gt media v8 finder 2 missing 14/18 volts

[mitko 20050]

Hello,
Please help.
My gt media v8 finder 2 - black lost 14/18 volts, no speaker sound and DVB S2 won't lock. Only DVB S works.

[Cluster.One]

Hi,

1) There is no need to uncover tuner to measure LNB voltages, they could also be measured from outside by inserting a 0.5/1 mm rigid copper wire inside the center of the F connector.

2) DVB-S also works with 14-18V voltages, so it seems impossible to me that DVB-S works and DVB-S2 doesn't.

If what you write is really like this, it would seem more like a firmware/software problem than a hardware problem.

If 14-18V is missing due hardware failure or a defective component, finder should not work anyway, or if it works only in DVB-S, LNB is powered by another source.

[CAJE]

The regulator supplies voltage if there is load

[Cluster.One]

LNB voltage is present even in the absence of load/absence of LNB, I just checked/measured on my Finder 2 (green/blue edition)

If necessary I can provide photographic evidence.

[mitko 20050]

The regulator supplies voltage if there is load

Thank you guys but the problem remains, I tried with a load but the voltage stays around 7 volts, I also tried several versions of the software with a forced restore, it didn't help.

[Cluster.One]

The regulator supplies voltage if there is load

Thank you guys but the problem remains, I tried with a load but the voltage stays around 7 volts, I also tried several versions of the software with a forced restore, it didn't help.

Sorry but I can't help you more, it seems that your finder is broken at the hardware level but in this case I still don't believe that it works in DVB-S and it doesn't work in DVB-S2 as you wrote, it seems impossible to me.

You should contact whoever sold it to you for a refund or repair under warranty, but I know that in these cases it is very difficult to obtain something especially for shipping costs.

I only buy low-priced things from China hoping that they won't cause problems in the future, because if they break down it's a waste of money.

[CAJE]

That voltage deviation if you use DTT may be normal

[Cluster.One]

That voltage deviation if you use DTT may be normal

Sorry, what does this have to do with anything? Since GT Media Finder 2 is only DVB-S DVB-S2 not DVB-T...

[mitko 20050]

I assume that I have a fault in the circuit of the DC/DC convertor for 14/18 volts. Can anyone help with a schematic, photo or measurement guide?

[CAJE]

Check the S8035BE regulator
Pin 1 its value is 12 V
Pin 2 is the output

[mitko 20050]

The advice was very good, but it turns out that there is no such chip on the board. The one with 14 pin has no marking so I can check it too.

[CAJE]

The advice was very good, but it turns out that there is no such chip on the board. The one with 14 pin has no marking so I can check it too.

You have it above the tuner

[mitko 20050]

They are above the tuner
AiP9971- 5W mono without FM interference, class AB / D audio power amplifier
104HIP - Serial Flash Memory

[mitko 20050]

Hello,
I have a solution to the problem, I found the DC-DC regulator. Measurements show the same input and output voltage of 7.4v.
the regulator is S35B /STI3508/
Analogous - MT3608, SX1308, SDB628

[mitko 20050]

Screenshot_20240820_115433.jpg