Acer AL1916W, can't find the problem

[Phoenix83]

Re: Acer AL1916W, can't find the problem

R210=10,3ohm

How can I try to start it up with a resistor? And the battery for a what needed?

[selldoor]

Re: Acer AL1916W, can't find the problem

Yes I was suggesting testing the lamps but if you cannot use another monitor to test them and dont have spare bulbs then I or Davi will instruct you on how to try to jump start the power supply with a resistor.
First though can you look on the back of the board for R210 - in your picture it is
to the right of the 14 legged IC in the top left corner. Is it marked 10R0 and can you test it - just on the board for now.

[Davi.p]

Re: Acer AL1916W, can't find the problem

I think he suggested a lamp testing but if you have not tested the onscreen lamps for now is unuseful, the second part he repeat what i've said earlier about the ps board power on forcing with 1k resis. (aahh.. aaahh.. oxigen!..)

[Phoenix83]

Re: Acer AL1916W, can't find the problem

ok I must have misunderstood something earlier when I said its no good testing lamps as you have no voltages. I have read through and you do have 5v and 13v so do you have any bulbs in anything you can use test are anything you can test these ones in.
If not, do you have a 3v battery or a 500 ohm or 1k resistor perhaps you can force start the power supply with the main board disconnected - that will bring lamps on hopefully.

I don't understand this so much ...

[Davi.p]

Re: Acer AL1916W, can't find the problem

so the EVA you wrote is the on-off, do the test discussed earlier..
if the lamp doesn't light up place a 1k resis. also to BL_adj and 5v

[Phoenix83]

Re: Acer AL1916W, can't find the problem

Find this in service manual:
CN5 input connector:

Pin no........symbol........desc.
1..............AOL+..........audio
2..............AOL-..........audio
3..............AOR+..........audio
4..............AOR-..........audio
5..............Shutdown....audio
6..............Mute...........audio
7..............Vol_adj........audio
8..............+13,8V........+13,8V
9, 10.........+5V............+5V
11............Aud_DET......audio
12, 13, 14..GND............GND
15............ON/OFF........Enable (on): 3,3V; Disable (OFF): 0V
16............BL_Adj.........Dimming control (PWM=260Hz Vpp-p=3,3V)

Hope it helps

[Davi.p]

Re: Acer AL1916W, can't find the problem

i don't understand labels , are uncommon, last 6 left/right are for audio, remains adj, eva, adam.. ehm sorry.. det, v_adj, but those adj seems "adjust" so a variable signal like the brightness, i think EVA is not EVA but ENA=enable=bl_on, whatch better.

[Phoenix83]

Re: Acer AL1916W, can't find the problem

Here's pinouts

ADJ EVA
GND GND
GND DET
+5V +5V
+13,8V V_adj
MUTE SHUT
ADR- ADR+
ADL1 ADL+

[Davi.p]

Re: Acer AL1916W, can't find the problem

ok you have the pin labels near output connector but its on the shadow in your pic. so locate by yourself the blon pin and do what i've said previously, if you have doubts post here the pinout, please don't post picture, baadcaps.net's harddisk is not big from there to the ionosphere

[Phoenix83]

Re: Acer AL1916W, can't find the problem

Yes have batteries, 500ohm, and 1k resistors.

[Davi.p]

Re: Acer AL1916W, can't find the problem

the inverter must be switched on with the command from main board or from a connection between 5v and bl_on signal through a 1k resistor but don't use cfl lamps like budm , use its own first, that can be good..

[selldoor]

Re: Acer AL1916W, can't find the problem

OK do you have a 3v battery( CR2032) or 2x 1.5v batteries or a 500 ohm or 1k resistor

[Phoenix83]

Re: Acer AL1916W, can't find the problem

I try to connect 4 bulbs like BUDM wrote in here: https://www.badcaps.net/forum/showthread.php?t=19987, they don't light up.
So the inverter don'd work, think.

[selldoor]

Re: Acer AL1916W, can't find the problem

ok I must have misunderstood something earlier when I said its no good testing lamps as you have no voltages. I have read through and you do have 5v and 13v so do you have any bulbs in anything you can use test are anything you can test these ones in.
If not, do you have a 3v battery or a 500 ohm or 1k resistor perhaps you can force start the power supply with the main board disconnected - that will bring lamps on hopefully.

[Phoenix83]

Re: Acer AL1916W, can't find the problem

The solderings are fine, like Davi.p wrote, is only reflections. I do not have an oscilloscope. I'm biding one USB osc. on Ebay.

[Davi.p]

Re: Acer AL1916W, can't find the problem

I don't think that those solder joints are bad, it's only a fact of reflections, after those compo. soldered have no influence in monitor functioning, are for filtering noise that psu produces versus mains (electrical net)...

[selldoor]

Re: Acer AL1916W, can't find the problem

Hi

Here's the list of changed caps
CE101 - 220uF/35 V
CE102 - 1000uF/16 V
CE103 - 1000uF/35 V
CE104 - 1000uF/35 V
CE105 - 2200uF/16 V
CE107 - 47uF/63 V
CE108 - 22uF/50 V
C204 - 220uF-35 V

All I can find so far is that they all appear to be in the right way round
and that CE107 is meant to be 47uf - will continue tomorrow.

Looking at the back of the board some of the soldering is really bad - I was going to try and find a picture of someone elses board but have not had time.

Please check carefully and resolder as required the red one doesnt look to have any solder on at all!! That may be right but cant tell what is on the other side?

[Davi.p]

Re: Acer AL1916W, can't find the problem

Regulators are surely good, at this point i don't know which steps you can do, if you have an oscilloscope you can test if the quarz osc. is working, if you don't you can try and replace it, but changing blind-like is not funny, last chance is to search for a replacement main/scaler bd or a replacement RTD2120S that i don't have searched but i guess is a mcu, you need one programmed for this monitor model.

[Phoenix83]

Re: Acer AL1916W, can't find the problem

R105 = 0,5 ohm
I'm unable to find it too. But I think is something like LM117MPX-3.3.
Here's voltages on that regulators. (pic)

[Davi.p]

Re: Acer AL1916W, can't find the problem

R105 smd near output connector must be tested, anyway if is ok your problem seems to be on main/scaler board. I'm not able to find datasheet for ABF646 so you must post all 3 pins voltages.
anyway them has no resistors near so must be fixed output..