How do you determine the chassis number of a Philips product? I can find the model number but no chassis number. All the service literature is by chassis number.

Have you looked for a stamp, tag, or other ID inside or outside of the cabinet, or on the chassis itself?

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Yes!

Always a heavy paper tag on them but they do
get lost. Will start with screen size then a letter then numbers.
Also look on CRT, layout chart & cabinet sides.
If not post a chassis pix & someone may ID it.
BTW whats wrong with it ? May be a common problem..

73 Zeno:smoke:
LFOD !

Posting the model number itself may also help with chassis identification.

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The model number is 27ps55s121 which as close as I can determine is an L04HU-AA chassis but I can't be for sure.

For $2.49 you can order the service manual here: http://schematics.tv-sm.com/Opencart/index.php?route=product/product&product_id=3260

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for the L04HU-AA but how do I know this is the right one?

Compare........ Sets evolve so even if its wrong some things
dont change fast. The thing to watch is part numbers. Start on the problem & see how it goes.

for the L04HU-AA but how do I know this is the right one?

for the L04HU-AA but how do I know this is the right one?

What? You can't risk $2.49 to find out?

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Might be a good deal, considering Staples would charge me 15 cents a page to print a 132 page PDF.