Pan TC-P55VT50 DEAD Blinks 7 times

[Ltank]

When power is plugged in it has 5vdc standby and set turns on about 3 seconds then Shuster down. Same with both the SC and SS boards disconnected .Fans don't run either

[tom66]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

Bloody hell, new TV!
Check all of the transistors on the SC & SS for shorts.

[Ltank]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

Section 8.1 shows how to test if its the SC or the SU/SD boards. (7 Blinks) But I disconnected both the SC and the SS board and the set tries to power up and still shuts down. I woulld think that it would stay on. The service info says nothing about jumpering the P,S. for testing and the connectors are not labeled either. I would like to know if its the PS if I dont find any shorts on the SC or SS boards. I will check for shorts on monday. Wouldnt the PS run if the boards with the shorts were disconnected?
I used to be able to check alot of power supplies to see if they were good before looking for shorts. if I find a short and repair it then there still may be a PS problem but would not knoow untilliits all back together for a test.

[tw2005]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

I think these later models are a bit trickier for isolating the boards. I'm reading if Sc2 and SS11 are disconnected you get SOS7.

Is that what you have?

I'd try the SC50 jumper with the SD/SU disconnected and the 4 Vfgnd screws removed. If you still got SOS7 still that would suggest the Sc but you'd still have to resistance check the buffer boards.

Have you downloaded the 2012 guide? Not exactly for the VT but may help.

I think PSU is very unlikely for 7 blink.

[Ltank]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

The set came in this afternoon and I was trying to get the PS tested first. I saw the jumper test after I got home. I might work on it Saturday but that's my day off. The PS connections voltages were not labeled.

[tw2005]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

I think the only voltage worth checking would be Vsus at this stage which you could backprobe SC2/P2, SS11/P11. If there were any of the sub votages missing you'd be getting those blink codes before a 7. I would expect Vsus to briefly come up at startup and drop with the shutdown.

As for the pinouts, try the block diagrams. Should be enough info in there if you have no schematics.

[freakaftr8]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

Just repaired my tc-p55ut50 and it was a shorted su board. I'd advise checking the ground lug as the big screw that attaches the su and sd to the sc board on diode check mode. (Beep mode) on ohm meter and red lead against pins on the ribbon cable connectors. You will have to likely the flaps a little to access the pins but when you do this run the red lead across the pins on each connection and if.you hear a beep there shot. Replace

Internally these TVs are very similar.

[Ltank]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

I tried the jumper test on SC to test the SU and SD but the SC was shorted shutting down the PS and causing the test to fail. There are a bunch of shorted IC in parallel. I spent a hour trying to find the bad part. Some were difficult to remove and the short was still. 01 ohms to gnd. I ordered another board. The P.S. would not come up with the shorted SC board or with it out of the circuit. Gotta figure how to test the PS by it self. No pins were labeled.

[Ltank]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

I got the replacement board in and it works fine, got the two year warrenty too. I found the short on the SC board. Three DG301, Q422, Q423 and Q424. Digikey and Mouser dont have them. Cant find a PDF on them to see what they are and what the specs are to replace them. Of the five different power chips on the board only the RFUH20 was available in the US. The RJU36B4S,
45F132, DAF30A and the RJP30Y2A were not available and I was not able to get a PDF file on them to look for a substtute part. Whay cant they use readily availbale parts!

[tw2005]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

I got the replacement board in and it works fine, got the two year warrenty too. I found the short on the SC board. Three DG301, Q422, Q423 and Q424. Digikey and Mouser dont have them. Cant find a PDF on them to see what they are and what the specs are to replace them. Of the five different power chips on the board only the RFUH20 was available in the US. The RJU36B4S,
45F132, DAF30A and the RJP30Y2A were not available and I was not able to get a PDF file on them to look for a substtute part. Whay cant they use readily availbale parts!

The DG301 is a Panasonc IGBT, maybe why it's hard to locate. It's a 330V 40A, (250A peak pulse)

The full number is DG3C3010CL. Discrete components can be ordered through Sears, Encompass spares, SJ(potentially in the future) http://www.shopjimmy.com/panasonic-d...transistor.htm
Cumberland Consumer Electronics, etc.

Other places to try would be Ebay or UTSOURCE (chinese suppliers)

The 45F132 is a Toshiba GT45F132, will be a 45A 360V IGBT





A search would have given you this.

https://www.badcaps.net/forum/showth...ighlight=dg301

RJU36B4S sounds like a RENESAS Fast recovery 360v 20A, DAF30, DA3DF30A , 360V 20A Panasonic production.

RENESAS , RJP30Y2
http://www.ebay.com.au/itm/RJP30Y2A-...item2ed10994e7

[tw2005]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

With the RFUH20, the suffix is important too so RFUH20NS3S is a 350V 20A, single diode,

https://cdn.badcaps-static.com/pdfs/...425be7f3eb.pdf

Was hasty with the RJU36B4S , the 1S is 20A, 2S is 40A. Not sure about the 4S

[Vassertvtech]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

Tc-p55vt50 dead no power. Red led not lit.

[Neelix]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

Tc-p55vt50 dead no power. Red led not lit.

Attach is service manual. You have meter to measure with? At connector P6 on power board, measure DC voltage by pins 5 and 6

[Ltank]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

All the voltages are good. Jumpered the Test Pattern and screen is good. Problem got to be the Main Board. I will probably send it out for repair.

[Ltank]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

Sorry wrong tv .Hard to keep up sometimes

[SJWINSLOW]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

Sorry for reviving an old thread.

I too, have a Panasonic TC-P55VT50.

It's giving a 7 blink SOS code.

I've replaced the SC board but no change.

When the SC board is remove from the circuit the SOS changes to 8 blinks.

Is there a link somewhere that has the diagnostic procedures with the blink code information to narrow down the offending PCB?

Any suggestions of what to try next?

Thanks for any information that you can provide.

Regards,

Steve Winslow

[tw2005]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

Sorry for reviving an old thread.

I too, have a Panasonic TC-P55VT50.

It's giving a 7 blink SOS code.

I've replaced the SC board but no change.

When the SC board is remove from the circuit the SOS changes to 8 blinks.

Is there a link somewhere that has the diagnostic procedures with the blink code information to narrow down the offending PCB?

Any suggestions of what to try next?

Thanks for any information that you can provide.

Regards,

Steve Winslow

I would do the sd,su isolation and jumper sc50.

That is disconnect those 2 boards from the SC, 3 connections, remove the Vfg bolts, (4 bolts that earth the sd/su to the SC) on the SC small 2pin white connector, those 2 pins need to be shorted together, Turn th eTV on and if it turns on with no error then you have bad buffer board/s,

Looking that way if replacement board is good and still 7 blinks. Above test though hopefully will clarify it for you

[pascalo]

Re: Pan TC-P55VT50 DEAD Blinks 7 times

https://www.youtube.com/watch?v=-JVLWpcIxJQ&t=16s