Acer AL2216W Repair Question

[trains58554]

Re: Acer AL2216W Repair Question

Sorry about that i was thinking that they where on the bottom side. Q102 is p10NK60ZFP and F100 seems to be bad as it does not read anything on the meter.

[trains58554]

Re: Acer AL2216W Repair Question

@jetadm123,

As far as I could tell it was not making a good connection so I re soldered it and now I get an orange flash from the power led on the front when I first power it on. It only lasts for a millisecond or two then when I power it off and back on the orange lite does the same thing.

[retiredcaps]

Re: Acer AL2216W Repair Question

Q102 is p10NK60ZFP and F100 seems to be bad as it does not read anything on the meter.

Desolder F100 and retest to ensure it is a bad fuse. A good fuse should measure less than 1.0 ohms.

For Q102, number the pins 1, 2, and 3. Measure the resistance between pins 1-2, 1-3, and 2-3. Report your results. If you have a manual range multimeter, set it to 200 ohms. If it reads "1" on the left hand side, that indicates the reading is out of range which is fine for our purposes.

[trains58554]

Re: Acer AL2216W Repair Question

for pins 1-2 I got 0.f for pins 1-3 I got 3.88 k ohms and for 2-3 I got 0.f ohms. As for the fuse I checked it again and I got 98 ohms.

[jetadm123]

Re: Acer AL2216W Repair Question

for pins 1-2 I got 0.f for pins 1-3 I got 3.88 k ohms and for 2-3 I got 0.f ohms. As for the fuse I checked it again and I got 98 ohms.

I'm not sure what 0.f means. Maybe out of range? Retiredcaps knows meters much better. F100 looks to be bad. What's F100 connected to anyways?

[trains58554]

Re: Acer AL2216W Repair Question

one side of f100 connects to the middle pin of the Q102 and the other side goes to a resistor. the color code on f100 is black red gold black red so looking at a resistor chart it is a 1 ohm with a +- 2% tolerance.

[jetadm123]

Re: Acer AL2216W Repair Question

Good thing you posted that color code. It's a fusible resistor, which is also used on different models of Delta boards. The other boards use a 100 ohm resistor, which is close to your 98 ohms. The color code you provided is definitely throwing me off.

[jetadm123]

Re: Acer AL2216W Repair Question

You can try reading Q102 again using a 200K or 2Meg setting to see if you can actually get a numerical reading instead of 0.f.

If Q102 does check out good, then at this point, I'm inclined to suggest you replace the TEA1532AT (U105) controller and startup cap.

[trains58554]

Re: Acer AL2216W Repair Question

The color code could be wrong as it is hard to see with all their white glue around it. I will try checking the Q102 again and report back.

Thank you both for your help thus far.

[trains58554]

Re: Acer AL2216W Repair Question

OK here are the results of the test
1-2 324.2 k
1-3 3.88 k
2-3 340 k.

The start up cap is brand new as it came in the kit with the other caps.

[retiredcaps]

Re: Acer AL2216W Repair Question

I'm not sure what 0.f means. Maybe out of range?

I have only seen OF (out of range) on one brand of multimeter and it is a Radio Shack. All others use 0L.

[retiredcaps]

Re: Acer AL2216W Repair Question

OK here are the results of the test
1-2 324.2 k
1-3 3.88 k
2-3 340 k.

The start up cap is brand new as it came in the kit with the other caps.

Your Q102 is good (not shorted). Since it is a new cap, I agree with jetadm123 that your TEA1532 SMPS controller is the next likely culprit. It is available at digikey or mouser.

This is very similar to a case back in Sept 2010.

https://www.badcaps.net/forum/showthread.php?t=11004

[trains58554]

Re: Acer AL2216W Repair Question

Yep you guessed it our multimeter is a radio shack meter.

We will try that next and go from there.

I will look at that other case.

Thank you for your help retiredcaps and jetadm123

[budm]

Re: Acer AL2216W Repair Question

I looked at the PS primary section, it looks like the resistor or something is bad on the board on the left of ZD102.
One thing that does not make sense is that he is getting about 9vdc at pin 1 VCC PIN, since this VCC is generated from the aux winding of the transformer which will keep the SMPS IC running after it gets the kick start voltage on pin8, once it starts, it does not use voltage from pin 8 any more, but it will be using the VCC from the aux winding, so for it to have 9v at pin 1, the aux winding must be putting out the voltage which mean the SMPS is running, unless pin 8 is shorted to pin 1 internally.
I will be waiting to find out the outcome of the problem.

[trains58554]

Re: Acer AL2216W Repair Question

Hi budm,

What you are seeing there is the resistor got scratched I did check that resistor with the multi meter and it tested good yet. I am thinking that this is the same problem as in the other forum topic retiredcaps pointed out a few posts up. I think if we get a new SMPS ic we should be back up and working.

[budm]

Re: Acer AL2216W Repair Question

In the mean time, can you check the continuity between pin 8 and pin1, that may explain why you are getting 9v at pin1 to see if it has shorted or leaking internally.

[trains58554]

Re: Acer AL2216W Repair Question

I will check that in the morning and report back.

[trains58554]

Re: Acer AL2216W Repair Question

Ok I did a continuity test between pins 1 and 8 and it was not shorted. I then powered the board up and tested from the ground tab to pin 8 and I was only getting 36 volts is that normal?

[budm]

Re: Acer AL2216W Repair Question

38V is not right, it should be the same to what you read on the large main DC filter caps. See the app note how the TEA1532 is used.
By the way, what do you mean by " the ground tab"?

[trains58554]

Re: Acer AL2216W Repair Question

When I say ground tab I mean the metal part of the board with the screw hole by the power plug.