Riddled TV Repair Forum

Clodbuster · Joined: 12 Nov 2008 Posts: 11

Need help with my set.........

Sony 27" TV
Model KV-27S15

It's completely dead. No blinking lights or sounds. Power button on the front does nothing.
I was watching it one morning and all the sudden it just went off. Just like you turned it off with the remote.
I want to know if this is something I can repair myself. I already opened the back to check for any fuses or burnt looking components..... nothing that I could see. I can remove and solder components but have no direct knowledge about TV components. I feel I can do the repair with some instruction as long as it doesnÃ¢â‚¬â„¢t require special tools or test equipment.

I found a site that sells a dead kit for my set (IÃ¢â‚¬â„¢m sure some of you guys know what IÃ¢â‚¬â„¢m talking about) but, IÃ¢â‚¬â„¢m not sure thatÃ¢â‚¬â„¢s what I need.

Here is some info I found inside the set not sure if itÃ¢â‚¬â„¢s helpful info or not....
SCC-F84M-A
SRB Sony 7131999

Thanks in advance for any help.

Google

kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

The power supply kit typically fixes the problem with this model. Here is what it contains:

a 2SC4927, 2 each 2SC4834, and the 0.1 ohm Micron
resistor, they do have high quality kits of these. but you can order the parts from mouser or digikey just as well.

Clodbuster · Joined: 12 Nov 2008 Posts: 11

Thank you very much for the response. As I stated in my post I donÃ¢â‚¬â„¢t have specific knowledge of the components, so can you or someone help me locate and identify these parts. IÃ¢â‚¬â„¢m sure I could order and replace them if I knew which ones they were.

Or, should I just order the kit that should have the parts I need as well as instructions? What do you think?

The kit is $35.20 to my door and IÃ¢â‚¬â„¢m guess the parts from Mouser would be around $15.00. I didnÃ¢â‚¬â„¢t have enough info on the 0.1 resistor for them to help me so, not sure the cost on that, IÃ¢â‚¬â„¢m guessing really cheap.

AFWIW, no matter which way I go I'll do my best to share this process (success or failure) with the forum in an attempt to help others that may read this in the future.

Again, Thanks a lot for any help.

kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

find out what all is included in the kit.

Clodbuster · Joined: 12 Nov 2008 Posts: 11

They donÃ¢â‚¬â„¢t disclose whatÃ¢â‚¬â„¢s in the kit. They work with you via email and the answer to what is in the kit is....Ã¢â‚¬ÂOur kits contain all the parts necessary for the standard repair of your problem.Ã¢â‚¬Â
As it explains on their site, their experience has a certain value, and thatÃ¢â‚¬â„¢s why they donÃ¢â‚¬â„¢t tell you exactly whatÃ¢â‚¬â„¢s in the kit. I can respect that.... I guess I was a little uncomfortable ordering the kit not knowing if it would fix the set and so I kept looking for answers and came across this forum.

I could tell you where IÃ¢â‚¬â„¢m looking but I didnÃ¢â‚¬â„¢t want to offend anyone or wasnÃ¢â‚¬â„¢t sure if posting their website would break any forum rules, although I donÃ¢â‚¬â„¢t remember reading anything about it being against the rules. And I certainly didnÃ¢â‚¬â„¢t want it to look like I was promoting or bashing that particular site in any way.

Google

kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

sounds suspicious to me.

if this kit is from fix-yur-own-tv.com, you should know that while I have never dealt with them personally, it's not unusual to have their former customers show up here complaining and completely dissatisfied. From what I can tell, once they get your cash, they're no longer interested in helping you.

Because of that, I usually delete any direct referrals posted on this site.
here is one such instance

Clodbuster · Joined: 12 Nov 2008 Posts: 11

That is the place. So, I guess now I just need to wait and see if someone here can help me with the specific parts to order and locate them on the set.

kuhurdler, thank you very much for your help thus far.

These are the Mouser part numbers that were cross reference matches for the part numbers you provided:
526-NTE2636 (1ea.2SC4927)
526-NTE2582 (2ea. 2SC4834)
And as I said earlier I wasnÃ¢â‚¬â„¢t able to figure out the 0.1 ohm Micron resistor.
If anyone has a chance to find the specific Mouser part number for the resistor and/or verify that I have the other part numbers correct please let me know.

I will check back here often to see if someone has information. If there is any info or pictures that I could provide that would be helpful please let me know.

Thanks![/url]

kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

found this:

http://www.electronix.com/catalog/product_info.php/cPath/16_213/products_id/6556 FYI, I have never ordered from these guys.

Also find one here: http://www.acme-sales.net/portal.php?product=!&country=USA (copy and paste that)
click sony kits on the left frame. (I have ordered from there)

If you supply me with pictures of the board, I will point out the components you need to replace.

also found this info on why your fault typically happens:

Here is the normal chain of events:
1) Bad solder connection (usually the driver transformer secondary) causes increased resistance in the HOT base drive circuit which prevents the transistor from being fully on during conduction.

2) HOTransistor begins to heat up eventually leading to a short.

3) Power supply is overloaded and the two chopper transistors fail shorted.

4) The fusible resistor opens and the set is dead.

If the original bad connection is not repaired, repeat steps 1 through 4.

Clodbuster · Joined: 12 Nov 2008 Posts: 11

Wow.... You are a credit to this forum and anyone who believes in the Ã¢â‚¬Å“Each one, teach oneÃ¢â‚¬Â moto.
OK, IÃ¢â‚¬â„¢m guessing you know this will be baby steps for me. I completely understand doing this in this format could take a few days or whatever and thatÃ¢â‚¬â„¢s just fine, IÃ¢â‚¬â„¢m just glad you are so willing to help.

I didnÃ¢â‚¬â„¢t want to assume anything so I did take much apart yet. Here are some pics to help us get started. Just let me know what needs to come apart and I will get it done and if I canÃ¢â‚¬â„¢t figure it out IÃ¢â‚¬â„¢ll come back and ask and wait for your reply.

Let me know if you more specific pictures.

Right and Left is looking at set from the back.

Right Side

Left Side

Direct from the back

Another Left Side w/assembly pulled back a little

Front of the assembly

kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

I think these are the 3 locations you replace the transistors:

confirm that the numbers on the old chips match the ones on the new chips.

I cant remember the resistor location, its somewhere close to those two transistors that are on the same heatsink.
Make sure you resolder all the solder connections for that transformer with the yellow plastic around it.