Electronics > Repair

Hioki 3532-50 LCR Repair (One major problem solved, SM still wanted)

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Martin72:

--- Quote ---you have a dead backlight  it seems ??
--- End quote ---

Actually I think so, but you got a menu where you could turn it on or off - when the panel would recognize my touch...
Try it out again, report.
Also pics from the display will follow...

coromonadalix:
you where faster than me writting my previous thread  loll  i was editing some infos

For the lcd  it could be some zebra strips  with bad contacts ???  be sure you have nothing who touch  some drivers ic's on the lcd ....

This lcd should be easily dismantable, with rotated frame pins,  remove solder blobs who ground the black frame   ??

Martin72:
Thank you for the advices  :-+
I´m into test&repair since 20yrs but you´ll never know everything.
Interesting thing:

After unpowered for say a half hour, I´ve powered on again....Nothing.
Leave it to on...After say a minute or little more, system boots up.
Then when you turn off and on again, system boots up immediately...Whats going on..
Need a schematic...
Nevertheless, pics from the display will come soon.

coromonadalix:
Maybe over time   not sure if you have some ram  corruption  or sluggyness

I had equipement with some ram failure, it was booting very slow,  but was perfectly functionning, changed the part, and bam it was speedy ??

Not sure of this one,  something could affect it's boot time,  but still seems to function normally after a while

And the usual suspects are  the supply lines, noises, spikes,  bad capacitors  ...


I would say to get an idea:  check every part number on the cpu board,  try to get their datasheet, and try to figure out some basic functions  like watchdog, reset circuitry etc ...


And  i doubt  Hioki will give an schematic, you may (and i hope not)  never get an service manual ??

 

Martin72:
Yepp, will examine also the power lines which are going to the controller board with scope.
Maybe today, maybe tomorrow.
Here a dedicated pic of the LCD panel´s backside.
It´s from Powertip, model PG320240C

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