Hi,
maybe for some it's a trivial question, but if you know the answer, please post it here.
How to open the HP MX703 (P9605A) Monitor, without damaging it,
so we can access internal electronics for troubleshooting and service?
I just got this unit for a repair and I removed 3 screws in the base and that's it - it just won't open.
It has 4 holes on the side that look like latch holes, but trying to open it there with a screwdriver doesn't work.
Generally these Monitors have a blown horizontal output transistor and a shorted flyback transformer and is not worth repairing as the parts are no longer available. To open the set is a bit of a problem. A screw driver has to inserted into each slot and you will need to find the right size and then the back will slide off. i do not remeber the size as it has been awhile since I have seen this HP monitor.
I used a knife to push the latches in (about 2-inch each) and it worked.
There are 4 latches: right behind the holes on side of the monitor but have to push them quite deep to release. If U use soething flat (like a knife) you can feel as they spring on you.
There is one more latch on the top center of the crt housing, but it released it's hold once the other 4 were loose.
Thank you for the advice - it re-assured me that I was looking in the right areas, just been cautious as I did not want to damage the plastic housing.
Now, the fun begins...
This unit came completly dead (no power), so I'll start looking around power supply first.
Based on your experience and other articles found aroud the net, I think that blown horizontal output transistor might be a good lead.
Anybody could show me where to look for it?
I tried to follow HP service manual, but I can't find area T402, they are referring to.
U can click on images to see it bigger...
The flyback is the transformer with the heavy thick red lead that connects to the bell of the picture tube with a suction cup on the end.
Please please please be careful with this. There is over 10000V still within the tube and you can get a decent belt from it if you touch the wrong thing. The horizontal output transistor (HOT) is attached to the metal heat sink surrounding the flyback. I think that it is a 2SC5638, but look at the number on the transistor. Also, check the the immediate area for bad solder connections. Dan
Do we have to disconnect the flyback cable?
Is HOT maybe that big TOSHIBA C5386 transistor as shown on the picture?
(The most left one one the alumionum shield.)
Can I test it in-line (without removing from PCB)? On reverse side it appears to be Q433 with points B,C,E, right?
(All solder points on this picture are original factory - I didn't touch anything yet.)
You can click on pictures for close-up views...
yes that big one is the HOT. You should disconnect at least two leads from the PC board or the transistor will check a low reading between the base and the emitter.
Ya know, you can buy 17" CRT monitors these days for around $50-70 bucks. Flat screens even. I wouldn't waste my time. Except for generic transistors, resistors or caps, You can't get parts for those HP monitors.
The transistor is the 2SA5386. This should cost you about $3-$5 and is available in many places. If the flyback is toast, the transistor will fry as soon as you try it. If that happens, stop. It is not worth repairing. Dan
Thats a 2SC not a 2SA for the transistor. Sorry Dan And MOtvGUY Is correct, I bought a used 19" Monitor used for 25 bucks a few months ago. LCD 15 to 17" are under 200 bucks now.
Yep it is a 2SC, my mistake. I also agree that it is not worth it. I recycle monitors all the time and rarely repair them. Once in a while, if my supply is short, I'll replace a HOT. Anything more than that is not worth it. Feel free to edit my original post as it was a typo. Dan
Dan your a moderator, you can edit it youeself if you want my friend. Did you get a chance to send out the disc?