ViewSonic VP201b

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  • olenac
    New Member
    • Apr 2009
    • 3

    #21
    Re: ViewSonic VP201b

    Hi guys,

    I have one of that LCD VP201 that has the inverter fuses open. I replaced both with a 2A picofuse as explained in this post. Now the monitor powers and when it scans through the DVI-A, DVI-D, D-SUB it tells the message “No signal” and goes to sleep mode (amber light). It won't recognize any input into it. The amber light stays on and the monitor can be cycled on/off but I cannot get it to display anything in any of the inputs. I have verified in the controller board all the capacitors and they look ok and have good readings with a cap meter; also I have verified all the transistors and diodes for open or shorts and nothing bad.

    Thanks all for any help or suggestion on this one,

    mas

    Comment

    • EGuevarae
      Badcaps Legend
      • Nov 2008
      • 1336
      • USA

      #22
      Re: ViewSonic VP201b

      Originally posted by olenac
      Hi guys,

      I have one of that LCD VP201 that has the inverter fuses open. I replaced both with a 2A picofuse as explained in this post. Now the monitor powers and when it scans through the DVI-A, DVI-D, D-SUB it tells the message “No signal” and goes to sleep mode (amber light). It won't recognize any input into it. The amber light stays on and the monitor can be cycled on/off but I cannot get it to display anything in any of the inputs. I have verified in the controller board all the capacitors and they look ok and have good readings with a cap meter; also I have verified all the transistors and diodes for open or shorts and nothing bad.

      Thanks all for any help or suggestion on this one,

      mas
      Welcome to the forums
      Post a picture (clear one) of the signal/main/video board to see if I can get my hands on an exact one to try to help you.
      There are 10 kind of people in this world: those that understand binary, and those who don't.
      • ASUS ROG Maximus IX Code
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      Comment

      • PlainBill
        Badcaps Legend
        • Feb 2009
        • 7034
        • USA

        #23
        Re: ViewSonic VP201b

        Originally posted by olenac
        Hi guys,

        I have one of that LCD VP201 that has the inverter fuses open. I replaced both with a 2A picofuse as explained in this post. Now the monitor powers and when it scans through the DVI-A, DVI-D, D-SUB it tells the message “No signal” and goes to sleep mode (amber light). It won't recognize any input into it. The amber light stays on and the monitor can be cycled on/off but I cannot get it to display anything in any of the inputs. I have verified in the controller board all the capacitors and they look ok and have good readings with a cap meter; also I have verified all the transistors and diodes for open or shorts and nothing bad.

        Thanks all for any help or suggestion on this one,

        mas
        I had this happen on a close relative of that monitor TWICE. Once was user error - I didn't seat the DVI cable FIRMLY into the socket. The other case appeared to be the main logic board - it didn't like 1600 x 1200, but would work at lower resolutions.

        PlainBill
        For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

        Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

        Comment

        • olenac
          New Member
          • Apr 2009
          • 3

          #24
          Re: ViewSonic VP201b

          Hi Guys:

          Thanks for the feedback. I test the board again and found that diode in position D602 in the bottom of the video board was shorted. I replaced that with a spare board I have but still the same problem. I have a voltage in this diode of 2.43 which is the input for IC601 and IC603. There is some output voltage from this 2 Ic`s but I don't know if they are ok. If any one knows the value of this diode in order to buy a replacement please advice. I notice that this board is making some noise near to IC401 but is very difficult to find from were exactly. Attached some pictures of this video board.

          I will appreciate all the help you can bring in order to fix this LCD.
          Attached Files

          Comment

          • Thornapple
            New Member
            • May 2009
            • 9

            #25
            Re: ViewSonic VP201b

            I was almost ready to give up on my VP201b, but then I found Badcaps and this thread!

            The display on my VP201b blanked suddenly leaving just the green LED lit. Following this thread, I have found that one of the tiny fuses on the inverter has blown. Other diagnostics:
            i) the power supply board is outputting 18V so I think the PSU is OK.
            ii) I have tested the two electrolytics on the inverter ('Rubycon', 220uF 35V). One is OK, the other is over 10 times the expected value (2.6mF). That's tested in-circuit though.

            So it might just be a question of changing the blown fuse. The one mentioned in the thread (576-0429002.wrm) is only available from USA (Mouser) and I will have to pay £12 postage (UK pounds). That's OK, but I'd like to be as sure as possible I won't need any other parts; if I have to go back to Mouser a second time that's another £12 (plus what Customs & Excise slaps on). So are there any other basic tests I can do? In particular, could someone explain Eguevarae's test in non-technical terms; I mean 'Check also if voltage is reaching the inverter (from ground to a fuse you should get a V reading)'. I'm not sure what is 'ground' and which side of the fuse he means.

            A few more questions:

            a) Do these tiny fuses snap out like domestic fuses or are they soldered in?
            b) If the latter, can I just solder the new one on top of the old one (unsoldering things is horrible)
            c) One of the posts mentions 'picofuses'. Are these the same as 'Pico Fuses' available over here, i.e. fuses with axial leads? Would these need to be soldered in? Would I have to drill holes through the PCB??
            d) I think I might have some 2A 20mm glass fuses, maybe even quick blow. To test if the fuse is the only problem I might be able to connect one of these across the blown fuse using small croc clips and switch on...or would this be suicidal?

            TC

            Comment

            • PlainBill
              Badcaps Legend
              • Feb 2009
              • 7034
              • USA

              #26
              Re: ViewSonic VP201b

              Originally posted by Thornapple
              I was almost ready to give up on my VP201b, but then I found Badcaps and this thread!

              The display on my VP201b blanked suddenly leaving just the green LED lit. Following this thread, I have found that one of the tiny fuses on the inverter has blown. Other diagnostics:
              i) the power supply board is outputting 18V so I think the PSU is OK.
              ii) I have tested the two electrolytics on the inverter ('Rubycon', 220uF 35V). One is OK, the other is over 10 times the expected value (2.6mF). That's tested in-circuit though.

              So it might just be a question of changing the blown fuse. The one mentioned in the thread (576-0429002.wrm) is only available from USA (Mouser) and I will have to pay £12 postage (UK pounds). That's OK, but I'd like to be as sure as possible I won't need any other parts; if I have to go back to Mouser a second time that's another £12 (plus what Customs & Excise slaps on). So are there any other basic tests I can do? In particular, could someone explain Eguevarae's test in non-technical terms; I mean 'Check also if voltage is reaching the inverter (from ground to a fuse you should get a V reading)'. I'm not sure what is 'ground' and which side of the fuse he means.

              A few more questions:

              a) Do these tiny fuses snap out like domestic fuses or are they soldered in?
              b) If the latter, can I just solder the new one on top of the old one (unsoldering things is horrible)
              c) One of the posts mentions 'picofuses'. Are these the same as 'Pico Fuses' available over here, i.e. fuses with axial leads? Would these need to be soldered in? Would I have to drill holes through the PCB??
              d) I think I might have some 2A 20mm glass fuses, maybe even quick blow. To test if the fuse is the only problem I might be able to connect one of these across the blown fuse using small croc clips and switch on...or would this be suicidal?

              TC
              In less technical terms, measure the voltage from the negative output of the power supply or any of the screws used to hold a board in place to each side of the fuse (or fuses) in question. If you read the same voltage as the power supply output (18 Volts in this case) to each side of the fuse, the fuse is good. If you don't read 18 volts to either side, the problem is elsewhere. If you read it to only one side, the fuse is bad. I STRONGLY urge you to replace both capacitors on the inverter board. One is certainly bad, the other may follow.

              Answers to other questions:

              a. Soldered in

              b. Yes. But at some time check out a product called Chip-Quik. It makes desoldering easier.

              c. They are the same. I would form the leads so you can solder the Picofuse to the ends of the original fuse. It doesn't meet Mil-Spec, so you'll never be able to use the monitor on a warship, but I doubt you will lose any sleep over that.

              d. That is a valid way of testing.

              PlainBill
              For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

              Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

              Comment

              • Thornapple
                New Member
                • May 2009
                • 9

                #27
                Re: ViewSonic VP201b

                Thanks Plainbill, I will certainly change the capacitors. Unfortunately I don't think Chip Quik is available over here so I'll have to do without it.

                TC

                Comment

                • EGuevarae
                  Badcaps Legend
                  • Nov 2008
                  • 1336
                  • USA

                  #28
                  Re: ViewSonic VP201b

                  Originally posted by PlainBill
                  c. They are the same. I would form the leads so you can solder the Picofuse to the ends of the original fuse. It doesn't meet Mil-Spec, so you'll never be able to use the monitor on a warship, but I doubt you will lose any sleep over that.
                  There are 10 kind of people in this world: those that understand binary, and those who don't.
                  • ASUS ROG Maximus IX Code
                  • Intel Core i5-7600K 3.8GHz
                  • 16gb GSKILL TridentZ RGB DDR4-3200
                  • 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
                  • Windows 10 Pro x64
                  • GeForce GT1050
                    2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )

                  Comment

                  • Thornapple
                    New Member
                    • May 2009
                    • 9

                    #29
                    Re: ViewSonic VP201b

                    Thought I'd come back to post my VP201b success story.

                    I got some solderable fuses and replacement caps. I chickened out of replacing the caps as the new ones were quite a bit bigger than the existing caps. I soldered the one fuse that was definitely faulty. It's the thing weirdly suspended on red wires. I never said it was pretty...

                    https://www.badcaps.net/forum/attach...id=10099&stc=1

                    ...but it works!

                    https://www.badcaps.net/forum/attach...id=10100&stc=1

                    This LCD screen cost me about £550 three and a bit years ago, whatever that is or was in US Dollars. I'm not sure what is most gratifying, the £550 or the raspberry to Viewsonic who have failed to coerce me into buying another screen.

                    Thanks everyone for this moral victory!
                    Attached Files

                    Comment

                    • EGuevarae
                      Badcaps Legend
                      • Nov 2008
                      • 1336
                      • USA

                      #30
                      Re: ViewSonic VP201b

                      Originally posted by Thornapple
                      suspended on red wires. I never said it was pretty...but it works!

                      There are 10 kind of people in this world: those that understand binary, and those who don't.
                      • ASUS ROG Maximus IX Code
                      • Intel Core i5-7600K 3.8GHz
                      • 16gb GSKILL TridentZ RGB DDR4-3200
                      • 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
                      • Windows 10 Pro x64
                      • GeForce GT1050
                        2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )

                      Comment

                      • dantm
                        Member
                        • Mar 2009
                        • 26

                        #31
                        Re: ViewSonic VP201b

                        Now that you guys have had great success with these fixes, can you advise a poor man (me! :-) at:

                        https://www.badcaps.net/forum/showthread.php?t=7038

                        Thank you!

                        Comment

                        • PolishPaul
                          New Member
                          • May 2009
                          • 6

                          #32
                          Re: ViewSonic VP201b

                          Excellent thread!

                          My Viewsonic vp201b went dark one night. I love this monitor, its very nice so i had to save it. What was rough is taking it apart - besides the screws, all you need to do is pry the edge with your (long) nails.

                          Long story short, my left fuse on the inverter was bad. I just unsoldered/popped it off and jumped it with a sliver of 'soldering wick'. Which BTW you can use to unsolder things - get it at your local Radioshack.

                          Anyhow, put it together and bam it works. This thread showed me the fuses and it was right on. Thanks so much! I'll probably do the 'external' fuse solution some how. Important thing is that it works!

                          QUESTION however... How do you know the component number? Where can one get schematics for these things? I'm not expert, but I'm sure i can follow a schematic...

                          Oh and any advice on a surface solder? The used wick sliver grabbed the surface really nice.. how would you do a good surface connection?
                          Last edited by PolishPaul; 05-27-2009, 08:27 PM.

                          Comment

                          • EGuevarae
                            Badcaps Legend
                            • Nov 2008
                            • 1336
                            • USA

                            #33
                            Re: ViewSonic VP201b

                            Originally posted by PolishPaul
                            Excellent thread!

                            My Viewsonic vp201b went dark one night. I love this monitor, its very nice so i had to save it. What was rough is taking it apart - besides the screws, all you need to do is pry the edge with your (long) nails.

                            Long story short, my left fuse on the inverter was bad. I just unsoldered/popped it off and jumped it with a sliver of 'soldering wick'. Which BTW you can use to unsolder things - get it at your local Radioshack.

                            Anyhow, put it together and bam it works. This thread showed me the fuses and it was right on. Thanks so much! I'll probably do the 'external' fuse solution some how. Important thing is that it works!

                            QUESTION however... How do you know the component number? Where can one get schematics for these things? I'm not expert, but I'm sure i can follow a schematic...

                            Oh and any advice on a surface solder? The used wick sliver grabbed the surface really nice.. how would you do a good surface connection?
                            See post #16 for part number. And normally you can't get schematics (for most of the units). Oh, and welcome to the forums.
                            There are 10 kind of people in this world: those that understand binary, and those who don't.
                            • ASUS ROG Maximus IX Code
                            • Intel Core i5-7600K 3.8GHz
                            • 16gb GSKILL TridentZ RGB DDR4-3200
                            • 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
                            • Windows 10 Pro x64
                            • GeForce GT1050
                              2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )

                            Comment

                            • PolishPaul
                              New Member
                              • May 2009
                              • 6

                              #34
                              Re: ViewSonic VP201b

                              i saw the part #, but how did you decipher what it is? I'm trying to figure out how to obtain such info when fixing consumer electronics.

                              Comment

                              • PolishPaul
                                New Member
                                • May 2009
                                • 6

                                #35
                                Re: ViewSonic VP201b

                                can't seem to edit my post.. but, i was able to buy a mini ceramic 2A fuse at Radioshack part # 270-0005.

                                I used the wick as a wire (don't have any braided wire) wrapped around the fuse ends, the other end grabbed the board surface really nicely, isolated with electric tape and off i go!

                                Comment

                                • EGuevarae
                                  Badcaps Legend
                                  • Nov 2008
                                  • 1336
                                  • USA

                                  #36
                                  Re: ViewSonic VP201b

                                  Originally posted by PolishPaul
                                  can't seem to edit my post.. but, i was able to buy a mini ceramic 2A fuse at Radioshack part # 270-0005.

                                  I used the wick as a wire (don't have any braided wire) wrapped around the fuse ends, the other end grabbed the board surface really nicely, isolated with electric tape and off i go!
                                  Pics?
                                  There are 10 kind of people in this world: those that understand binary, and those who don't.
                                  • ASUS ROG Maximus IX Code
                                  • Intel Core i5-7600K 3.8GHz
                                  • 16gb GSKILL TridentZ RGB DDR4-3200
                                  • 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
                                  • Windows 10 Pro x64
                                  • GeForce GT1050
                                    2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )

                                  Comment

                                  • dcast11
                                    New Member
                                    • Jun 2009
                                    • 1

                                    #37
                                    Re: ViewSonic VP201b

                                    I Also Repaired Inverter Replacing A Fuse, But I Must Press Button 2 Down On The Screen So That It Gets The D-sub Signal. Everytime I Turn It Off It Starts Checking For Dvi-d, Like It Doesn´t Detects Signal, It Goes To Standby Or Orange Led State(it Goes To Sleep). So I Press The 2 Button And It Detects The Vga Signal And The Image Appears. Does Someone Knows How To Solve This Issue?

                                    Comment

                                    • PlainBill
                                      Badcaps Legend
                                      • Feb 2009
                                      • 7034
                                      • USA

                                      #38
                                      Re: ViewSonic VP201b

                                      Originally posted by dcast11
                                      I Also Repaired Inverter Replacing A Fuse, But I Must Press Button 2 Down On The Screen So That It Gets The D-sub Signal. Everytime I Turn It Off It Starts Checking For Dvi-d, Like It Doesn´t Detects Signal, It Goes To Standby Or Orange Led State(it Goes To Sleep). So I Press The 2 Button And It Detects The Vga Signal And The Image Appears. Does Someone Knows How To Solve This Issue?
                                      Go into the menu and select D-Sub as your default input?

                                      PlainBill
                                      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                      Comment

                                      • EGuevarae
                                        Badcaps Legend
                                        • Nov 2008
                                        • 1336
                                        • USA

                                        #39
                                        Re: ViewSonic VP201b

                                        Originally posted by PlainBill
                                        Go into the menu and select D-Sub as your default input?

                                        PlainBill
                                        You read my mind ...
                                        There are 10 kind of people in this world: those that understand binary, and those who don't.
                                        • ASUS ROG Maximus IX Code
                                        • Intel Core i5-7600K 3.8GHz
                                        • 16gb GSKILL TridentZ RGB DDR4-3200
                                        • 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
                                        • Windows 10 Pro x64
                                        • GeForce GT1050
                                          2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )

                                        Comment

                                        • PlainBill
                                          Badcaps Legend
                                          • Feb 2009
                                          • 7034
                                          • USA

                                          #40
                                          Re: ViewSonic VP201b

                                          Originally posted by eguevarae
                                          You read my mind ...
                                          Exactly!!

                                          PlainBill
                                          For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                          Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                          Comment

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