Panasonic TX-P42S10B

[noledud]

Re: Panasonic TX-P42S10B

it was me being stupid i had unpluged the power from the wall so i had no power lol sounds really daft but as i was rebuilding it i left off the odd connector so unplugging and plugging back in i forgot i took it out the wall the last time

however im now back where i started with 7 blinks but a fully built sc

[noledud]

Re: Panasonic TX-P42S10B

parts are from emos they say tested but im going to have to start from post 1 to check lol

[tw2005]

Re: Panasonic TX-P42S10B

Next time I'm going to ask the silly question then. Twice i've fallen for this hence I could reach no logical explanation, I have to assume the obvious has been checked.

Do the Sc50 jumper and Sd/SU isolation from the Sc and see if this sc is bad. you disconnect the 3 connectors to the buffers, remove 4 gnd screws that attache the SD/SU to the SC.

powerup, if it's still 7 you received a dud Sc.

Everything was connected this time at the SC for the current 7 blink?

[tw2005]

Re: Panasonic TX-P42S10B

parts are from emos they say tested but im going to have to start from post 1 to check lol

A bit hard to say how reliable Mr EMOS is but I've had DOA "tested Boards" from him and then someone took a punt of his boards when i found then for a 50G10 and they were perfect?

Who knows?

[noledud]

Re: Panasonic TX-P42S10B

yeah sorry tw2005 should double check befor i post

well SC board is good get stable power led and set powered so looking at the buffers then

[tw2005]

Re: Panasonic TX-P42S10B

yeah sorry tw2005 should double check befor i post

well SC board is good get stable power led and set powered so looking at the buffers then

some progress at least. So his buffers or yours fitted?

[noledud]

Re: Panasonic TX-P42S10B

fitted his as mine were suspect

[tw2005]

Re: Panasonic TX-P42S10B

fitted his as mine were suspect

I have to leave it here, all I can suggest is maybe work through the training guide and recheck the resistance on your boards and compare the same checkpoints on his and make a note. Or maybe contact him for help and tell him the SC has passed on it's own but 7 blink with his buffers.

[noledud]

Re: Panasonic TX-P42S10B

no problem thanks for all your help im following the guide now will beat this come to far now thanks again

[noledud]

Re: Panasonic TX-P42S10B

hi all

Ok measured resistance this was before i tried it and again now removed

DMM set to 20M

PIN 2 SU 41 i get 1.37 ohms

Pin 9 SD 42 i get 1.39 ohms

so with that alone it says bad buffers correct ?

The seller has asked me if i checked the buffer for shorts before i fitted but as i said i only checked the above

He wants to know if the boards now match shorts as it might indicate a screen problem

Can any one point out any other checks i can do ?

[noledud]

Re: Panasonic TX-P42S10B

oh images of readings in case im getting that wrong

[tw2005]

Re: Panasonic TX-P42S10B

In diode mode does this meter beep continuous if the probes are shorted?

[noledud]

Re: Panasonic TX-P42S10B

no just displays 000

[tw2005]

Re: Panasonic TX-P42S10B

try diode at the same point and in both polarities.

[noledud]

Re: Panasonic TX-P42S10B

ok

SU41 pin 2 Red - GND black i get - nothing

SU41 pin 2 black - GND red i get 1554

SD42 pin 9 red - GND black i get 023

SD42 pin 9 black - gnd red i get 023


These are on his boards mine differ slightly

[tw2005]

Re: Panasonic TX-P42S10B

give me yours

[noledud]

Re: Panasonic TX-P42S10B

SU41 pin 2 Red - GND black i get - resistance 1.37 ohms - diode nothing

SU41 pin 2 black - GND red i get diode 1496

SD42 pin 9 red - GND black i get diode nothing 1.38 ohms

SD42 pin 9 black - gnd red i get 1529

[tom66]

Re: Panasonic TX-P42S10B

Have you tried checking from the VFG to the output nodes? IMHO that is the best way of finding a shorted buffer. I had an LG buffer pulling down -Vy/Vsc and I couldn't find any shorts on the board, but once I pulled it out I found a short between the floating GND node and the topmost output pin of the top IC.

[noledud]

Re: Panasonic TX-P42S10B

Ok so pin 2 and 9 to the screen connectors?

[tw2005]

Re: Panasonic TX-P42S10B

If Tom's sugestion comes up clear I'd be tempted to try your buffers. I think the EMOS SD is looking bad, SU could be ok.