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Acer 1716B no picture, Blinking power light

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    #21
    Re: Acer 1716B no picture, Blinking power light

    Hello! Your power supply looks very similar to the one used for a dell E177FPc. If that's the case, then the W2156 is a FMW-2156 made by Sanken. Spec sheet below.
    Attached Files

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      #22
      Re: Acer 1716B no picture, Blinking power light

      Originally posted by retiredcaps View Post
      I can't find a spec sheet for W2156, so let's assume they are good. If your monitor doesn't work after changing out those shorted transistors, we can relook at these dual diodes.
      Sounds good. I will get the shorted Transistors and replace the caps. Question on the Caps though. Im replacing them with Panazonic FM ones but I can't find replacement ones for the lower UF Caps The FM series(from Digi=Key doesn't have any) what other series is Low ESR that might. I didn't have any luck finding lower ESR(not labled for the other series) Maybe the EB series?

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        #23
        Re: Acer 1716B no picture, Blinking power light

        Originally posted by nico95 View Post
        Sounds good. I will get the shorted Transistors and replace the caps. Question on the Caps though. Im replacing them with Panazonic FM ones but I can't find replacement ones for the lower UF Caps The FM series(from Digi=Key doesn't have any) what other series is Low ESR that might. I didn't have any luck finding lower ESR(not labled for the other series) Maybe the EB series?
        Try the panasonic FC series (also at digikey). They will work and should cover the lower uf values you're looking for.
        Last edited by jetadm123; 08-17-2010, 07:29 AM.

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          #24
          Re: Acer 1716B no picture, Blinking power light

          You can also use KY, KZE, LXY, and, LXZ from United Chemicon. PW and HE from Nichicon are yet another option.

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            #25
            Re: Acer 1716B no picture, Blinking power light

            Thanks for he Advise on other Caps Brands/Series I can get for replacement. THat was very helpful. I finally got my list of Caps to order but I noticed on the board where the 2 bad Transistors are another Transitor Q203
            right next to the Coil. The board looked a littl brown under that too, I thought I would test in circuit. Looks ok(from what I have learned) about 800 or so ohms testing 1-2, 1-3 and 2-3. but I noticed the headsink was not solderwell and was loose once I unscrewed the cover that was screwed into it. the solder wasn't stuck to the trace I figured I better remove and test. It doesn't test to well. When I test I get the following 1-3 only 1 I don't have ol on mine so not sure if that means its open or infinity
            2-3 800ohms and 1-2 the same as 1-3. Nothing or just 1. Basiclly it doesn't change just says 1. on the board its set up as G D S which is 1 2 3
            The numbers on it say U401 and below that is BE6H1S
            I guessing its bad , but if it is. Im not sure what the replacement part would be. I didn't find any info and I'm still learning on finding substitute parts.

            I can send a pic tommorow if need be I will attach a pic whee this is located
            Thanks
            Nick
            Attached Files

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              #26
              Re: Acer 1716B no picture, Blinking power light

              Originally posted by nico95 View Post
              When I test I get the following 1-3 only 1 I don't have ol on mine so not sure if that means its open or infinity
              What brand/make and model is your multimeter?

              1 on manual ranging meters usually means inifinty. The 1 should be on the left hand side of the display.

              Transistors are usually bad if they are shorted (ohms < 20). If you are getting infinity, 800 ohms, and 800 ohms, that is a good transistor.
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                #27
                Re: Acer 1716B no picture, Blinking power light

                It's a Craftsman. Your right the 1 is on the left side. It will be there before you test anything also. So beasiclly it didn't change when I tested.

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                  #28
                  Re: Acer 1716B no picture, Blinking power light

                  Originally posted by nico95 View Post
                  It's a Craftsman. Your right the 1 is on the left side. It will be there before you test anything also. So beasiclly it didn't change when I tested.
                  Craftsman makes a lot of meters. Which model?

                  If you touch your two probes together, what ohms reading do you get?
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                    #29
                    Re: Acer 1716B no picture, Blinking power light

                    Sorry, its Model 82141
                    If I touch the probes. THe numbers do change. from a 1 on the left to a .2 on the 200Ohms scale

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                      #30
                      Re: Acer 1716B no picture, Blinking power light

                      Originally posted by nico95 View Post
                      Sorry, its Model 82141
                      If I touch the probes. THe numbers do change. from a 1 on the left to a .2 on the 200Ohms scale
                      Touching the probes is a quick test to tell you the ohms test is working. 0.2 ohms is what I expect.

                      1 indicates inifinity or over range. My meter displays 0L.
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                        #31
                        Re: Acer 1716B no picture, Blinking power light

                        So the Transistor may be ok then? I don't actually see it change, or flash real quick like I noticed before on a lower scale(20 OHMS) it would change real quick then go to 1.
                        Just making suring I explaing it right

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                          #32
                          Re: Acer 1716B no picture, Blinking power light

                          Originally posted by nico95 View Post
                          So the Transistor may be ok then? I don't actually see it change, or flash real quick like I noticed before on a lower scale(20 OHMS) it would change real quick then go to 1.
                          Just making suring I explaing it right
                          The FET is good (GDS). I understand what you are saying.

                          If you set your multimeter to 2000K ohm on the dial and retest you might actually get a reading that is not 1. If it stills show 1, that means the resistance is greater than 2M.

                          This is why I prefer autoranging meters.
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                            #33
                            Re: Acer 1716B no picture, Blinking power light

                            Sounds good, one less thing to buy
                            I guess I might have to look in to a autorangin one in the future. That sound srather handy. I do have a analog meter, but haven't gotten to use it.

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                              #34
                              Re: Acer 1716B no picture, Blinking power light

                              I just went to order the parts and Digikey and aparentlly all the other places have no stock of KSD1691. The only thing they did have was a a replacement part that was rated the same accept the Amps. it was 4 Amps rated instead of 5. I'm thinking I better not get it. Since the originals shorted but would this work?
                              Thanks,

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                                #35
                                Re: Acer 1716B no picture, Blinking power light

                                Originally posted by nico95 View Post
                                it was 4 Amps rated instead of 5.
                                Well I'm not a circuit board designer, but if the fuse (I can't see it in your picture) is rated for 3A, I think you can go with the lower 4A replacement part.

                                There may be more than one fuse on the power/inverter board including a picofuse (starts with PF).
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                                  #36
                                  Re: Acer 1716B no picture, Blinking power light

                                  Originally posted by nico95 View Post
                                  t was 4 Amps rated instead of 5. I'm thinking I better not get it. Since the originals shorted but would this work?
                                  Hmm, I repaired a Acer 1716 about 2 months ago, but it is not a 1716B. The 1716 that I fixed had a 2A/250V main fuse.

                                  On some Benq boards the c5707s are famous for being shorted because of the poorly soldered transformers. You may want to resolder your transformer pins to prevent future KSD1691s from shorting.
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                                    #37
                                    Re: Acer 1716B no picture, Blinking power light

                                    Hi,
                                    I finally was able to get some KSD1691s and replacement caps. Resoldered all the caps last night but ran into another problem, I needed a little assistance on. A few traces partialy came off. I had 2 caps do that yesteday and noticed one of the dual Diode traces and one of the Transitor Traces had this probelm. It looks like they each are have about 1/3 to a little less than 1/2 of the traces gone. Of the 4 I looks like they attached part of the trace is still part of the circuit. Should I just leave them, or connected a wire or solder the connection further back(for the caps if possible) to a connection in the circuit. I noticed on the caps that there are traces that are not used that I could soldier the cap to or a jumper wire. ANy help would be greatlly appreciated. I had to do the smoke test and have a problem because of the traces
                                    Thanks,

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                                      #38
                                      Re: Acer 1716B no picture, Blinking power light

                                      A really good clear focused picture (close up) using the manage attachments function would help us make a judgement call.
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                                        #39
                                        Re: Acer 1716B no picture, Blinking power light

                                        Thanks, I will post some pics tommorow after work, when I have a little bit of daylight to get a better,clearer pics(hopefully)
                                        Thanks

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                                          #40
                                          Re: Acer 1716B no picture, Blinking power light

                                          I just attached the pics, I thought there where 2 capacitors but I can't find the other one. I didn't cut the first one you can see part of it soldier well but not the one corner.
                                          Attached Files

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