kenwood tm-742a tx lockup due to one bad cap

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • kc8adu
    Super Moderator
    • Nov 2003
    • 8832
    • U.S.A!

    #1

    kenwood tm-742a tx lockup due to one bad cap

    the only sm lytic in the rig and its bad.its c54.i had replaced with a tantalum before taking the pic.
    rig would power on and get hot.
    it was coming on in tx with no mic attached.
    had burned out display lights so i replaced with white led's.
    Attached Files

Related Topics

Collapse

  • DrDos
    Kenwood KR-6030 vintage stereo ,Old Man Trying to Save a Buck
    by DrDos
    Hello all. I'll try to keep this short. I have no knowledge of electronics. I can use a multimeter and am familiar with caps to some extent. I bought a Kenwood KR-6030 vintage stereo. It need work and so I thought I would recap the thing since I get power to the on switch but nothing else is working. No lights, no sound and so forth. I went to Mouser to order caps and I find I am way over my head. I not only do not know the type of capacitors I need but Mouser and digikey do not accept Kenwood part numbers. I have the info such as 220uF 63v and such but no place to put it. I could buy a recap...
    08-08-2025, 03:16 AM
  • MicroSMD Lab
    MSI MS-16W1 no power, EC replaced by other.
    by MicroSMD Lab
    Hi, I'm working on a MSI laptop, Motherboard number MS-16W11, GF-65 Thin 10SDR-459US. Went to another shop because the screen was flickering, but it was working well on an external monitor. The LCD was ordered and the laptop was returned to the customer and it no longer worked. It was then sent to another tech (by the shop who ordered the LCD) and the EC (ENE KB9028Q) was replaced with a donor from another MSI board with different board number and no programming was done. It looks like work was done on PU6 (TPS51225) as well as one of the GPU mosfets was burnt (I removed all three GPU mosfets)....
    03-27-2025, 07:35 AM
  • Mark R
    The Overseas Only Kenwood Model KR 790
    by Mark R
    I am Repairing this unit. It had many problems. One major one was the power transformer being about 4-5 volts low on the main B+ line which called for 66.5 Vols after the Main Filter caps but only showing about 62 Volts. Caps and the 5 amp Diode bridge were replaced which helped slightly.

    The other strange problem was the small secondary winding from the PT which supplies 18 Volts AC to the "FM FLUORESCENT DISPLAY" circuit, and the small winding that supplies 8 Volts AC to the push button grain of wheat lamps. Those voltages were down from 18 Volts to 16 volts. Which was...
    09-23-2025, 08:27 PM
  • ChaosLegionnaire
    cracked tantalum cap on a video card. safe to apply power without fireworks?
    by ChaosLegionnaire
    please refer to the attached pics. is it safe to apply power with that tantalum cap like that without causing fireworks? i dont wanna burn a hole through the pcb as the gpu chip is on the other side.

    happened to me once before with a shorted mlcc. shorted mlcc on a vrm power phase burned a hole through the pcb power section but thankfully that was nowhere near the gpu chip. but the video card still ended up in the landfill anyway tho as the burn-through was not fixable.

    so do let me know what u think of the chipped tantalum there. thanks....
    09-08-2024, 07:05 PM
  • thesame
    Asus FX505DD REV 2.0 no power after someone replaced the cmos battery with a screwdriver.
    by thesame
    I have a dead FX505D, motherboard FX505DD REV 2.0 , the owner replaced the cmos using a screwdriver and he touched something on the board, since then the laptop its not starting, i have managed to see that U8800 (BQ24780SRUYR) charging IC is getting hot under a thermal camera , i have desoldered it but the laptop still doesn't power on, i also have no voltage at power connector on the board. I also replaced the U8800 but still no power. What should i check next?
    04-22-2024, 01:21 AM
  • Loading...
  • No more items.
Working...