Sanyo DP40142 No backlight

[keithdisco]

Re: Sanyo DP40142 No backlight

i know its an old post but i totally agree very bad design i would never buy one of these pos tvs

i found exact same issue as above blown resistor
with burnt connections between led strips
new name is toss-shita

[RAMSELECTRONICS]

Re: Sanyo DP40142 No backlight

Hello all, I think it is new post for now, I am talking about the power supply from DP40142. I checked the voltage the 5V is working fine, I see the 12V and 24V are group and does not give output. I replaced the chip SSC9512S and no luck.

I tested with 2 of MOSFET are fine.

Any one know about this? please help. THANK YOU!

[RAMSELECTRONICS]

Re: Sanyo DP40142 No backlight

Hello all, I think it is new post for now, I am talking about the power supply from DP40142. I checked the voltage the 5V is working fine, I see the 12V and 24V are group and does not give output. I replaced the chip SSC9512S and no luck.

I tested with 2 of MOSFET are fine.

Any one know about this? please help. THANK YOU!

I forgot to add this, the power supply is FSP140-4F01

[Shane711]

Re: Sanyo DP40142 No backlight

I am surprised to see Herbssat's picture of the LED driver board inside the panel. I have never seen a circuit board inside the panel like that before. I have this TV, it seems to be turning on but no back light. I will have to disassemble the screen to see if I have this same problem.

[budm]

Re: Sanyo DP40142 No backlight

https://www.badcaps.net/forum/showpo...4&postcount=18

[Shane711]

Re: Sanyo DP40142 No backlight

Thanks budm, that is a very good picture. I found the LED driver board. This is the first time I have seen it in this location.

Seems my LED driver board is good because I only have 2 LED strips working. Got to leave for a while and when I get back I will remove the bad LEDs and replace them with good ones.

[Shane711]

Re: Sanyo DP40142 No backlight

This Sanyo DP40142 is a piece of junk, man they don't make them like they used to. It looks like I am going to have to replace 80% of all the LEDs, I would say then that they are all bad. Looks like I have no choice but before I do all this work I am going to turn the TV on again with a light behind the screen just to make sure the LCD screen is good. No point doing all this work for nothing.

[Shane711]

Re: Sanyo DP40142 No backlight

Well, good news. The TV is fixed. I had to replace 2 LEDs but I thought I was going to have to replace all of them because 2 strips were bright and the other 3 were very dim. But I put it back together without the screen and the LEDs were very bright. So then I put the TV all back together and it seems to be working good. Time will tell. I have included a picture.

Once again this web site has helped me fix a TV because I thought for sure it was the main board. I best keep reminding myself these LEDs love to burn out.

[budm]

Re: Sanyo DP40142 No backlight

Thanks for the follow-up on the repair.
What LEDs did you use for the repair?
So far to me the TVs with LED backlights seem to have 90% failure due to failed LEDs.

[Shane711]

Re: Sanyo DP40142 No backlight

I have a bunch laying around that I removed from TVs with bad panels. So I had some that looked almost exactly the same. I used my small heat gun work station to remove them. I then touched up the solder on the TV strip and replaced 2 LEDs on the strip next to the LED driver board.

It pays to keep parts laying around. I do my best to keep the parts organized but it's not easy.

[Hartman]

Re: Sanyo DP40142 No backlight

R053 is not 85 ohms but the smd code is 05B which is 1k1 ohm (1100 ohms)
I just repaired my Philips 40pfl3208 which uses the same panel.
In my case no backlight and R053 was 7kohm instead of 1k1
I also saw that the connecors between the ledstrips made very poor contact.
You will have to bypass all of these in order to repair it, so that it is reliable.
The led driver passes its power onto a green strip, that transfer it to the horizontal positioned led strips.
I also bypassed these connectors in order to make it reliable.
Greetings
Jeroen Hartman
Cctv technician
Netherlands

[Shane711]

Re: Sanyo DP40142 No backlight

Same exact TV as in post #47 & #48. The TV again burnt out some LEDs but this time I noticed burnt contacts on the strips and maybe this short was causing the LEDs to burn out. Seems to only happen on this one strip. So I soldered on some jumper wires to bypass the connectors and the TV lives once again. So far no problems with the LED driver board.

[EGM]

Re: Sanyo DP40142 No backlight

Newbie here. I've got a similar problem on a Sanyo DP40142 TV. Backlight driver board SSL400_0D5A REV:1.0 I'm not having any luck on tracking schematics for this TV or board. It has a burnt resistor on R005 and as normal, I cant read the value. Can anyone lend me a hand trying to figure this one out or is there a way I can figure out the resistance? I've tested the leds and the only thing looking bad at this time is that resistor. Something burned it up and I'd like to track it down but need some help.

[EGM]

Re: Sanyo DP40142 No backlight

Shane771 You wouldn't happen to have this BLD board laying around?
Sanyo DP40142 TV. Backlight driver board SSL400_0D5A REV:1.0
If you do, can you tell me the resistor number on R005?
Thanks for your time.

[Shane711]

Re: Sanyo DP40142 No backlight

Yes, I have the board and I will get it open sometime soon because I have to repair the LEDs AGAIN! I will get the number for you. The same TV has burnt out LEDs for the third time. The same TV that I fixed in post #47, #48, & #52.

Does anyone have any ideas on how I can prevent the LEDs from burning out?

[budm]

Re: Sanyo DP40142 No backlight

Did you turn down the Backlights level for all input modes?

[Shane711]

Re: Sanyo DP40142 No backlight

Yep, I did. Could it be power surges?

[budm]

Re: Sanyo DP40142 No backlight

May be checking the LED flowing through the LED string to see what you get. The replacement LED rated at about 400 mA or so?

[Shane711]

Re: Sanyo DP40142 No backlight

budm, I really need to understand this, I just got another TV that was out by the trash, Very nice clean and brand new looking Samsung 46" and so I will start a new thread on that. 50% of the LEDs are burnt out.
If I fix it with the same LEDs then it will only go bad again.

So if I use LEDs with a higher amperage will that mean they will require more power? If they will have the same brightness but could handle higher work loads that would be the thing to do.

And then I will have to figure out where to buy them.

[budm]

Re: Sanyo DP40142 No backlight

Do you have the specification of the replacement you are using?