Ive been doing maintenance on dozens of expensive 15kHz crt tv's and pro monitors... Usually just a deflection circuit capacitor replacement brings things back to life after I test the caps for bad esr and replacing the suspect capacitors but am working on a sony pvm 20m2u that worked fine after a recap for about 30 minutes before another component went out and caused image unstableness and a loss of vertical sync.
I reflowed the board, tested all caps again, checked that no resistors had failed open, checked diodes for voltage drop, replaced sync ic chip.... On and on....
I need a scope!
It will be my first scope and will learn to use a scope on it.
I dont want to have to spend $500+ if I dont have to.
Ive seen alot of great reviews and alot of bad reviews on the Fnirsi-1014d which is around $150.
https://www.walmart.com/ip/FNIRSI-1014D-7-inch-Signal-Generator-LCD-2-In-1-Dual-Channel-Input-Desktop-Oscilloscope/278754013?athcpid=278754013&athpgid=AthenaItempage&athcgid=null&athznid=utic&athieid=v0&athstid=CS020&athguid=Vk0iS9SzrNvZuBUN1E4nL1W3L9eGhrc9bGZ_&athancid=null&athena=true&athbdg=L1600My biggest concern with it is with Vertical sensitivity only going down to 50 mV/div.
Ive read this makes reading signals under 1v spotty at best.
Im not even sure what specs I need in a scope. Most of the high voltages in a crt are easy to troubleshoot without a scope..... Its all the rgb and sync level driven IC's on the board that I need to troubleshoot and alot of those are under 1Vpp so I dont want to end up with a scope thats not good for troubleshooting these areas on the chassis boards I work on.
I really just need a scope to probe the monitors chassis boards IC's to compare results against the service manual.
Theres been some buzz on this little battery powered 200kHz scope as being a good buy for checking rgb and sync levels but again, not sure of its vertical sensitivity range or if it would suffice for basic testing against the service manual of these crt monitors?
Mini Digital Oscilloscope, Leolov Oscilloscope Kit Support AUTO, PWM, One-Button Reset Button, Firmware Update, 2.5MS/s Sampling Rate, 200KHz Bandwidth, 2.4 Inch LCD Display with 10X Probe
https://a.co/d/5x428AwId love a rigol but the highest I could swing right now is around $300 on something like this siglent
Siglent Technologies SDS1202X-E 200 mhz Digital Oscilloscope 2 Channels, Grey
https://a.co/d/iJGNm8SIts claims .5mv vertical sensitivity
Im not even sure if these vertical sensitivity specs are important for what I need. I just need a cheap scope to learn on and to test/troubleshoot these old crt monitors and compare waveforms vs the ones posted in the service manual to pinpoint problem circuits in the chassis boards.
Any help is appreciated!