddy]

Re: Panasonic TCP-42S2 6blink

If I connect back the A board TV shut down with 6 blink , I removed the two Buffer cable and connect back SC20 , power up and still shut down with 6 blink so what is your input on the a board .

[bikerbuddy]

Re: Panasonic TCP-42S2 6blink

Yes I read some of your post and there is where I went and look for the 5 leg npn pnp , and yes as u mention D451 was shorted again.

[tw2005]

Re: Panasonic TCP-42S2 6blink

If I connect the back the A board TV shut down with 6 blink , I removed the two Buffer cable and connect back SC20 , power up and still shut down with 6 blink so what is your input on the a board .

I don't want to jump to the A board yet, still trying to work out how the TV fired up with no SC20 lead connected but everything else was and no blinks, sc and ss energised? that's weird. if sc20 was removed it should have gone 6 blink that's part of the built in shutdown features.

I'll have a look at the schematics for the A board but this is a new one for me.

[bikerbuddy]

Re: Panasonic TCP-42S2 6blink

I do not mean that the tv power up with bright screen ,I meant thet the tv stay on no blink red light on and SC and SS board with green light
sorry for the miss understanding.

[tw2005]

Re: Panasonic TCP-42S2 6blink

The signal goes pretty much direct to IC9004, not much you can do there except replace that IC which you may have to go OEM. Still makes no sense to me though. If that Ic was defective and creating a false detect then I'd expect it to trip with SC20 / A20 removed

[bikerbuddy]

Re: Panasonic TCP-42S2 6blink

TW2005 Previously the tv power up for a few seconds then start 6 blink and green light on SC and SS will die slowly , after repairing the SC board now the tv power up and stay on red light no blink and the Sc and SS light green does not die but if i connect sc20 tv start 6 blink

[tw2005]

Re: Panasonic TCP-42S2 6blink

I do not mean that the tv power up with bright screen ,I meant thet the tv stay on no blink red light on and SC and SS board with green light
sorry for the miss understanding.

And all that's with Sc20 removed? there's nothing else been removed say anything to do with the C buffers?

If you're certain the Sc is good, you could earth out the SOS6 line and that will bypass the sos6 trigger, is risky. If there is anything wrong with the Sc it will blow and I have done this for a 7 blink with no issue however I had 2 x 5081 boards I repaired with issues - 6 blink - the first fired up with bad image but nothing blew, turned out I had a lot of residue under IC521 the somehow was slightly conductive, the other, forget to replace D451, it fired up bad image, then a lot of smoke and burnt board and fused some of the tracks. Not my smartest moment.

[bikerbuddy]

Re: Panasonic TCP-42S2 6blink

I am looking at the Protection circuit block diagram and it is indicating that SOS6 blink and is pointing at IC9003

[tw2005]

Re: Panasonic TCP-42S2 6blink

[QUOTE=bikerbuddy;510148]TW2005 Previously the tv power up for a few seconds then start 6 blink and green light on SC and SS will die slowly ,- understood
after repairing the SC board now the tv power up and stay on red light no blink and the Sc and SS light green does not die but if i connect sc20 tv start 6 blink - If I try this on mine I get 6 blink straight away, the LEDs on both SC and SS will give the impression they are staying on but thats because the cct is hold charge and they take a while to bleed off. How long did you watch them fully lit? This is really weird condition you have, not sure If i'm going to work it out for you[/QUOTE.]

[tw2005]

Re: Panasonic TCP-42S2 6blink

I am looking at the Protection circuit block diagram and it is indicating that SOS6 blink and is pointing at IC9003

enters IC9004 first? then to IC9003

[bikerbuddy]

Re: Panasonic TCP-42S2 6blink

tw 2005 I will do some voltage test later on all the tp on the sc board just to be sure all my voltage are ok , and we can pick it up another day

mean while thanks for all your help.

[bikerbuddy]

Re: Panasonic TCP-42S2 6blink

Missed your last post, the lights on the Sc & SS stay on as long as the tv is on.

[tom66]

Re: Panasonic TCP-42S2 6blink

To check if SOS6 circuit is bad, check voltage across blue poly caps, near ERC IGBTs.

If operating correctly, should be between 40% and 60% of Vsus (about 200V, so between 80 and 120V)

If you bypass SOS6 you could well have blown sus IGBTs after a few seconds, the ER circuit is there to reduce the stress on them, without it they end up driving the panel themselves, can be bad. On some sets it will just cause image distortion but on other sets it will blow parts up.

[tw2005]

Re: Panasonic TCP-42S2 6blink

Missed your last post the, lights stay on as long as the tv is on

yeah, I'm flying out today but should get online at some point. been waiting a couple od days tosee where you got, definitely not the result I was expecting. I'm sure tom will be intrigued. I'll check out a training guide and see if that gives a clue but maybe check the levels on pin 28 and pin 5 on IC9004 with sc20 removed and then again with it connected.

[tw2005]

Re: Panasonic TCP-42S2 6blink

guide

from that some suggestions they make

An increase or reduction of the Energy Recovery Circuit output (MID).

Open connection between connector A20 on the A board and SC20 on the SC board. this is what should happen with sc20 removed

Open connection between any of the ribbon cables on the C boards and the A board.

Open connection between the ribbon cable/cables interconnecting the C boards. Wrong diagnostic by the A board.

Maybe it's a straight through signal through IC9004

6 Blinks SOS: Pin 65 of the CPU IC9003 monitors the status of the SC board. During normal operation, a low is applied to pin 65. If the SC board becomes defective, a high is provided to pin 65. As a result, the unit shuts down and the power LED blinks 6 times.
The TC-P42X2/C2 series have an energy recovery circuit in the SN boards. This circuit monitors the scan board output and the sustain board output. Any abnormality on this circuit will trigger the 6 blinks code. If SC20 is disconnected or is not seated properly, the TV shuts down with 6 blinks.

[tw2005]

Re: Panasonic TCP-42S2 6blink

"The voltage from SC20 is connected to pin 65 the Panel CPU (IC9003) in the A board via the DC level shifter section of the multi-functions IC (IC9400).
When pin 65 of the panel CPU (IC9003) goes high, the TV shuts down and the power LED blinks 6 times."

slide 64

[tw2005]

Re: Panasonic TCP-42S2 6blink

slide 66

Verify that all the cables on the SC board are properly seated. Also check the ribbon cables and connectors on the A and C boards. Unplug the TV and disconnect connector SC20 on the SC board and connector C10 on the C1 board. Plug in the TV and turn it on

Did the number of blinks change to 8 blinks?

yes - SC

no-Are there 15V and 5V at the SC board. (See the previous page for test points location)

yes - A board

no- Check connections between the P and SC boards. If ok, replace the P board