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NO PICTURE BUT SOUND ,42 HAIER TV

Can anybody help me my 42"haier plasma tv went out on me i get sound but no picture , i have no warranty cause it just ran out,I think it the lamp, i look at same problem on this site with other haier 42" products, and some gurus
say that this tv has two power sources one for the audio and one for the picture , another guru says part tv-3940-01 is needed which is a upgrade kit that 3 boards -a control board-y and two x sustain boards , but what does that upgrade the tv to. please help me with this

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  • tberry26 Oct 16, 2008

    THANK U FOR THE INFO!

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No picture sound ok
Note 1 a Raster is the name for a screen made of lines of brightness
Note 2, A Blank raster has no snow or picture, its just a lit up screen

Sound ok but no raster.
First increase tube's first anode voltage (knob on the loptx) to see if the screen is just too dark.
if after you have turned up the bottom knob on the loptx, there is still no brightness,check, for crt heaters, and EHT 25kv and focus voltage (2kv) and A1's/Screen/G2 voltage is 300-600v.
and check for field timebase (height), the next thing to check is the sandcastle pulse.
If it's present, colour decoder chip is probably faulty or lacks supply from the LT regulators.

NO LINE DRIVE If it's absent,check the line driver, locate the loptr(big and usually has heat sink).
follow the print from the base back to the driver stage , where you will usually find a tiny transformer with 4/5 pins
resolder it, even if it looks good,then with power on, check for voltage on all its pins, 2 should have LT(12v to 32v) or HT (90v to 150v), if not there follow the print back and look for either a transistor(linedrivetr), or the feed voltage line (maybe regulated),
If the voltage is ok on two of the driver transformer(drvtx) legs, the look from the base of the driver transistor to locate the timebase chip
and check round its pins for a 12v supply line, if there ,replace the timebase generator chip

Method of testing line drive, remove line output transistor, and connect a normal red led, across the B/E (longest leg to base), and when you power up the led should lite up.


Trace the pcb back from the BASE leg to find the line driver stage,
Its usually a very small transformer (4/5 legs) and a transistor connected to it,
The driver transformer legs(pins) will be two with voltage and two without
The two with power will either be about HT level (110v=145v) or about LT level(25v)
If not then trace back and look for a biggish 3w resistor.

Hope this may help you;

Regards,
VOTIT

Posted on Oct 16, 2008

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Its not an upgrade. its a replacement for know failures.
I have had to go into stores that were selling the device and fix them before they sold them
but of course they did sell them before I or I'm sure other tech's cold fix them.
so really that is the repair if it comes with new wirestrips to connect the boards.

but if it is the plasma screen, thats not good.
it will need to be tested to determine if there is power and video output to the plasma screen

Posted on Oct 16, 2008

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  • jason Oct 16, 2008

    I'm sorry thought I was on anther thread!

  • jason Oct 16, 2008

    OK why is a plasma under projection tv?

  • jason Oct 16, 2008

    those chip boards that are on the back of the plasma heat up from use and the plasma screens heat causing them to fail from (thermal breakdown)(heat)

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Hi, I can understand that its 42" TV. But what is the model number?
:)

Posted on Oct 16, 2008

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If there's a sound, there could only be a broken component inside the circuity board. Normally, its just a bulged capacitor. Visually check the circuit board of your TV for any possible burned components like transistor, resistors and IC. If you can't do it by yourself, it would be better to have it checked by a pro TV technician or Electronic repair center near you. It only cost around 50$ for possible part replacement.

Posted on Oct 16, 2008

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  • 306 Answers

You need an upgrade kit part: TV-3940-01.. But the part is backordered for three months. $150.00

Posted on Oct 16, 2008

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