Panasonic tx-p50x60b 7 blinks

[comptek]

Hi guys got this in today and it has 7 blinks, i checked over the sn board, there are no shorts on the fets or the big DAF304 diodes...
Disconneted all cables to sn board, green lights flashes very quickly then goes to 6 blinks

test point voltages are as follows

TPNS1 = -232V THEN DROPS
TPVAD = -232V THEN DROPS
SRV VFO = -232V THEN DROPS
SRV VF5V = -232V THEN DROPS
SRV P15V = 15V THEN DROPS
SRV VSUS = 184 THEN DROPS
SRV LED LIGHTS BUT LOOKS DIM

does this mean the sn board is shot ?

regards Gary

[ReeceyBurger123]

Re: Panasonic tx-p50x60b 7 blinks

Test Vs Us input for S/C to Gnd on SN also do the same for SS if shorted, the boards are failed. 7 blinks normally is SN alot of the time.

[comptek]

Re: Panasonic tx-p50x60b 7 blinks

Test Vs Us input for S/C to Gnd on SN also do the same for SS if shorted, the boards are failed. 7 blinks normally is SN alot of the time.

Reece you on about the (power plug pins to ground on the board) ? if you are theyre ok

[ReeceyBurger123]

Re: Panasonic tx-p50x60b 7 blinks

Yes yes

[comptek]

Re: Panasonic tx-p50x60b 7 blinks

Yes yes

theyre fine

[ReeceyBurger123]

Re: Panasonic tx-p50x60b 7 blinks

Is that testing across the plug ?

[comptek]

Re: Panasonic tx-p50x60b 7 blinks

Is that testing across the plug ?

looking at the white plug ground to chasis

heatsink heatsink
=============== ======================
plug
=======
1 2 3 4

pin 1 grnd 0 ohms
pin 2] ==== 110k ohms
pin 3] ==== 110k ohms
pin 4 O/L

[ReeceyBurger123]

Re: Panasonic tx-p50x60b 7 blinks

Ok so looks like nothing is S/C to Gnd then. Before it shuts off does the screen appear to glow at all in a dark room mate ?

[comptek]

Re: Panasonic tx-p50x60b 7 blinks

Ok so looks like nothing is S/C to Gnd then. Before it shuts off does the screen appear to glow at all in a dark room mate ?

nope just rapid green then 7 blinks

[Alastair E]

Re: Panasonic tx-p50x60b 7 blinks

Find TP, VFG....

Ohm out that to all the Buffer Socket Connections. I had one of these with a dead buffer-chip, doing the seven blinker shuffle!

Problem is--the Orrible black goo they use on the Buffer-chip pins is Very hard to remove--Unlike the earlier grey silicone, I buggered the board trying to remove the chip, ended up buying a replacement...

[comptek]

Re: Panasonic tx-p50x60b 7 blinks

Find TP, VFG....

Ohm out that to all the Buffer Socket Connections. I had one of these with a dead buffer-chip, doing the seven blinker shuffle!

Problem is--the Orrible black goo they use on the Buffer-chip pins is Very hard to remove--Unlike the earlier grey silicone, I buggered the board trying to remove the chip, ended up buying a replacement...

HA HA BINGO!! third buffer chip down short on buffer socket roughly in the middle of it Dam!!
but thanks its solved the problem thanks Alastair Mate

[ReeceyBurger123]

Re: Panasonic tx-p50x60b 7 blinks

Whooo, you replacing the Ic direct Gaz ?

[comptek]

Re: Panasonic tx-p50x60b 7 blinks

nah £9 get another board as Alistair said he screwed the board up so maybe the best option to get another baord

[ReeceyBurger123]

Re: Panasonic tx-p50x60b 7 blinks

Ok, also might be best to heatsink the Ic's on the replacement board to help prevent future issues.

[comptek]

Re: Panasonic tx-p50x60b 7 blinks

Ok, also might be best to heatsink the Ic's on the replacement board to help prevent future issues.

yeah defo i have some old heatsinks around

[comptek]

Re: Panasonic tx-p50x60b 7 blinks

£9 replacement sn board all up and running