Circuit board glue

[yyonline]

I am working on repairing an Acer AL2223W monitor. I opened it up to find bloated Capxon capacitors on the power supply board, and bloated Teapo on the logic board. So, the first order of business was to replace all the capacitors. However, the lamps still turn off after a few seconds.

It seems like the inverter transformer is at fault here, as it has power to the transformer, but no power after it - so I ordered a new one:
http://www.lcdparts.net/TransformerD...ber=T-8TC00332

Now, the board has a blob of white glue over every one of the solder joints on the high voltage side. I'm assuming that this is for extra insulation. Does anybody know what this stuff is? I'm assuming that it's something digikey or mouser would carry, if I knew what kind of glue it was. It's the same flexible white glue that manufacturers love to smear all over power supply boards. It's not the hard glue that turns brown over time. It would probably work fine without it, but I'd prefer to have the extra insulation if possible.

[multimeter]

Re: Circuit board glue

just use silicone,or decorators caulking,works fine i use it all the time,just make sure it has dried properly before applying power to the monitor

[PCBONEZ]

Re: Circuit board glue

just use silicone,or decorators caulking,works fine i use it all the time,just make sure it has dried properly before applying power to the monitor

Some of those products can be conductive when cured.
If it doesn't mention non-conductive on the label or the manufacturers site then don't use it.
.

[Krankshaft]

Re: Circuit board glue

Use Permatex Ultra Gray RTV from an auto parts store a Panasonic TV I worked on used a similar rubbery gray substance on the main IC contacts presumably for insulation purposes.

The service manual didn't specify what it was so I used RTV never had any pin shorts or damage.

[yyonline]

Re: Circuit board glue

The existing stuff does appear to be very similar in texture to RTV silicone.

Here's two options I came up with:
http://www.mgchemicals.com/products/162.html


It doesn't specifically say non-conductive, but it gives an electrical volume resistance that is (seemingly) very high. However, I am not familiar with the this measurement for this application. I'd welcome any thoughts people may have.

[PlainBill]

Re: Circuit board glue

The existing stuff does appear to be very similar in texture to RTV silicone.

Here's two options I came up with:
http://www.mgchemicals.com/products/162.html


It doesn't specifically say non-conductive, but it gives an electrical volume resistance that is (seemingly) very high. However, I am not familiar with the this measurement for this application. I'd welcome any thoughts people may have.

Either of those will work. I was also going to suggest GE Silicon II clear tub and tile sealant, but have not been able to find an equivalent datasheet.

PlainBill