My 7025S of three and a Half years, was having trouble powering up from deep Standby or power switch off.
I noticed a steady decline in it's readiness to restart and assumed this was due to a deterioration of power supply smoothing capacitors.
(A job I never got round to sorting before the inevitable total failure).
I took my box apart last week and examined the PSU and indeed one of the 2,200uF DC supply rail smoothers was dry as a bone (Heat evaporation of the electrolyte).
I ordered a complete set of electrolytic capacitors for the output side of the PSU, Having now replaced them all!

Now when I try to switch on power from the box front soft switch, all I get is a momantary 15V and 5V on the HDD supply connector.
This tells me the SMPSU is driving, initially but overcurrent protection is being triggered and killing the switch derived power (Supplementary) supplies.
Only the primary 8V is present constantly, providing 3.3V supply for the Power on Reset Chip and the Atmel Microcontroller forthe display control panel.
With Dream up I noticed on connetion power up the box was recognised but the bootloader would not start.

I ordered a new PSU from my Dreambox supplier, same fault!

I suspect there is short circuit or excessive current draw on the main board causing the psu to overcurrent protect.

I checked all the mainboard fuses: OK!

My biggest worry is that the ATI system cntroller is shot, being the biggest power consumer on the board, I can only confirm this by isolating power to it.
I have measured low resistance both ways across C1224, next to U205 one of the two LP type voltage regulator ic's, but I suspect this is the processor core supply.

If anyone knows where to obtain a full schematic for the box, I'd glady pay to get one asap.

I really do think DMM let this box down with a completely inferior Taiwanese Power supply. (CWT) The German Panasonic replacement I was sent was in every way superior, it must cost at least double the price of the crappy CWT. DMM what were you thinking in a $500+ box?

Any ideas where I can get the main board tested and repaired would also be helpful.

Greatest thanks to all!

Henry.

Please provide some information about the hard- and software used.

[b]Box type: DM7025
[b]GUI (enigma1/enigma2): Enigma 2
[b]Firmware version: Gemini 3.80

[b]your question. What is the make and part number of the LCD panel display.

I have been forced, reluctantly, to replace my display due to Flourescent backlight failure.
I have fitted the OLED kit and I now have a viewable display.

I would like a schematic of the display board and datasheet for the display, as I would like to use it as a display for my home central heating programmer.

Is it a smart display with a pre-programmed (basic) character set library or do you have to generate characters as X-Y or bitmap?

Any answers would be greatly appreciated.

Henry.

Hello my friend,
It's been qiute a long time since I was on this forum.
Has your query been answered yet.

You can easily check if the LNB/ Motor drive voltage is being fed up to the dish.

First you need to ensure from the settings menu that the tuner settings LNB, Diseq 1.2 etc all selected 12V output is on.

If to have a small piece of spare satellite 50 Ohm Coax cable, just bare the inner and remove about one cm of the centre solid copper wire.

Turn off the Dreambox and disconnect it from the power outlet.

remove the satellite cable F connector, if not already done and insert the piece of wire into the centerhole, ensure you leave about 1/2 cm protruding.

Just get a multimeter, set it to volts DC 0-20 range or similar.

Touch the positive (Usually red) from the meter to the protruding wire and attach the black to either the metal screwthread of the Dreambox F connector.

Ensure the center wire is not shorting to the metal surround or any part of the dreambox metal chassis.

When you are happy all is safe carefully connect outlet power and turn on your Box. Allow time to boot up.

You should see the 12V DC supply feed on the Center terminal of the satellite connector.

I have previously had problems with my Diseq motor, requiring resetting of the motor itself. Most have a reset button actually on the motor, but this requires climbing up to the motor and physically operating the switch.

The same can be achieved by turning off the box and disconnecting the satellite feed cable, leaving it disconnected for 5 mins ought to ensure the next time 12 V is applied to the Motor it's control circuit will auto reset.

From what you describe the fault could even be in the Unit's power supply, as that is where the 12V comes from, so don't assume it's the tuner straight away.

If you have another satellite box of any description connect it and check the LNB is working. That will tell you the cabling and LNB are ok.

Best of luck,
Henry.

I have a DM 7025 Box.
a number of things are wrong with it as from new!

1. Nothing works on the USB port, I have six different USB Mem sticks, none of them work.

2. Display is absolutely pathetic, can't read it from 1m away, altering contrast only makes it worse, in anything but the dimmest of light you can't see the backlight. To make matters worse DMM admission by their own actions that the display is awful, told me that a new Firmware version would correct this, I'd like to know how as it's a hardware design fault! By offering the OLED as a mod kit they admit the supplied hardware isn't up to the mark. (Instead of offering free OLED upgrades they want to add insult to injury and charge £80 for the privilege. (Poor Customer service in anyone's books)

3. Power supply is inadequate, it overheats and causes loss of sync type effect on the picture if a HDD is fitted, a known problem I gather.

4. power supply is inadequate, with the HDD fitted my Diseq motor sometimes locked up and had to be manually reset. (The only solution was to remove the HDD so now I can't record).

5. Woeful customer service and technical support, on the occasions I have resorted to referring to DMM for assistance they have not been even close to offering a solution.

6. I reported a situation whereby some channels are not available through the diseq motor path to LNB 1. If however you set up LNB2 to tuner A the channels are viewable. Alternatively you cannot have tuner B as Loopthrough to socket A. Again Im told this is a hardware issue, so where's the free fix DMM?

7. If all this isn't enough why should anyone be even remotely tempted to buy the DM8000? Pay the money and wait for the disappointment!

I don't expect this post to get past the forum police, typical of the lack of interest and genuine regard for customer satisfaction I'd say, I can but live in hope!

Regards,
H