Comments on: Just Repaired A BenQ FP731 17″ LCD Monitor

By: admin

admin — Mon, 11 Jul 2011 20:32:17 +0000

Hi Marshal,

It can be bulged cap, dry joints in the high voltage transformer or even one of the backlight have problem.

Jestine

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By: Marshal

Marshal — Mon, 11 Jul 2011 18:59:37 +0000

Hai, i have a problem in my benq lcd monitor. When ever i turn on cpu my monitor display goes off. Please help me how to troubleshoot this problem

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By: admin

admin — Sun, 17 Apr 2011 21:58:30 +0000

HI John,

Yes it is either the EEPROM or the MCU that give problem. The only way is to compare with a good and identical chip because there is no tester that can test if the chip is good or bad.

Jestine

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By: John

John — Fri, 15 Apr 2011 11:43:25 +0000

Thank you very much Jestine for the quick response.

The button has been checked and it appears functioning properly, i.e., pull down to 0V from 3.3V while being pushed. However, the pushing button signal seems not passing through the interface board to the power board MCU, by monitoring the connector pin #2 (BLT_ON) voltage, i.e., stay at 3.3V even while the PS button was depressed.

Some new development has just come up, power up the monitor while pushing down the PW button has, somehow, manage to not being able turn on the monitor, both the interface board and the power board have power on all the buses (+12V, +5V and +3.3V), but the monitor is not showing anything. The backlight can be turned on by directly apply 3.3V to the connector pin #2 at between the boards. However, depressing the PW button does not start the monitor, the BLT_ON line is not energized with 3.3V, this pointing the finger at the logic control on the interface board. It seems to be either the eeprom on the interface board is corrupted, or the control chip is out of function. So the question is how to test the interface board with simple equipment, short of swapping the board (since there isn't board on hand to swap with)

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By: admin

admin — Fri, 15 Apr 2011 11:11:09 +0000

HI john,

You mean the moment the power is applied there is good display except that the on/off is not functioning? If yes then you may need to check the button or the MCU in the mainboard have problem.

Jestine

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By: John

John — Thu, 14 Apr 2011 23:30:33 +0000

A BenQ Q7C3 (FP767Ver2)could not been turned on/off by the front push power button, otherwise, it works normal.

Please comment any possible cause, thanks.

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By: admin

admin — Thu, 29 Apr 2010 03:06:59 +0000

Nice to know you Bob!

Jestine

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By: Bob

Bob — Wed, 28 Apr 2010 23:12:11 +0000

Нi! I am from Russia. It is cool site:)

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By: RIMI

RIMI — Mon, 01 Mar 2010 01:02:06 +0000

THANKS

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By: admin

admin — Tue, 29 Dec 2009 18:33:19 +0000

Hi Jim,

It is different from other fuse but you can use fusible resistor as a replacement. Some pico fuse located along the B+ line and if it is broken then no B+ voltage will be present at the flyback thus no high voltage will be produced.

Jestine

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