NonWorking Samsung LN40C630?

[KenOlson]

Hi

Recently inherited a nonworking Samsung LN40C630 with no signs of external damage to either the screen or front and back body.

While this is the first LCD I have worked on, have been taught to check for burnt and broken components and PC boards, and count flashes and beeps when turn unit on/off.

To date I have only plugged the set in and turned it on and off with these results.

When plug in the AC cord the set makes a short musical sound(MS) and the power light(PL) flashes 6x then off.

When turn the set on get shorter (MS) and (PL) stays on but there is no screen light.

When turn the set off get shorter (MS) and (PL) flashes 5x then off.

Searched the forum and found Samsung LN40C630 "No Signs of Life"
https://www.badcaps.net/forum/showth...light=LN40C630
and Samsung LN40C630 won't turn on
https://www.badcaps.net/forum/showth...light=LN40C630

Neither posts mention musical sounds and flashing power light so I hope my problem is less serious!

Appreciate any tips/suggestions concerning dismantling the set to be able to check the fuses and other components.

Googled using "Samsung LN40C630" problems and found "Samsung LN40C630 Backlight Problem" http://www.avsforum.com/forum/166-lc...t-problem.html

From same search:
"Bulged Capacitor Problem, Tv Does Not Turn On Anymore"
http://www.helpowl.com/q/Samsung/LNT...anymore/107201

"Replacing Bad Capacitors"
http://www.helpowl.com/q/Samsung/LN4...acitors/211072

Seems like some Samsung LCDs may have Bad Caps!

Hoped to find a database listing most frequent problems for the LN40C630 but have not found it yet.

Am interested in any problems others have found for these sets.

Thanks

Ken

[selldoor]

Re: NonWorking Samsung LN40C630?

https://www.badcaps.net/forum/showthread.php?t=39740

[KenOlson]

Re: NonWorking Samsung LN40C630?

Hi selldoor,

Thanks for the photo tip!

After opening the back checked the 2 fuses and the front and back sides of the Power Board (PB) and Main Board (MB).

The 2 fuses were OK and I did not notice any burned/broken components or traces on either board. Upper left of MB noticed Switch SW701.

Then removed the MB connector and plugged the AC cord in and the LCD back light came on.

Pushed SW701, reconnected MB and when connected AC cord got 5 power LED flashes and short music, touched power and LED came on and stayed on (no flashes) but no screen came up and the Input Mode and Menu did not work.After ~ 1 minute touched power and got 5 flashes and short music and set turned off. Also got same results with a DVD player connected to AV2.

Wonder if these flashes are same as PC BIOS "No Boot" beeps?

Appreciate any comments!

Thanks

Ken

[mmartell]

Re: NonWorking Samsung LN40C630?

On Samsung tv's the flashes mean nothing. Do you get audio when you cycle through the inputs with the dvd player connected ?

[budm]

Re: NonWorking Samsung LN40C630?

At this point it is the main board problem (the backlights come on when cable between main and power supply is disconnected which means the power supply is OK).
I never have luck fixing Samsung main board. You can contact shopjimmy to see if they have any suggestion.
You can also report the DC voltage readings on each pin of the connector CN802, just to see what you have.

[KenOlson]

Re: NonWorking Samsung LN40C630?

Hi mmartell,

"Do you get audio when you cycle through the inputs with the dvd player connected?"

Never tried because nothing came up.

Did not receive the dedicated Samsung LN40C630 have only the controls on the set to use.

Any suggestions how to check the audio?

Thanks

Ken

[KenOlson]

Re: NonWorking Samsung LN40C630?

Hi budm,

"...You can contact shopjimmy to see if they have any suggestion."

Am new do not know what you mean but if give me detailed instructions will try.

Thanks

Ken

[tom66]

Re: NonWorking Samsung LN40C630?

ShopJimmy is a parts retailer, mainly selling TV parts. http://www.shopjimmy.com