Re: HP LaserJet 2605DN making stripes on the paper?
Hey, the printout from the 2605DN looks faded. The picture of the monkey should have more red color in it. The laser lens need cleaning. Once cleaned it should print as good as the 2840. However the cleaning job is not easy, so not sure if its still worth it.
jh20
Member
Last Activity: 12-21-2024, 05:25 PM
Joined: 07-22-2012
Location: melbourne
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Re: Triac BT136 pin-out on PCB
Just to update that the lamp is working again after replacing the triac and the resistor. Sorry for the delays...Leave a comment:
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Re: Triac BT136 pin-out on PCB
@budm, the one I linked was rated 60w because it uses a small triac inside. There are others with higher watt but I just simply linked the first hit I had from googling. Besides we we're only using 30w Mirabella bulb so that's not a problem. The one we have is rated 150W, said so on the module cover.
@R_J, I'm going with they bought a whole bunch of triacs mfg with reversed T1 and gate...Last edited by jh20; 05-20-2019, 08:15 PM.Leave a comment:
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Re: Test relays in circuit
Or maybe easier to just simply re-solder them all anyway?...Leave a comment:
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Re: Where to buy Macbook logic board components?
If you're stocking up for repairs purposes and can wait a few weeks, and not required immediately for a current repair, Aliexpress would be the cheapest. Look for those listed under free delivery.Leave a comment:
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Re: Triac BT136 pin-out on PCB
Ya, I don't understand either. But seriously the photo with the triac still soldered on the pcb was how it was when I open it up.
FYI, the blue is the AC neutral, coupled with the inner brown wire (live) are coming from the wall plug. The outer brown going to the bulb centre contact, and the red is the return from the bulb casing contact (load as you put it?). And the yellow is going to the metal base.
If replacing the triac and resistor don't work, I'll replace the whole module. They can be had for peanuts from China:...Leave a comment:
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Re: Triac BT136 pin-out on PCB
@R_J, I was thinking maybe the original triac had a different pinout too. But I found the blown-off molding in the casing and is still in one piece, and it definitely says BT136 on the top line, 600E second line, and PN0506B4 on the third. Can't show a photo as the prints are too small and faint to be picked up by the camera.
@Agent24, that's a good one
But there's other advantages of not pushing the components all the way in.
1) much easier to remove when you need to get the tweezer underneath the lead.
2) it won't...Leave a comment:
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Re: Triac BT136 pin-out on PCB
Thanks budm. Based on the diagram I drew, with the triac the wrong way round, could it have worked at all in the first place? The lamp is at least 5 yrs old and my daughter said it's definitely been working fine before it blew last week! Weird.....Leave a comment:
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Re: Triac BT136 pin-out on PCB
Ok, 3 more photos at slightly different angles hopefully should clear things up. By the way to avoid confusion by some readers, the last diagram loaded earlier was a similar circuit I found on the internet, it is not the diagram to my circuit.
Noticed there's another mistake on the board? There's 2 C3, the 1uf 50v electrolytic cap and a small ceramic cap (C6 in the diagram you were referring to I believe) hidden behind in the earlier photo.
The MT1 (should be the gate) is currently connected to the ceramic...Leave a comment:
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Re: Triac BT136 pin-out on PCB
no, if the IC is bad I'll give up
We'll see when I get the Triac and 2W resistor in, on ordered. But before I put the Triac in, need to confirm which way the Triac should be mounted. I'll retrace the circuit again today when I have some time....Last edited by jh20; 05-18-2019, 05:17 PM.Leave a comment:
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Re: Triac BT136 pin-out on PCB
Thanks redwire. First of all, wow, how did you know the gate is near EC1? You must be very familiar with this type of circuit? You're the right man I was looking for
I've attached a few more photos for references. First one is the full view of the dimmer pcb with the Triac still on the pcb. Again you were right, the tab was facing the pcb edge. And you can see the Triac was blown.
The second photo is the back side of the pcb.
So, what was my problem? Well, look at the third photo which is a schematic I drew....Last edited by jh20; 05-18-2019, 01:43 AM.Leave a comment:
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Triac BT136 pin-out on PCB
Hi, referring to the picture in the attachment, can someone please advise which way a Triac BT136 (TO-220 package) should be mounted. Thanks.... -
Re: LG 37LC2D No picture, believe bad power supply
if you look at some of the photos posted by others, you'll find that some of those caps at the bottom roll does go bad. you can buy a repair kit for about us$15, just google for lg 37lc2d repair kit. the kit doesn't contain all the caps on the psu board but only those that normally would go bad.
edit: to be safe you probably should replace "all" the caps.Last edited by jh20; 04-26-2013, 04:33 PM.Leave a comment:
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Re: Viewsonic VX2255WMB No Backlight/screen (With video link)
hmm....that actually contradict to what i've always thought about fuse rating.
i always thought that the wattage is what counts. that is, if i were to replace a 1a 250v fuse with a 125v type, i would use a 2a so that the wattage remains the same, and vice versa. so if i will to use a 24v type i would have to use a 10a fuse at least.
am i wrong?...Leave a comment:
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Re: Chimei DAC-19M009 Power Supply problems
ok in that case maybe yours' different faults. if it's shorted it's very obvious as the pins will measure near zero ohm. i should have mentioned this earlier, it's much easier to isolate the inverter section by pulling out one leg of the glass fuse than trying to remove the ic's. try this instead to see if the clicking noise would go away.
edit: oops, i didn't scroll down my screen so i missed your last post, boss. so don't worry about this post then....
edit 2: amraks, if you still want the p605...Last edited by jh20; 03-04-2013, 03:37 PM.Leave a comment:
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Re: Chimei DAC-19M009 Power Supply problems
hey boss, any luck with your monitor yet? if you refer to my last post of this thread:
[url]https://www.badcaps.net/forum/showthread.php?t=8349&page=2[/url]
you'll see that i'd just fixed mine a few days ago. but it actually died on me the next day with the clicking noise problem!
i'd just found the problem to my psu today and thought i might share it with you incase yours is the same fault. the 2 driver fet, part number p605, which drives the inverter transformer, one of them had shorted pins...Last edited by jh20; 03-04-2013, 07:58 AM.Leave a comment:
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Re: Chimei CMV221D black screen ?
just a follow up as i decided to get to the bottom of this.
pcbonez was right! i pulled the screen apart and the top ccfl has a broken tube (pair of 2). replaced the pair with one from a lg 22" monitor that has a broken lcd and the problem seems to be fixed. monitor has been on for the last 1 hr and it's still going
unless it falls over later, otherwise consider this as fixed
...
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Re: Chimei CMV221D black screen ?
forgot to read this thread first before posting
so looks like it's the tubes problem. not to worry, i'll just bin it. it's too old and the colour quality is bad anyway.......
thanks for reading....Leave a comment:
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Re: Chimei CMV221D black screen ?
do we have a solution to the op's problem? i have the same monitor with the exact same psu board and exactly the same problem as well.
i have replaced all the capacitors on the board and it's still not fixed. the strangest thing is if you switch it off then on, it comes back for a few more seconds before going dark again. so it is definately not a hard failure issue.
have done what plainbill suggested and got exactly the same result as the op's. no image at all when off, and the voltage at the fuse are 19.1 when on and...Last edited by jh20; 02-26-2013, 09:24 PM.Leave a comment:
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Re: LG 37LC2D No picture, believe bad power supply
Wayne's Wholesale Spares, Chipping Norton, NSW. I did ask for trade price as I run an office equipment repair business....
part cost $58 + gst = $63.80
freight $15 inc gst
total $78.80
So I was wrong in saying it's less than $60
edit: This was in August 2012....Last edited by jh20; 01-09-2013, 11:36 PM.Leave a comment:
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