Electronics Forum / Repair / October 2006

Hi Guys & Gals,
We provide contract Antenna Install and Repair services in sunny
Queensland, Australia. We are in process of completing our training
documentation/manuals and are interested in hearing from you in regards

Been fiddling with this for a bit and guess I need to post it here.
I have a PCI ATI All-In-Wonder TV-out card and the special cable that
goes with it.  That's connected to a new SANYO 24" TV from my PC
running Win '98 - using all this for MAME.

The 6.3 amp fuse was open. I replaced it with a 4.0 amp just for test
purposes. The degaussing coils happened to be unplugged at the time so
that I could get the chassis out for inspection and the set came on
fine. I then plugged the coils in and tried it. There was a loud hum

Hi;
 I've done a lot of searching and have not seen anything for this
unit.
This unit has an intermittent problem that affects the AM/ LW / SW1 /

This unit has been a major pain.... the original symptom was the sound
cutting out on both channels. It would run normally for a while and then cut
out, or sometimes it would power on with no sound (relay clicks on, final
preamp and output stages are fine). Tapping the volume up ...

It eats tapes only sometimes, usually when I stop it.  Problem is, that
it doesn't have a rubber idler or any belts.  so where should I be
looking.
I'd replace it, but I can't buy one with a digital tuner until next

Hi,  Thanks to everyone who has helped me in the past.  Now the projection TV I am working on now has the green gun driven very hard, to the point that the unit shuts down after about a minute.  I have checked all the transistors, etc and everything points to the M51387P IC.  ...

It blows fuses immediately on pluggin in.  Otherwise, it works fine.

On the power supply board, I removed Q1 and Q2.  Both appear to be
all shorted out internally.  I get about 1.2 ohms between any 2 pins

I need a transistor P/N for a Mitsubishi HS-U52, VCR.
The part in question is ( Q902 ) on the power supply board.
Any help would be geatly appreciated.
Thanks Mark

I wish to replace an old Sunvic room thermostat controlling the coa
fired central heating system. I have purchased a SUNVIC TLX 920
thermostat. The existing wires are red, yellow, blue & yellow/green
The new thermostat has 4 connection points.(ie: they are numbere

Could someone please tell me the data of the electorlit capacitors on
the battery side of the charging circuit in the shaver? One in mine is
blown up, so the shaver does not charge the battery, and the IC on the
panel is getting too hot. I can't find any service manual and/or

Just in case anyone else out there has one of these relics still working...
I replaced the white flyback with 45 degree HV output (362003-5) with an HR
equivalent for the 362003-7 after looking at the specs for it and the later
362140-1.  It looks like pins 1 and 3 were switched ...

I have a hitachi model 50ux19k Rear projection TV.When i push the power
botton the relay engages but the power light will not come on and the
tubes do not light.I have electronic repair experience on sound sys.Two
years ago the tubes were replaced professionally.Is there a watchdog

The LCD readout on my exersice machine is fading and is pressure sensitive.
The LCD itself attaches to the pc board via pressure on a silicon strip
embeded with extremely tiny conductive bits.
I cleaned all surfaces gently but the display is still weak on some

Using a PIR sensor to switch a speaker.
Please..
How do I make the speaker emit a tone?
Best regards