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Equipment Repairs => LCD TV forum => Topic started by: scooby-doo on December 07, 2011,11:38:32

Title: Technika LCD22DVD Backlight On Voltage
Post by: scooby-doo on December 07, 2011,11:38:32

No backlights coming on everything else working...it has a small 12v inverter (IN220402) and main board (B.LT712C) when testing "B/L ON" goes to 1.7v when tv is turned on...should this be more around the 3-5v range???

Thanks in advance

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: sparky on December 07, 2011,14:16:16

hi
if there are some 9pf caps 3 kvw can cause fault also
if one of tubes down need a ccfl tester to check
dave

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: jimca007 on December 07, 2011,16:37:01

dont know if they're still using the same psu but loads of these went down with bad caps 2 16v 1000uf if i remember correctly

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: jimca007 on December 07, 2011,16:39:48

remember to always see the whole picture before going forward see attachment

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: dougc on December 07, 2011,18:14:54

Nice one Jim.

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: scooby-doo on December 08, 2011,03:37:23

Great Video Jim....didnt expect that at the end.

As for the fault, already replaced the 16v/1000 caps also changed the 9pf caps too, still nothing... I havent got a ccfl tester. So Im buggered on that front.

Cheers for your help chaps

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: sparky on December 08, 2011,12:12:08

hi
you can make one for about a fiver from maplins
they have a inverter type  replacement for laptops
can be modified to test up to 32" ccfl tubes mentioned it
a few weeks back
think doug,and chris made one up
dave

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: Turnip on December 08, 2011,12:16:11

Hi Sparky,

Suggest remind folks not apply 12v on the 5/12v input - it doesn't like it up it - Chris.

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: bluesmoke on August 06, 2012,04:57:00

hi sorry for bringing this topic back up but i have the same set with the same fault were you able to sort it ?
thanks dave

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: sparky on August 06, 2012,06:09:35

hi
tested nearly everything in end changed inverter panel cured fault
got one from ebay

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: bluesmoke on August 06, 2012,14:35:01

hi thanks for the reply i have already changed invertor  but i havent changed the 9pf caps 3 kvw as i havnt got any suppose thats next

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: sparky on August 07, 2012,03:47:52

hi
if you changed inverter panel them caps or on there could
be screen faulty

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: Turnip on August 07, 2012,13:27:43

Hi Bluesmoke,

Have you given full model number ? - lots about, and most with additions after the LCD22DVD (the + xxx bit) that makes considerable difference - Chris.

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: bluesmoke on August 15, 2012,05:01:40

hi sorry for the late reply been so busy with kids hols!
hi turnip the full model number is
X22/14E-GB-TCDU-UK
REF LCD22-208E
PRODUCT CODE TX22J14BTCDUGO30

any help would be great thanks dave

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: Turnip on August 15, 2012,13:54:13

Hi, Bluesmoke,

Does it have Inverter- LK-IN220413 ? - you didn't say - if so, nothing yet posted - Chris.

Title: Re: Technika LCD22DVD Backlight On Voltage
Post by: bluesmoke on August 18, 2012,13:53:59

Hi turnip i have a LK-IN220417A inverter in it but i have aready swopped that and fault is still there ?