Electronics Forum / Repair / December 2007

My DVD player starts to give me problems as every cold start requires a
shutdown/restart cycle to get it working. Once it started to work,
everything works perfectly - no undetected discs, no skips, no audio/video
drops.

Hi I fixed bad convergence in Samsung HC-P4752W projection tv and I need
to know how to enter in service menu and re-adjust convergence for
red/green and blue/red.Thanks

Hi...
I recently acquired one of these, model DK-A1D. I have no idea what the D is
for, and a search of the Sharp site only turned up info on A1 & A10
models...none with a D suffix.

Just been handed back a computer that I earlier gave to friends that
were in need of one. It has a problem and I said I'd take a look at it
to see if it's something relatively easy to repair. I have never had
any reason to give a computers power supply a first look before

Using my multi-meter, is there any way to determine the voltage of a
working individual mini-bulb from a set for a Christmas tree? One set needs
2.5 v bulbs, another 3.5, another 6.
Thanks,

I have  just gotten a ths 720a  works pretty good  but i have two
questions:
The LCD  is  bad, anyone know where i can buy another replacement module?
Seems under the key membrane  is a space that looks  like a ckt bd can

Hi. Mits WD-52725 dlp set. Timer lamp blinks green continually, reseting for
a moment, when a relay clicks on PS, then usually resumes blinking, but not
always. It can settle down and then I can start it up for a short time. Have
checked PS outputs at test points with scope. All ...

I have a Sharp RPTV, model # 61R-WP5H,  61", about 6 years old.
For the past 6 months or so, it will work for random lengths of time.
Sometimes 6 hours, sometimes 3 weeks. Eventually, the image will
collapse & disappear into to bottom center of the screen, and the

Do TVs emit some sort of high frequency sound when they're turned on?
Ever since my parents got digital cable, my dad has a bad habit of
turning the cable box off but forgetting to turn the TV off. He can't
tell the TV is still on because with the cable off, the TV screen is

We have a Hastings VT-4B made by Beede Electronic Instruments Co,
Inc.  The line transformer in this unit has burned.  It's a custom
transformer, made by Regional Mfg. Specialists, part number 528214-G.
From what I can tell, it just feeds into a bridge, center tap

       Please I have a Dell Inspirer laptop from a friend with
windows Vista  home Edition. The laptop works alright on battery but
when it is connected to the the mains the screen goes off. In fact the
screen goes off after it has finished booting. it is the back light

I have two of these I'm fixing fro a friend and both have motor driver board
issues
I need schematics for a Atari 055315 driver board or would appreciate any
thoughts on where to get one

I have collected through the years many Stepping and Hobby motors
collected from CD-Rom drives, DVD-Rom Drives, audio and video
equipment, toys . All motors are tested and  I do not have a minimum
order.

I have Sears branded Beta VCR:
Sear Part Number: 564.53091450
Its basically a renamed Sanyo 4400
I replaced the belts, but it still leaves loops of tape when changing

Does anyone have Datasheet or the pinouts for an AY1-5051 Fixed Modulus
Divider chip? I can't find them on the internet. It was made by General
Instruments (later Arizona Microchip) and is a PMOS technology.
I am trying to repair a 1960's Elka organ for an 82 year old friend. He ...