Main Restorations Software Audio/Jukebox/MP3 Everything Else Buy/Sell/Trade
Project Announcements Monitor/Video GroovyMAME Merit/JVL Touchscreen Meet Up Retail Vendors
Driving & Racing Woodworking Software Support Forums Consoles Project Arcade Reviews
Automated Projects Artwork Frontend Support Forums Pinball Forum Discussion Old Boards
Raspberry Pi & Dev Board controls.dat Linux Miscellaneous Arcade Wiki Discussion Old Archives
Lightguns Arcade1Up Try the site in https mode Site News

Unread posts | New Replies | Recent posts | Rules | Chatroom | Wiki | File Repository | RSS | Submit news

« previous next »
Pages: [1]
  
Go Down

Author Topic: Makvision 2425  (Read 1910 times)

0 Members and 1 Guest are viewing this topic.

lilshawn

  • Trade Count: (+3)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 7514
  • Last login:Yesterday at 06:58:44 pm
  • I break stuff...then fix it...sometimes
Makvision 2425
« on: April 22, 2010, 10:37:45 am »
Have a Makvision 2425 that was exhibiting a foldover on the top portion of the screen.

brought the unit back for repair and it failed to startup. Replaced the cap in the power supply (c511 upcaped to 200uf) and booted the chassis.

it starts up now, just now it immediately fried IC3 (LA7833). no big deal, i replaced it and it's cooked it again. checked the power resistors and the caps for the chip and all are still good.

any ideas peoples???
« Last Edit: April 22, 2010, 11:12:42 am by lilshawn »
Logged

grantspain

  • I personally prefer "bog trotter"
  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 6177
  • Last login:July 25, 2025, 09:21:43 am
Re: Makvision 2425
« Reply #1 on: April 22, 2010, 12:56:21 pm »
what does the ic vcc read?
Logged

lilshawn

  • Trade Count: (+3)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 7514
  • Last login:Yesterday at 06:58:44 pm
  • I break stuff...then fix it...sometimes
Re: Makvision 2425
« Reply #2 on: April 22, 2010, 05:32:18 pm »
I haven't had the chance to get at it yet. The second time around in IC3 fiasco, i connected my lightbulb fuse up to it and was a dim flash then dark... monitor sounds like it's trying to start up. figured everything was okay so replaced with the fuse. was greeted with magic smoke from IC3...

i removed IC3 and noted melted plastic on leg 3 of the IC.

checked the caps and resistors and diodes of the circut downstream from leg three and found 2 open caps. 10uf 250volts

guess i'll have to source another IC3 for it tomorrow.
Logged
Pages: [1]
  
Go Up
« previous next »