Forum > LCD TV forum

Intro plus help for Medion MD33332 Now fixed

<< < (3/3)

OldLes:
Thanks guys, now the info is coming in.
Earlier, I said "  Jordan, your references confused me. Google just leads me to an IC, not a chassis, or am I missing something?  ". Simple answer, I was missing something. Most of the time I have read the replies "anon"; I now see the pdf is only visible whilst logged on. Lesson learned. Thanks Jordan, I will study all three manuals with interest.
Kieth, it looks as if you are correct, it must be an adjustable one. The (output volts) - (ref pin volts) = 1.242V and 1.237V on my two 1084 ICs. Since this is not equal to 1.8, 2.5 or 3.3V (data from a sheet I googled) nor 1.5v (Kieth's data) then that makes " adjustable" the logical choice. My datasheet also indicates it is a "D" package, whilst the one my pal found was a D2 package.
I scoped the pins for ripple, measuring 0.85V p-p on one IC, and 0.6V p-p on the other, with no obvious change as the fault developed as the suspect IC warmed up. This was at a frequency of about 1.1MHz (0.92 micro secs cycle time)
I think I now have enough info to order the correct 1084 version.
Thanks again, and I will report back after I get one and fit it.
OldLes.

OldLes:
I ordered a replacement 1084 chip, had to buy five, so total bill £19.
I replaced the IC, and ran soak test with no problems.
Should anybody else have one of these, when you remove the signals etc board, all the plugs fall more or less in the correct place. However, there is a multi lead near to the fauly 1084 (U5) which feeds off (to display I assume) from a 36 (ish) pin connection, but the plug has six less places in the plug. There is an arrow on the PCB suggesting Pin1, but in fact the plug is offset so the other end is fully populated!
I could not fully relate the circuits to any of the three which Jordan linked to, so I guess they change things around every couple of months or so during production.
Thanks again for all help, OldLes.

Navigation

[0] Message Index

[*] Previous page