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PDP42V5 No picture, Sound OK. HV 'crack' when relay switches in.

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  • SteveP6 Jun 14, 2008

    The actual TV is a Hyundai HPT 4240 but inside it uses LG modules and has the LG PDP42V5 part No.
    The sound is fine but the display is blank. I have replaced the 1uF, 630V capacitors C19 & C97 on the DGK 420W PSU PCB.

    That has not fixed the problem and there is one HV 'crack' or pop when the relay drops in.

    I cannot find a circuit diagram (schematic) or handbook with test points to allow further diagnosis. Can anyone help with Tips or data?

  • Oleg139 Oct 08, 2008

    I have the same problem.
    There is sound, but no picture at all.
    All outputs from PS DGK 420W are OK.

    On the Control board (CTRL_1222_TMDS) D17 is flashing, D13 and D2 are steady lighting.
    +15V on the connector P300 is actually only about 9V unless the cable is disconnected from Y_SUS board and +15 is measured on Y-SUS.

    The heat sink on the Z-SUS board is becoming hot for fingers pretty in 5 minutes after turning power on, but it may be OK. I do not have any schematics.
    Will anybody help please?

  • 2672 Nov 28, 2008

    The tv switches on but turns off after a few seconds. The output of the rectifier on the PSU is 340VDC. This lovers to about 230VDC untill the unit then enters standby mode. Any suggestions welcome!! Thanks.

  • tom togtokh Dec 31, 2008

    Yes I have a same problem Where I can find PSAnybody khows VIZIO dealer or online ?

  • chahn99 May 11, 2010

    Hi djtomeeee,

    Did you meant capacitors inside IPM (power module soldered on the board?)

    I have pdp42v6 panel and the Y-sus is 6871qyh029A.

    Recently I replaced Z-sys and Y-drive bottom to fix no picture but sound. It shows picture and sound, but there is also some flickering noise. And Z-sus 15V point produses about 12 V.

    Can you describe the part I should replace?



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Here's what you need:
1) General guide - very similar TV, same main issues and troubleshooting process:

2) Most common repair for the pdp42V5 chassis:

Hope this helps!

Posted on Apr 15, 2013

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Replace the alu-case electroltics in the 15V-line of the Y-sus, they are connected to the inputs of the 15V regulators. I've repaired a lot of these modules. they are 33uF 25V types. I have replaced them with normal elelctrolytics in value of 47 uF/ 35V...

Best regards,

Thomas, Hungary

p.s.: Do not operate the display without these capacitors replaced because the IPM (hybride IC) on the Z-sus and Y-Sus can burn out...

Posted on Jan 22, 2009

  • marcelo0680 Sep 03, 2010

    how many 15V regulators do you have? I can see only 1


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Here's what you need:
1) General guide - very similar TV, same main issues and troubleshooting process:

2) Most common repair for the pdp42V5 chassis:

Hope this helps!

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