HP W2408 - no live, no reaction

**dragos2009** · 03-21-2016, 01:17 PM

Re: HP W2408 - no live, no reaction

you have more problems than the 3 burned tranzistors you also have more badly burned stuff on the psu take a look at the attachament i have circled them in red

Attached Files

**bartex** · 03-21-2016, 01:46 PM

Re: HP W2408 - no live, no reaction

Thank you for your answer!
I've seen these places. What could be the reason?
I would like to fix PSU. Next week I peak up transistor, diode bridge and
I'll check. What else should I check? Whether the cause could be the capacitor next - its capacity has decreased and sailed a higher current?
Once I heard about this case, but I do not know if it's true.

**Agent24** · 03-21-2016, 02:03 PM

Re: HP W2408 - no live, no reaction

You can add photos with "manage attachments" button - how to do that is shown here: https://www.badcaps.net/forum/showthread.php?t=1868

dragos2009 is right, the burnt area by that glue and R8xx? is bad too. You will need to cleanup and replace that resistor at least.

Also those 2 pins on CN830 board maybe damaged, you need to check them.

If the main bridge is shorted it probably blew the MOSFETs. When they blew they probably took out the controller on the daughter-board at CN830. It looks like someone tried to repair a trace to one of the IC pins but the controller itself may be blown.

I think you're going to need a schematic to fix this one, but I can't find one.

**bartex** · 03-21-2016, 02:26 PM

Re: HP W2408 - no live, no reaction

Now I know how to upload pictures

It does not look good

Exactly, scheme is not available anywhere.
As I wrote in the next week, I check these elements and write.

**Agent24** · 03-21-2016, 02:41 PM

Re: HP W2408 - no live, no reaction

If you can clean up those resistor under the glue with alcohol you maybe can read the code. You will need to clean up the soot from the board too in case of electrical leakage.

If the resistor is burnt and open circuit, and the markings are too damaged, see https://cdn.badcaps-static.com/pdfs/...69b55c45bf.pdf for ideas on how to find out what value it was.

**bartex** · 09-07-2016, 05:04 AM

Re: HP W2408 - no live, no reaction

Hi everyone. I buy new PSU. Anddddd.... it dosn't work. When i turn on i hear "boom" and i fast turn off. Here we are...
http://obrazki.elektroda.pl/4393234400_1473245665.jpg
http://obrazki.elektroda.pl/9850086500_1473245671.jpg
On the main board damaged the chip. Unfortunately, I do not know markings chip
I do not know why it happened. short-circuit was not .
if anyone knows indication of this chip ? I read only TD ( A ) ....

Regards

**bartex** · 09-07-2016, 06:41 AM

Re: HP W2408 - no live, no reaction

Ok i know it's TDA 8496L. Can I unsolder chip and turn on screen witout TDA? Why chip expolde? Ehh...

**Agent24** · 09-07-2016, 03:25 PM

Re: HP W2408 - no live, no reaction

It's just the audio amplifier chip, so probably not critical for operation. You can probably remove it and test without it.

Perhaps when the old PSU failed, it damaged the chip, now when you test with a new PSU it blew up as it was shorted from damage already?

**bartex** · 09-18-2016, 07:27 AM

Re: HP W2408 - no live, no reaction

Yes - it's audio amplifier. I remove chip - and when power is ON screen is RED GREEEN BLUE . Over and over again. No reaction to plug VGA cable or other. So i think MB is dead. I think about T-CON, but when it shows the colors rgb think it is OK?
I would buy a universal MB (google: V59) and connect. New MB costs ~40$ - it's too much. I do not know pinout's from MB and inverter.
Maybe someone knows? The supply voltage of the inverter, which is pwr_on to start PSU?

Regards

**boyebaran** · 09-21-2016, 02:39 AM

Re: HP W2408 - no live, no reaction

it gone to factory test mode.try this
1) Make sure you have video on your current input.
2) Then turn off monitor.
3) Hold down the "Menu" and " +" keys while turning OFF/ON REAR Power switch.
IF monitor does not have rear power switch (ex. w2408) then just do with front power switch.
4) Bring up OSD and scroll up/down to "F" letter at one corner of the OSD window.
5) Press Menu/select button to enter Factory menu.
6) Scroll down and turn off Burnin.
7) Scroll back up to "Exit" menu.
8) Cycle power with front power button

**boyebaran** · 09-21-2016, 02:47 AM

Re: HP W2408 - no live, no reaction

in produce line in factory you need keep warm monitor to some alignments and testing monitor for any problem.so you need signal.by pushing some key like as :menu ,+ key and............monitors gone to factory test mode.(RGB blinking).the monitor feeds own signal by this mode.by service mode you can change some alignments like as H size,vertical size ,white balance ,..........

**bartex** · 09-21-2016, 09:53 AM

Re: HP W2408 - no live, no reaction

do not know how to thank you. monitor came to life!!!!!
Thank you veeeeery much!
all the best!

**boyebaran** · 09-21-2016, 10:22 AM

Re: HP W2408 - no live, no reaction

you are welcome.good luck

HP W2408 - no live, no reaction

HP W2408 - no live, no reaction

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