HAIER HLT10 No video no power won't turn on

[arman960]

I have this small lcd tv that I am working on. when I push the power button on I can see faint image but the tv won't turn on. when it is in charging mode, the power button continuously flashing. where should i start? any idea?

[RJARRRPCGP]

Re: HAIER HLT10 No video no power won't turn on

Haier=Expect inconsistent quality.

I had a bad experience with one of their window air conditioner units, seems that a moron over in the PRC made the evaporator too cold! Mine froze up like a bastard.

Bet that it can also freeze up at 70 F+!

[arman960]

Re: HAIER HLT10 No video no power won't turn on

It seems like nobody here worked on small portable lcd tv. They are hard to diagnose.

[budm]

Re: HAIER HLT10 No video no power won't turn on

It is a just a PC monitor with tuner and Video inputs.
So post good clear pictures of the board and use the attachment function in the GO ADVANCED to post the pictures then we can tell you the test points to check.
Since this unit uses wallwart adapter, have you verify that it is OK? Also remove the batteries and see if it will power up by the wallwart.

[arman960]

Re: HAIER HLT10 No video no power won't turn on

budm, input power required for the tv is 9v-12v DC, 2A.

I do not have the original power supply but I found one with 9v DC and 2A.

I the power button continuously blinks like , it is trying to charge the battery. I heard that the power button usually turns green when functional. But it is red now.

I have taken apart the tv , I will take some pics and post it here. Thanks for the reply.

[budm]

Re: HAIER HLT10 No video no power won't turn on

Did you try removing the batteries?

[arman960]

Re: HAIER HLT10 No video no power won't turn on

if I remove the battery, the unit is totally dead. There is not even red light blinking. But I see faint image with or without the battery.

The main board has lot of small 100uF 16v and 220uF capacitors on it. None of them are bulged or look bad.

[budm]

Re: HAIER HLT10 No video no power won't turn on

If you disconnect the walwart and the batteries, do you see faint image with the flash light?
If you do, then we will need to look at the backlights inverter circuits when you post the pictures.

[arman960]

Re: HAIER HLT10 No video no power won't turn on

ok with battery connected, The power LED power red and blinks on the side. Without the battery and wall charger connected, the LED power in the front stays solid and I can see faint image with flash light.

Also seems like inverter section is built in on the main board. There is only two boards in it. Main board and control/switch board.

[budm]

Re: HAIER HLT10 No video no power won't turn on

Well, I am waiting to see the pictures of the board.

[arman960]

Re: HAIER HLT10 No video no power won't turn on

Here are the pictures. Let me know if you need additional pictures.

[budm]

Re: HAIER HLT10 No video no power won't turn on

On picture #1 I can see a white plug with red and white wires which looks like it is for the backlight. Where does this plug go to on the board? I do not see typical High voltage transformer any where on the board. Can you leave that connector connected to the board and take pictures of that area. This unit may use LED backlight.

[arman960]

Re: HAIER HLT10 No video no power won't turn on

you are right. I do not see any transformer on it. I think led on this unit. But LED not working as back-light. LCD panel works though as I can see image with flash light. I will take more pictures and post it.

[budm]

Re: HAIER HLT10 No video no power won't turn on

The must be a regulating power supply close to that connector, just need take a close look in that area.
Can you measure any voltage on those two pins of the connector? They will more likely to put the White LED in series, so if one goes out, it will kill the rest.

[arman960]

Re: HAIER HLT10 No video no power won't turn on

I do not see any voltage regulator on the main board or lcd panel. All I see some IC , capacitors, resistors. Please check the board.

The LED near the power supply port lights up only when I connect the battery. Without the battery there is no light , acts like totally dead.

[heavymachines]

Re: HAIER HLT10 No video no power won't turn on

Voltage regulator circled in red...

[budm]

Re: HAIER HLT10 No video no power won't turn on

Please see the attached picture.

[heavymachines]

Re: HAIER HLT10 No video no power won't turn on

looks like i might have missed one where 2 caps are laying on top of it. just helping along not an expert.

[arman960]

Re: HAIER HLT10 No video no power won't turn on

Please see the attached picture.

Here is back and front side pictures.

[arman960]

Re: HAIER HLT10 No video no power won't turn on

The must be a regulating power supply close to that connector, just need take a close look in that area.
Can you measure any voltage on those two pins of the connector? They will more likely to put the White LED in series, so if one goes out, it will kill the rest.

More pictures of the TV