Comments on: Electronic Repair Questions/Answers and Testimonials- Part 29

By: admin

admin — Sun, 25 Sep 2011 18:21:51 +0000

Hi,

Check to see if the B+ voltage is too high causing it to shutdown. It could be flyback problem:

http://www.electronicrepairguide.com/testing-flyback-transformer.html

Jestine

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By: hardwareman25

hardwareman25 — Sat, 24 Sep 2011 07:32:19 +0000

I urgently need support and troubleshooting guide on HP F2105 21'inch monitor which switches itself automatically to sleep mode in 2 minutes. It wont show anything again until you turn it off and on again.

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By: admin

admin — Thu, 03 Feb 2011 13:53:43 +0000

HI Lee,

I have no repair any of this equipment before thus i do not know what is the exact spec of the backlight. I suggest that you visit the website below to ask for more information:

https://www.jestineyong.com/?p=2543

Jestine

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By: Lee S.Lanois

Lee S.Lanois — Thu, 03 Feb 2011 06:01:18 +0000

Mr Yong, I have (2) Smart Parts SP1100W digital picture frames with failed back light. Card assembly CPWBX0043TPZZ. May be European made. Turns up on Google search as used in Panasonic 11.5" PN-119D. Panasonic says not their product. Need to know sustitute/replacement component for repair
Thanks Lee

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By: admin

admin — Mon, 04 Jan 2010 02:22:40 +0000

HI Joseph,

Happy New Year! No raster could be cause by no high voltage or even no G2 voltage. The flyback must produce high voltage in order to generate the G2 voltage of about 250 to 300 VDC.

Jestine

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By: Joseph

Joseph — Fri, 01 Jan 2010 21:47:32 +0000

Hi jestine and happy new year. what is the problem of a tv that has no rasta on the screen please ?

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By: admin

admin — Mon, 30 Mar 2009 15:12:51 +0000

Hi John,

You are welcome and thanks for sharing out your success. Have a blessed day!

Jestine

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By: John Perry

John Perry — Sun, 29 Mar 2009 03:23:28 +0000

Jestine,
HP f1903 LCD Monitor. I am referring to the post by Paul about the Foxconn 19.1823.01 Back Light board on an HP f1903 LCD monitor. My monitor went all black last night. I found a cold solder joint on the rectangular shaped capacitor between the two C57076 transistors, re-soldered it back to the board. Put the monitor back together and when I cycled the power to the monitor I was able to view the desktop screen only for a moment before it went back to black again. Upon reading the post by Paul on your web site I bent back a transistor and then noticed leakage from one C5706, looks like the loose capacitor took out that transistor. The Foxconn board appears to have twin power supplies and it will not operate with one damaged. I went to bluestar-online.com to order 4 but it was over $22.00 after minimum order price and shipping, so, I found them on eBay for $1.00 each and $4.98 shipping, used Buy It Now, THANK YOU for the information on your web site, it saved me from having to buy another monitor.
John Perry in California

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By: admin

admin — Mon, 16 Feb 2009 10:01:15 +0000

Hi Ko,
According to my data book the K2843 can be replace with K2645. Hope this helps!

Jestine

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By: ko myat moe,Myanmar

ko myat moe,Myanmar — Mon, 16 Feb 2009 02:19:01 +0000

Which transistor can be replace K2843 at 15 volt power supply 1.5Ampere

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