Panasonic NV-FS90/FS100 hybrid board - UK Vintage Radio Repair and Restoration Discussion Forum

Vauxfan2k · 4th Mar 2017, 4:42 pm

Hi guys,

Took this board out my donor fs90 that I had robbed bits from.

The original fault was there was no picture on vhs or svhs at all. Suspected this board but never for round tonremoving and checking til now. There's no leaking from the caps and no damage to the ic and tracks like in pics on the other threads.

However there is a link wire from pin 10 of the centre connector to pin 1and 2 of the hybrid board. Doesn't look factory and possibly a failed repair?

The board has obviously been replaced by looking at the solders, but should pins 1 and 2 be joined and also 9 and 10? Or is it messy soldering?

Can anyone shed any light on why this might be like this?

I was hoping the board was ok to transplant into another machine.

Thanks

John123 · 4th Mar 2017, 4:48 pm

I still wouldn't trust those surface mount caps. They might look good, but given the age of the machine looks can be deceptive. Give the entire thing the once-over with an ESR meter.

I think that link wire is factory. If you look in the top-right there's a resistor that looks like an afterthought as well. Probably a later revision of the same board would have these integrated. Not uncommon!

Vauxfan2k · 4th Mar 2017, 5:02 pm

Took a chance and put it in my machine anyways as the one that came out also had the bridge wire.

Both vhs and svhs work perfectly.

Pic of Leaking caps and damage to smd's on the old board

The soldering on the old boards hybrid chip was factory where as the replacement has been replaced at some point and looks good with the meter.

HamishBoxer · 4th Mar 2017, 8:55 pm

Easy way with any elec caps,is put a soldering iron on the joints and it quickly puts its hand up if duff.An anonymous sizzle.

Rennie93 · 4th Mar 2017, 11:19 pm

Quote:

Originally Posted by John123

I think that link wire is factory. If you look in the top-right there's a resistor that looks like an afterthought as well. Probably a later revision of the same board would have these integrated. Not uncommon!

Yeah. My Fs100 and 200 have those as well. I wondered whether they were a dodgy repair!

Vauxfan2k · 5th Mar 2017, 12:23 am

Have made another working board by combining the good caps from each onto the board with the good tracks. Fiddly job with my iron tip being a bit on the large side but it's working great. Wish I had done this sooner. The anticipation was worse than the job itself.

ben · 10th Mar 2017, 12:57 am

I hope you didn't reuse those old caps, they are a time bomb! new replacements are the way to go if you want to preserve those PCBs from leakage damage.

Vauxfan2k · 10th Mar 2017, 8:51 am

both boards had been replaced at some point, so weren't the same age as the machine. I checked them before and after removing for any damage/leaking and also the values and all 4 are now the same. As it's my own machine and won't be gettting sold combined with the little amount of use the machine gets, they will be perfectly fine. Not like it's a hard job to replace them again if anything happens.

4th Mar 2017, 4:42 pm	#1
Vauxfan2k Hexode Join Date: Aug 2016 Location: Inverness, Highland, UK. Posts: 300	Panasonic NV-FS90/FS100 hybrid board Hi guys, Took this board out my donor fs90 that I had robbed bits from. The original fault was there was no picture on vhs or svhs at all. Suspected this board but never for round tonremoving and checking til now. There's no leaking from the caps and no damage to the ic and tracks like in pics on the other threads. However there is a link wire from pin 10 of the centre connector to pin 1and 2 of the hybrid board. Doesn't look factory and possibly a failed repair? The board has obviously been replaced by looking at the solders, but should pins 1 and 2 be joined and also 9 and 10? Or is it messy soldering? Can anyone shed any light on why this might be like this? I was hoping the board was ok to transplant into another machine. Thanks Attached Thumbnails

4th Mar 2017, 4:48 pm	#2
John123 Heptode Join Date: Jan 2007 Location: Luton, Bedfordshire, UK. Posts: 891	Re: Panasonic nv-fs90/fs100 hybrid board I still wouldn't trust those surface mount caps. They might look good, but given the age of the machine looks can be deceptive. Give the entire thing the once-over with an ESR meter. I think that link wire is factory. If you look in the top-right there's a resistor that looks like an afterthought as well. Probably a later revision of the same board would have these integrated. Not uncommon! __________________ Regards, John

4th Mar 2017, 5:02 pm	#3
Vauxfan2k Hexode Join Date: Aug 2016 Location: Inverness, Highland, UK. Posts: 300	Re: Panasonic NV-FS90/FS100 hybrid board Took a chance and put it in my machine anyways as the one that came out also had the bridge wire. Both vhs and svhs work perfectly. Pic of Leaking caps and damage to smd's on the old board The soldering on the old boards hybrid chip was factory where as the replacement has been replaced at some point and looks good with the meter. Attached Thumbnails

4th Mar 2017, 8:55 pm	#4
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,935	Re: Panasonic NV-FS90/FS100 hybrid board Easy way with any elec caps,is put a soldering iron on the joints and it quickly puts its hand up if duff.An anonymous sizzle. __________________ G8JET BVWS Archivist and Member V.M.A.R.S

5th Mar 2017, 12:23 am	#6
Vauxfan2k Hexode Join Date: Aug 2016 Location: Inverness, Highland, UK. Posts: 300	Re: Panasonic NV-FS90/FS100 hybrid board Have made another working board by combining the good caps from each onto the board with the good tracks. Fiddly job with my iron tip being a bit on the large side but it's working great. Wish I had done this sooner. The anticipation was worse than the job itself.

10th Mar 2017, 12:57 am	#7
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Panasonic NV-FS90/FS100 hybrid board I hope you didn't reuse those old caps, they are a time bomb! new replacements are the way to go if you want to preserve those PCBs from leakage damage. __________________ Regards, Ben.

10th Mar 2017, 8:51 am	#8
Vauxfan2k Hexode Join Date: Aug 2016 Location: Inverness, Highland, UK. Posts: 300	Re: Panasonic NV-FS90/FS100 hybrid board both boards had been replaced at some point, so weren't the same age as the machine. I checked them before and after removing for any damage/leaking and also the values and all 4 are now the same. As it's my own machine and won't be gettting sold combined with the little amount of use the machine gets, they will be perfectly fine. Not like it's a hard job to replace them again if anything happens.