Re: IQ SMART TV 22" weird problem
The TV is led not lcd so it has no backlight
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Re: IQ SMART TV 22" weird problem
This TV has an always on power supply, the ON/OFF pin that you measured 0V is the Backlight ON/OFF control pin and right now the main board is not sending the ON command to turn on the backlights.Leave a comment:
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Re: IQ SMART TV 22" weird problem
capacitance will only give you half the answers as to if the caps are good or not.
you can download an esr chart easy enough.
have you jumped the ps on with a resistor to (470 to 1k) see if the backlights and ps are all working properly? disconnect main for this.Leave a comment:
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Re: IQ SMART TV 22" weird problem
I don't have esr meter. Can I check it whith some other way? I have a meter that you put different componenet and tells you what it is (resistor,capacitor, diode etc) which measures the capacitors but I don't now if the values are good (I only understand uF , it gives me some readings like esr but I dont know the "good"values)
I had changed 3-4 capacitors but I didn't see any change in the behaviour.
When the TV came it has the thermal fuse blewed and I changed that.Leave a comment:
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Re: IQ SMART TV 22" weird problem
the 3.3v regulator is good. looks like the others get their voltage when the ps comes up.
if you have an esr meter, i would check all of the caps on the main board.
if they are ok, you might be looking at an eprom failure.Leave a comment:
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Re: IQ SMART TV 22" weird problem
all of them are 1117 B 33 632K
and all of them have 0v on all pins except the top one which has 3.3V on midle pin and 5V on right pin and 0V on left pinLeave a comment:
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Re: IQ SMART TV 22" weird problem
these are your voltage regulators.
i cant make out what the output voltage should be from the pics.
measure them from left to right. center pin is the same as the tab pin.
list what is written on the top line of each ic.Attached FilesLeave a comment:
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Re: IQ SMART TV 22" weird problem
What do you mean regulators? you mean transistors?Leave a comment:
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Re: IQ SMART TV 22" weird problem
Your not getting any change on on/off pin? Need to check voltages on main at regulatorsLeave a comment:
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Re: IQ SMART TV 22" weird problem
If I unplug the logic board I cannot power on the TV, it has no lights.
The voltages on the pins are on 12V rails 12.05V and in all other 0VLeave a comment:
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Re: IQ SMART TV 22" weird problem
With the main board disconnected what voltages do you have on pins 1-6 when you switch on?Leave a comment:
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Re: IQ SMART TV 22" weird problem
Anyone has any idea what to look/change?Leave a comment:
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Re: IQ SMART TV 22" weird problem
Ok the pins are
Descr. Standby Volt Power On Voltage
1)+12V 12.05 12.05
2)+12V 12.05 12.05
3)on/off 0.03 0.03
4)ADJ 5.03 5.03
5)GND
6)GND
I hope the pictures are clearAttached FilesLeave a comment:
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Re: IQ SMART TV 22" weird problem
Need good clear straight on pictures of back of tv with cover off and each board.
Need voltages from connector that goes from power supply board to main board. Will need pin#- PIN DESCRIPTION -Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
Format:
Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
1 - XXXXXXX - XXv - XXXv
2 - XXXXXXX - XXXv - XXXv
3 - XXXXXXX - XXXv - XXXv
4 - etc.Leave a comment:
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Re: IQ SMART TV 22" weird problem
I would carefully inspect board for bad connections. Heat or cool board to see if it will turn on.Leave a comment:
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Re: IQ SMART TV 22" weird problem
That was a good idea. I removed the con1 and solder a cable directly on board but still the same noise and cannot power on the TV altough it has the standby led when I push the on button nothing happens or just shut down the led.Last edited by rippergr; 04-04-2017, 10:12 AM.Leave a comment:
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Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
Hi there!
I have a Sony Bravia KDL-40Z4500 which shows a colored vertical stripes pattern when turning on, with a central black shadow that slowly dissipates within the first 10 seconds.
Photo of the situation after the black shadow dissipates:
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Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
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Hello, I came here after finding some similar questions asked on other monitors and hope someone here can help me get an ancient Viewsonic VP230mp (23" 4:3 LCD) back to working condition.
First a little background, I have a background in computer and electrical engineering, and I'm smart enough to know I know nothing about LCD displays and how they work. For this topic I'm as green as they come.
When the display is turned on the viewsonic logo displays in the uppper left for 2 seconds then the screen goes black, the power LED is green (on) and when a computer is connected...
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