Comments on: CRT Monitor Display Shrinked At Both Sides https://jestineyong.com/crt-monitor-shrink-at-both-sides/ Semiconductors, Test Equipments, Circuit Board Troubleshooting, Electronic Repair Courses and Many More! Tue, 30 Nov 2010 12:48:10 +0000 hourly 1 https://wordpress.org/?v=5.4.19 By: admin https://jestineyong.com/crt-monitor-shrink-at-both-sides/comment-page-1/#comment-7829 Tue, 30 Nov 2010 12:48:10 +0000 https://www.jestineyong.com/?p=844#comment-7829 Hi Jojo,

Check the gate signal to the b+ fet. The pulse should have about 10 to 12 volt peak to peak when tested with scope. If you get more than that the B+ output will be increased. Trace the gate signal line to see if there is any bad component and if possible try replace the h/v oscillator ic too.

Jestine

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]]> By: Jojo https://jestineyong.com/crt-monitor-shrink-at-both-sides/comment-page-1/#comment-7828 Tue, 30 Nov 2010 06:39:06 +0000 https://www.jestineyong.com/?p=844#comment-7828 Dear Jestine sir

I am repairing SAMSUNG SYNCMASTER 594 MG,the problem is the B+

is too high after the FET IRF630, From power supply B+ is 50V,after

booster circuit it is 200V, please give me a solution.

Thank You

Jojo

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]]> By: Jestine https://jestineyong.com/crt-monitor-shrink-at-both-sides/comment-page-1/#comment-798 Thu, 08 May 2008 06:10:48 +0000 https://www.jestineyong.com/?p=844#comment-798 Hi,
Please check the gate signal from the h/v oscillator ic to the gate pin of the B+ fet. I came across before a 14" likom monitor where the B+ voltage increased to very high and shutdown the monitor. Tracing backward starting from the b+ fet gate pin lead me to a resistor value where the ohm already increased! The resistor was covered by decayed glue and making the ohm value increased. In your case, it could be a leaky transistor, cap problem or etc. Hope this helps!

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]]> By: nowdaygood https://jestineyong.com/crt-monitor-shrink-at-both-sides/comment-page-1/#comment-790 Wed, 07 May 2008 14:29:28 +0000 https://www.jestineyong.com/?p=844#comment-790 Dear jestine
I know English a little.
I read this website everyday.Excellent.
I repair Samsung monitor now.
B+ too strong.B=50v, B+ = 200v.
You help me.
Thanks you.
Have a best wish.

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