bad tuner (conexant chip)?

[aerohead]

Has anyone ever had a tuner chip go on them? I have 2 301.013's
One of which is working perfectly while the other will not pick up any signal whatsoever. I am using the same cable from the dish and doing a check switch on both units. I have reflashed the problem receiver with original tsop and eeprom with the same result, no signal. It had a problem before the Nagra2 switch over where I had to do a hard reset to get a signal. Now that doesn't work anymore. Any ideas would be appreciated.

[BirdieMod]

Use a dc voltmater and check on the sat in connector for 13-19 volts dc with the sat cable unhooked while the receiver is in the signal meter screen, Start on transponder 1 and meter the voltage then set it to transponder 2, Should have 13-14 one way and 18-19 the other. If not you have a lnb power problem which can be fixed.
Second, Virginize the eeprom making sure it matches the tsop build you have loaded on it.
The max chip bad usually has signal at first while the ird is still cold and signal fades out after about 5-15 minutes of running typically at least.
Other signal problems: Too old firmware sometimes or using a blacklisted ird number.

[AdolfHitler]

I've got a similar problem except that my 301.13 will register a signal on the screen just before check switch, however, the check switch itself will fail, though the IRD recognizes that I have a DP-Twin installed.
If I find a viable solution I'll let you know.

[skinerd]

I've got a similar problem except that my 301.13 will register a signal on the screen just before check switch, however, the check switch itself will fail, though the IRD recognizes that I have a DP-Twin installed.
If I find a viable solution I'll let you know.

A bad flash willl cause that too.......the flash has the instructions for running the LNB and or installed switch.....

[BirdieMod]

check the same things

[aerohead]

Have any of you guys ever heard of the heat gun trick? Whereby you funnel a heat gun down as small as possible and direct it at the conexant chip until the solder just starts to flow. This sounds dangerous to me.

[skinerd]

Have any of you guys ever heard of the heat gun trick? Whereby you funnel a heat gun down as small as possible and direct it at the conexant chip until the solder just starts to flow. This sounds dangerous to me.
That was a fix for a -010 with a different chip, I have used a similiar method, but with a -010 and my electric stove. I positioned the corner of the board over a small burner, sitting it on 3 cups, turned burner on and let it get the board get hot, from underneath, enough I could touch solder to a ground point and have it melt. Turn burner off and carefully move board away from it and allowed it to cool.....it actually worked, fixed the -010. It must have been loose from the ground plane, heat won't fix a bad chip.
It is very hard to tell when it's hot enough and not too hot, same with a heat gun, my heat gun will reach 1100 degress F, and literally smoke a board. It moves a lot of air too, that's why I elected to try the electric stove.

[BirdieMod]

Heat gun trick worked on one for me out of about 20. You need to cover the main part of the chip though and only heat the pins themselves or if the chip is heated too much it is toast.
Bad solder on this usually the ird works cold and losses signal after 5-15 minutes and pressing on the chip them restores signal.

[aerohead]

Appreciate the help guys. I'm gonna try pressing on the chip first to see if I can get any signal at all. What do you cover the chip with when heating it?

[hoser]

I have a similar problem with a 2700 (no sat signal) I checked the sat in connector with the sat cable out and I am getting a reading of 12.80 on the odd transponders and 18.69 on the even......they are not fluctuating at all.....I remember when doing dave's 420's, they were jumping from 13 to 18 consistently but these readings are just staying and not moving up or down at all.

THis ird was working at one time and just suddenly stopped looking for sat signal.

If I should make a new thread, let me know and I will.

Also, this ird seems to have some work done to it.......There are three wires going from inside the sat in box from the resistors above the 4.00pdi crystal to the outside soldered to R90, R91 and R92 resistors.......Maybe one of you can know what this is for?........

Thanks in advance for your help.

hoser

[aerohead]

Just to follow up how I fixed my problem. After screwing with this stubborn b**** for weeks. It wasn't the conexant chip at all. All I did was put my soldering iron on the solder spot right behind the sat in connection until the solder started to flow and presto it was like brand new! Thanks guys hope this helps one of you in the future. Such a simple fix and yet so frustrating. I looked at that spot several times during the couse of my hair pulling but it looked good and just never put my iron to it.