Re: HP 2159m Dead, no power
Issue seems to be resolved, mostly:
1. I made sure all screws were in place so grounding was properly done.
2. The ribbon cable connector on the LCD side was bent, I bent it back. It was really a bad connector. Some HP exec saved some $$$. I am attaching a picture of the connector so others may watch out for it. It is a simple slide-in thing, there is no wedge or lock of any kind, thus it is held on with a piece of tape. The tape in the pic is OEM, not mine.
Thank you all for your help....
ckgbmd
Member
Last Activity: 08-31-2014, 02:37 PM
Joined: 11-03-2012
Location: Gaithersburg, MD
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Re: HP 2159m So CLose to Fixing and Yet...
I STARTED THIS THREA... wait, caps lock, sorry.
I started this thread because no one was replying to my post on the old thread, and someone suggested I start a new one. But I got a reply, so yay.
Anyway, I followed your advice and focused on the ribbon data cable, pics (poor, sorry) below. I cleaned the ends with solvent, and it turned out that the connector on the LCD side was actually bent. I dont know the english word, but in russian we say "someone attached it by means of snot". So, this connector...Leave a comment:
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HP 2159m So CLose to Fixing and Yet...
Hi, with some help from this forum I figured out that the problem with my monitor having no power was a bad VR (U201) on the main board. I replaced it and the monitor powers up, shows menus, etc. Unfortunately, the image is now covered with tiny green flashing lines. Maybe you have run into this problem? Here are my ideas so far:
1. I did not solder the VR in well enough. It has 4 legs, and one might be in intermittent contact?
2. I did not properly connect the ribbon data cable. This is possible because the connectors are hard. On the main board, there is a friction piece that slides... -
Re: HP 2159m Dead, no power
Hello, I managed to replace the VR and now I get the correct voltage. Now the power LED started working. I put it 1/2 way back together and the monitor turns on, shows menus etc. The problem is, the image is fuzzy. tiny green dashes dart horizontaly across the screen. Has anyone run into this problem? I suspect the thin ribbon cable that connects to the flat panel, the connectors are crappy. Or maybe it was my hack soldering job? I am also currently missing a couple of the screws that held the boards in place, need to find those. Any suggestions?Leave a comment:
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Re: HP 2159m Dead, no power
Thank you all very much for the advice. I ordered several VRs (because I will probably destroy one) and also a replacement capacitor for C214 just in case. That one is a CapXon SJ 105C, 100 uF 16V. I looked up the data sheet to get the ripple current rating, and there was some confusion becuase the 6.3 x 7 mm dimension only goes to 68 uF for a 16V piece. So in the end I ordered this
[url]http://www.digikey.com/product-detail/en/UTT1C101MDD/493-3271-ND/1970522[/url]
which is a Nichicon rated for 5000 hr (excessive, maybe) and with a 163 mA...Leave a comment:
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Re: HP 2159m Dead, no power
Thanks. I am trying to figure out if I can test the capacitor C214 without removing it from the board. If it were shorted I would get low resistance across it right? I get 0.8 kOhm right now. That is probably just from some resistor in parallel with it right? It looks OK? God help me replace that VR, not so quick with a soldering iron, I was really hoping it was a cap somewhere.Leave a comment:
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Re: HP 2159m Dead, no power
MrBill, my 2 year old did that, repeatedly, but I tested the button and it seems to be working fine - when I press it, the leads are shorted.Leave a comment:
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Re: HP 2159m Dead, no power
Wow, that is a useful and serious document.
here's what I've got:
U201
MT1117
3.31002M
first lead - 0.0 V
second lead - 1.523 V
third lead - 5.269 V
U202
AX1117
A-18
943A
first lead - 0.0 V
second lead - 1.805 V
third lead - 5.081 V
The best I can tell, these are fixed VRs for 3.3 and 1.8 Volts. the first one appears to be bad? The model lettering is confusing, however, I am not sure I looked at the right...Leave a comment:
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Re: HP 2159m Dead, no power
Also, I have measured the voltage across the main cap, it is 164 V, so it seems the power supply is fine. If only I could figure out how to turn it on/off with the pin, then I could test the output voltage to the 750 V DC outs to see if those are working. But for now I guess it seems like the problem is with the main board.Leave a comment:
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Re: HP 2159m Dead, no power
Here they are. Is the voltage regulator on the main board? I thought all that stuff was on the power supply....Leave a comment:
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Re: HP 2159m Dead, no power
Thanks! My bank also offers a free check sending service so I could do that too. I will check the voltage across the big cap when I get to work tomorrow.
I am not sure how to use the pin to tun on/off? It would also be good to have some other voltages to check to make sure the PSU is working. I will probably check the button board tomorrow too, since my daughter kept messing with it, and maybe that''s how the trouble started.Leave a comment:
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Re: HP 2159m Dead, no power
Yes! Everything is exactly the same. I have not figured out if the problem is in the power supply or the other board in the monitor, however. I could definitely make you an offer for the two boards if you were able to dig them up!
I also measured the voltages again, and the only voltages I am getting on the outputs are the +5 V and the Vadj = 0.2 V. I am not reading any voltage on the high voltage outs but that might be the way its supposed to be I am not sure.Last edited by ckgbmd; 11-06-2012, 04:29 PM.Leave a comment:
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Re: HP 2159m Dead, no power
Hi, I am wondering if anyone is still checking this thread.
I have the same issue with my 2159m monitor- no power, not even power light. I wont post pics because MrBill already has them at the top of the thread. The 4A fuse seems to be fine, 0.2 Ohm. The MOSFET mentioned above is also fine, high resistances between the source/drain/gate. The bridge rectifier has high resistances (> 250 kOhm) between all four leads, so I guess its not shorted? The caps look OK.
I plug the board in and measured the power output. The are...Leave a comment:
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