Re: Hitachi 48C6 lcd artifacts then warm grey

Just installed a new power supply board of the exact replacement model. No sounds coming from the unit. It worked good for about 2 mins but then started to get artifacts and wide vertical bands on screen. Then it fades to warm grey? Any ideas?
I found a main board that's cheap enough but I'm not sure where to troubleshoot to rule out tcon vs main board?

Re: Hitachi 48C6 lcd artifacts then warm grey

That looks like the exact match after closely looking at the connectors. just for curiosity's sake, what do you think could go wrong if I use another board that looks similar but came out of a different model altogether?
[url]https://www.ebay.com/itm/TV-PROSCAN-50-PLDED5068A-E-Power-Supply-Board-303C5502066-1POF248373A/164460133424[/url]
It appears only the 120v connector is different.Re: Hitachi 48C6 lcd artifacts then ...nnectors. just

Re: Hitachi 48C6 lcd artifacts then warm grey

Diodes check out good. I cant find an exact match replacement board on ebay. I see many other boards of the model KB-5150. Is it possible to use a different board, one of the other KB-5150's of a similar size. I'm assuming I would need to adapt the connectors, is this something I should try.

Re: Hitachi 48C6 lcd artifacts then warm grey


One transformer leg appeared to have a cold solder going to a diode. Noise still exists after touching up the solder pad.
It almost sounds like if a very small bit of insulation on the transformer winding has a hole in it and what I hear is a very small arc.
Do faulty diodes make this sound?

I could easily find and order a new/used board on eBay but this is enjoyable troubleshooting and learning....

I don’t see any visible bulging or bad caps on the PS board but there’s a High pitch variable whine noise coming from the transformer on startup.
I’ve replaced caps before on pc and lcd TVs but never delved into troubleshooting much more than checking for visible signs of bad caps.
I read Bud's pdf on general troubleshooting but, has anyone had this audible whine coming from what sounds like the transformer?

Sometimes the TV will show the sources select screen with various artifacts and wide hashed lines on the screen in the background it seems. After...

Re: New Members - please post your introductions here

Hello from sunny Florida, I’ve been tinkering with electronics and building hobby circuits since the early 90’s. I’ve owned and wrote software for a large teleservices company. During the startup phase of the company I tried to be as frugal as possible this included troubleshooting many dead lcd’s and replacing caps etc...
I’m now retired and tinkering full time and soaking up as much knowledge as I can. I enjoy finding the odd lcd at the curb in my neighborhood and bringing it back to life.