Grundig 49 VLE 420 BN - no picture

[betmen]

I bought this used TV as defective, it does not show any picture or menu screen.
When it is turned on, there is no picture, but the backlight works.
The motherboard is ZG7190R-9 and it is probably defective.
Through ads I can buy a cheap TV Grundig tv 43 gua 7000 Barcelona with a broken screen. How can I find out which motherboard is in that TV because if it doesn't match I wouldn't buy it.
Stickers from both TVs are attached.

[thommyX]

Re: Grundig 49 VLE 420 BN - no picture

49Vle is a G5 chassis with ZG7190R chassis and NX with ZG2190R chassis. These are not compatible. You have to have a mainboard from a G5 or G7 device. But it has to be 49 inches and the same panel has to be inside. Best only G5. Then pay attention to the white sticker on the CI shaft. There are letters or numbers there. The first three have to be identical, otherwise the mainboard does not match the panel and there is no picture. You can't change panel data.
Greetings Thomas

[lotas]

Re: Grundig 49 VLE 420 BN - no picture

If there is no image, the problem may not be in the motherboard, but in the T-CON, in
panel slats or in the panel itself.

[betmen]

Re: Grundig 49 VLE 420 BN - no picture

49Vle is a G5 chassis with ZG7190R chassis and NX with ZG2190R chassis. These are not compatible. You have to have a mainboard from a G5 or G7 device. But it has to be 49 inches and the same panel has to be inside. Best only G5. Then pay attention to the white sticker on the CI shaft. There are letters or numbers there. The first three have to be identical, otherwise the mainboard does not match the panel and there is no picture. You can't change panel data.
Greetings Thomas

Thanks for the information.
Can you tell me where can I find information which motherboard is in which TV set?

[betmen]

Re: Grundig 49 VLE 420 BN - no picture

If there is no image, the problem may not be in the motherboard, but in the T-CON, in
panel slats or in the panel itself.

There in no separate T-CON board in this TV.

[lotas]

Re: Grundig 49 VLE 420 BN - no picture

T-CON can be built into the motherboard itself, it can be a separate module, or it can be soldered onto the strips of the panel itself.

[betmen]

Re: Grundig 49 VLE 420 BN - no picture

I think it is in motherboard thats why I think motherboard is the problem.

[lotas]

Re: Grundig 49 VLE 420 BN - no picture

Without a photo, I can't tell you where your t-con is.

[betmen]

Re: Grundig 49 VLE 420 BN - no picture

Here are the photos.

[lotas]

Re: Grundig 49 VLE 420 BN - no picture

This is the T-CON, soldered on the matrix bar, check the fuse and it should have DC + 12V relative to ground.

[betmen]

Re: Grundig 49 VLE 420 BN - no picture

There is 11,88 V before and after the fuse (so the fuse is ok) and there is 3,21V on the test point VCC 3,3V. (left corner on the picture).
Also, there are folloving voltages on the CN3 on the power board, when the tv is on and backlight is working, PINS 1-14:
1 5,13V
2. 0V
3. 11,92V
4. 11,92V
5. 11,92V
6. 0V
7. 0V
8. 0V
9. 24V
10. 3,22V
11. 0V
12. 0V
13. 0,62V
14. 3,13V

[nomoresonys]

Re: Grundig 49 VLE 420 BN - no picture

need to label the pins, example: Pin #
1 FAIL COUNT 0
2 ANA-DIM 0
3 A13V 9.67
4 OD ON/OFF 0
5 A13V 9.67
6 BLU_PWM 0
7 A13V 9.67
8 POWER_ON/OFF .103
9 A13V 9.67
10 GND 0
11 GND 0
12 GND 0

[betmen]

Re: Grundig 49 VLE 420 BN - no picture

need to label the pins, example: Pin #
1 FAIL COUNT 0
2 ANA-DIM 0
3 A13V 9.67
4 OD ON/OFF 0
5 A13V 9.67
6 BLU_PWM 0
7 A13V 9.67
8 POWER_ON/OFF .103
9 A13V 9.67
10 GND 0
11 GND 0
12 GND 0

Pin labeal is on this picture:

[nomoresonys]

Re: Grundig 49 VLE 420 BN - no picture

it's hard to see, what is 11 and 12?

[nomoresonys]

Re: Grundig 49 VLE 420 BN - no picture

do further testing on tcon, test the little capacitors for shorts or very low ohms.

[betmen]

Re: Grundig 49 VLE 420 BN - no picture

it's hard to see, what is 11 and 12?

11 - dim0
12 - dim1
13 - dim2
14 - bl

[nomoresonys]

Re: Grundig 49 VLE 420 BN - no picture

unhook tcon from mainboard and do those tests on the caps.

[betmen]

Re: Grundig 49 VLE 420 BN - no picture

unhook tcon from mainboard and do those tests on the caps.

I do`t think prooblem is on the T-CON, because it have voltages, I think problem is the motherboard.
I already thought to take out the t-con, but for that I have to disassemble everything, remove both plates and the tin cover to get to the t-con.
I will do it when I will have some time.

[nomoresonys]

Re: Grundig 49 VLE 420 BN - no picture

from the picture there, you have all the access you need, no need to remove it to test the caps, pretty simple basic test.

[betmen]

Re: Grundig 49 VLE 420 BN - no picture

from the picture there, you have all the access you need, no need to remove it to test the caps, pretty simple basic test.

I have already tested the ones that are visible, but only a small part of the entire screen panel is accessible through the opening that is visible