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cctv monitor/tv ?

Hi since this is related to security systems i thought i would opt for here.
The problem iam having is with my Haier CCTV monitor model #LT24M3.
We had to have the power off for electrical repairs but when the repairs were completed the monitor seems to have developed a fault,as follows.
When the monitor is powered up the blue led flashes for unto 10 mins before the set actually turns on,also when screen does appear it has horizontal green pin stripe lines running through the picture displayed.
I think this is linked to the fault as i have tried the set using various sources and the pic is still the same.
I have had the back off the monitor and checked for any loose cables or any burnt components but all seems fine.
That's the state of play so far,so i was wondering if anyone can give me info/advice which could lead to repairing the set myself.

Many thanks jp

John Paul
September 2013

Haier Security Systems, Home Alarm Systems

you crawler you,!:-)

gts
September 2013

True what you say gts,but you defo not lazy mate,its just that I have lots of free time now I've retired to tinker with things I've never understood,or had the time to learn about before.

I know all there is to know about CRT monitors etc but these new flat screen jobbies are something else,but I'm learning lol.

My next daft investment is in a SMT reflow oven,that should bode well with her indoors :D.

e manno
September 2013

brill e manno I just don't think its worth the time to repair these things when you can buy a new monitor for around £60.-70 from cpc but hope the guy gets it sorted with your good advice ,spending time with a scope finding faults not for me any more mate (maby am getting lazy ) :-)

gts
September 2013

Forgot to add,looking at the board again, I'd also replace the Ams 117 voltage regulator too for good measure.

Don't forget to check the voltage rails and adjust accordingly.

The test locations and voltages are clearly marked on the board,use the chassis for the ground probe if you meter/fluke is ideal,or by new board from the site I mentioned below,around 30 quid ain't bad.

Let us know how you get on because it can help others with same issue.

Good luck and be safe.

e manno
September 2013

They are cheap gts but on that model the psu looses the 5v rail due to the caps drying up,it's one fault documented in the service manual.

Vestal psu's used in most brands are well known for their poor JH caps,and are easy to test with meter or scope only three lines of power.

Main or x'y sustain faults are mostly ic driver and fet's related problems or buffers and in most cases it's better to change the board out because I agree with you about the domino affect.

But saying that mate most sets these days have over voltage/short protection circuits that shuts the sets down,so none of the other boards are damaged.

A psu or main board are only about 30 quid each for this chaps monitor,so it's a cost effective repair but he will have to set the voltages to the correct specs,but it's voltage potentiometers and voltage for the rails are clearly marked on the board.

I use this site because I buy big screen panels from eBay and repair them,nowt to do now at my age plus it keeps me occupied :).

http://www.lcdtvparts.co.uk/index.php

e manno
September 2013

brill e manno,i don't bother fixing monitors any more coz there cheap these days,also something causes the caps to blow,and you can spend lots of time tracing faults replacing components just to find your buggered anyway,but u gave guy good advice :-)

gts
September 2013

I can give you link for good rubycon caps if you prefer to replace the caps.

Don't usually give repair tips for LCD or plasma on here due to the dangerous voltages that the caps on the sets can discharge.

Best leave the set powered off for a day before you remove the board.

Be safe.

e manno
September 2013

================================================================================
MODEL: LT24M3 (Haier/Bush)
--------------------------------------------------------------------------------
FAULT: Completely dead, no power LED
Power LED flickers
Powers on when cold
Backlight flickers when power first applied
--------------------------------------------------------------------------------
DIAGNOSIS: Check for good 5V standby
Check 3.3V regulator on main board (should measure 3.3V out)
--------------------------------------------------------------------------------
FIX: Replace 3.3V regulator
================================================================================

================================================================================
MODEL: IDLCDTV37TV016HD and related IDLCDTV chassis
--------------------------------------------------------------------------------
FAULT: Stuck in standby
Takes 10-20 minutes to start up
Blue LED on front flickers
Graphical corruption on power up (lines on screen, etc.)
--------------------------------------------------------------------------------
DIAGNOSIS: Check for good 5V standby
--------------------------------------------------------------------------------
FIX: Suspect 2200uF 10V and 1000uF 35V caps
Replace the suspect capacitors even if not bulged
================================================================================
So in short you have vestal psu with duff JH caps,if you need link for new psu or main board let me know.

e manno
September 2013

your monitor is fried mate but since you can buy a new one from cpc very cheap not worth fixing,google farnell electronics are you using a multi plexer ???

gts
September 2013