Sanyo DP37647 LCD set

[Findm-Keepm]

Youtube has a few germane videos:

http://www.youtube.com/watch?v=eNuGW...eature=related

I'm trying to remember which of the parts brokers has inverter transformers cheap. If I find it , I'll post it.

The dealers around here all report that electrolytic caps and inverter transformers go bad in these sets - Plasma eats caps - most are the low profile 35V caps.

Cheers,

[Findm-Keepm]

Ok, so they ain't cheap!

http://store.lcdparts.net/Transformer_c_7.html

No affiliation, never heard of them until I DAGS....

Cheers,

[Findm-Keepm]

Found my Acme Sales flyer - looks to be a whole lot cheaper!!

http://www.acme-sales.net/portal.php?country=USA

I have ordered flybacks and Sony kits from them - 2 yrs ago. Fast. Other than that, no affiliation.

Cheers,

[YamahaFreak]

I had a 17-inch LCD monitor that did this to me. Press power button, picture for about a fraction of a second, then nothing. Bright, intense light put to the screen revealed that there was still a picture, only no backlight. I replaced two vented capacitors inside and the display works now. Here's the eHow article I wrote about it: http://www.ehow.com/how_5086953_repa...r-monitor.html

[Findm-Keepm]

Checked with one of my service buddies and he told me you need a 6010B transformer - easily obtained from LCDParts.net. I've never dealt with them, so full disclaimer.

http://www.lcdparts.net/TransformerD...ProductID=2795

My buddy Wayne services all the new stuff - for him, it's capacitors or the obvious, or he's not gonna be able to fix it, so his advice is always taken lightly. Still, he fixes enough to make a living.

Please let us know how this turns out!

Cheers,

[radiotvnut]

Got the ballast in today and installed it. Guess what? It's still doing the same damn thing! Comes on like it's going to work for a second, lights go off, audio remains. I did check the resistance of the new ballast, before and after installation, and it seems OK. I guess I could order a new inverter board; but, there's still no guarantee that will work and I'll really be hot if I spend $100+ for a board + what I already have in the transformer and the stupid POS still isn't working. So, if anyone has any ideas before I give this TV a funeral, I'd appreciate it. I was hoping to be able to fix this and make some $ off of it; but, it looks like that isn't going to happen. Given these experiences I've having with this modern junk, there will never be a flat panel TV purchased with my money. I'll either keep these old sets that I can fix without blowing a gasket or I'll do without.

[crtfool]

There are too many micro surface mount parts that make the board impractical to repair. Here is a link for a very reasonably priced inverter on eBay - I am not affiliated with this auction or seller.

http://cgi.ebay.com/BACK-LIGHT-INVER...efaultDomain_0

[jr_tech]

I have never seen the insides of one of these LCD sets, but always have thought that if the backlight on my Sony failed, for grins, I would try to rig up a "Rube Goldberg" fix with perhaps several hundred common "white" LEDs and a diffuser replacing the fluorescent tube. I would power the LEDs with a robust DC power supply, not an inverter circuit. Would this be possible?
jr

[crtfool]

jr - It is possible, but probably not practical - other than the fun and challenge of doing it.

CCFL backlit LCD TV sets have several tubes behind the LCD to illuminate the panel. LCD monitors are edgelit with several CCFL tubes attached to the sides of the panel.

[freakaftr8]

I'll bet thats it. Inverter boards are finicky. Check those flat transformers for shorts. If I had a flyback and yoke ringer that might do something. And of course bulging leaky lytics.

Originally Posted by radiotvnut

I can hold a flashlight over this one while in a dark room and see a picture as well.

I did speak to the owner and he decided just to buy a new TV rather than risk buying a board for this one and there possibly being more wrong with it or having something else go wrong in the near future. I used to never advise people to do this; but, I told him to consider buying the extended warranty with the new TV. That way, he has a little more protection should the new TV fail within the first few years.

I'll probably order the board to fix this set since I could probably unload it a lot quicker than I could a CRT set.

[radiotvnut]

Here are the voltages that I measured on the inverter board:

VDD - 23.3
VDIM - 3.2
BLON - 3
PDIM - 5.6
PDIM-SEL - 4.1