Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]

Announcement

Collapse
No announcement yet.

User Profile

Collapse

Profile Sidebar

Collapse
Avatar
jorpec
Member
Last Activity: Today, 04:12 PM
Joined: 02-05-2015
Location: Lisboa
  •  
  • Filter
  • Time
  • Show
  • Source
Clear All
new posts
  • jorpec
    replied to Changing the scale of an analog meter
    in General Electronics Technical Discussion
    Re: Changeing the scale of an analog meter



    Thanks
    Yes the ATL431 is ideal it needs a very low current to work 0.035mA...
    See more | Go to post

    Leave a comment:

  • jorpec
    replied to Changing the scale of an analog meter
    in General Electronics Technical Discussion
    Re: Changeing the scale of an analog meter



    Thanks for the schematic, works perfectly no variation on the meter even heating the TL431 with a heat gun at 100ºC, but even the total current consumption of this circuit isn't much, around 4.5mA at 4.2V will slowly drain the battery, using only the analog meter it consumes 0.22mA at 4.2V. I wonder if there is a TL431 equivalent that needs less than 1mA to work, or i just add a switch when not using it...
    See more | Go to post

    Leave a comment:

  • jorpec
    replied to Changing the scale of an analog meter
    in General Electronics Technical Discussion
    Re: Changeing the scale of an analog meter



    Must be something that wont consume much current or would drain the battery




    Thanks, i will look into it...
    See more | Go to post

    Leave a comment:

  • jorpec
    started a topic Changing the scale of an analog meter
    in General Electronics Technical Discussion

    Changing the scale of an analog meter

    Hi

    I want to change the scale of an analog meter, to monitor the charge of an li-ion single cell, so the needle at the end would point 4.2 volts and the 0 on the meter would point 2.5 volts or so, i tried to add diodes or a zener in series with the meter but the changes of the ambient temperature also changes the voltage value on the meter
    I wonder how i can accomplish this so the meter would be precise at any temperature ?

    Thnaks
    See more | Go to post
  • jorpec
    started a topic Loewe opta R125 distorted sound at high volume
    in Troubleshooting Audio Equipment

    Loewe opta R125 distorted sound at high volume

    Hi
    I'm restoring this vintage radio, that had a very weak sound output, after replacing the electrolytic capacitors the sound volume improved but when the volume reach the middle of the knob starts to distort, its like the speaker overdrive and saturates, but only at lower frequencies even with the tone knob at minimum on bass frequencies. i have tried with other speakers but is the same.
    Any idea what causes this ?
    Below the schematic

    Thanks...
    See more | Go to post
  • jorpec
    replied to Eeprom dump thread!
    in Troubleshooting TVs and Video Sources
    Re: Eeprom dump thread!

    Hello

    I really appreciate if any member could share a dump for a TV LED Blaupunkt 39/401l, or some other brand that uses the same mainboard/panel combo

    Modelo Nr: 39/401L-GB-5B-1HUHBKUP-EU
    Modelo Ref: B39A401TCUHD

    Mainboard: TP.MSD309.BTU87
    Panel: v390DK1-LS1


    Thanks in advance
    See more | Go to post

    Leave a comment:

  • jorpec
    replied to Mitsai 22VLM12 with blinking led (advice needed)
    in Troubleshooting TVs and Video Sources
    Re: Mitsai 22VLM12 with blinking led (advice needed)

    Thanks for the reply's

    I checked the ch341 thread, it seems it can program this eeprom, so i will order one from ebay, and i will try
    See more | Go to post

    Leave a comment:

  • jorpec
    started a topic Mitsai 22VLM12 with blinking led (advice needed)
    in Troubleshooting TVs and Video Sources

    Mitsai 22VLM12 with blinking led (advice needed)

    Hello, I have this lcd tv when i power on the led never stop blinking and the tv does not turn on

    I searched here and on other sites, the problem is the eeprom, if i freeze it works, so i'm thinking of remove the chip, then freeze it, and using a programmer read the data, and then copy to another chip

    To do so i need a programmer, so i need advice about which programmer and software i should use, at ebay i saw a CH341A programmer, i dont know if is the right one for doing this, i also plan to use it on laptops bios chip, it would be great if it can read both lcd/tv...
    See more | Go to post
  • jorpec
    replied to TV Blaupunkt 32/147I-GB stuck in standby
    in Troubleshooting TVs and Video Sources
    Re: TV Blaupunkt 32/147I-GB stuck in standby

    Thanks for the fast reply



    I found a site that has a firmware that matches my mainboard





    First i checked the voltages, all looks good, then i did a google search, and found some posts saying the problem was solved by reprogramming the eeprom, even at ebay some seller is selling a programed eeprom to solve this problem. But i suspect the reason of the firmware corruption isnt the eeprom but the some bad connection under the processor. This kind of boards is really...
    See more | Go to post

    Leave a comment:

  • jorpec
    started a topic TV Blaupunkt 32/147I-GB stuck in standby
    in Troubleshooting TVs and Video Sources

    TV Blaupunkt 32/147I-GB stuck in standby

    Hi

    I've an TV Blaupunkt 32/147I-GB stuck in standby (red led), that wont power on, via remote or buttons on tv, I suspect a faulty eeprom/firmware.

    Since many years i dont reprogram eeproms, i dont know what programer and software i should use. Years ago i used Pony Prog with some home made board connected to the serial port.

    So i need some advice about what programer and software i should use.


    Thanks in advance
    See more | Go to post
  • jorpec
    started a topic Sanyo 32" LED TV thin horizontal lines
    in Troubleshooting TVs and Video Sources

    Sanyo 32" LED TV thin horizontal lines

    Hi

    I have a SANYO LCE32LM08(those cheap tvs with vestel boards) LED TV that's got thin equidistant horizontal black lines covering the full screen. The picture underneath the lines at some images looks ok but on anothers has some strange colors(looks like the old CRT when they have a weak cathode). I'm thinking faulty T-Con board. Any thoughts ?

    I already heated the main board and t-con with an hair-drier but no effect

    Here the boards a panel refs:

    LCD Panel - LC320EXN
    T-CON - 6870C-0370A
    MAINBOARD - 17MB65


    Thanks...
    See more | Go to post
    Last edited by jorpec; 09-13-2017, 04:50 AM.
  • jorpec
    replied to New Members - please post your introductions here
    in Announcements & Related News
    Re: New Members - please post your introductions here

    Hi, i'm from Portugal

    I'm a technician and have repairing tvs and such, since the CRT, and from the time there was no internet, now is much more easy to get the information, and on every search i made about some electronic equipment faults i came across this site
    See more | Go to post

    Leave a comment:

  • jorpec
    replied to HELP! BIOS Password Removal
    in BIOS Requests ONLY!
    Re: HELP! BIOS Password Removal

    Hi

    Check on the mainboard for a "xxx" or "b500" and do a short on these points usualy they are near the ram...
    See more | Go to post

    Leave a comment:

No activity results to display
Show More
Working...
X