-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
|
|
How to Repair a Sanyo AVM-2758G TV
With a Bad Tuner
| |
Click Here
|
First, get a desoldering Iron tool, like the one
shown here
I call it a "solder sucker"
(approx $11 at radio shack)
It heats up like a soldering iron, and you press your thumb on the red bulb.
press the tip down on a solder joint and release your thumb
|
Click Here
|
Circuit Board with the tuner clearly labeled.
|
Click Here
|
The solder sucker removing the tuner
(Don't forget to remove the 4 ground connections at the corners)
|
Click Here
|
The tuner (part # 1AV4F1BAM0190) removed from the board
I ordered a rebuilt tuner from
tiptoptuner.com
They sell every kind of tuner for $27 (and you send them your bad tuner)
|
Click Here
|
Solder the new tuner in using any pencil type soldering iron with a fine tip.
|
Re-install the circuit board, and test it.
Then screw everything back together in reverse order of how it was removed.
Want to see more of this TV?
Click Here
|
Click Here
|
As luck would have it, the tuner on this TV was not actually bad.
The faulty component was a resistor (R106) that was out of
tolerance. I found this info on
this website.
R106 is a (27k 1/4 Watt) resistor near
the voltage regulator. This Resistor directly feeds the
tuner's 33V supply. I jumped the gun on buying a new tuner.
(Always check that the tuner is getting power)
|
I assumed the tuner was bad on this TV because the
"Line Inputs" were working, but anything using the
tuner looked like it was scrambled.
Here is what I should have done:
1. Check the Line Inputs to see if the picture is still scrambled (I checked)
2. Test the voltage to the tuner if it has power (didn't check)
3. Test the "data" pin on the tuner while pushing the Chan + button (it should pulse)
4. If 1 through 3 check OK, then swap out the tuner.
|
|
|
Need Help
? or
Have a Question
about This Repair?
Ask a Question in the
RiddledTV Forums
This website is for information purposes only. RiddledTV.com
and its affiliates are not responsible for damage to your equipment, ego, blown parts, county wide power outages, planetary disruptions, or personal
injury that may result from the information provided here.
|
|
