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Forum 141

LG 42PX5D.

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malcscott
(@malcscott)
Posts: 1569
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Hi, a friend of mine has asked me to look at his 8 year old LG42px5d plasma tv. There is sound but no pic. Voltages to both sus boards are ok and there is a faint buzzing from the display. Led 024 on the main pcb is unlit, others are.
Any ideas? Malc.

 
Posted : 09/08/2014 10:47 am
Norman-Raeburn
(@norman-raeburn)
Posts: 174
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Hi Malc, You will probably need deep pockets to repair this, at 8 years old it is at end of life. Check that the heatsinks on the y and z sustains boards are getting warm after the set is on for a while. If the y sustain one is cold then the hybrid ic under the heatsink is probably faulty. Also check the buffer board ic's for pinholes as this is a common problem. If the z sustain heatsink is cold then again the hybrid ic will be faulty, these are available from ebay but are a pig to remove. Usually with these sets the upper buffer and y sustain boards need changed which is very expensive. Norman

 
Posted : 09/08/2014 12:31 pm
malcscott
(@malcscott)
Posts: 1569
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Hi Norman, the large sustain pcb on the left is stone cold, the one on the right is working temperature. Looks like a visit to the tip, Malc.

 
Posted : 09/08/2014 12:40 pm
Norman-Raeburn
(@norman-raeburn)
Posts: 174
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Hi Malc, If the chip is cold they are available from ebay around £30.00 but you must check the two buffers on the feft for pin holes in the chips. Norman

 
Posted : 09/08/2014 7:09 pm
malcscott
(@malcscott)
Posts: 1569
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Hi Norman, as this is the first time it has failed in over 8 years of constant use it is getting dumped. No point in spending money on a set of this age. It has done very well. I have saved the psu from it, Malc.

 
Posted : 09/08/2014 7:16 pm
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