Wednesday, April 25, 2018

NEC Accusync 91V Won`t Power On!



                    I found this too hard to resist as anyone who knows me will undoubtedly know I`m a full on Amiga freak. I have previously bought the two smaller monitors from this NEC family, the 71vm (17") and 51vm (15"). They are screens that support 15KHz, retro friendly,
removing the need for expensive scandoublers or internal Amiga addons to convert the resolution. In my opinion the 15" gives the best experience, however I wont digress from the 19" fella that`s landed courtesy of Hermes couriers, the Ryan Air of logistics.














                    I did contact the seller and for an agreed sum he posted the item as it was collection only on the sale. His description pointed at a faulty ON/OFF switch which didn`t put me off as I would have easily used it hard wired ON or fitted a compatible switch. So I got the back off to clean it and have a look.



First impressions were promising, no bad smells, scorch marks or signs of anything burn`t. everything surface mounted and easily viewed, how things used to be. I took a minute to google its release:





19-inch display for high-quality multimedia enjoyment and price-conscious home users


Munich, 14th January 2004 With the NEC AccuSync® LCD91VM, NEC-Mitsubishi Electronics Display-Europe is presenting what is currently the top model in its AccuSync® all-round line. The 15-, 17- and 19-inch models in this product range are distinguished by an outstanding price/performance ratio and are based on the latest state of the art in NEC-Mitsubishi LCD technology. 
               I was sold already, the Top Model in 2004, I like to think I`m price-concious. Didn`t take long to see the problem, no multimeter, no oscilloscope, nothing required but a good pair of Mr Magoos. Both caps adjacent the Heat-sink were badly swollen. Both were 1000uF 10v DC. I ordered a 5 pack from RS Components but upped the voltage and temp rating as this will give the replacements a longer lifespan. Electrolytic Capacitor uF micro farad rating must always be equal, voltage must be the same or greater than marked on the body.
Though larger voltage usually means bigger physical size so you can`t go crazy.

 This would be my first port of call before further investigation should the monitor still have problems. Nice flat tops on new caps.
                I soldered in the replacements 1000uF @ 25vdc  instead of 10vdc. Gave everything a good clean, blown with air and wiped with Isopropol alcohol wipes before a final inspection and assembly. I had a small Dell Optiplex sitting nearby that I plugged the monitor into, no stuttering green power light but a nice solid bright beacon of contentment. Sadly the new family member would have to go attic bound to join his smaller brothers in the Amiga section till further notice as space here is the front room is becoming an issue.

             Here is a link to to Youtuber  "Modern Vintage Gamer". He`s a fantastic Amiga resource and thanks to him I was made aware of the NEC Accusync 15KHz models.
            There are lots of NEC Accusync models on Ebay etc, models 93vm etc, they are not 15KHz. As I said before, I recommend the Accusync LCD51vm as the go to Amiga screen as the screen size is more like the commodore CRT Monitors of the day, games look great with little or no adjustment and colours pop. This monitor also has built in speakers which for the Amiga is a great bonus, I do prefer a soundbar though for the full on music experience!

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