gday looking for a ESR/LCR meter to test capacitors in circuit, a better multi meter and a beginner oscilloscope
trying to learn how to diagnose/repair 80s-90s PCs motherboards, PSUs, synthesizers, also general repairs some modern TVs/music equipment, DIY synth projects.
and have a garage full of amplifiers to learn from, the end game figuring out enough to fix up those deadly CRTs lol
my multi meters currently DT830D and DT830B. looking at the eev BM branded ones or the sanwa pm3?
with ESR/LCR should i get a cheap ESR for basic in circuit dead or not tests, then get a LCR separately for more accurate out of circuit tests or not worry about LCR at all yet?
tough trying to pick one out of the more commonly recommended on the fourm, some are more difficult to source than others:
DER EE DE-5000 $168aud with TL21 and TL32
or $280aud for the complete set, dunno why the tweezers nearly cost as much as the unit? could only find em on Ebay Japan listings. the short leads don't seem ideal looks like there's mods but can throw off the readings?
BSIDE ESR02PRO $37aud looks like all the other similarly priced clones but atleast has some 50v discharge protection
XJW01 $117 good variety of attachments, big brother to all the cheapy clones?
BobParkers Blue1assembled is
$213aud from Malaysia the sites selling them look insanely out of date and would not trust using a credit card on em lol, weird that it's an aussie maker but nobody in aus seems to sell em :/ doesn't appear the Blue v2 is available anywhere? only ohm reading though
MESR-100 v1 $67aud v2 $84aud version 2 added in circuit testing? looked like others used v1 to test in circuit fine
Atlas ESR70 $142aud recommended a lot but some suggest getting the LCR40 with it? which would be roughly $305aud for both
has 50v protection?
its kinda crazy for the price there's no backlit screen on this or most of em considering ya might be at odd angles, atleast with a longer lead its fine but the shorter one
would get awkward fastis there a common glue for keeping caps in place? i read some hotglues can turn acidic over time
Oscilloscopes: like a dummy i jumped the gun and got a HP 54845A Infinium scope at auction before i realized its size(rip shipping fees) and maintenance ital likely need, then saw Daves video saying it's not an everyday scope
trying to find a more beginner friendly scope for now, hopefully when it arrives i can get it fixed up and trade/sell towards another
TechCornerTV has a really helpful video going over 5 models, should i go for one with a function generator? seems itad be helpful for audio but i could get that later on. Looked into those usb scopes but knowing my dumbass id fry my lappy along with it lol.
FNIRSI 1014D $239
OWON SDS1102 $290 no function generator
Hantek DSO2D10 $308
First major repair attempt is a 2013 Samsung UA40F6400AM tvs psu board:
L42X1QV_DSM (image 7.27mb 4600x3456)how do you tell if a board is lead or lead free solder? the psu board looks like a fairly old design but i don't know if every company switched to lead free if at all by 2013?
TV clicks when powered, fuses continuity test fine, no bulging/leaky caps, looking at other boards online they replace the 3x 200v 68uF and sometimes 2x 450v 68uF unless they aren't repairs but samsung using different brands?
With the caps looking fine that pushed me to seek out proper tools for these types of repairs.
Attached the only schematic i could find but its low quality unfortunately, Got it from elektrotanya hopefully okay to attach here otherwise let me know and ill remove it.edit: removed the attached schematic didn't seem to match. i did however find
another blog site that lists a slight variant: LX42X1Q D
HS BN44-00622
B variant, slightly different layout but much more clear schematics if that helps.
might as well add the cap list for anyone who's trying to repair this and stumbles into this post since most of them where glued with the specs hidden: 2x 25v 390uF, 4x 350v 22uF, 1x 450v 10uF, 2x 450v 68uF, 3x 200v 68uF, 1x 25v 560uF, 2x 50v 47uf, 2x 50v 10uf, 1x 50v 22uf
any suggestions and assistance is greatly appreciated.