Panasonic 50" TH-P50V10 7 flashes

[stuee]

Hi all.
I have done a few searches on the forum and read a few posts but still at a loss on what to try next.
Turn on the tv the green flashes fast for a few seconds then the red flashes 7 times.
I started on the SU / SD / SC isolation with the jumper.
SC only - turned on but squeel noise from the SC board.
SC + SD - 7 flashes
SC + SU - worked for a few seconds then pop and now 7 flashes :/


I have gone through the pocket manual i found on a link with the tests and got these results

SU
Pin2 + VF GND 14.1 ohm

SD
pin9 - VF Gnd 34.1 ohm


sc
sc42 vf + pin 3 2.95k
" " + pin 5 5.51k

So as the manual says the SD and SU is bad and the SC is ok.
But why did it pop the SU board.

Im not an expert tech but know enough to see me through everyday life

WOuld someone have any suggestions what to try / test or replace.

thanks in advance.

[tw2005]

Re: Panasonic 50" TH-P50V10 7 flashes

Hi all.
I have done a few searches on the forum and read a few posts but still at a loss on what to try next.
Turn on the tv the green flashes fast for a few seconds then the red flashes 7 times.
I started on the SU / SD / SC isolation with the jumper.
SC only - turned on but squeel noise from the SC board.
SC + SD - 7 flashes
SC + SU - worked for a few seconds then pop and now 7 flashes :/


I have gone through the pocket manual i found on a link with the tests and got these results

SU
Pin2 + VF GND 14.1 ohm

SD
pin9 - VF Gnd 34.1 ohm


sc
sc42 vf + pin 3 2.95k
" " + pin 5 5.51k

So as the manual says the SD and SU is bad and the SC is ok.
But why did it pop the SU board.

Im not an expert tech but know enough to see me through everyday life

WOuld someone have any suggestions what to try / test or replace.

thanks in advance.

So even though it made a noise did the TV stay on with no error blink when you isolated the buffers and jumped SC50?

[stuee]

Re: Panasonic 50" TH-P50V10 7 flashes

It stays on when i isolate the buffers and jump sc50 but makes the squeel noise and no red flashes

[tw2005]

Re: Panasonic 50" TH-P50V10 7 flashes

Hard to say but I think my G10 may have done something similar and I blew up my buffers in the process of repairing that board.

You definitely need buffers and bad buffers will trigger 7 blink as too sc but if it does not with it bypassed it should be ok.

the lower spec model buffers would work but they'll be minus the heat sinks.

[tw2005]

Re: Panasonic 50" TH-P50V10 7 flashes

Actually it was a G15 I had. Very close to the G10 except it has LAN and thinner so the heatsinks on the SC are a lower profile.

[stuee]

Re: Panasonic 50" TH-P50V10 7 flashes

thanks heaps for your input. IUs there anything i can test ior replace on the SC board as a preventative maintenance, i dont want to order 2 new buffer boards and it pops them both like it did in the test. cheers

[tw2005]

Re: Panasonic 50" TH-P50V10 7 flashes

thanks heaps for your input. IUs there anything i can test ior replace on the SC board as a preventative maintenance, i dont want to order 2 new buffer boards and it pops them both like it did in the test. cheers

I'm not sure. I'm working on the fact that the safety ccts if the voltages go out of range it shuts down suggesting yours is ok.

I killed mine when I got frustrated with the board and bypassed the safety cct that's when mine blew.

Did you get this broken to fix or is it yours? Like the panel is not cracked or shorted?

Shorted panels can blow the buffers . Maybe running 1 buffer is a bad idea. I know I prefer not too.

[tw2005]

Re: Panasonic 50" TH-P50V10 7 flashes

this is out of that G15 thread, you see I mention SC was noisy on a sc50 bypass.

interesting update. I've made what appears a real cluster of this but I now have a running SC, no blinks, no picture.. SD/SU are shot.. both shorted and I'd like to think I checked them properly as not but only gave them a quick continuity check between vfg and the outputs.

anyway, I'm not going to be exact on what exactly was faulty but have a fair idea.

Originally

Q661 RJP6065, shorted_..I've used a RJP63F3A which is the newer version .
replaced Q818 2SK3018, used 2N7002
Q702 2PD601 was short, IC773 TC7SH14F was shorted Vcc-gnd(41ohms),
Replaced Q701 MMBTA92

Replaced all 78L05 regs( they appeared ok) IC724,725,771
Replaced all TC7SH14F _ IC773 bad , others looked ok, IC464,465,564
Replaced TC7SH00FU - IC691 NAND
Replaced IC521 M81707FP, used M81737FP which is same pinout higher current output
Replaced Q551 ( looked ok)

Replaced Q660,601, RJK6026 ... I had none and used STP10NK60ZFP 600V 10A N FET.

Replaced D618,652 .. RF101L4S 400V 1A super fast rectifer.

SC50 buffer bypass(buffers now shorted), Powers on, Sc is a bit noisy and yet to see how the picture is.

voltages are now:

TPVsus 198.7V
TPVscn -41.1 (- 40V ± 6V)
TPVAD -186.1 (- 185V ± 2V)
TPVe 135.2

MID is now 99.7V as predicted by Tom about 50% Vsus.

[stuee]

Re: Panasonic 50" TH-P50V10 7 flashes

ive just ordered 2 buffer boards. I still need to work out what to do with this SC before i plug in the buffers

[stuee]

Re: Panasonic 50" TH-P50V10 7 flashes

Also i picked up the Tv for $40 and its not cracked.... that i can see and was told.