sanyo 50" DP50740 IT WONT START, TURNS ON & BIT OF GLOW & THEN GOES OFF

[hmendez86]

I got this 50inch tv dp50740.....it wont start. When i click power on it seem to try to turn on. In the screen show like it wants to glow to show picture and then turns off & on several times.

** i did some research of the ic 1117 regulator migth be the problem but i already did change them. Buy the kit but no luck....
***the problem is the main board i did disconnect the lvds from main to logic board and tv is on but no image of course, so the problem comes from the main board. Any suggestion of what might be doing this problem on the main board.

[martino]

Re: sanyo 50" DP50740 IT WONT START, TURNS ON & BIT OF GLOW & THEN GOES OFF

Very basic but how are the caps on the power supply? I just repaired one of these that kinda did the same thing,turned out it was the caps on the psu,some where not bulged but did read bad on esr meter.

[budm]

Re: sanyo 50" DP50740 IT WONT START, TURNS ON & BIT OF GLOW & THEN GOES OFF

'the problem is the main board i did disconnect the lvds from main to logic board and tv is on but no image of course' You mean the T-CON board? So if the TV stops going on and off (but no pictures due to the T-CON is not connected) without the T-CON, then it looks to me the T-CON is the problem.
You can also try leaving the T-CON connected to the main board but disconnect the ribbon cables between the T-CON and the LCD panel.
Pictures of the whole backside of the TV that shows all the board?

[martino]

Re: sanyo 50" DP50740 IT WONT START, TURNS ON & BIT OF GLOW & THEN GOES OFF

'the problem is the main board i did disconnect the lvds from main to logic board and tv is on but no image of course' You mean the T-CON board? So if the TV stops going on and off (but no pictures due to the T-CON is not connected) without the T-CON, then it looks to me the T-CON is the problem.
You can also try leaving the T-CON connected to the main board but disconnect the ribbon cables between the T-CON and the LCD panel.
Pictures of the whole backside of the TV that shows all the board?

It's a plasma

[budm]

Re: sanyo 50" DP50740 IT WONT START, TURNS ON & BIT OF GLOW & THEN GOES OFF

Ah, thanks for the clarification, I did not search the web to find out if it is LCD or Plasma.
So what logic board that he disconnected from the main board? 'D' BOARD? I do not work on Plasma at all (too heavy for me to lift with my bad backs). I guess in the PLASMA world they use the 'Logic board' which is equivalent to the T-CON board in the LCD TV since it still uses LVD Signals.
http://assets.shopjimmy.com/media/ca...5070ad-top.jpg
http://www.shopjimmy.com/catalogsear...ult/?q=dp50740

I just glance through TOM66 guide:
https://www.badcaps.net/forum/showthread.php?t=18542
So it is also called Control board:
Control board (sometimes called T-con and not to be confused with LCD T-con boards). Often buried under a main board.

[martino]

Re: sanyo 50" DP50740 IT WONT START, TURNS ON & BIT OF GLOW & THEN GOES OFF

Guessing he put it in test mode?

http://www.shopjimmy.com/panasonic-t...ad-d-board.htm

[hmendez86]

Re: sanyo 50" DP50740 IT WONT START, TURNS ON & BIT OF GLOW & THEN GOES OFF

yes its a plasma sanyo

[hmendez86]

Re: sanyo 50" DP50740 IT WONT START, TURNS ON & BIT OF GLOW & THEN GOES OFF

the power supply isnt the problem i already try with other powers supply on working conditions and still doing the same thing....
what i did i disconnect the lvds from the main board and tv start on...obviously no picture because of lvds not connected...so this means main board..

[hmendez86]

Re: sanyo 50" DP50740 IT WONT START, TURNS ON & BIT OF GLOW & THEN GOES OFF

caps when they are not bulge on the top are dry caps from the inside....