Panasonic Viera TX-L32E3B won't power up, green LED flashing

[Diah]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

when freeze didn't work then heat ( reflow ) MB
BL_SOS not the case because blinking timing at BL_SOS 4 seconds ..you wrote it blinking fast..

its main board.. replace it or try as above take the heat sink plate with air gun heat rom cpu.. & any IC mounted with out legs.

[lamlash]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

OK thank you very much for your help. I've reached the end of troubleshooting now and will tell my friend that we can take a chance on a Board A with the exact same part number. There are a few on ebay which are claimed to be tested and working for around £30. Or he can buy a new TV!

Thanks again

[lamlash]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

Wait - I have it working... kind of. I just tried the reset procedure one more time (power plug out, hold down vol-, AV and power button then plug in power again). And it works.

But now I have a screen that is a little dark on the left hand side, like the left hand strip of LEDs is not as bright. Otherwise working perfectly.

[nomoresonys]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

If you can, VERY CAREFULLY go into service menu and see if you have any lamp errors, be very careful what you do in service menu if you're not careful you can brick the tv.

[lamlash]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

Thanks, I can't find the relevant page in the service mode that shows if there are lamp errors.

Is it possible the LEDs are all working but I somehow mis-assembled the panel? I've had the entire TV in pieces!

[nomoresonys]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

Try a factory reset.

[Diah]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

take it in piece again LOL... and check BL socket... now you know your friend TV issue
for record try please to upload photos always on any trouble you like to resolve over this forum. cheers

[nomoresonys]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

Wondering if you have a backlight issue, some testing here, there's some simple tests that don't require stripping it down: https://www.youtube.com/watch?v=6hQOiN4-XPk

[nomoresonys]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

Self test here: https://www.youtube.com/watch?v=mtSvmknlvUU

[lamlash]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

Hi guys, the TV is now fixed. I stripped it apart again and refitted the polariser/diffuser sheets more carefully. Picture is perfect now.

I can't say 100% what the fix was. The reset procedure (vol- / AV / power button) eventually did it but that only worked after stripping the whole TV to pieces and re-assembling. Maybe there was a bad connection on the LED strips, maybe the freezing of the EEPROM was effective and just needed the reset procedure too.

When I get time later I'll post up a few lessons learned for others who have no experience of dismantling Panasonic edge lit TVs. In the meantime thanks again to all those who assisted.

[nomoresonys]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

More than likely loose connection in backlights, good practice is put a little tape on those difuser sheets to keep them in order.

[budm]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

Hi guys, the TV is now fixed. I stripped it apart again and refitted the polariser/diffuser sheets more carefully. Picture is perfect now.

I can't say 100% what the fix was. The reset procedure (vol- / AV / power button) eventually did it but that only worked after stripping the whole TV to pieces and re-assembling. Maybe there was a bad connection on the LED strips, maybe the freezing of the EEPROM was effective and just needed the reset procedure too.

When I get time later I'll post up a few lessons learned for others who have no experience of dismantling Panasonic edge lit TVs. In the meantime thanks again to all those who assisted.

So did you take the Voltage readings on the LED connector and other connectors for future reference?

[lamlash]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

So did you take the Voltage readings on the LED connector and other connectors for future reference?

With the LEDs on:
The anode (red wire) for the LEDs was at 86V with respect to chassis ground
The cathodes (blue wires) were at 10.8V with respect to chassis ground

Sorry I didn't record all of the other vbltages again.

[budm]

Re: Panasonic Viera TX-L32E3B won't power up, green LED flashing

With the LEDs on:
The anode (red wire) for the LEDs was at 86V with respect to chassis ground
The cathodes (blue wires) were at 10.8V with respect to chassis ground

Sorry I didn't record all of the other vbltages again.

That Voltages are about right.