Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

[Chaks]

I am unable to find the Diode b3100 and IC FAN6754 in the service manual of TH-P42X30D.

Can someone help me to locate these components in the power board. PCB images are here:
https://drive.google.com/folderview?...FU&usp=sharing

The service manual is also available here
https://drive.google.com/file/d/0Bxc...ew?usp=sharing

Thank you

[Moreno83]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

How do you know that these components are actually in the power supply if you can't find them on the board and service manual? Btw Diode is normally D and not B.

[Chaks]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

B3100 = schottky barrier rectifier diode.
The service manual I have does not contain the power board PCB schematic or the list of the components found on the power board. May be I am having an incomplete service manual ... Anyone has a info on the power board PCB schematics please do let me know ... I am still trying on the internet.

[Chaks]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

Please help me to identify these components...
https://drive.google.com/file/d/0Bxc...ew?usp=sharing

[tom66]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

B3100 is more likely to be a ferrite bead, are you certain it is a diode?

[tw2005]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

Unless you clean off the lacquer and find markings on that diode I don't know how you expect us to help locte an item of no detail.

You're lucky I jagged this datasheet

[Chaks]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

Thanks a lot tw2005, usually the parts list in the service manual would contain the components of each and every board/pcb including the Power board/pcb but I can't find the list in the service manual or anywhere for the power board. PDF on MPF6907 was very helpful. I will try to wipe the coating on the diode and see if I can find any marking on it.

[Chaks]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

Cleaned the PCB but can't see any marking on the D301 the other ic markings are visible.
https://drive.google.com/folderview?...0k&usp=sharing

[Chaks]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

Can I test the power board in isolation. I mean just the PCb connected to mains and check for the voltages. Is this possible or I would risk damaging the power board.?
( the power board removed from the tv .... Just the power board)

[Chaks]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

Reposting the link to MPF6907 power-board schematic by tw2005

https://www.badcaps.net/forum/attach...2&d=1469322409

After trouble shooting the power board once again .... the issue seems to be somewhere along the circuit path marked in RED in the image (below).
https://drive.google.com/file/d/0Bxc...ew?usp=sharing

Standby LED is not lit-up when the tv is switched on. How can I pin-point the component that might have failed?.

[tw2005]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

The standby LED not lit does not necessarily mean no standby voltage as it's switched on or fed by the A-board.

Have you tried disconnecting p2, p11, p35 and 3 white ribbons to the A-board just in case a shorted sn or ss is causing this?

Unless IC101 is running I don't think you'll see voltage at D301 and if you start at the AC input you can see ic_start and stb_vcc which may be worth seeing what's there , I'm not really the right guy for SMPS fault finding though.

[Chaks]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

Thanks tw2005 for the reply.
I tried all the diagnostics mentioned in the service manual for trouble shooting the 'NO STANDBY LED' issue and It points to a bad power-board.
Yesterday I took it to a local Panasonic technician and he also reported a bad power-board.
I was told that the tv was working ok till about 11pm and was switched off by remote and left in stand-by state overnight and found in the morning the stand-by led was off. No response from remote or by power-on/off cycle. We hear three clicking sound when we switch on the tv that's all.

[Chaks]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

Great news tw2005.

I bought a FA5528 ( IC 101 ) in a local electronic shop and took a blind shot by replacing the IC 101 with the new one. I did this even before trying to test if the on-board IC is faulty or not.
The Great news is ... The TV now gets into stand-by mode when switched on (Solid RED light). The TV switches on after 10 seconds I hit the stand-by button on my remote and I have so far run the TV for about 10 hours in total till now and the TV is rock steady. Thanks a lot tw2005 for the help.

A 3 year old 42 inch plasma tv for 100 USD + two weeks of intermittent effort ... Has been a great bargain for me.
Thanks everyone for the help and suggestions.

[tw2005]

Re: Diode B3100 and IC FAN6754 in the P Board of Panasonic plasma TV TH-P42X30D

Great news tw2005.

I bought a FA5528 ( IC 101 ) in a local electronic shop and took a blind shot by replacing the IC 101 with the new one. I did this even before trying to test if the on-board IC is faulty or not.
The Great news is ... The TV now gets into stand-by mode when switched on (Solid RED light). The TV switches on after 10 seconds I hit the stand-by button on my remote and I have so far run the TV for about 10 hours in total till now and the TV is rock steady. Thanks a lot tw2005 for the help.

A 3 year old 42 inch plasma tv for 100 USD + two weeks of intermittent effort ... Has been a great bargain for me.
Thanks everyone for the help and suggestions.

Happy days.